Titanium Ti-12Mo-6Zr-2Fe
UNS R58120 · ASTM F1813
Ti-12Mo-6Zr-2Fe (UNS R58120, ASTM F1813) is an aluminum- and vanadium-free metastable beta titanium alloy developed for orthopedic implants, where its 80 GPa modulus reduces stress shielding compared with Ti-6Al-4V.
Reference datasheet — Ti-12Mo-6Zr-2Fe is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the ST condition
Ti-12Mo-6Zr-2Fe tempers and conditions
Ti-12Mo-6Zr-2Fe is supplied in 4 conditions, soft to hard. ST is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
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?
Ti-12Mo-6Zr-2Fe (UNS R58120, ASTM F1813) is an aluminum- and vanadium-free metastable beta titanium alloy developed for orthopedic implants, where its 80 GPa modulus reduces stress shielding compared with Ti-6Al-4V. Typical properties are 990 MPa yield, 1060 MPa tensile, 19% elongation and 32 HRC, and it cold-forms well (formability 70) in the solution-treated condition for bar, wire and forged stems. Machinability is poor (15), service is limited to about 250 °C, and no weldability rating is on file, so welded joints must be qualified individually. Ti-12Mo-6Zr-2Fe 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). Ti-12Mo-6Zr-2Fe has a yield strength of 990 MPa (144 ksi) and a tensile strength of 1,060 MPa (154 ksi) — stronger than 92% of titanium grades. Elongation at break is 19% and the elastic modulus is 80 GPa (11.6 Msi).
What is Ti-12Mo-6Zr-2Fe used for?
- orthopedic implants
- spinal fixation devices
- hip stems
Advantages
- Polishes to a fine finish — 80/100, better than 98% of titanium grades
- High strength — 990 MPa (144 ksi), better than 92% of titanium grades
Limitations
- Limited service temperature — 250°C (482 °F), worse than 99% of titanium grades
- Low stiffness — 80 GPa (11.6 Msi), worse than 97% 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 properties
Typical room-temperature values for Ti-12Mo-6Zr-2Fe-ST; bars are the position among titanium grades.
Physical3
Ti-12Mo-6Zr-2Fe 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 has a yield strength of 990 MPa (144 ksi) and a tensile strength of 1,060 MPa (154 ksi) — stronger than 92% of titanium grades. Elongation at break is 19% and the elastic modulus is 80 GPa (11.6 Msi).
Thermal5
Ti-12Mo-6Zr-2Fe 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 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 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's machinability is poor (15/100, worse than 97% of titanium grades); weldability good (60/100); formability very good (70/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the titanium family
Yield strength against density for every titanium grade FabDigit runs. Ti-12Mo-6Zr-2Fe is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Ti-12Mo-6Zr-2Fe
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.
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 |
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.
Surface treatments FabDigit runs on titanium parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Titanium Ti-12Mo-6Zr-2Fe in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- R58120
- ASTM
- F1813
How much does Ti-12Mo-6Zr-2Fe cost?
Ti-12Mo-6Zr-2Fe is a high-cost titanium ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Ti-12Mo-6Zr-2Fe — frequently asked
What is Ti-12Mo-6Zr-2Fe used for?
Ti-12Mo-6Zr-2Fe 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?
Ti-12Mo-6Zr-2Fe has a typical yield strength of 990 MPa (144 ksi) and a tensile strength of 1,060 MPa (154 ksi) — stronger than 92% of titanium grades. Strength varies by condition: see the 4 listed tempers.
Is Ti-12Mo-6Zr-2Fe easy to machine?
Not especially — machinability is rated poor (15/100, worse than 97% 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 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?
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 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?
Ti-12Mo-6Zr-2Fe 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.
How much does Ti-12Mo-6Zr-2Fe cost?
Ti-12Mo-6Zr-2Fe is a high-cost titanium ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.