Stainless Steel V-57
UNS S51770
V-57 (S51770) is a vanadium-modified, A-286-type iron-base precipitation-hardening alloy that gains strength from solution treatment followed by aging.
Reference datasheet — V-57 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 STA condition
V-57 tempers and conditions
V-57 is supplied in 4 conditions, soft to hard. STA 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 |
|---|---|---|---|---|---|---|
Solution annealed | Soft supply condition for cold forming, deep drawing, machining of complex shapes and welding before aging. | 275 | 690 | 45 | 170 HB | — |
STADefault Solution treated and aged | Standard aerospace bar/forging condition — best balance of strength, ductility and 650 °C creep performance. | 725 | 1,070 | 20 | 32 HRC | — |
Solution treated ~900 °C (1650 °F) + aged 720 °C/16 h | Fine-grain low-temperature solution route for maximum room-temperature strength and notch ductility in fasteners and shafts. | 795 | 1,140 | 18 | 34 HRC | — |
Cold drawn/cold worked then aged | Choose for high-strength bolts, studs and springs where cold work plus aging pushes strength above the standard STA level. | 1,035 | 1,240 | 12 | 38 HRC | — |
What is V-57?
V-57 (S51770) is a vanadium-modified, A-286-type iron-base precipitation-hardening alloy that gains strength from solution treatment followed by aging. It is specified for aerospace fasteners and engine hardware needing more strength than A-286 at moderate temperature; bar, wire and forgings give about 725 MPa yield, 1070 MPa tensile, 20 % elongation and 302 HB (32 HRC) with service to 650 °C. Machinability (20) and formability (25) are low, welding is restricted to solution-treated material because of strain-age cracking, and supply is aerospace-order driven, with A-286 the usual substitute. V-57 has a density of 7.92 g/cm³ (0.286 lb/in³), heavier than 77% of stainless steel grades. It melts at 1,370°C (2,498 °F). V-57 has a yield strength of 725 MPa (105 ksi) and a tensile strength of 1,070 MPa (155 ksi) — stronger than 93% of stainless steel grades. Elongation at break is 20% and the elastic modulus is 201 GPa (29.2 Msi).
What is V-57 used for?
- aerospace fasteners
- turbine engine hardware
- high-strength bolting
Advantages
- High strength — 725 MPa (105 ksi), better than 93% of stainless steel grades
Limitations
- Difficult to machine — 20/100, worse than 98% of stainless steel grades
- High embodied carbon — 6.8 kg CO₂/kg, worse than 95% of stainless steel grades
- Low electrical conductivity — 1.9 % IACS, worse than 84% of stainless steel grades
- Difficult to weld — 40/100, worse than 83% of stainless steel grades
- Limited ductility — 20%, worse than 79% of stainless steel grades
V-57 properties
Typical room-temperature values for V-57-STA; bars are the position among stainless steel grades.
Physical3
V-57 has a density of 7.92 g/cm³ (0.286 lb/in³), heavier than 77% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Mechanical16
V-57 has a yield strength of 725 MPa (105 ksi) and a tensile strength of 1,070 MPa (155 ksi) — stronger than 93% of stainless steel grades. Elongation at break is 20% and the elastic modulus is 201 GPa (29.2 Msi).
Thermal6
V-57 is rated for continuous service to 650°C (1,202 °F). It conducts heat at 14 W/m·K (8.09 BTU/hr·ft·°F), worse than 80% of stainless steel grades. Thermal expansion is 16.5 µm/m·K (9.17 µin/in·°F).
Electrical3
V-57 conducts electricity at 1.9 % IACS, worse than 84% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 52% of stainless steel grades.
Sustainability4
Producing a kilogram of V-57 takes about 95 MJ of energy and emits 6.8 kg of CO₂ — more than 96% of stainless steel grades. Typical recycled content is 30%.
Manufacturability7
V-57's machinability is poor (20/100, worse than 98% of stainless steel grades); weldability fair (40/100); formability poor (25/100).
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 stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. V-57 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with V-57
Is V-57 easy to machine?
Machine in the solution-treated state where possible; aged material is gummy and work-hardening — use rigid setups, positive-rake carbide or ceramic, low speed (15–25 m/min carbide), heavy feed and flood coolant.
Can V-57 be welded?
GTAW/EBW in the solution-treated condition with matching A-286/V-57 or Ni-base filler, then full solution + age; avoid welding aged material because of strain-age (post-weld) cracking.
Can V-57 be formed, bent or molded?
Cold form, roll-thread or coil springs before aging (solution-treated stock is quite ductile); hot work at 1010–1150 °C and finish above 950 °C to avoid tearing.
V-57 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 |
|---|---|---|
| C | ≤ 0.08 | 0.05 |
| Mn | ≤ 0.35 | 0.25 |
| Si | ≤ 0.75 | 0.4 |
| P | ≤ 0.03 | |
| S | ≤ 0.03 | |
| Cr | 13 – 16 | 14.8 |
| Ni | 25.5 – 28.5 | 27 |
| Mo | 1 – 1.5 | 1.25 |
| Tiγ′ Ni₃(Ti,Al) former | 2.7 – 3.2 | 3 |
| Vvanadium addition distinguishing V-57 from A-286 | 0.1 – 0.5 | 0.3 |
| Al | ≤ 0.35 | 0.25 |
| Bgrain-boundary strengthener | 0.01 | 0.01 |
| Febalance, ~52 % | balance |
What surface finishes work on V-57?
Passivate per ASTM A967 or electropolish; no anodizing — for high-temperature fasteners silver, cadmium-free lubricious coatings or dry-film lubricants are typical.
Surface treatments FabDigit runs on stainless steel 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).
Passivation
Organic Coating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel V-57 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- S51770
How much does V-57 cost?
V-57 is a high-cost stainless steel ($$$$), 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.
V-57 — frequently asked
What is V-57 used for?
V-57 is typically used for aerospace fasteners, turbine engine hardware and high-strength bolting. In short: higher-strength A-286 type; 650 °C aerospace fastener alloy; age-hardened iron-base superalloy.
What is the yield strength of V-57?
V-57 has a typical yield strength of 725 MPa (105 ksi) and a tensile strength of 1,070 MPa (155 ksi) — stronger than 93% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is V-57 easy to machine?
Not especially — machinability is rated poor (20/100, worse than 98% of stainless steel grades). Machine in the solution-treated state where possible; aged material is gummy and work-hardening — use rigid setups, positive-rake carbide or ceramic, low speed (15–25 m/min carbide), heavy feed and flood coolant.
Can V-57 be welded?
With care — weldability is rated fair (40/100). GTAW/EBW in the solution-treated condition with matching A-286/V-57 or Ni-base filler, then full solution + age; avoid welding aged material because of strain-age (post-weld) cracking.
What surface finishes work on V-57?
Passivate per ASTM A967 or electropolish; no anodizing — for high-temperature fasteners silver, cadmium-free lubricious coatings or dry-film lubricants are typical.
Can V-57 be formed, bent or molded?
Cold form, roll-thread or coil springs before aging (solution-treated stock is quite ductile); hot work at 1010–1150 °C and finish above 950 °C to avoid tearing.
What is the maximum service temperature of V-57?
V-57 is rated for continuous use to about 650°C (1,202 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between V-57-STA and V-57-ST?
STA is the default condition — standard aerospace bar/forging condition — best balance of strength, ductility and 650 °C creep performance. ST: soft supply condition for cold forming, deep drawing, machining of complex shapes and welding before aging. Yield strength is 725 MPa in STA versus 275 MPa in ST.
How much does V-57 cost?
V-57 is a high-cost stainless steel ($$$$), 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
- AMS 5770 — Fe-Ni-Cr precipitation-hardenable alloy bars, forgings and rings — SAE International (2018)
- ASTM A638/A638M — Precipitation Hardening Iron Base Superalloy Bars, Forgings and Forging Stock for High-Temperature Service — ASTM (2019)
- ASM Specialty Handbook: Heat-Resistant Materials — ASM International (1997)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- MMPDS-18 (A-286 class Fe-Ni superalloy allowables, used as analogue) — Battelle/FAA (2023)
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.