Hangbo Alloy Group
Shanghai · Est. 2012
N10001 technical guide: nominal chemical composition, mechanical and physical properties, corrosion resistance, welding, product forms and ASTM standards...
Hastelloy B (UNS N10001) is a nickel-molybdenum alloy. Original Ni-Mo alloy, superb HCl resistance. Not for oxidising environments. This guide covers its nominal chemical composition, typical mechanical and physical properties, corrosion behaviour, welding, common applications, available product forms and the ASTM standards that apply — everything a specifier needs to evaluate Hastelloy B for a project.
Hastelloy B belongs to the nickel-molybdenum alloy class of materials. It is original ni-mo alloy, superb hcl resistance. It is not for oxidising environments. It is predecessor to b-2 / b-3.
Nominal (wt%) composition of Hastelloy B (UNS N10001):
| Element | Composition (wt%) |
|---|---|
| Nickel (Ni) | Balance |
| Molybdenum (Mo) | 26.0 – 30.0 |
| Iron (Fe) | 4.0 – 6.0 |
| Chromium (Cr) | ≤ 1.0 |
| Carbon (C) | ≤ 0.05 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 1.0 |
| Cobalt (Co) | ≤ 2.5 |
| Phosphorus (P) | ≤ 0.025 |
| Sulphur (S) | ≤ 0.030 |
Typical physical properties:
| Property | Value |
|---|---|
| Density | 9.24 g/cm³ |
| Melting Range | 1320 – 1380 °C |
| Thermal Expansion (20–1000 °C) | 11.0 µm/m·K |
| Thermal Conductivity (100 °C) | 12.0 W/m·K |
| Electrical Resistivity | 1.30 µΩ·m |
| Modulus of Elasticity | 211 GPa |
Typical room-temperature mechanical properties (annealed / specified condition unless noted):
| Property | Typical Value |
|---|---|
| Tensile Strength (Rm) | 790 MPa (115 ksi) |
| Yield Strength, 0.2% (Rp0.2) | 350 MPa (51 ksi) |
| Elongation in 50 mm | 40% |
| Hardness (Rockwell B) | 85 – 100 HRB |
| Property | Value |
|---|---|
| Service temperature | Up to ≈ 650 °C (non-oxidising) |
| Service note | Exceptional HCl resistance |
Hastelloy B is the original nickel-molybdenum alloy, giving exceptional resistance to hydrochloric acid at all concentrations and temperatures, and to many non-oxidising media. Its very low chromium means it is NOT for oxidising environments or those containing ferric/ cupric ions, which would attack it.
Welded with matching fillers; the low carbon avoids sensitisation in the HAZ. Avoid exposure to oxidising species during welding and service. Modern fabrications usually choose B-2/B-3 for better weldability.
The grade is supplied to the following common specifications:
| Standard | Product Form / Scope |
|---|---|
| ASTM B333 | Plate, sheet & strip |
| ASTM B335 | Bar |
| ASTM B619/B622 | Pipe/tube |
| ASTM B366 | Fittings |
Hastelloy B (UNS N10001) is the original nickel-molybdenum alloy, giving exceptional resistance to hydrochloric acid at all concentrations and temperatures and to many non-oxidising acids. Its very low chromium means it must NOT be used in oxidising environments.
Annealed: ≈ 790 MPa tensile, ≈ 350 MPa yield, 40 % elongation, 85–100 HRB.
With chromium ≤ 1 %, it lacks the passive film needed in oxidising acids or in solutions containing ferric/cupric ions, which would rapidly attack it. For oxidising duty choose a Ni-Cr-Mo grade (C family).
Yes, with matching fillers and low carbon to avoid HAZ sensitisation, but modern fabrications usually specify B-2 or B-3 for better weldability.
Hydrochloric acid handling/storage, non-oxidising sulphuric/phosphoric acid equipment, acid-etching vessels and older chemical-plant retrofits.
Plate/sheet/strip ASTM B333, bar ASTM B335, pipe/tube ASTM B619/B622, fittings ASTM B366.
As a dedicated nickel alloy manufacturer serving chemical processing, oil & gas sectors, Hangbo Alloy Group supplies the grades discussed here across all standard product forms with full ASTM/ASME documentation and EN 10204 3.1 certification. Our material is specified for applications where corrosion resistance, high-temperature strength, and traceable quality are non-negotiable. See our production & testing facilities for more on how every heat is verified.