ASTM B622 UNS N10001 Pipe (Hastelloy B / Alloy B) – Introduction
ASTM B622 UNS N10001 specifies seamless pipes and tubes manufactured from a nickel-molybdenum alloy commonly known as Hastelloy B or Alloy B. This alloy is especially designed for outstanding resistance to hydrochloric acid at all concentrations and temperatures, as well as other strong reducing media.
UNS N10001 pipes offer excellent resistance to pitting and stress corrosion cracking in reducing environments, making them a reliable material choice for chemical processing and acid handling applications.
Key Features
- Exceptional resistance to hydrochloric acid
- Excellent performance in strong reducing environments
- High resistance to pitting and stress corrosion cracking
- Good mechanical strength and ductility
- Suitable for high-temperature chemical services
- Reliable long-term corrosion resistance
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N10001 |
| W.Nr | 2.4810 |
| DIN | NiMo28 |
| Trade Names | Hastelloy B, Alloy B |
ASTM B622 UNS N10001 Chemical Composition
| Element | Content (%) |
|---|---|
| Nickel (Ni) | Balance |
| Molybdenum (Mo) | 26.0 – 30.0 |
| Iron (Fe) | 4.0 – 7.0 |
| Carbon (C) | ≤ 0.05 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.04 |
| Sulfur (S) | ≤ 0.03 |
Grade Hastelloy B Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 690 MPa (min) |
| Yield Strength (0.2% Proof) | 310 MPa (min) |
| Elongation | 40% (min) |
| Hardness | ≤ 95 HRB |
Grade Alloy B Physical Properties
| Property | Value |
|---|---|
| Density | 9.24 g/cm³ |
| Melting Range | 1330 – 1370°C |
| Thermal Conductivity | 9.8 W/m·K |
| Electrical Resistivity | 1.20 µΩ·m |
| Modulus of Elasticity | 205 GPa |
Type of ASTM B622 UNS N10001 Pipes
- UNS N10001 Seamless Pipe
- UNS N10001 Seamless Tube
- Hot Finished Pipes
- Cold Drawn Pipes
- Bright Annealed Tubes
- Chemical Process Pipes
- Heat Exchanger Tubes
Applications
- Hydrochloric acid production and handling
- Chemical processing equipment
- Acid pickling and regeneration units
- Petrochemical and refinery services
- Heat exchangers and condensers
- Pulp and paper industry
- Pollution control and waste treatment systems
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