Nickel Alloy Hastelloy B-2 HF-A
Heat-treated state
UNS N10665 · EN 2.4617, NiMo28
HF-A = hot finished / hot worked, solution annealed
Choose for hot-rolled or forged bar, flanges and valve bodies where section size prevents cold work.
Values for the HF-A condition
Other Hastelloy B-2 tempers and conditions
Hastelloy B-2 is listed in 5 conditions; see the grade overview at Hastelloy B-2.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
HF-AThis page 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 HF-A?
Hastelloy B-2 HF-A is Hastelloy B-2 heat treated to HF-A — choose for hot-rolled or forged bar, flanges and valve bodies where section size prevents cold work. Hastelloy B-2 HF-A has a yield strength of 400 MPa (58 ksi) and a tensile strength of 860 MPa (125 ksi) — stronger than 56% of nickel alloy grades. Elongation at break is 48% and the elastic modulus is 217 GPa (31.5 Msi). Hastelloy B-2 HF-A 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). SA is the default condition FabDigit quotes; HF-A is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 48%, better than 83% 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 HF-A properties
Typical room-temperature values for Hastelloy B-2 HF-A; 22 are specific to this condition. Other listed values are Hastelloy B-2 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
Hastelloy B-2 HF-A 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 HF-A has a yield strength of 400 MPa (58 ksi) and a tensile strength of 860 MPa (125 ksi) — stronger than 56% of nickel alloy grades. Elongation at break is 48% and the elastic modulus is 217 GPa (31.5 Msi).
Thermal5
Hastelloy B-2 HF-A 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 HF-A 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 HF-A 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 HF-A's machinability is poor (22/100, better than 64% of nickel alloy grades); weldability very good (72/100); formability good (66/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Hastelloy B-2 HF-A
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.
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.
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 | — |
Hastelloy B-2 HF-A — frequently asked
What is Hastelloy B-2 HF-A used for?
Hastelloy B-2 HF-A 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 HF-A?
Hastelloy B-2 HF-A has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 860 MPa (125 ksi) — stronger than 56% of nickel alloy grades. Strength varies by condition: see the 5 listed tempers.
Is Hastelloy B-2 HF-A 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 HF-A 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 HF-A?
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 HF-A 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 HF-A?
Hastelloy B-2 HF-A 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.