Nickel Alloy Hastelloy W-SA (Solution annealed)
Heat-treated state · default condition
UNS N10004
Standard supply condition for sheet, plate, bar and wire — maximum ductility and corrosion resistance.
Values for the SA condition
Other Hastelloy W tempers and conditions
Hastelloy W is listed in 4 conditions; see the grade overview at Hastelloy W.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Hot worked and solution annealed | Heavy sections; slightly lower strength and hardness than thin annealed sheet because of coarser grain. | 380 | 820 | 42 | 10 HRC | 1.3 % IACS |
SADefaultThis page Solution annealed | Standard supply condition for sheet, plate, bar and wire — maximum ductility and corrosion resistance. | 400 | 855 | 45 | 195 HB | — |
As-welded deposit | Use these values when Hastelloy W is applied as a dissimilar-metal filler wire rather than as base metal. | 450 | 790 | 30 | 210 HB | 1.3 % IACS |
Cold drawn | Chosen for higher strength fasteners and springs; ductility and corrosion margin are reduced by residual stress. | 880 | 1,100 | 15 | 32 HRC | 1.3 % IACS |
What is Hastelloy W-SA?
Hastelloy W-SA is Hastelloy W heat treated to SA — standard supply condition for sheet, plate, bar and wire — maximum ductility and corrosion resistance. Hastelloy W-SA has a yield strength of 400 MPa (58 ksi) and a tensile strength of 855 MPa (124 ksi) — stronger than 56% of nickel alloy grades. Elongation at break is 45% and the elastic modulus is 216 GPa (31.3 Msi). Hastelloy W-SA has a density of 9.03 g/cm³ (0.326 lb/in³), heavier than 93% of nickel alloy grades. It melts at 1,305°C (2,381 °F).
Limitations
- Poor heat conductor — 8.7 W/m·K (5.03 BTU/hr·ft·°F), worse than 99% of nickel alloy grades
Hastelloy W-SA properties
Typical room-temperature values for Hastelloy W-SA; 11 are specific to this condition. Other listed values are Hastelloy W reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
Hastelloy W-SA has a density of 9.03 g/cm³ (0.326 lb/in³), heavier than 93% of nickel alloy grades. It melts at 1,305°C (2,381 °F).
Mechanical15
Hastelloy W-SA has a yield strength of 400 MPa (58 ksi) and a tensile strength of 855 MPa (124 ksi) — stronger than 56% of nickel alloy grades. Elongation at break is 45% and the elastic modulus is 216 GPa (31.3 Msi).
Thermal6
Hastelloy W-SA is rated for continuous service to 760°C (1,400 °F). It conducts heat at 8.7 W/m·K (5.03 BTU/hr·ft·°F), worse than 99% of nickel alloy grades. Thermal expansion is 11.3 µm/m·K (6.28 µin/in·°F).
Electrical3
Hastelloy W-SA conducts electricity at 1.3 % IACS, worse than 83% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (78/100), better than 51% of nickel alloy grades.
Sustainability4
Producing a kilogram of Hastelloy W-SA takes about 150 MJ of energy and emits 12.5 kg of CO₂ — less than 68% of nickel alloy grades. Typical recycled content is 35%.
Manufacturability8
Hastelloy W-SA's machinability is poor (20/100, better than 53% of nickel alloy grades); weldability very good (80/100); formability good (65/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Hastelloy W-SA
Is Hastelloy W easy to machine?
Treat like C-276: rigid setup, positive-rake sharp carbide, slow speed (15–25 m/min) with heavy constant feed and flood coolant — never dwell, the alloy work-hardens instantly.
Can Hastelloy W be welded?
Excellent — GTAW/GMAW with matching ERNiMo-1 filler; keep interpass below ~100 °C, low heat input, and re-solution anneal (≈1160 °C, water quench) if the part will see 650–850 °C service.
Can Hastelloy W be formed, bent or molded?
Form hot at 1180–950 °C or cold with high-tonnage equipment; expect ~2× the force of 304 and plan intermediate solution anneals between cold-work passes.
What surface finishes work on Hastelloy W?
Pickle in HNO₃-HF or grit blast plus pickle to remove the tenacious Mo-rich oxide; electropolish for process-vessel cleanliness — no anodizing.
Hastelloy W 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 |
|---|---|---|
| Mo | 23.5 – 26 | 24.5 |
| Cr | 4 – 6 | 5 |
| Fe | 4 – 7 | 5.5 |
| Co | ≤ 2.5 | — |
| W | ≤ 1 | — |
| Mn | ≤ 1 | — |
| Si | ≤ 1 | — |
| V | ≤ 0.6 | — |
| C | ≤ 0.12 | — |
| P | ≤ 0.04 | — |
| S | ≤ 0.03 | — |
| Ni | balance | — |
Hastelloy W-SA — frequently asked
What is Hastelloy W-SA used for?
Hastelloy W-SA is typically used for welding filler for Ni-Mo alloys, chemical process components and reducing-acid service equipment. In short: ni-Mo weld filler grade; reducing-acid legacy alloy; largely superseded by C-276.
What is the yield strength of Hastelloy W-SA?
Hastelloy W-SA has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 855 MPa (124 ksi) — stronger than 56% of nickel alloy grades. Strength varies by condition: see the 4 listed tempers.
Is Hastelloy W-SA easy to machine?
Not especially — machinability is rated poor (20/100, better than 53% of nickel alloy grades). Treat like C-276: rigid setup, positive-rake sharp carbide, slow speed (15–25 m/min) with heavy constant feed and flood coolant — never dwell, the alloy work-hardens instantly.
Can Hastelloy W-SA be welded?
Yes — weldability is rated very good (80/100). Excellent — GTAW/GMAW with matching ERNiMo-1 filler; keep interpass below ~100 °C, low heat input, and re-solution anneal (≈1160 °C, water quench) if the part will see 650–850 °C service.
What surface finishes work on Hastelloy W-SA?
Pickle in HNO₃-HF or grit blast plus pickle to remove the tenacious Mo-rich oxide; electropolish for process-vessel cleanliness — no anodizing.
Can Hastelloy W-SA be formed, bent or molded?
Form hot at 1180–950 °C or cold with high-tonnage equipment; expect ~2× the force of 304 and plan intermediate solution anneals between cold-work passes.
What is the maximum service temperature of Hastelloy W-SA?
Hastelloy W-SA is rated for continuous use to about 760°C (1,400 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Hastelloy W-SA and Hastelloy W-CD?
SA is the default condition — standard supply condition for sheet, plate, bar and wire — maximum ductility and corrosion resistance. CD: chosen for higher strength fasteners and springs; ductility and corrosion margin are reduced by residual stress. Yield strength is 400 MPa in SA versus 880 MPa in CD.
Sources
- AMS 5786 — Nickel Alloy Welding Wire, 62Ni-24.5Mo-5Cr-5.5Fe (ERNiMo-1) — SAE International (2018)
- AMS 5755 — Nickel Alloy Bars, Forgings and Rings, Solution Heat Treated — SAE International (2016)
- ASTM B366 / UNS N10004 alloy designation — ASTM International (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (Ni-Mo alloys) — ASM International (1990)
- Hastelloy alloy W technical data — Haynes International (2015)
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.