Material selection decision
Titanium Grade 5, commonly identified as Ti-6Al-4V, can support strength-to-weight and corrosion-driven designs, but exact condition, stock, machining, heat, surface and evidence determine the finished component. MakeNexa reviews project-matched supplier routes; aerospace, medical or other regulated suitability is never inferred from the grade name or a representative image.
Selection criteria
Start with the fixed mechanical, mass, temperature, fatigue, corrosion and compatibility requirements. Compare Grade 5 with the broader titanium and alternative-material options using approved design data for the exact condition and product form. Bar, plate, billet, forging and additively produced stock can create different property, grain, allowance, documentation and inspection questions. State whether Ti-6Al-4V is mandated or whether engineering may propose a reviewed alternative.
Machining requires a route that manages heat, tool engagement, workholding, thin features, spring, burrs and surface damage. Define final radii, thin walls, holes, threads, fatigue-sensitive edges, contamination controls and post-processing. Identify material certifications, lot linkage, special-process records and inspection only where required by the project. MakeNexa does not claim a regulated qualification, achieved property or universal lead time before supplier and evidence review.
Where the material fits
Material capability and routing depend on exact condition, stock and final feature requirements.
Define the loads, stiffness, fatigue, temperature and mass objective using approved data and safety factors for the application. A general strength-to-weight description does not approve the part or replace engineering analysis.
State product form, condition, heat-treatment state, grain or forging requirements and acceptable material sources. Link the required material evidence to the finished lot when traceability matters.
Five-axis or multi-setup machining may fit contoured surfaces and angled features, but access, rigidity, tool reach, thin walls and datum transfer still control the route. Mark critical relationships and protected surfaces.
Define roughness, burrs, sharp or blended edges, blasting, coating, passivation-like cleaning or other surface steps. Fatigue- or contact-sensitive features need explicit processing and inspection boundaries.
Material tradeoffs
High material value and difficult geometry increase the cost of late requirements and undocumented assumptions.
Properties and process behavior depend on product form and condition. Cite the complete material requirement and any permitted variants rather than accepting a shortened alloy label as the full definition.
Low stiffness, long reach and localized heat can change deflection, chatter, surface and residual stress. Identify final thickness, free-state inspection and any stabilization or sequence constraint.
Tool marks, smeared material, embedded contamination and edge damage may affect critical surfaces even after blasting or coating. Define the pre-finish condition and required inspection before it becomes concealed.
A Grade 5 material record does not establish aerospace, medical or other approval. Specify the governing requirements, supplier qualifications, process records, validation and publication permission for the actual project.
Grade and route choices
A useful alternative protects fixed performance while returning the validation consequences clearly.
Use compatible bar, plate, billet or forging when controlled subtractive geometry and evidence fit. Include stock allowance, setup, heat, burr, surface, material records and final inspection in the quote.
A forging, casting or additive preform may reduce removal for selected geometry, but changes tooling, properties, allowance, surface, post-processing and qualification. Treat it as a separate validated route.
Another titanium grade, stainless steel, aluminum or other material may better balance temperature, stiffness, cost, corrosion or supply. Compare exact requirements and revalidate the complete design before substitution.
Material comparison
Typical published values for Ti-6Al-4V in the annealed condition. Actual values vary with product form, section size and the supplier's material certification, and the project requirement is confirmed on the reviewed quote rather than from this table.
| Property or decision factor | Typical published value | Routing consequence |
|---|---|---|
| Tensile yield strength | About 880 MPa / 128 ksi annealed | Roughly three times 6061-T6 at 276 MPa / 40 ksi, and above most stainless grades |
| Ultimate tensile strength | About 950 MPa / 138 ksi annealed | Margin against peak load in the released condition |
| Modulus of elasticity | 114 GPa / 16.5 Msi | Well below steel at 200 GPa — a titanium part deflects roughly twice as much as a steel one of the same section |
| Density | 4.43 g/cm³ | About 44% lighter than steel at 7.85 and 64% heavier than aluminium at 2.70 |
| Hardness | About 334 HB, roughly 36 HRC | Hard enough that tool life, not material removal rate, sets the cycle |
| Elongation at break | About 14% annealed | Limited forming; this is a machined and fabricated alloy |
| Thermal conductivity | About 6.7 W per metre-kelvin, against 167 for 6061 aluminium | Heat stays in the cutting zone instead of leaving in the chip — the core machining problem |
| Typical cutting speed | Commonly 30 to 60 m/min against 300 m/min and above for aluminium | Cycle times and price are set by this, not by part complexity alone |
| Corrosion resistance | Excellent in seawater, chlorides and most oxidising acids through a self-repairing oxide film | One of the few alloys that outperforms 316 in chlorides |
| Chip handling | Fine chips and dust are reactive and can ignite; flood coolant and controlled chip handling are standard practice | A supplier-capability question, not a design one |
| Thermal expansion | About 8.6 µm per metre per °C, roughly half of 304 stainless at 17.3 | Better dimensional stability across temperature than steel or aluminium |
| Common specifications | ASTM B348 for bar and billet, ASTM B265 for sheet and plate, AMS 4928 where a programme requires it | Which specification the mill certificate must reference |
| Titanium Grade 2 | About 275 MPa / 40 ksi yield at 4.51 g/cm³ — commercially pure, formable and weldable | Where corrosion rather than strength governs |
| Stainless 17-4 PH | 760 MPa / 110 ksi yield in Condition A at 7.75 g/cm³ | Comparable strength at far lower cost, if the mass budget allows |
Material RFQ inputs
Provide condition, geometry and evidence context so the route is not inferred from the alloy label alone.
Complete packages move faster: revision-matched CAD, critical dimensions, quantity and material notes are enough to open engineering review across the network.
Get a QuoteSubmit the controlled model, drawing, revision and application requirements
State Ti-6Al-4V grade specification, condition, product form and permitted alternatives
Define load, fatigue, temperature, corrosion, mass and regulated-context constraints
Mark thin walls, deep features, threads, datums, distortion-sensitive and fatigue-sensitive edges
Specify heat treatment, surface, cleaning, finish, protected zones and packaging
List quantities, material records, lot linkage, inspection, tests and special-process documents
Questions before routing
These answers prepare the request; the reviewed quote controls project-specific commitments.
Yes — Grade 5 is the ASTM designation for the Ti-6Al-4V alloy, about 6% aluminium and 4% vanadium. It accounts for the majority of titanium used in engineered parts, publishing roughly 880 MPa / 128 ksi yield at 4.43 g/cm³. The name alone still does not define the purchase: state the condition, product form and the specification the certificate must reference, such as ASTM B348 or AMS 4928.
Yes, and the reason is thermal, not mechanical. Titanium conducts heat at about 6.7 W per metre-kelvin against 167 for aluminium, so the heat generated at the cutting edge stays there instead of leaving in the chip. Cutting speeds are commonly 30 to 60 m/min against 300 and above for aluminium, tool life is short, and rigid workholding matters because the alloy's 114 GPa modulus lets thin sections deflect under cutting load. Expect the cycle time and the price to reflect that.
No, and this surprises people. Grade 5 publishes about 114 GPa modulus against 200 GPa for steel, so a titanium part of the same section deflects roughly twice as much. What titanium wins on is strength for its weight: 880 MPa / 128 ksi yield at 4.43 g/cm³ against 7.85 for steel. If the design is deflection-limited rather than strength-limited, substituting titanium for steel makes it worse unless the section grows.
No. A material callout is not a qualification. Grade, condition, product form, specification such as ASTM B348 or AMS 4928, traceability, process controls, inspection and any programme-specific approval are separate requirements that have to be stated in the RFQ and confirmed on the reviewed quote.
Yes, though the routes differ from aluminium. Titanium anodising is used for colour and for improved galling resistance rather than for corrosion protection — the natural oxide already resists seawater and chlorides better than 316 stainless. Passivation, bead blasting, polishing and specific coatings are all specified operations with their own acceptance criteria. State which surfaces are treated, which are masked, and whether dimensions apply before or after.
Next step
Send the material requirement with geometry and use context. MakeNexa routes capable suppliers from a global network covering competitor-class process categories, then returns a prepared quote or focused clarification for your revision.
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