ASTM B622 UNS N10675 Pipe (Hastelloy B-3 / Alloy B-3) – Introduction
ASTM B622 UNS N10675 specifies seamless pipes and tubes manufactured from a nickel-molybdenum alloy known as Hastelloy B-3 or Alloy B-3. This alloy is an advanced version of the B-series, developed to provide exceptional resistance to hydrochloric acid while significantly improving thermal stability and fabrication characteristics compared to Hastelloy B and B-2.
UNS N10675 pipes offer outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking in strong reducing environments, making them ideal for critical chemical processing applications.
Key Features
- Exceptional resistance to hydrochloric acid at all concentrations
- Improved thermal stability over Hastelloy B and B-2
- Excellent resistance to pitting and stress corrosion cracking
- Reduced susceptibility to weld heat-affected zone issues
- Good fabricability and weldability
- Long service life in severe reducing environments
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N10675 |
| W.Nr | 2.4600 |
| DIN | NiMo28 |
| Trade Names | Hastelloy B-3, Alloy B-3 |
ASTM B622 UNS N10675 Chemical Composition (%)
| Element | Content (%) |
|---|---|
| Nickel (Ni) | Balance |
| Molybdenum (Mo) | 26.0 – 30.0 |
| Iron (Fe) | ≤ 1.0 |
| Cobalt (Co) | ≤ 3.0 |
| Chromium (Cr) | ≤ 1.0 |
| Carbon (C) | ≤ 0.01 |
| Manganese (Mn) | ≤ 0.50 |
| Silicon (Si) | ≤ 0.10 |
| Phosphorus (P) | ≤ 0.04 |
| Sulfur (S) | ≤ 0.01 |
Hastelloy B-3 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 690 MPa (min) |
| Yield Strength (0.2% Proof) | 310 MPa (min) |
| Elongation | 40% (min) |
| Hardness | ≤ 95 HRB |
Alloy B-3 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 N10675 Pipes
- UNS N10675 Seamless Pipe
- UNS N10675 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
- Pickling and acid regeneration units
- Petrochemical and refinery plants
- Heat exchangers and condensers
- Pulp and paper industry
- Pollution control and waste treatment systems
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