Titanium Ti-3Al-8V-6Cr-4Mo-4Zr
UNS R58640 · also 4957
Ti-3Al-8V-6Cr-4Mo-4Zr (UNS R58640, AMS 4957) is a heavily beta-stabilized metastable beta titanium alloy with very high hardenability, available solution treated, beta annealed, cold drawn and in aged conditions.
Reference datasheet — Ti-3Al-8V-6Cr-4Mo-4Zr 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-3Al-8V-6Cr-4Mo-4Zr tempers and conditions
Ti-3Al-8V-6Cr-4Mo-4Zr is supplied in 5 conditions, soft to hard. ST is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
STDefault Solution annealed | Standard stocked condition: softest, lowest modulus, best cold forming and coiling before aging. | 850 | 900 | 18 | 32 HRC | — |
Solution treated + over-aged (≈565–620 °C) for toughness | Pick when damage tolerance / SCC resistance matters more than peak strength (subsea, deep-well hardware). | 1,060 | 1,130 | 12 | 37 HRC | 1.2 % IACS |
Cold drawn | Wire and small bar for spring coiling: work hardened but still coilable, aged after forming. | 1,080 | 1,150 | 10 | 38 HRC | 1.1 % IACS |
Solution treated and aged | Main high-strength structural condition: ~1200–1400 MPa with deep through-hardening in thick sections. | 1,240 | 1,300 | 8 | 42 HRC | — |
Cold drawn + aged | Highest strength form of Beta C: cold-worked wire aged after coiling for springs and high-strength fasteners. | 1,420 | 1,500 | 5 | 45 HRC | — |
Supply forms, finishes and certifications
Ways Ti-3Al-8V-6Cr-4Mo-4Zr is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
BA | Beta annealed | Surface finish |
What is Ti-3Al-8V-6Cr-4Mo-4Zr?
Ti-3Al-8V-6Cr-4Mo-4Zr (UNS R58640, AMS 4957) is a heavily beta-stabilized metastable beta titanium alloy with very high hardenability, available solution treated, beta annealed, cold drawn and in aged conditions. It is chosen for high strength combined with a low 86 GPa modulus — typical values are 850 MPa yield, 900 MPa tensile, 18% elongation and 32 HRC — which suits springs, coiled wire and fasteners. Service is limited to about 200 °C, machinability is poor (score 18), and welding must be done before aging. Ti-13V-11Cr-3Al is the nearer choice for cold-formed sheet. Ti-3Al-8V-6Cr-4Mo-4Zr has a density of 4.82 g/cm³ (0.174 lb/in³), heavier than 94% of titanium grades. It melts at 1,650°C (3,002 °F). Ti-3Al-8V-6Cr-4Mo-4Zr has a yield strength of 850 MPa (123 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 66% of titanium grades. Elongation at break is 18% and the elastic modulus is 86 GPa (12.5 Msi).
What is Ti-3Al-8V-6Cr-4Mo-4Zr used for?
- springs
- fasteners
- subsea cable armor
- high-strength aerospace parts
Advantages
- Tough — resists crack growth — 90 MPa·√m (81.9 ksi·√in), better than 97% of titanium grades
Limitations
- Limited service temperature — 200°C (392 °F), worse than 100% of titanium grades
- Low stiffness — 86 GPa (12.5 Msi), worse than 95% of titanium grades
- Difficult to weld — 60/100, worse than 83% of titanium grades
Ti-3Al-8V-6Cr-4Mo-4Zr properties
Typical room-temperature values for Ti-3Al-8V-6Cr-4Mo-4Zr-ST; bars are the position among titanium grades.
Physical3
Ti-3Al-8V-6Cr-4Mo-4Zr has a density of 4.82 g/cm³ (0.174 lb/in³), heavier than 94% of titanium grades. It melts at 1,650°C (3,002 °F).
Mechanical15
Ti-3Al-8V-6Cr-4Mo-4Zr has a yield strength of 850 MPa (123 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 66% of titanium grades. Elongation at break is 18% and the elastic modulus is 86 GPa (12.5 Msi).
Thermal6
Ti-3Al-8V-6Cr-4Mo-4Zr is rated for continuous service to 200°C (392 °F). It conducts heat at 7.6 W/m·K (4.39 BTU/hr·ft·°F), worse than 59% of titanium grades. Thermal expansion is 9.4 µm/m·K (5.22 µin/in·°F).
Electrical3
Ti-3Al-8V-6Cr-4Mo-4Zr conducts electricity at 1.1 % IACS, worse than 67% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (92/100), better than 53% of titanium grades.
Sustainability4
Producing a kilogram of Ti-3Al-8V-6Cr-4Mo-4Zr takes about 700 MJ of energy and emits 45 kg of CO₂ — more than 74% of titanium grades. Typical recycled content is 25%.
Manufacturability8
Ti-3Al-8V-6Cr-4Mo-4Zr's machinability is poor (18/100, worse than 83% of titanium grades); weldability good (60/100); formability good (65/100).
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-3Al-8V-6Cr-4Mo-4Zr is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Ti-3Al-8V-6Cr-4Mo-4Zr
Is Ti-3Al-8V-6Cr-4Mo-4Zr easy to machine?
Difficult: use rigid setups, sharp carbide/PVD tooling, low surface speed (~20–35 m/min aged), heavy positive rake and flood high-pressure coolant to avoid work hardening and galling.
Can Ti-3Al-8V-6Cr-4Mo-4Zr be welded?
GTAW/EBW/laser under high-purity inert gas or vacuum with full backside shielding; welds are solution-treated-like and must be re-aged to reach strength — avoid welding in the aged condition.
Can Ti-3Al-8V-6Cr-4Mo-4Zr be formed, bent or molded?
Cold form, coil and bend in the solution-treated condition (allow large springback due to low modulus), then age; hot work in the beta field ~750–870 °C.
Ti-3Al-8V-6Cr-4Mo-4Zr 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 |
|---|---|---|
| Al | 3 – 4 | 3.5 |
| V | 7.5 – 8.5 | 8 |
| Cr | 5.5 – 6.5 | 6 |
| Mo | 3.5 – 4.5 | 4 |
| Zr | 3.5 – 4.5 | 4 |
| Fe | ≤ 0.3 | 0.15 |
| O | ≤ 0.14 | 0.1 |
| C | ≤ 0.05 | 0.02 |
| N | ≤ 0.03 | 0.01 |
| Hmax (0.015 typical for bar/billet) | ≤ 0.02 | 0.01 |
| Other, eachresiduals, 0.40 total max | ≤ 0.1 | |
| Ti | balance |
What surface finishes work on Ti-3Al-8V-6Cr-4Mo-4Zr?
Pickle/blast to remove alpha case after hot work; accepts color/Type II anodizing (AMS 2488) or passivation; for wear surfaces use nitriding or DLC/hard coatings rather than bare metal.
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-3Al-8V-6Cr-4Mo-4Zr in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- R58640
- Trade names
- 4957
- Also called
- Beta C
How much does Ti-3Al-8V-6Cr-4Mo-4Zr cost?
Ti-3Al-8V-6Cr-4Mo-4Zr 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-3Al-8V-6Cr-4Mo-4Zr — frequently asked
What is Ti-3Al-8V-6Cr-4Mo-4Zr used for?
Ti-3Al-8V-6Cr-4Mo-4Zr is typically used for springs, fasteners, subsea cable armor and high-strength aerospace parts. In short: high-hardenability beta titanium; spring and fastener grade; low 86 GPa modulus.
What is the yield strength of Ti-3Al-8V-6Cr-4Mo-4Zr?
Ti-3Al-8V-6Cr-4Mo-4Zr has a typical yield strength of 850 MPa (123 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 66% of titanium grades. Strength varies by condition: see the 5 listed tempers.
Is Ti-3Al-8V-6Cr-4Mo-4Zr easy to machine?
Not especially — machinability is rated poor (18/100, worse than 83% of titanium grades). Difficult: use rigid setups, sharp carbide/PVD tooling, low surface speed (~20–35 m/min aged), heavy positive rake and flood high-pressure coolant to avoid work hardening and galling.
Can Ti-3Al-8V-6Cr-4Mo-4Zr be welded?
Yes — weldability is rated good (60/100). GTAW/EBW/laser under high-purity inert gas or vacuum with full backside shielding; welds are solution-treated-like and must be re-aged to reach strength — avoid welding in the aged condition.
What surface finishes work on Ti-3Al-8V-6Cr-4Mo-4Zr?
Pickle/blast to remove alpha case after hot work; accepts color/Type II anodizing (AMS 2488) or passivation; for wear surfaces use nitriding or DLC/hard coatings rather than bare metal.
Can Ti-3Al-8V-6Cr-4Mo-4Zr be formed, bent or molded?
Cold form, coil and bend in the solution-treated condition (allow large springback due to low modulus), then age; hot work in the beta field ~750–870 °C.
What is the maximum service temperature of Ti-3Al-8V-6Cr-4Mo-4Zr?
Ti-3Al-8V-6Cr-4Mo-4Zr is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Ti-3Al-8V-6Cr-4Mo-4Zr-ST and Ti-3Al-8V-6Cr-4Mo-4Zr-CDA?
ST is the default condition — standard stocked condition: softest, lowest modulus, best cold forming and coiling before aging. CDA: highest strength form of Beta C: cold-worked wire aged after coiling for springs and high-strength fasteners. Yield strength is 850 MPa in ST versus 1,420 MPa in CDA.
How much does Ti-3Al-8V-6Cr-4Mo-4Zr cost?
Ti-3Al-8V-6Cr-4Mo-4Zr 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 B348 / B863 — Titanium and Titanium Alloy Bars and Wire (Grade 19, UNS R58640) — ASTM (2021)
- AMS 4957 / AMS 4958 — Titanium Alloy Wire 3Al-8V-6Cr-4Mo-4Zr — SAE International (2018)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Materials Properties Handbook: Titanium Alloys — ASM International (1994)
- Beta C (Ti-3Al-8V-6Cr-4Mo-4Zr) alloy datasheet — RTI/TIMET (titanium producers) (2016)
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.