Nickel Alloy Hastelloy B-3 HF-A
Heat-treated state
UNS N10675 · EN 2.4600, NiMo29Cr
HF-A = hot Finished and Annealed
Choose for heavy sections, forged valve bodies and machined parts where full annealed corrosion performance is required.
Values for the HF-A condition
Other Hastelloy B-3 tempers and conditions
Hastelloy B-3 is listed in 5 conditions; see the grade overview at Hastelloy B-3.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
HF-AThis page Hot Finished and Annealed | Choose for heavy sections, forged valve bodies and machined parts where full annealed corrosion performance is required. | 370 | 800 | 52 | 14 HRC | 1.3 % IACS |
SADefault Solution Annealed | Standard supply condition for plate, sheet, tube and pipe; maximum corrosion resistance and ductility. | 385 | 830 | 55 | 195 HB | — |
Cold Rolled and Annealed | Thin gauge sheet/strip with fine grain and best surface for forming of linings, bellows and clad plate. | 400 | 860 | 57 | 15 HRC | 1.3 % IACS |
As-welded deposit | Typical properties of weldments made with matching ERNiMo-10 filler; B-3 is normally usable as-welded in most acid service. | 430 | 780 | 40 | 18 HRC | 1.3 % IACS |
Cold worked | Use where higher strength, tighter tolerance and better chip control are needed and full annealed corrosion resistance is not critical. | 700 | 980 | 28 | 30 HRC | 1.2 % IACS |
What is Hastelloy B-3 HF-A?
Hastelloy B-3 HF-A is Hastelloy B-3 heat treated to HF-A — choose for heavy sections, forged valve bodies and machined parts where full annealed corrosion performance is required. Hastelloy B-3 HF-A has a yield strength of 370 MPa (53.7 ksi) and a tensile strength of 800 MPa (116 ksi) — weaker than 55% of nickel alloy grades. Elongation at break is 52% and the elastic modulus is 216 GPa (31.3 Msi). Hastelloy B-3 HF-A has a density of 9.24 g/cm³ (0.334 lb/in³), heavier than 99% of nickel alloy grades. It melts at 1,370°C (2,498 °F). SA is the default condition FabDigit quotes; HF-A is available on request or by drawing note.
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 — 450°C (842 °F), worse than 86% of nickel alloy grades
Hastelloy B-3 HF-A properties
Typical room-temperature values for Hastelloy B-3 HF-A; 22 are specific to this condition. Other listed values are Hastelloy B-3 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
Hastelloy B-3 HF-A has a density of 9.24 g/cm³ (0.334 lb/in³), heavier than 99% of nickel alloy grades. It melts at 1,370°C (2,498 °F).
Mechanical13
Hastelloy B-3 HF-A has a yield strength of 370 MPa (53.7 ksi) and a tensile strength of 800 MPa (116 ksi) — weaker than 55% of nickel alloy grades. Elongation at break is 52% and the elastic modulus is 216 GPa (31.3 Msi).
Thermal6
Hastelloy B-3 HF-A is rated for continuous service to 450°C (842 °F). It conducts heat at 11.3 W/m·K (6.53 BTU/hr·ft·°F), better than 50% of nickel alloy grades. Thermal expansion is 10.3 µm/m·K (5.72 µin/in·°F).
Electrical3
Hastelloy B-3 HF-A conducts electricity at 1.3 % IACS, worse than 97% 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 B-3 HF-A takes about 165 MJ of energy and emits 14 kg of CO₂ — more than 54% of nickel alloy grades. Typical recycled content is 35%.
Manufacturability8
Hastelloy B-3 HF-A's machinability is poor (20/100, better than 53% of nickel alloy grades); weldability very good (78/100); 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-3 HF-A
Is Hastelloy B-3 easy to machine?
Machine like a heavily work-hardening Ni alloy: rigid setup, positive-rake sharp carbide, low speed (15–25 m/min) with heavy positive feed, flood coolant, and never dwell or rub.
Can Hastelloy B-3 be welded?
Readily welded by GTAW/GMAW/SMAW with matching ERNiMo-10/ENiMo-10 filler; keep interpass below ~100 °C and heat input low, no preheat, and avoid the 550–800 °C range on cooling.
Can Hastelloy B-3 be formed, bent or molded?
Hot work between about 900 and 1180 °C then anneal and water quench; cold forming is feasible but the alloy work-hardens fast, so plan interstage anneals for deep draws.
What surface finishes work on Hastelloy B-3?
Pickle (HF-HNO₃ is aggressive on this alloy — use qualified nitric-free or controlled pickles) or grind and electropolish to remove oxide; no anodizing, and avoid iron contamination from carbon-steel tooling.
Hastelloy B-3 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 | 27 – 32 | 28.5 |
| Cr | 1 – 3 | 1.5 |
| Fe | 1 – 3 | 1.5 |
| Co | ≤ 3 | — |
| Mn | ≤ 3 | 0.25 |
| W | ≤ 3 | 0.3 |
| Al | ≤ 0.5 | 0.25 |
| Ti | ≤ 0.2 | — |
| Cu | ≤ 0.2 | — |
| Si | ≤ 0.1 | — |
| C | ≤ 0.01 | — |
| P | ≤ 0.03 | — |
| S | ≤ 0.01 | — |
| Nibalance, 65 % min | ≥ 65 (balance) | — |
Hastelloy B-3 HF-A — frequently asked
What is Hastelloy B-3 HF-A used for?
Hastelloy B-3 HF-A is typically used for hydrochloric acid process equipment, sulfuric acid handling, chemical reactors requiring good weldability and thermal stability and pharmaceutical and chemical processing vessels. In short: more stable than B-2; reducing-acid nickel alloy; weld-friendly HCl grade.
What is the yield strength of Hastelloy B-3 HF-A?
Hastelloy B-3 HF-A has a typical yield strength of 370 MPa (53.7 ksi) and a tensile strength of 800 MPa (116 ksi) — weaker than 55% of nickel alloy grades. Strength varies by condition: see the 5 listed tempers.
Is Hastelloy B-3 HF-A easy to machine?
Not especially — machinability is rated poor (20/100, better than 53% of nickel alloy grades). Machine like a heavily work-hardening Ni alloy: rigid setup, positive-rake sharp carbide, low speed (15–25 m/min) with heavy positive feed, flood coolant, and never dwell or rub.
Can Hastelloy B-3 HF-A be welded?
Yes — weldability is rated very good (78/100). Readily welded by GTAW/GMAW/SMAW with matching ERNiMo-10/ENiMo-10 filler; keep interpass below ~100 °C and heat input low, no preheat, and avoid the 550–800 °C range on cooling.
What surface finishes work on Hastelloy B-3 HF-A?
Pickle (HF-HNO₃ is aggressive on this alloy — use qualified nitric-free or controlled pickles) or grind and electropolish to remove oxide; no anodizing, and avoid iron contamination from carbon-steel tooling.
Can Hastelloy B-3 HF-A be formed, bent or molded?
Hot work between about 900 and 1180 °C then anneal and water quench; cold forming is feasible but the alloy work-hardens fast, so plan interstage anneals for deep draws.
What is the maximum service temperature of Hastelloy B-3 HF-A?
Hastelloy B-3 HF-A is rated for continuous use to about 450°C (842 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Hastelloy B-3-SA and Hastelloy B-3-CW?
SA is the default condition — standard supply condition for plate, sheet, tube and pipe; maximum corrosion resistance and ductility. CW: use where higher strength, tighter tolerance and better chip control are needed and full annealed corrosion resistance is not critical. Yield strength is 385 MPa in SA versus 700 MPa in CW.
Sources
- HASTELLOY B-3 alloy principal features and data — Haynes International (2020)
- ASTM B333 — Ni-Mo Alloy Plate, Sheet and Strip — ASTM (2018)
- ASTM B335 — Ni-Mo Alloy Rod — ASTM (2018)
- ASTM B622 / B619 — Ni-Mo Alloy Seamless and Welded Pipe and Tube — ASTM (2019)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- VdTÜV / W.-Nr. 2.4600 NiMo29Cr material data — DIN / VdTÜV (2016)
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.