Hastelloy B2 Round Bar (UNS N10665)
Hastelloy B2 Round Bar is a nickel–molybdenum alloy developed as an improved version of Hastelloy B, offering exceptional resistance to hydrochloric acid and other strong reducing environments. With tighter control of iron and chromium impurities, Hastelloy B2 provides enhanced resistance to pitting, crevice corrosion, and intergranular attack, ensuring reliable performance in severe chemical conditions.
Hastelloy B2 Round Bar (also known as Alloy B2 Round Bar) maintains good mechanical strength at elevated temperatures and exhibits excellent fabricability and weldability when proper procedures are followed. However, like other B-family alloys, it should not be used in oxidizing environments.
Key Features
- Outstanding resistance to hydrochloric acid at all concentrations
- Excellent performance in strong reducing environments
- Improved resistance to pitting and intergranular corrosion
- Good high-temperature strength
- Good weldability and fabrication with proper heat treatment
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N10665 |
| DIN | 2.4617 |
| EN | NiMo28 |
| JIS | NW 1066 |
Sizes
| Diameter Range | Length |
|---|---|
| 6 mm – 300 mm | 3 m, 6 m, Cut to Length |
| Custom Sizes | As per requirement |
Hastelloy B2 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Nickel (Ni) | Balance |
| Molybdenum (Mo) | 26.0 – 30.0 |
| Iron (Fe) | ≤ 2.0 |
| Chromium (Cr) | ≤ 1.0 |
| Carbon (C) | ≤ 0.02 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 0.10 |
UNS N10665 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 690 MPa |
| Yield Strength | ≥ 310 MPa |
| Elongation | ≥ 40% |
| Hardness | ~200 HB |
Alloy B2 Round Bar Physical Properties
| Property | Value |
|---|---|
| Density | 9.24 g/cm³ |
| Melting Range | 1330 – 1380°C |
| Thermal Conductivity | ~10.2 W/m·K |
| Electrical Resistivity | ~1.15 µΩ·m |
Types of Hastelloy B2 Round Bar
- Hot Rolled Round Bar
- Cold Drawn Round Bar
- Annealed Round Bar
- Bright / Precision Ground Round Bar
- Forged Round Bar
Applications
- Hydrochloric acid processing equipment
- Chemical reactors and heat exchangers
- Petrochemical and chemical processing plants
- Pickling equipment
- Pressure vessels and piping components
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