Ti6Al4V Grade 5 vs Grade 23 ELI: Which Titanium to Spec for Australian Medical and Aerospace Projects

One-Minute Read

The only real difference between the two grades in a ti6al4v grade 23 vs grade 5 choice is the cap on how much oxygen the alloy can contain. Grade 5 (Ti6Al4V, or Ti64 on most engineering drawings) is capped at 0.20% oxygen. Grade 23 ELI (Ti6Al4V ELI, or Ti64 ELI) is capped at 0.13%. That smaller window is the whole reason Grade 23 ELI qualifies as the implantable grade for medical grade titanium 3D printing, and Grade 5 doesn’t.

• Implant-class medical device heading to TGA/ARTG → specify Grade 23 ELI under ISO 5832-3, ASTM F136 (wrought) or ASTM F3001 (3D printed). Check whether your supplier keeps Grade 23 titanium in Australia or has to source it in for your job.
• Standard aerospace bracket, airframe part or non-cryogenic flight hardware → Grade 5 is usually all the part needs, under AMS 4928 or your prime’s equivalent material spec.
• Dental framework, surgical instrument or non-implant medical hardware → Grade 5 does the job and saves money.
• Cryogenic or fracture-critical part → Grade 23 ELI. Grade 5 turns brittle below roughly −150°C.

Printed Ti6Al4V in either grade still needs stress relief, usually hot isostatic pressing (HIP), and a qualified powder lot before it meets the standards above. Picking the right grade on the quote is the start of the compliance package, not the finish line.

Introduction

Most Australian 3D printing quotes for titanium parts come back with just “titanium” on them, or “Ti6Al4V” (often shortened to Ti64 on drawings), and nothing more. For an aerospace bracket, that’s usually fine. For an implantable device heading onto the Australian Register of Therapeutic Goods, it’s the kind of detail you can’t afford to leave undecided.

The ti6al4v grade 23 vs grade 5 decision, sometimes written as Ti64 vs Ti64 ELI on engineering drawings, carries two real risks. Spec Grade 23 ELI where Grade 5 would do, and you pay a premium for mechanical properties the part will never need. Spec Grade 5 for an implantable device or a fracture-critical aerospace part, and the work fails against ISO 5832-3 and ASTM F136 before anyone gets near a quality review. The titanium aerospace vs medical grade split is almost always the first thing to lock down before the rest of the specification falls into place.

This article is written for three groups: biomedical device engineers specifying for TGA-regulated projects where medical grade titanium 3D printing is in play, aerospace design engineers working under AMS 4928 or a prime contractor’s own material specification, and dental lab procurement teams balancing cost against performance. What follows is the side-by-side chemistry, the standards map, a scenario-based decision guide, the Australian regulatory picture, the cost reality in AUD, and the questions to ask any Australian supplier about Grade 23 titanium in Australia (or offshore sourcing) before you accept a quote.

DMLS vs SLM: The Key Differences in Metal 3D Printing

What actually makes Grade 23 ELI a different alloy from Grade 5

The difference between Ti6Al4V Grade 5 and Grade 23 ELI is a tighter cap on the interstitial elements in the ELI grade (oxygen, iron, nitrogen and carbon), with everything else about the alloy essentially unchanged. Grade 5 sits under ASTM F1472 for wrought material and ASTM F2924 for powder bed fusion; Grade 23 ELI sits under ASTM F136 for wrought and ASTM F3001 for powder bed fusion. The two grades also carry separate UNS designations: R56400 for Grade 5 and R56401 for Grade 23 ELI. The base composition is the same across both grades (6% aluminium, 4% vanadium, balance titanium), but a ti6al4v grade 23 vs grade 5 choice is still a decision between two formally distinct alloys.

The interstitial element cap: oxygen at 0.13% max vs 0.20% max

The oxygen limit in Ti6Al4V ELI is 0.13% by weight maximum, against 0.20% maximum for Grade 5, as specified in ASTM F136 and ASTM F1472 respectively. That is roughly a 35% lower oxygen content ceiling for the ELI grade, and it is the single number that decides most of the engineering difference between the two.

Interstitial elements in titanium (oxygen, nitrogen, carbon and iron) sit in the gaps of the metal lattice. Higher interstitial content increases static strength slightly, but it reduces ductility and fracture toughness more significantly. Lower interstitial content is what makes Grade 23 ELI behave the way implants need: tougher, more ductile, more forgiving under years of cyclic loading in the body.

Iron drops too, from 0.30% max in Grade 5 to 0.25% max in Grade 23 ELI, also as specified in ASTM F1472 and F136. Nitrogen and carbon limits stay the same in both grades: 0.05% N max and 0.08% C max.

Picking Ti6Al4V ELI over Grade 5 isn’t about choosing a different alloy. It’s about buying a tighter chemistry window on the same alloy.

What “ELI” means and why it exists

ELI stands for Extra Low Interstitials. The term describes a Ti6Al4V chemistry where oxygen, nitrogen, carbon, iron and hydrogen caps are all set lower than in standard Grade 5, with no change to the aluminium and vanadium content.

The two grades exist because they were developed for different industries. Aerospace needed high strength at low weight for airframes and structural parts, and that became Grade 5. Medical device engineers needed the same alloy with higher ductility and fracture toughness, so implants could survive millions of loading cycles in the body without fatigue failure. The fix was to tighten the interstitial envelope while keeping the base chemistry constant. That became Grade 23 ELI, written on material certificates as Ti6Al4V ELI.

ISO 5832-3, the international surgical implant standard for Ti-6Al-4V, has required ELI chemistry since publication. ASTM F136 is the US-side standard that aligns to it.

ELI isn’t marketing. It’s a chemistry-level commitment to the fracture toughness and ductility an implant depends on.

The chemistry at a glance

Chemistry limits for Ti6Al4V Grade 5 and Grade 23 ELI per ASTM F1472, F136, F2924 and F3001. Figures in weight percent.

The two columns look almost identical until you reach the oxygen, iron and hydrogen rows. Those three caps are what let Grade 23 ELI meet implant standards like ASTM F136 and ISO 5832-3, and why Grade 5 cannot be substituted into an implant specification even though it shares the Ti-6Al-4V name and most of the other numbers. For a specification writer handling a ti6al4v grade 23 vs grade 5 decision, the safest route is to cite the standard the part has to meet rather than the chemistry alone. The standard pulls the correct chemistry window with it, and the material certificate from the supplier traces back to the same reference.

How Ti6Al4V Grade 5 and Grade 23 ELI actually perform

The most common misread of ti6al4v grade 23 vs grade 5 is that Grade 23 ELI is a weaker Grade 5. It isn’t. Grade 5 is stronger; Grade 23 ELI is tougher. In the annealed condition, Grade 5 carries slightly higher static strength (UTS and yield), while Grade 23 ELI delivers materially better fracture toughness, ductility and fatigue performance. Those three properties decide implant longevity, cryogenic survival and fatigue-critical safety margins, which is why a grade 5 vs grade 23 titanium decision should start with the failure mode you are designing against, not the top-line UTS number on a datasheet.

The three H3s below work through this in the order a specifier needs it: the static strength table in the annealed condition, the fracture toughness and fatigue story that justifies the ELI premium, and what shifts between the as-built, stress-relieved and HIP conditions when the titanium is 3D printed rather than wrought.

Static strength: tensile, yield and elongation (annealed)

The figures below are taken in the annealed condition, per ASTM F1472 and F136 for wrought material and ASTM F2924 and F3001 for powder bed fusion.

Static mechanical property comparison for Ti6Al4V Grade 5 and Grade 23 ELI in the annealed condition, per ASTM F1472, F136, F2924 and F3001.

In practice, ti6al4v grade 23 vs grade 5 on static strength alone is close to a wash. Grade 5 carries roughly 4% higher UTS and yield on paper (a 35 MPa gap on tensile, 33 MPa on yield), which for most non-fracture-critical structural parts sits well inside the design safety factor and reads as engineering noise rather than a selection driver. The density, modulus and elongation numbers are identical because the base chemistry is identical. The differences that actually drive a grade 5 vs grade 23 titanium choice don’t live in this table. They live in fracture toughness, fatigue and low-temperature ductility, which is where the next H3 picks up. If your part is specified against Ti6Al4V ELI chemistry, that spec was almost never written for an extra 35 MPa of UTS.

Toughness, ductility and fatigue: the real reason Grade 23 ELI exists

Grade 23 ELI is tougher than Grade 5 because its lower oxygen and iron caps produce measurably better fracture toughness, higher ductility at low temperature, and better high-cycle fatigue performance. Those three properties are what any implant or cryogenic specification pays for.

• Fracture toughness ti6al4v eli beats Grade 5 because lower interstitial content resists crack propagation. For an implant that sees millions of loading cycles over decades, a tougher alloy fails gracefully and tolerates small manufacturing flaws that would otherwise seed a crack.
• Grade 5 becomes brittle below approximately −150°C. Grade 23 ELI holds usable ductility into cryogenic temperatures, which is why it is specified for LNG tanks, LH2 vessels and satellite structures. Any cryogenic titanium 3D printing project defaults to Grade 23 ELI.
• Fatigue strength ti6al4v in the ELI grade typically outperforms Grade 5 at the same stress amplitude in high-cycle testing, provided the AM part has been correctly HIP-treated and heat-treated. Peer-reviewed research in Additive Manufacturing and Materials & Design confirms the pattern.

Fracture toughness is what keeps a titanium hip implant alive through twenty years of walking. Static strength gets the part through installation; toughness gets it through a career.

For any part whose dominant failure mode is fatigue, fracture or low-temperature embrittlement, Grade 23 ELI is the technically correct choice, regardless of whether a regulator demands it.

3D printed vs wrought: what changes in the as-built and HIP conditions

3D printed Ti6Al4V in either grade typically needs stress relief, heat treatment and often HIP (hot isostatic pressing) to meet the mechanical property acceptance tables in ASTM F2924 (Grade 5) and ASTM F3001 (Grade 23 ELI). In the HIP condition, AM parts can meet or exceed wrought properties for the same grade in most metrics.

Without HIP, as-built AM parts carry three issues that pull them below the wrought baseline. First, anisotropy: mechanical properties vary with build direction, and the Z-axis is typically the weakest. Second, residual stress left behind by the layer-by-layer thermal cycle, which stress relief addresses. Third, small internal pores that reduce fatigue life and fracture toughness. Published research on laser powder bed fusion Ti6Al4V has documented all three effects consistently.

HIP closes internal porosity at high pressure and temperature, restores fatigue performance to wrought-equivalent levels, and partly reduces anisotropy. Heat treatment after HIP then dials the alloy into the microstructural condition the specification calls for.

On a quote that claims medical-grade Ti6Al4V output, the first line item to check is HIP. A 3D printed Ti-6Al-4V ELI part intended for an implant almost always needs HIP as part of the quote. If HIP isn’t there, the part isn’t meeting ASTM F3001, regardless of which grade of powder went into the machine.

The standards that force your grade choice

In regulated projects, the applicable standard determines the grade; the grade does not determine the standard. Engineers often reverse that sequence when they specify Ti6Al4V grade-first, which is why this section is structured the other way around.

Six standards cover Ti6Al4V across the medical and aerospace applications this article is written for:

• ASTM F1472: wrought Grade 5 (Ti6Al4V) for surgical implant applications.
• ASTM F136: wrought Grade 23 ELI (Ti6Al4V ELI) for surgical implant applications. Often searched as astm f136 titanium 3d printing, even though F136 itself is a wrought reference.
• ASTM F2924: additive manufactured Ti6Al4V Grade 5, powder bed fusion.
• ASTM F3001: additive manufactured Ti6Al4V Grade 23 ELI, powder bed fusion.
• ISO 5832-3: international wrought Ti-6Al-4V surgical implant standard, referenced across iso 5832-3 titanium australia compliance frameworks and most other medical device regulators worldwide.
• AMS 4928: Ti-6Al-4V bar, wire and forging in the annealed condition for aerospace, which shows up in ams 4928 titanium 3d printing searches when engineers map public standards to AM aerospace parts.
  

  Read More: Metal 3D Printing in Aerospace: Reducing Weight Without Compromising Strength

Implant standards: ASTM F136, ASTM F3001, ISO 5832-3

An implantable medical device made from Ti-6Al-4V must meet ISO 5832-3 (international), ASTM F136 (wrought, US) or ASTM F3001 (additive manufactured, US). All three require ELI chemistry. Grade 5 does not meet any of them.

• ASTM F136: wrought Ti-6Al-4V ELI for surgical implants. The baseline standard against which the ELI alloy was defined, often searched as astm f136 titanium 3d printing even when the part is 3D printed.
• ASTM F3001: additive manufactured Ti-6Al-4V ELI, powder bed fusion. The AM companion to F136, and the correct reference for any ti-6al-4v eli 3d printing project destined for implantation.
• ISO 5832-3: international wrought surgical implant standard for Ti-6Al-4V. Referenced by the TGA, the EU MDR and most other medical device regulators worldwide. Entry point for iso 5832-3 titanium australia compliance work.

If the device will be listed on the ARTG as a Class IIb or Class III implant, the material specification must cite one or more of these three standards. There is no Grade 5 route.

Aerospace standards: AMS 4928 and the Grade 5 default

For most aerospace structural and non-fracture-critical applications, Ti6Al4V Grade 5 to an AMS specification is the industry default. AMS 4928 covers bar, wire and forging in the annealed condition, with equivalent AMS specs for sheet, plate, extrusions and AM forms. That is the context many engineers mean when they search ams 4928 titanium 3d printing.

Grade 23 ELI shows up in aerospace for a smaller set of applications: fracture-critical parts, fatigue-critical components like landing gear and rotor hubs, and cryogenic hardware like satellite propellant tanks and cryo structures. These usually specify ELI chemistry under customer-specific aerospace material specifications rather than a public AMS alone. The titanium aerospace vs medical grade framing gets interesting here: medical uses ELI for biology, aerospace uses ELI for fracture physics.

The aerospace AM standards landscape is still consolidating. Many primes write internal AM material specifications on top of ASTM F2924 (Grade 5 AM) or ASTM F3001 (Grade 23 ELI AM); any aerospace AM part should be built to the prime’s specification rather than just the ASTM baseline.

For an Australian aerospace project outside flight-critical hardware, Grade 5 to AMS is almost always the right call, and most 3d printed titanium aerospace australia work sits in this category. For flight-critical Grade 23 ELI work, the material specification comes from the airframer or a tiered supplier, not from a public standard list.

The AM-specific standards layer: ASTM F2924 and F3001

3D printed Ti6Al4V falls under ASTM F2924 (Grade 5 powder bed fusion) and ASTM F3001 (Grade 23 ELI powder bed fusion), not the wrought standards ASTM F136 or F1472, even when the printed chemistry matches wrought. AM introduces process-specific requirements wrought standards don’t cover: powder quality, build chemistry verification, mechanical property acceptance tables, and process documentation.

ASTM F2924 and ASTM F3001 require four things wrought standards don’t: powder handling and reuse controls, inert gas atmosphere verification, witness coupons printed alongside the part for mechanical testing, and post-processing (stress relief, HIP, heat treatment) tied to the acceptance criteria.

The compliance mapping:

• 3D printed Grade 5 aerospace part → ASTM F2924, plus the aerospace prime’s internal specification.
• 3D printed Grade 23 ELI implant → ASTM F3001, plus ISO 5832-3 as the parent international standard.

Quotes citing F136 for a 3D printed part land often enough that the first question on any ti-6al-4v eli 3d printing project should be which AM standard the output is being qualified against. Engineers searching astm f136 titanium 3d printing for a printed implant are almost always looking for F3001 instead. On a printed part, F136 is a specification error; F3001 is the correct reference.

Standards cross-reference at a glance:

• Grade 5, wrought → ASTM F1472 (implant) / AMS 4928 (aerospace)
• Grade 23 ELI, wrought → ASTM F136 / ISO 5832-3
• Grade 5 AM PBF → ASTM F2924 | Grade 23 ELI AM PBF → ASTM F3001

When to spec Grade 5 vs when to spec Grade 23 ELI: the decision, scenario by scenario

On a ti6al4v grade 23 vs grade 5 call, Grade 5 is the right choice for most aerospace, structural, dental framework, surgical instrument and prototype work. Grade 23 ELI is non-negotiable for long-term implantable medical devices, cryogenic parts and fracture-critical aerospace components.

Ti6Al4V grade selection by scenario, with the governing standard reference. Confirm against the device or part’s own specification package before specifying.

This matrix is a scenario starting point, not a substitute for the project’s own specification package.

On most Australian supplier calls, this question comes down to two tests: does the part go into a human body, and does it go into a cryogenic or fracture-critical flight application? If yes to either, Grade 23 ELI. If no to both, Grade 5.

When Grade 5 is the right call for your project

Grade 5 is the right call for parts where static strength is the primary mechanical demand and no regulated standard forces ELI chemistry.

The scenarios where Grade 5 is the correct and cost-effective choice:

• Aerospace structural brackets, airframe components and non-flight-critical fixtures, where AMS 4928 or an equivalent aerospace material specification is the compliance reference. Most 3d printed titanium aerospace australia work sits here.
• Dental frameworks, abutments and prosthetic hardware where ISO 5832-3 does not apply (verify per device classification).
• Surgical instruments and non-implantable medical hardware (trial components, drill guides, tooling, fixtures).
• Prototype work for any part that will later be requalified at the production grade.
• Cost-sensitive high-strength industrial parts where fracture toughness is not the governing failure mode.

On aerospace bracket quotes, Grade 23 ELI is the most common overspecification; the right call in those scenarios is almost always Grade 5 to AMS 4928.

For most Australian engineers specifying a Ti6Al4V part that is not going into a body and not into a fracture-critical or cryogenic flight application, Grade 5 is the correct and cost-effective call. Choosing Grade 23 ELI in these cases is overspecification: money paid for mechanical properties the part never uses. The titanium aerospace vs medical grade split is the quick cross-check, and a ti6al4v grade 23 vs grade 5 decision in this zone almost always lands on Grade 5.

When Grade 23 ELI is non-negotiable

Grade 23 ELI is non-negotiable for any long-term implantable medical device, cryogenic component, or fracture- or fatigue-critical aerospace part where the material specification cites ISO 5832-3, ASTM F136, ASTM F3001, or an aerospace customer specification that mandates ELI chemistry. Grade 5 cannot substitute into any of these without failing compliance.

• Orthopaedic implants (hip, knee, spinal cages, trauma plates and screws): ISO 5832-3, ASTM F136 (wrought) or ASTM F3001 (AM). Most medical grade titanium 3D printing projects in Australia land here.
• Osseointegrated dental implants (the component implanted into bone, not frameworks or abutments mounted on it): ISO 5832-3 and ASTM F136 or ASTM F3001.
• Cranial and maxillofacial implants: ISO 5832-3 and ASTM F136 or ASTM F3001.
• Cardiovascular implants that actually use Ti6Al4V ELI rather than nitinol, stainless or cobalt-chrome [VERIFY per device class before publication].
• Cryogenic aerospace and ground equipment components rated below approximately −150°C, where Grade 23 ELI’s retained low-temperature ductility is the functional requirement.
• Fatigue- or fracture-critical aerospace parts where the airframer or prime contractor’s material specification mandates ELI chemistry.

Downspecifying to Grade 5 in any of these scenarios is not a cost saving. It is a compliance failure. The part will fail inspection against ISO 5832-3 or ASTM F136/F3001, fail qualification at design review, or fail in service once loaded. On grade 23 titanium Australia procurement, the iso 5832-3 titanium australia reference is what the TGA, the device sponsor and QA all check first, and the astm f136 titanium 3d printing specification trail must be traceable from the material certificate back to the powder lot. There is no downspec here that doesn’t fail.

The decision matrix: scenario, grade, standard

Short reference block. Screenshot it, paste it into a design brief, or share the section link with procurement.

Ti6Al4V grade selection by scenario, with the governing standard reference. Confirm against the device or part’s own specification package before specifying.

This matrix is a scenario starting point, not a substitute for the project’s own specification package. For aerospace projects under a prime contractor’s material specification and for medical devices going through TGA/ARTG inclusion, the device or airframer specification always wins over this matrix.

The TGA and ARTG pathway: where titanium grade sits in the Australian medical device process

In Australia, implantable medical devices made from Ti6Al4V are regulated by the Therapeutic Goods Administration (TGA) under the Therapeutic Goods Act 1989 and the Therapeutic Goods (Medical Devices) Regulations 2002. The material specification (including the grade, the governing standard and the process documentation) forms part of the technical file that supports Australian Register of Therapeutic Goods (ARTG) inclusion.

This is the Australian regulatory orientation that global material-supplier content does not cover. The three H3s below walk through where the ti6al4v grade 23 vs grade 5 decision sits inside the TGA conformity assessment process for titanium implants in Australia, what documentation a biomedical device engineer actually needs from a 3D printing supplier to support an ARTG submission, and how the material documentation burden scales between Class IIb and Class III devices.

Where titanium grade sits in the TGA conformity assessment process

For an implantable Ti6Al4V device going through TGA conformity assessment for ARTG inclusion, the material grade and its governing standard (ISO 5832-3, ASTM F136, or ASTM F3001 for AM) form part of the device’s technical file under the Essential Principles set by the Therapeutic Goods (Medical Devices) Regulations 2002.

The device sponsor has to show three things: the material meets a recognised implant standard; the manufacturing process (including laser PBF 3D printing) is controlled and validated to produce material conforming to that standard; and the finished device meets the biocompatibility, mechanical and performance requirements for its classification.

Responsibility splits between two parties. The device sponsor owns the technical file and the ARTG submission. The 3D printing supplier contributes the material certificate for the powder lot, powder lot traceability through the build, process documentation for the laser PBF parameters, witness coupon test results against the applicable acceptance table, and any applicable quality management certifications (ISO 9001, and ISO 13485 if held).

On tga titanium implants australia projects, the right grade on the quote is the start of the compliance package, not the end. For any grade 23 titanium australia procurement destined for an implant, the supplier has to produce the documentation chain that connects the printed part back to iso 5832-3 titanium australia and its ASTM counterparts through every post-processing step.

What a biomedical engineer needs from a 3D printing supplier for an ARTG-destined implant

For an implantable device destined for ARTG inclusion, the biomedical engineer needs the following items from the 3D printing supplier before the material and the process can support the technical file.

1. Material certificate for the powder lot used, traceable to the powder supplier’s specification and quoted against the applicable standard (ISO 5832-3, ASTM F136 for wrought reference, ASTM F3001 for AM).
2. Powder lot traceability through the build: which lot went into which part, retained with the batch records.
3. Process documentation for the laser PBF build parameters, inert gas control, and layer-level quality data.
4. Post-processing records: stress relief cycle, HIP cycle (if applied), heat treatment cycle, and the standard each is run against.
5. Witness coupon test results, printed in the same build as the part and mechanically tested to the acceptance table of the applicable standard (ASTM F3001 or ASTM F2924).
6. Dimensional inspection report against the device drawing, with critical features called out.
7. Quality management certifications: ISO 9001, and ISO 13485 if applicable, confirmed in writing.

For any medical grade titanium 3D printing project in the grade 23 titanium Australia space, if any of these items can’t be produced by the supplier, the part is not a candidate for use in an ARTG-destined implantable device, regardless of which grade of powder went into the machine. This seven-item list is the starting point for tga titanium implants australia procurement.

Class IIb vs Class III: how the material documentation burden scales

Australian implantable medical devices made from Ti6Al4V typically fall under TGA Class IIb or Class III, and the depth of material and manufacturing documentation required scales with the risk classification.

Class IIb covers devices with a medium-to-high risk level, including most orthopaedic implants: hips, knees, spinal cages, trauma plates and screws. The material specification demands ISO 5832-3, ASTM F136 or ASTM F3001 compliance and the technical file described in the previous H3. Conformity assessment typically involves a notified body or a TGA conformity assessment certificate covering the device sponsor’s quality management system.

Class III covers devices with the highest risk level under the TGA framework, including active implantable devices and some cardiovascular hardware. Material and manufacturing documentation requirements are the most stringent of the implantable classes. Full design examination certificates and extensive clinical evidence may apply on top of the material specification package.

For any Ti6Al4V implant project, the classification determines the paperwork. The material grade (Grade 23 ELI) and its governing standard are the starting point of a stack that gets taller as the classification rises. On tga titanium implants australia procurement, the grade 23 titanium Australia material certificate is the first document on the stack, not the last; the taller the classification, the deeper the stack behind it.

Aerospace specification reality: AMS, prime material specs, and when Grade 5 is adequate

In aerospace, the Ti6Al4V grade choice is usually a decision between a public AMS specification (Grade 5 default) and a customer material specification written by the airframer or prime contractor, which can mandate Grade 23 ELI or an AM-specific requirement layered on top of the ASTM baseline.

This H2 is the aerospace counterpart to the TGA/ARTG section above. The three H3s below work through the aerospace standards layer in the order a specifier meets it: what AMS covers for 3D printed Ti6Al4V; the customer material specifications that sit on top of the ASTM baseline and often decide the grade for the engineer; and the AS9100 and NADCAP supplier qualification stack that determines which Australian metal AM bureau can actually produce the part. For most 3d printed titanium aerospace australia projects, this third layer is what shortlists the vendor list, not the grade choice. On a titanium aerospace vs medical grade call, the aerospace side comes down to the interplay between these three layers.

AMS specifications: what they cover for 3D printed Ti6Al4V

SAE AMS (Aerospace Material Specifications) covers wrought Ti6Al4V across several product forms, with AMS 4928 the common reference for annealed bar, wire and forging.

• For 3D printed Ti6Al4V, the AMS family is still consolidating; many aerospace primes reference ASTM F2924 (Grade 5 powder bed fusion) or ASTM F3001 (Grade 23 ELI powder bed fusion) as the baseline, then layer their own internal material and process requirements on top.
• A wrought Ti6Al4V part, AMS defines chemistry, mechanical properties, heat treatment condition and product form against a single document the aerospace supply chain reads from.
• For a 3D printed Ti6Al4V part, AMS does not fully define the AM-specific process requirements: powder reuse controls, layer-level quality data, build atmosphere, witness coupons and the HIP cycle. Those gaps are filled by ASTM F2924 and ASTM F3001 at the baseline, and by the airframer’s internal specification on top.

For most non-flight-critical aerospace work in Grade 5, AMS 4928 or its AM-pathway equivalent is what Australian aerospace project managers specify. On a titanium aerospace vs medical grade call, the aerospace side almost always points here. Engineers searching ams 4928 titanium 3d printing for a 3D printed part are usually mapping AMS onto an ASTM F2924 scope plus a prime’s internal spec; most 3d printed titanium aerospace australia projects sit in this envelope.

Customer material specifications: why primes write their own

For AM aerospace parts, the ASTM baseline (F2924 for Grade 5, F3001 for Grade 23 ELI) is a floor, not a ceiling. Aerospace primes and tiered contractors write their own customer material specifications on top. Those internal specs tighten process controls, mandate witness-coupon testing, and sometimes require Grade 23 ELI where the ASTM baseline alone would not.

The reasoning is commercial. Airframers carry long-term warranty, insurance and certification responsibility for every flight part. Their specs encode decades of fleet-service experience, failure analysis and risk tolerance an off-the-shelf standard cannot carry. ASTM is the shared language; the prime’s specification is the actual contract.

For the Australian engineer, the consequence is clear. If a Ti6Al4V part is destined for a named airframe programme, the grade is not yours to pick; it is written into the prime’s spec. On a ti6al4v grade 23 vs grade 5 call for a programme part, the answer is already in documentation. For a tier-two assembly or ground-support equipment, Grade 5 to AMS is usually right. On a titanium aerospace vs medical grade decision, the two industries diverge: medical reads TGA; aerospace reads the prime’s spec.

The most common aerospace brief that lands without a prime spec is a research or university prototype, and those are usually Grade 5 under ASTM F2924 for budget reasons.

NADCAP, AS9100 and qualified process streams: what Australian aerospace supply looks like

Aerospace supply chains routinely require AS9100 quality management certification, and for specific processes (heat treatment, hot isostatic pressing, non-destructive testing, chemical processing) NADCAP accreditation. A Ti6Al4V 3D printing supplier working on a regulated aerospace part needs to be running within an AS9100 quality system, with any outsourced special processes going through NADCAP-accredited partners.

AS9100 is the aerospace-specific extension of ISO 9001; NADCAP is a separate program that accredits specific manufacturing processes against industry-written standards. One covers the supplier’s quality system. The other covers whether a specific process stream (HIP, heat treatment, NDT) meets the aerospace industry’s shared bar. The two work together.

Not every Australian metal AM bureau holds AS9100, and not every one has NADCAP-accredited partners for every post-processing step a Ti6Al4V part might need. For a research-grade or non-flight aerospace part, a bureau without those certifications may still be perfectly adequate. For a flight-certified part, the certifications are not optional, and the supplier and its heat-treatment, HIP and NDT partners need to be confirmed in writing.

Before shortlisting for a 3d printed titanium aerospace australia project, confirm the certification requirement from the prime’s spec package, then shortlist suppliers against it. On a titanium aerospace vs medical grade procurement call, Grade 5 vs Grade 23 ELI is one line in the picture; the AS9100 and NADCAP layer is the other.

Australian supply reality: what’s stocked, what’s quoted, what’s shipped

Ti6Al4V Grade 5 is stocked and run by most Australian metal AM bureaus; Ti6Al4V Grade 23 ELI is stocked by fewer suppliers and typically carries a longer lead time and a higher AUD cost per part. For the grade 23 titanium australia buyer, the reasons are mechanical, not commercial: Grade 23 ELI powder costs more, handles tighter (stricter oxygen, nitrogen and iron control), and almost always runs with a heavier post-processing stack (stress relief, HIP, heat treatment, dimensional inspection, documentation package). The three sections below cover what Australian bureaus actually stock, what Grade 5 versus Grade 23 ELI really costs in AUD, and whether offshore supply is a realistic alternative for a 3d printed titanium aerospace australia or 3d printed titanium implants australia project.

In the Australian market I regularly see Grade 5 shortlists close within a week and Grade 23 ELI shortlists take two to three, because the powder lot, witness coupons and documentation path have to be confirmed against standard before a build is accepted.

What Australian metal AM bureaus typically stock

Most Australian metal AM bureaus that offer titanium printing stock Ti6Al4V Grade 5 as a standard inventory item; ti6al4v eli (Grade 23) is stocked by a narrower set of suppliers, usually those positioning toward medical device and fatigue-critical aerospace work.

The reasoning is practical. Grade 5 covers the majority of industrial, non-implant medical, dental framework, surgical instrument and aerospace prototype work; demand is steady and powder shelf life is manageable. Grade 23 ELI, the grade 23 titanium australia market, carries a higher powder cost and tighter handling (lower interstitial pickup tolerance, stricter atmosphere control, conservative powder reuse limits), so bureaus that stock it have usually committed to the medical or fatigue-critical segment. Stocking Grade 23 ELI is a positioning choice, not a casual add-on.

When a supplier does not stock Grade 23 ELI locally, powder is typically imported to order against a specific project. That adds lead time (powder lot sourcing, acceptance testing, batch documentation) and often a minimum order quantity, because the bureau is taking on a full powder lot for one job. For a 3d printed titanium implants australia project with a single prototype build, imported-to-order can mean paying for a lot the project will not consume.

Ask every shortlisted supplier whether they stock the grade you need or will source it, and what the lead-time implication is.

Metal 3D Printing Materials: Properties and Uses of 5 Common Metals

Cost in AUD: powder premium, HIP cost, qualified lot

Ti6Al4V Grade 23 ELI typically carries a higher total AUD cost than Grade 5 for an equivalent part, driven by three factors: powder cost premium, more frequent post-processing (HIP, heat treatment), and documentation overhead when a qualified powder lot is required.

Powder premium. Grade 23 ELI powder sits at a premium over Grade 5 for the same particle size and supplier, generally in the 10–20% band. On a ti6al4v grade 5 3d printing cost australia versus ti6al4v grade 23 cost australia quote, this is what buyers notice first and overweight; it is rarely the biggest line.

Post-processing load. Grade 23 ELI parts for implant or fatigue-critical use typically go through stress relief, HIP, heat treatment and dimensional inspection, where a non-implant Grade 5 part may need only stress relief and bead-blast. The stack is easily a larger cost line than the material difference.

Qualified lot and documentation. When the part must meet ASTM F3001 or ISO 5832-3, the supplier incurs cost on powder lot acceptance testing, witness coupon testing, batch records, and the documentation package. For medical grade titanium 3d printing against a standard, that cost lands on the quote.

The Grade 5 vs Grade 23 ELI quote delta is rarely just a powder price difference; it is a stacked cost picture. For grade 23 titanium australia buyers, the documentation line often moves most. Walk each component through with the supplier rather than treating the headline figure as the full story.

See our metal 3D printing quote cost breakdown for the full framework.

Local Australian supply vs offshore: how titanium is different

For Ti6Al4V in either grade, the offshore cost advantage that shows up on headline numbers for generic stainless is substantially thinner. Titanium is dense, so freight per dollar of part is higher; inert-gas handling is stricter and offshore platforms document it variably; and the revision loop runs longer when powder lot acceptance testing has to be redone.

Freight and GST. The ATO applies GST at 10% on the full landed value of imported goods including freight and insurance. For a Ti6Al4V ELI part with HIP on the quote, the landed-cost gap closes fast.

Powder lot continuity. A grade 23 titanium australia project that goes offshore often loses continuity on which powder lot parts came from across revisions. For a regulated 3d printed titanium implants australia project, lot continuity is not optional.

Lead time compounding. A Grade 23 ELI revision loop with an offshore supplier typically runs longer than the generic-stainless case because witness coupons, dimensional inspection and documentation flow back with the parts.

For a mature, revision-free, non-regulated Grade 5 production run, offshore can still win on total cost. For a regulated Grade 23 ELI project or iteration-heavy aerospace prototype, local Australian supply typically wins on calendar time and total cost. On a titanium aerospace vs medical grade call, both sides tilt local once revisions and documentation are counted.

See the metal 3D printing quote cost breakdown article for the local-versus-offshore framework.

The supplier checklist: what to ask before accepting a titanium quote

A Ti6Al4V quote should answer questions across three groups: the material specification (grade and standard), the manufacturing process (powder, build, post-processing), and the documentation package (certificates, test results, traceability). If a quote cannot answer all three, it is not comparable to a quote that can. The three checklists below sit in those groups. They are deliberately titanium-specific; for the ten general questions that apply to any metal 3D printing quote,

See our metal 3D printing quote cost breakdown article.

Grade and standard: the material-specification questions

The first group of questions nails down exactly which alloy, which grade, and which standard the quote is being priced against. On a ti6al4v grade 23 vs grade 5 quote, this is where most ambiguity hides.

1. Confirm the alloy and grade in writing: Ti6Al4V Grade 5 (UNS R56400) or ti6al4v eli Grade 23 (UNS R56401).
2. Confirm the standard the material is quoted against: ASTM F1472, F136, F2924, F3001, ISO 5832-3, or AMS 4928 (or the aerospace prime’s customer specification, where one applies).
3. Confirm the condition specified: as-built, annealed, stress-relieved, HIP-treated, or heat-treated to a named cycle.
4. For a grade 23 titanium australia or astm f136 titanium 3d printing quote, confirm the powder chemistry shows oxygen at or below 0.13% and iron at or below 0.25%, per ASTM F136 and F3001.
5. Ask whether the quote prices a single powder lot or consumes across lots if the order exceeds one lot’s capacity. For regulated iso 5832-3 titanium australia projects, lot continuity is not optional.

Process and post-processing: how the part is actually made

The second group of questions covers how the part is built and what happens between the build plate and the finished part. For a ti-6al-4v eli 3d printing quote, this group is where hidden cost and compliance gaps live.

1. Confirm the AM process: laser powder bed fusion (DMLS or SLM, also called selective laser melting titanium australia) is the industry default for Ti6Al4V; electron beam PBF is an alternative. If a different process is quoted, confirm the grade and standard still apply.
2. Confirm inert gas control: Ti6Al4V builds require an argon (or equivalent inert) atmosphere to prevent oxygen pickup that can push the material outside the grade’s chemistry window.
3. Confirm stress relief: every Ti6Al4V AM part should be stress-relieved on the build plate before support removal.
4. Confirm HIP: for Grade 23 ELI implant parts and fatigue-critical Grade 5 aerospace parts, HIP is standard. Ask whether it runs in-house or through a partner, and confirm the HIP cycle (temperature, pressure, time) meets the applicable standard.
5. Confirm heat treatment: solution treatment and ageing (or the equivalent cycle for the condition specified) should be named explicitly, not left as “post-processed” on the quote.

Documentation: what you need handed over with the parts

The third group of questions covers what documentation arrives with the finished part; without it, the part is not evidence for the technical file or the aerospace spec package. On a medical grade titanium 3d printing or 3d printed titanium aerospace australia order, the paper is the proof.

1. Material certificate: powder chemistry per the applicable standard (ASTM F136, F3001, F1472, F2924 or AMS 4928), traceable to powder lot and supplier.
2. Powder lot traceability through the build: which lot went into which part, retained with the batch record.
3. Witness coupon test results: coupons printed in the same build as the part, tested to the mechanical property acceptance table of the applicable standard.
4. Dimensional inspection report: against the drawing, with critical features called out and tolerance results noted.
5. Post-processing records: stress relief, HIP and heat treatment cycles run, with time-temperature-pressure logs where applicable.
6. The supplier’s quality management certifications: ISO 9001, ISO 13485 for medical, AS9100 for aerospace; confirmed in writing and current to date. For a grade 23 titanium australia quote destined for the ARTG or an aerospace prime’s shortlist, this certificate pack is the part of the quote that decides whether the parts can be used.

Frequently asked questions

What is the difference between Ti6Al4V Grade 5 and Grade 23 ELI?

Both are the same base Ti-6Al-4V alloy; the difference is chemistry caps, not composition. Grade 5 (UNS R56400) allows up to 0.20% oxygen; Grade 23 ELI (UNS R56401) caps oxygen at 0.13% and tightens iron, nitrogen, carbon and hydrogen alongside. The lower interstitial content gives Grade 23 ELI better fracture toughness, ductility and fatigue. Grade 5 is the industrial and aerospace default (ASTM F1472 wrought, ASTM F2924 AM PBF); Grade 23 ELI is the implantable medical grade (ASTM F136, ASTM F3001, ISO 5832-3).

What does ELI mean in titanium?

ELI stands for Extra Low Interstitials. It means the oxygen, iron, nitrogen and carbon caps in the alloy are lower than standard Grade 5. The lower caps give better fracture toughness, ductility and fatigue performance, which is why ELI chemistry is required by ISO 5832-3 for surgical implants and specified by ASTM F136 and ASTM F3001 for wrought and AM implantable titanium.

Is Ti6Al4V medical grade?

Partly. Ti6Al4V Grade 23 ELI is the implantable medical grade, specified by ISO 5832-3 and ASTM F136 for wrought and ASTM F3001 for AM powder bed fusion. Ti6Al4V Grade 5 is used for surgical instruments, trial components, surgical guides and non-implant hardware, but its standard oxygen and iron caps sit above ISO 5832-3 limits, so it does not meet the chemistry requirements for long-term implantable devices.

Can Grade 5 titanium be used for implants?

For long-term implantable devices regulated under ISO 5832-3, no: Grade 5’s chemistry caps fail the ELI oxygen and iron limits. Surgical instruments, trial components, drill guides and some non-implant surgical hardware, yes. For any device going through TGA ARTG inclusion as an implant (Class IIb or Class III), Ti6Al4V Grade 23 ELI is the correct and compliant choice.

Why is Grade 23 ELI used for medical implants and not Grade 5?

The lower interstitial content in Grade 23 ELI produces better fracture toughness, ductility and fatigue performance than Grade 5. An implant sees millions of loading cycles over years in the body; those three properties are the ones that matter under cyclic physiological load. ISO 5832-3 and ASTM F136 require the ELI chemistry for this reason. ASTM F3001 carries the same chemistry requirement across to additive-manufactured implantable titanium.

What titanium grade is used for 3D printing aerospace parts?

Ti6Al4V Grade 5 is the default for most aerospace structural parts, typically quoted under AMS 4928 or the airframe prime’s customer material specification. Grade 23 ELI is used where the part is fracture-critical, fatigue-critical or cryogenic. ASTM F2924 is the AM-specific baseline for Grade 5 powder bed fusion; ASTM F3001 covers Grade 23 ELI AM PBF.

What ASTM standard applies to 3D printed implant-grade titanium?

ASTM F3001 (Standard Specification for Additive Manufactured Ti-6Al-4V ELI Powder Bed Fusion) is the AM-specific standard. It sits alongside ASTM F136 (wrought ELI) and ISO 5832-3 (international implant standard). Citing ASTM F136 alone for a 3D printed part is a specification error: F136 governs wrought material, and an AM part’s additional process controls (powder reuse, build atmosphere, witness coupons, HIP cycle) are covered by ASTM F3001.

Does Grade 5 titanium meet ISO 5832-3?

No. ISO 5832-3 specifies the ELI chemistry (lower oxygen and iron caps, among others) for surgical implant titanium. Standard Grade 5 chemistry allows oxygen up to 0.20% and iron up to 0.40%, which fails the ISO 5832-3 limits of 0.13% oxygen and 0.25% iron. The compliant grade for ISO 5832-3 is Ti6Al4V Grade 23 ELI.

Is 3D printed Ti6Al4V as strong as wrought Ti6Al4V?

With correct post-processing (stress relief, HIP and heat treatment to the applicable standard), AM Ti6Al4V in either grade can meet or exceed wrought mechanical properties on most metrics in the ASTM F2924, F3001, F136 and F1472 acceptance tables. As-built AM parts without HIP carry build anisotropy and residual porosity and routinely underperform wrought in fatigue. The quote should name whether HIP and heat treatment are included.

Does 3D printed titanium need HIP?

For implantable Grade 23 ELI parts and fatigue-critical Grade 5 aerospace parts, HIP is standard practice and often required by the applicable standard or the aerospace prime’s customer material specification. For non-critical industrial parts, HIP may be optional. The quote should name whether HIP is included, whether it runs in-house or through a partner, and whether the HIP cycle meets the applicable standard.

How much does Ti6Al4V 3D printing cost in Australia?

No single figure applies across a project. Ti6Al4V Grade 23 ELI typically carries a 10–20% powder premium over Grade 5 for the same particle size, plus additional post-processing cost (HIP, heat treatment, documentation) when the part is destined for an implant or fatigue-critical use. For a scoped AUD quote against a specific grade, standard and post-processing stack, upload the CAD file with the project specification and intended application.

Where can I 3D print Ti6Al4V ELI in Australia?

Fewer Australian metal AM bureaus stock Grade 23 ELI than Grade 5. Suppliers positioned toward medical device and fatigue-critical aerospace work are more likely to hold it as standard inventory; others source to order against a specific project, which adds lead time (powder lot acceptance testing, batch documentation) and often a minimum order quantity. Ask every shortlisted supplier whether they stock the grade or source to order, and what the lead-time implication is on your project calendar.

Request a confidential titanium quote with MDS

If you are specifying Ti6Al4V for an Australian medical grade titanium 3d printing, 3d printed titanium aerospace australia or dental project and need a quote with the material grade, standard reference and documentation package visible on every line, upload the CAD file and project notes to our quote page. Grade 23 titanium australia requests route through the same path.

Scoped quotes come back within one business day for titanium: material certificate scope, post-processing stations and QC package itemised against the project, not buried in a single headline figure.