Nickel Alloy Hastelloy B-2
UNS N10665 · EN 2.4617, NiMo28
Hastelloy B-2 (N10665, 2.4617, NiMo28) is a low-carbon, low-iron nickel-molybdenum solid-solution alloy with no deliberate chromium addition.
Reference datasheet — Hastelloy B-2 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 B-2 tempers and conditions
Hastelloy B-2 is supplied in 5 conditions, soft to hard. SA 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 |
|---|---|---|---|---|---|---|
Hot finished / hot worked, solution annealed | Choose for hot-rolled or forged bar, flanges and valve bodies where section size prevents cold work. | 400 | 860 | 48 | 195 HB | 1.3 % IACS |
SADefault Solution annealed | Standard supply condition for plate, sheet, strip, seamless and welded pipe/tube — maximum corrosion resistance and ductility. | 415 | 895 | 52 | 200 HB | — |
As-welded deposit | Choose when reporting weld-metal or weldment properties — B-2's very low C and Si allow service without post-weld solution annealing in most reducing-acid duties. | 470 | 830 | 35 | 215 HB | 1.3 % IACS |
Cold drawn, stress relieved | Choose for straight, close-tolerance bar and instrument tubing with moderately raised yield strength. | 700 | 1,000 | 25 | 24 HRC | 1.2 % IACS |
Cold worked | Choose for springs, fasteners and wire where strength matters more than optimum corrosion resistance. | 860 | 1,150 | 15 | 32 HRC | 1.2 % IACS |
What is Hastelloy B-2?
Hastelloy B-2 (N10665, 2.4617, NiMo28) is a low-carbon, low-iron nickel-molybdenum solid-solution alloy with no deliberate chromium addition. It is chosen for outstanding resistance to hydrochloric acid at all concentrations and temperatures, and to other strongly reducing chemicals, in plate, pipe, tube, bar and welded fittings. Annealed properties are about 415 MPa yield, 895 MPa tensile, 52% elongation and 200 HB, with service limited to roughly 425 °C; slow cooling through 550-800 °C causes ordering embrittlement, and oxidizing media such as ferric ions or nitric acid attack it. B-3 is the direct replacement where thermal stability and fabricability matter. Hastelloy B-2 has a density of 9.22 g/cm³ (0.333 lb/in³), heavier than 97% of nickel alloy grades. It melts at 1,330°C (2,426 °F). Hastelloy B-2 has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 895 MPa (130 ksi) — stronger than 61% of nickel alloy grades. Elongation at break is 52% and the elastic modulus is 217 GPa (31.5 Msi).
What is Hastelloy B-2 used for?
- hydrochloric acid production and concentration
- sulfuric and phosphoric acid equipment
- chemical process piping and reactors
- hydrogenation and hydrometallurgical equipment
Advantages
- Ductile — tolerates forming and impact — 52%, better than 90% of nickel alloy grades
Limitations
- Low electrical conductivity — 1.3 % IACS, worse than 97% of nickel alloy grades
- Limited service temperature — 425°C (797 °F), worse than 90% of nickel alloy grades
Hastelloy B-2 properties
Typical room-temperature values for Hastelloy B-2-SA; bars are the position among nickel alloy grades.
Physical3
Hastelloy B-2 has a density of 9.22 g/cm³ (0.333 lb/in³), heavier than 97% of nickel alloy grades. It melts at 1,330°C (2,426 °F).
Mechanical15
Hastelloy B-2 has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 895 MPa (130 ksi) — stronger than 61% of nickel alloy grades. Elongation at break is 52% and the elastic modulus is 217 GPa (31.5 Msi).
Thermal5
Hastelloy B-2 is rated for continuous service to 425°C (797 °F). It conducts heat at 11.1 W/m·K (6.41 BTU/hr·ft·°F), worse than 54% of nickel alloy grades. Thermal expansion is 10.3 µm/m·K (5.72 µin/in·°F).
Electrical3
Hastelloy B-2 conducts electricity at 1.3 % IACS, worse than 97% 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 B-2 takes about 185 MJ of energy and emits 14.5 kg of CO₂ — more than 73% of nickel alloy grades. Typical recycled content is 35%.
Manufacturability8
Hastelloy B-2's machinability is poor (22/100, better than 64% of nickel alloy grades); weldability very good (72/100); formability good (68/100).
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 B-2 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Hastelloy B-2
Is Hastelloy B-2 easy to machine?
Machine like a solid-solution nickel alloy: rigid setup, positive-rake sharp carbide, low speed/heavy positive feed to cut under the work-hardened skin, generous flood coolant — never dwell or rub.
Can Hastelloy B-2 be welded?
Readily welded by GTAW/GMAW/SMAW with matching ERNiMo-7 filler; keep heat input and interpass temperature low (≤95–120 °C), no preheat, and avoid slow cooling through 550–800 °C to prevent ordering embrittlement.
Can Hastelloy B-2 be formed, bent or molded?
Excellent cold ductility but a high work-hardening rate — allow extra press tonnage, generous bend radii and intermediate solution anneals (about 1065 °C + rapid quench) for severe forming; hot work 1180–900 °C.
Hastelloy B-2 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 | 26 – 30 | 28 |
| Fe | ≤ 2 | 1 |
| Cr | ≤ 1 | 0.5 |
| Co | ≤ 1 | |
| Mn | ≤ 1 | |
| Si | ≤ 0.1 | 0.05 |
| C | ≤ 0.02 | 0.01 |
| P | ≤ 0.04 | |
| S | ≤ 0.03 | |
| Culimit applied by some producer specs | ≤ 0.5 | |
| Nibalance, ~69 % | balance |
What surface finishes work on Hastelloy B-2?
Grind/pickle to remove all oxide and iron contamination after hot work or welding; no anodizing — surfaces are typically pickled, passivated or mechanically polished for process cleanliness.
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 B-2 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N10665
- EN / DIN / Werkstoff-Nr.
- 2.4617NiMo28
How much does Hastelloy B-2 cost?
Hastelloy B-2 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 B-2 — frequently asked
What is Hastelloy B-2 used for?
Hastelloy B-2 is typically used for hydrochloric acid production and concentration, sulfuric and phosphoric acid equipment, chemical process piping and reactors and hydrogenation and hydrometallurgical equipment. In short: benchmark HCl-service alloy; reducing acids, no chromium; largely superseded by B-3.
What is the yield strength of Hastelloy B-2?
Hastelloy B-2 has a typical yield strength of 415 MPa (60.2 ksi) and a tensile strength of 895 MPa (130 ksi) — stronger than 61% of nickel alloy grades. Strength varies by condition: see the 5 listed tempers.
Is Hastelloy B-2 easy to machine?
Not especially — machinability is rated poor (22/100, better than 64% of nickel alloy grades). Machine like a solid-solution nickel alloy: rigid setup, positive-rake sharp carbide, low speed/heavy positive feed to cut under the work-hardened skin, generous flood coolant — never dwell or rub.
Can Hastelloy B-2 be welded?
Yes — weldability is rated very good (72/100). Readily welded by GTAW/GMAW/SMAW with matching ERNiMo-7 filler; keep heat input and interpass temperature low (≤95–120 °C), no preheat, and avoid slow cooling through 550–800 °C to prevent ordering embrittlement.
What surface finishes work on Hastelloy B-2?
Grind/pickle to remove all oxide and iron contamination after hot work or welding; no anodizing — surfaces are typically pickled, passivated or mechanically polished for process cleanliness.
Can Hastelloy B-2 be formed, bent or molded?
Excellent cold ductility but a high work-hardening rate — allow extra press tonnage, generous bend radii and intermediate solution anneals (about 1065 °C + rapid quench) for severe forming; hot work 1180–900 °C.
What is the maximum service temperature of Hastelloy B-2?
Hastelloy B-2 is rated for continuous use to about 425°C (797 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Hastelloy B-2-SA and Hastelloy B-2-CW?
SA is the default condition — standard supply condition for plate, sheet, strip, seamless and welded pipe/tube — maximum corrosion resistance and ductility. CW: choose for springs, fasteners and wire where strength matters more than optimum corrosion resistance. Yield strength is 415 MPa in SA versus 860 MPa in CW.
How much does Hastelloy B-2 cost?
Hastelloy B-2 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
- HASTELLOY B-2 alloy technical data (UNS N10665) — Haynes International (2020)
- ASTM B333 — Ni-Mo Alloy Plate, Sheet and Strip — ASTM International (2018)
- ASTM B335 — Ni-Mo Alloy Rod — ASTM International (2020)
- ASTM B622 / B619 / B626 — Ni-Mo Alloy Pipe and Tube — ASTM International (2019)
- GB/T 15007 / NS3202-type Ni-Mo alloys (2017)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
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.