Nickel Alloy Hastelloy W
UNS N10004
Hastelloy W (UNS N10004) is an early-generation Ni-Mo-Cr-Fe corrosion alloy with good resistance to hydrochloric and other reducing acids.
Reference datasheet — Hastelloy W 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 SA condition
Hastelloy W tempers and conditions
Hastelloy W is supplied in 4 conditions, soft to hard. SA 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 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 |
SADefault 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?
Hastelloy W (UNS N10004) is an early-generation Ni-Mo-Cr-Fe corrosion alloy with good resistance to hydrochloric and other reducing acids. It is now used mainly as a welding filler for Ni-Mo alloys and for legacy chemical-process components; stock forms are limited to bar, sheet and welding wire, with typical properties of 400 MPa yield, 855 MPa tensile, 45 % elongation and 195 HB. Limits are a 760 °C service ceiling, poor machinability (score 20), moderate formability (65) and restricted availability, as the grade has largely been superseded. Hastelloy C-276 or B-3 is the normal replacement for new reducing-acid equipment. Hastelloy W 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). Hastelloy W 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).
What is Hastelloy W used for?
- welding filler for Ni-Mo alloys
- chemical process components
- reducing-acid service equipment
Limitations
- Poor heat conductor — 8.7 W/m·K (5.03 BTU/hr·ft·°F), worse than 99% of nickel alloy grades
Hastelloy W properties
Typical room-temperature values for Hastelloy W-SA; bars are the position among nickel alloy grades.
Physical3
Hastelloy W 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 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 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 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 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'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. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the nickel alloy family
Yield strength against density for every nickel alloy grade FabDigit runs. Hastelloy W is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Hastelloy W
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.
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 |
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.
Surface treatments FabDigit runs on nickel alloy 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).
Plating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Nickel Alloy Hastelloy W in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N10004
How much does Hastelloy W cost?
Hastelloy W is a high-cost nickel alloy ($$$$), 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.
Hastelloy W — frequently asked
What is Hastelloy W used for?
Hastelloy W 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?
Hastelloy W 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 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 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?
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 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?
Hastelloy W 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.
How much does Hastelloy W cost?
Hastelloy W is a high-cost nickel alloy ($$$$), 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 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; 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.