Nickel Alloy Hastelloy N
UNS N10003 · EN 2.4675
Hastelloy N (UNS N10003, 2.4675) is a nickel-molybdenum-chromium alloy developed for molten fluoride salt service, combining resistance to hot fluoride salts with good strength and structural stability at temperature.
Reference datasheet — Hastelloy N 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 N tempers and conditions
Hastelloy N is supplied in 7 conditions, soft to hard. SA is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As cast | For salt-pump casings and valve bodies that cannot be wrought; coarse dendritic structure gives lower ductility. | 300 | 550 | 15 | 14 HRC | 1.3 % IACS |
SADefault Solution annealed | Standard supply condition for plate, sheet, tube and forgings in molten-salt and HF service; best corrosion resistance and ductility. | 320 | 790 | 50 | 195 HB | — |
Modified Hastelloy N (Nb and/or Ti added), solution annealed | Choose when tellurium-induced intergranular cracking or neutron-irradiation embrittlement must be resisted in a molten-salt reactor loop. | 350 | 830 | 45 | 205 HB | 1.4 % IACS |
As-welded deposit | Reference condition for weldments and for weld-metal qualification; ductility lower than base metal but no PWHT is required. | 420 | 760 | 33 | 16 HRC | 1.4 % IACS |
Stress relieved | Used on cold-formed or welded assemblies to cut residual stress while keeping part of the cold-work strength. | 480 | 860 | 35 | 18 HRC | 1.4 % IACS |
Cold drawn | Bar and rod for machined fittings, pump shafts and fasteners where higher yield and better surface are wanted. | 620 | 900 | 28 | 21 HRC | 1.4 % IACS |
Cold worked | Springy strip and small-bore tubing where high strength matters more than ductility; anneal before molten-salt service. | 800 | 1,030 | 15 | 30 HRC | 1.4 % IACS |
Supply forms, finishes and certifications
Ways Hastelloy N is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
HRA | Hot rolled and annealed plate | Surface finish |
What is Hastelloy N?
Hastelloy N (UNS N10003, 2.4675) is a nickel-molybdenum-chromium alloy developed for molten fluoride salt service, combining resistance to hot fluoride salts with good strength and structural stability at temperature. Solution-annealed material gives 320 MPa yield, 790 MPa tensile, 50 % elongation and 195 HB (91 HRB), with service to 704 °C; forms on file include solution-annealed and hot-rolled-annealed sheet and plate, cold-drawn and cold-worked bar, stress-relieved, as-welded, cast and modified variants. Machinability is low (18) and the chromium content is modest for oxidizing duty, so it is specified for salt loops rather than general acid plant work; C-276 covers wet oxidizing media instead. Hastelloy N has a density of 8.86 g/cm³ (0.32 lb/in³), heavier than 85% of nickel alloy grades. It melts at 1,300°C (2,372 °F). Hastelloy N has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 790 MPa (115 ksi) — weaker than 69% of nickel alloy grades. Elongation at break is 50% and the elastic modulus is 213 GPa (30.9 Msi).
What is Hastelloy N used for?
- molten salt reactor piping and vessels
- fluoride salt heat exchangers
- nuclear research reactor components
- high-temperature molten-salt process equipment
Advantages
- Ductile — tolerates forming and impact — 50%, better than 88% of nickel alloy grades
Hastelloy N properties
Typical room-temperature values for Hastelloy N-SA; bars are the position among nickel alloy grades.
Physical3
Hastelloy N has a density of 8.86 g/cm³ (0.32 lb/in³), heavier than 85% of nickel alloy grades. It melts at 1,300°C (2,372 °F).
Mechanical13
Hastelloy N has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 790 MPa (115 ksi) — weaker than 69% of nickel alloy grades. Elongation at break is 50% and the elastic modulus is 213 GPa (30.9 Msi).
Thermal6
Hastelloy N is rated for continuous service to 704°C (1,299 °F). It conducts heat at 11.6 W/m·K (6.7 BTU/hr·ft·°F), better than 60% of nickel alloy grades. Thermal expansion is 12.3 µm/m·K (6.83 µin/in·°F).
Electrical3
Hastelloy N conducts electricity at 1.4 % IACS, worse than 65% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), better than 74% of nickel alloy grades.
Sustainability4
Producing a kilogram of Hastelloy N takes about 165 MJ of energy and emits 12.5 kg of CO₂ — more than 54% of nickel alloy grades. Typical recycled content is 30%.
Manufacturability8
Hastelloy N's machinability is poor (18/100, worse than 61% 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 N is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Hastelloy N
Is Hastelloy N easy to machine?
Work-hardens fast and is gummy: use rigid setups, positive-rake carbide, low speed (15–25 m/min) with heavy feed, flood coolant and no dwelling.
Can Hastelloy N be welded?
Readily GTAW/GMAW/SMAW welded with matching Hastelloy N filler; keep low heat input and interpass temperature, no preheat or PWHT needed, avoid oxide/sulfur contamination.
Can Hastelloy N be formed, bent or molded?
Cold form in the annealed condition with ~2× the force of stainless; hot work at 1050–1180 °C and re-solution anneal at ~1175 °C followed by rapid cooling.
Hastelloy N 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 | 15 – 18 | 16 |
| Cr | 6 – 8 | 7 |
| Fe | ≤ 5 | 3 |
| C | 0.04 – 0.08 | 0.06 |
| Mn | ≤ 1 | 0.5 |
| Si | ≤ 1 | 0.5 |
| W | ≤ 0.5 | |
| V | ≤ 0.5 | 0.25 |
| Co | ≤ 0.2 | |
| Cu | ≤ 0.35 | |
| Al+Ticombined; Nb/Ti intentionally added in modified variants | ≤ 0.5 | |
| P | ≤ 0.02 | |
| S | ≤ 0.02 | |
| B | ≤ 0.01 | |
| Nibalance, typically ~70–72 % | balance |
What surface finishes work on Hastelloy N?
Not anodizable; pickle/grit-blast then passivate or electropolish, and remove all heat tint before molten-salt or HF service.
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 N in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N10003
- EN / DIN / Werkstoff-Nr.
- 2.4675
- Also called
- INOR-8
How much does Hastelloy N cost?
Hastelloy N 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 N — frequently asked
What is Hastelloy N used for?
Hastelloy N is typically used for molten salt reactor piping and vessels, fluoride salt heat exchangers, nuclear research reactor components and high-temperature molten-salt process equipment. In short: fluoride salt reference alloy; stable to 704 °C; low machinability, weld-friendly.
What is the yield strength of Hastelloy N?
Hastelloy N has a typical yield strength of 320 MPa (46.4 ksi) and a tensile strength of 790 MPa (115 ksi) — weaker than 69% of nickel alloy grades. Strength varies by condition: see the 7 listed tempers.
Is Hastelloy N easy to machine?
Not especially — machinability is rated poor (18/100, worse than 61% of nickel alloy grades). Work-hardens fast and is gummy: use rigid setups, positive-rake carbide, low speed (15–25 m/min) with heavy feed, flood coolant and no dwelling.
Can Hastelloy N be welded?
Yes — weldability is rated very good (80/100). Readily GTAW/GMAW/SMAW welded with matching Hastelloy N filler; keep low heat input and interpass temperature, no preheat or PWHT needed, avoid oxide/sulfur contamination.
What surface finishes work on Hastelloy N?
Not anodizable; pickle/grit-blast then passivate or electropolish, and remove all heat tint before molten-salt or HF service.
Can Hastelloy N be formed, bent or molded?
Cold form in the annealed condition with ~2× the force of stainless; hot work at 1050–1180 °C and re-solution anneal at ~1175 °C followed by rapid cooling.
What is the maximum service temperature of Hastelloy N?
Hastelloy N is rated for continuous use to about 704°C (1,299 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Hastelloy N-SA and Hastelloy N-CW?
SA is the default condition — standard supply condition for plate, sheet, tube and forgings in molten-salt and HF service; best corrosion resistance and ductility. CW: springy strip and small-bore tubing where high strength matters more than ductility; anneal before molten-salt service. Yield strength is 320 MPa in SA versus 800 MPa in CW.
How much does Hastelloy N cost?
Hastelloy N 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
- ASTM B434 — Ni-Mo-Cr-Fe Alloy (UNS N10003) Plate, Sheet and Strip — ASTM (2022)
- ASTM B573 — Ni-Mo-Cr-Fe Alloy Rod — ASTM (2021)
- Hastelloy N alloy technical data — Haynes International (2020)
- ORNL Reports on INOR-8 / Hastelloy N for Molten-Salt Reactors — Oak Ridge National Laboratory (1970)
- ASM Handbook Vol. 2 — Properties of Nickel and Nickel Alloys — ASM International (1990)
- GB/T 15007 / GH3535 — SAC (2017)
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.