Titanium Ti-12Mo-6Zr-2Fe HW-A
Heat-treated state
UNS R58120 · ASTM F1813
HW-A = hot worked and annealed
Mill condition for forging stock and large-section bar before final solution treatment.
Values for the HW-A condition
Other Ti-12Mo-6Zr-2Fe tempers and conditions
Ti-12Mo-6Zr-2Fe is listed in 4 conditions; see the grade overview at Ti-12Mo-6Zr-2Fe.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
HW-AThis page Hot worked and annealed | Mill condition for forging stock and large-section bar before final solution treatment. | 930 | 1,000 | 20 | 30 HRC | 1.3 % IACS |
STDefault Solution annealed | Standard supply condition for implant bar and forgings: lowest modulus, best ductility and cold formability. | 990 | 1,060 | 19 | 32 HRC | — |
Cold worked | For wire, small-diameter bar and spring-type components where cold-work strengthening is used instead of ageing. | 1,120 | 1,180 | 10 | 36 HRC | 1.3 % IACS |
Solution treated and aged | Pick when higher strength and wear resistance are needed and reduced ductility/modulus benefit is acceptable. | 1,180 | 1,250 | 9 | 39 HRC | — |
What is Ti-12Mo-6Zr-2Fe HW-A?
Ti-12Mo-6Zr-2Fe HW-A is Ti-12Mo-6Zr-2Fe heat treated to HW-A — mill condition for forging stock and large-section bar before final solution treatment. Ti-12Mo-6Zr-2Fe HW-A has a yield strength of 930 MPa (135 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 86% of titanium grades. Elongation at break is 20% and the elastic modulus is 79 GPa (11.5 Msi). Ti-12Mo-6Zr-2Fe HW-A has a density of 5 g/cm³ (0.181 lb/in³), heavier than 99% of titanium grades. It melts at 1,620°C (2,948 °F). ST is the default condition FabDigit quotes; HW-A is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 80/100, better than 98% of titanium grades
- High strength — 930 MPa (135 ksi), better than 86% of titanium grades
Limitations
- Limited service temperature — 250°C (482 °F), worse than 99% of titanium grades
- Low stiffness — 79 GPa (11.5 Msi), worse than 98% of titanium grades
- Poor heat conductor — 6.8 W/m·K (3.93 BTU/hr·ft·°F), worse than 86% of titanium grades
- Difficult to weld — 60/100, worse than 83% of titanium grades
Ti-12Mo-6Zr-2Fe HW-A properties
Typical room-temperature values for Ti-12Mo-6Zr-2Fe HW-A; 22 are specific to this condition. Other listed values are Ti-12Mo-6Zr-2Fe reference data and may not represent this condition. Bars are the position among titanium grades.
Physical3
Ti-12Mo-6Zr-2Fe HW-A has a density of 5 g/cm³ (0.181 lb/in³), heavier than 99% of titanium grades. It melts at 1,620°C (2,948 °F).
Mechanical14
Ti-12Mo-6Zr-2Fe HW-A has a yield strength of 930 MPa (135 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 86% of titanium grades. Elongation at break is 20% and the elastic modulus is 79 GPa (11.5 Msi).
Thermal5
Ti-12Mo-6Zr-2Fe HW-A is rated for continuous service to 250°C (482 °F). It conducts heat at 6.8 W/m·K (3.93 BTU/hr·ft·°F), worse than 86% of titanium grades. Thermal expansion is 9 µm/m·K (5 µin/in·°F).
Electrical2
Ti-12Mo-6Zr-2Fe HW-A has an electrical resistivity of 1.3×10⁻⁶ Ω·m.
Chemical & Environmental3
Corrosion resistance is excellent (93/100), better than 72% of titanium grades.
Sustainability4
Producing a kilogram of Ti-12Mo-6Zr-2Fe HW-A takes about 660 MJ of energy and emits 42 kg of CO₂ — less than 57% of titanium grades. Typical recycled content is 10%.
Manufacturability8
Ti-12Mo-6Zr-2Fe HW-A's machinability is poor (16/100, worse than 93% of titanium grades); weldability good (60/100); formability good (65/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Ti-12Mo-6Zr-2Fe HW-A
Is Ti-12Mo-6Zr-2Fe easy to machine?
Very low speed (15–25 m/min carbide), heavy positive rake, rigid setup and flood high-pressure coolant; work-hardens and gums like other beta-Ti alloys.
Can Ti-12Mo-6Zr-2Fe be welded?
GTAW/plasma/EBW in high-purity argon or vacuum with full back purge; keep interstitials low and re-solution treat afterwards to restore ductility.
Can Ti-12Mo-6Zr-2Fe be formed, bent or molded?
Cold formable in the solution-treated condition (bending, drawing, wire coiling); hot work above the beta transus (~740–760 °C) then water quench.
What surface finishes work on Ti-12Mo-6Zr-2Fe?
Passivate per ASTM F86; electropolish or mirror-polish bearing/implant surfaces; anodic oxide colouring for marking, no hard-coat anodize.
Ti-12Mo-6Zr-2Fe chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Mobeta stabilizer | 10 – 13 | 12 |
| Zrsolid-solution strengthener | 5 – 7 | 6 |
| Festrong beta stabilizer | 1.5 – 2.5 | 2 |
| Ointerstitial strengthener, controlled range | 0.08 – 0.28 | 0.15 |
| N | ≤ 0.05 | — |
| C | ≤ 0.05 | — |
| H | ≤ 0.02 | — |
| Others (each)residuals total 0.40 max | ≤ 0.1 | — |
| Ti | balance | — |
Ti-12Mo-6Zr-2Fe HW-A — frequently asked
What is Ti-12Mo-6Zr-2Fe HW-A used for?
Ti-12Mo-6Zr-2Fe HW-A is typically used for orthopedic implants, spinal fixation devices and hip stems. In short: low-modulus implant titanium; aluminum- and vanadium-free; reduced stress shielding.
What is the yield strength of Ti-12Mo-6Zr-2Fe HW-A?
Ti-12Mo-6Zr-2Fe HW-A has a typical yield strength of 930 MPa (135 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 86% of titanium grades. Strength varies by condition: see the 4 listed tempers.
Is Ti-12Mo-6Zr-2Fe HW-A easy to machine?
Not especially — machinability is rated poor (16/100, worse than 93% of titanium grades). Very low speed (15–25 m/min carbide), heavy positive rake, rigid setup and flood high-pressure coolant; work-hardens and gums like other beta-Ti alloys.
Can Ti-12Mo-6Zr-2Fe HW-A be welded?
Yes — weldability is rated good (60/100). GTAW/plasma/EBW in high-purity argon or vacuum with full back purge; keep interstitials low and re-solution treat afterwards to restore ductility.
What surface finishes work on Ti-12Mo-6Zr-2Fe HW-A?
Passivate per ASTM F86; electropolish or mirror-polish bearing/implant surfaces; anodic oxide colouring for marking, no hard-coat anodize.
Can Ti-12Mo-6Zr-2Fe HW-A be formed, bent or molded?
Cold formable in the solution-treated condition (bending, drawing, wire coiling); hot work above the beta transus (~740–760 °C) then water quench.
What is the maximum service temperature of Ti-12Mo-6Zr-2Fe HW-A?
Ti-12Mo-6Zr-2Fe HW-A is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Ti-12Mo-6Zr-2Fe-ST and Ti-12Mo-6Zr-2Fe-STA?
ST is the default condition — standard supply condition for implant bar and forgings: lowest modulus, best ductility and cold formability. STA: pick when higher strength and wear resistance are needed and reduced ductility/modulus benefit is acceptable. Yield strength is 990 MPa in ST versus 1,180 MPa in STA.
Sources
- ASTM F1813 — Standard Specification for Wrought Titanium-12Molybdenum-6Zirconium-2Iron Alloy for Surgical Implants (UNS R58120) — ASTM International (2021)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- Materials and Coatings for Medical Devices: Titanium and Its Alloys — ASM International (2009)
- Titanium Alloy Guide / beta-Ti implant alloy property compilations — RMI Titanium (ATI) (2000)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.