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ASTM A302 Grade B is a manganese–molybdenum alloy pressure vessel steel plate engineered for medium‑temperature service where enhanced strength, toughness, and resistance to hydrogen‑induced cracking are required.
Its Mo‑alloyed composition provides impr
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ASTM A302 Grade B is a manganese–molybdenum alloy pressure vessel steel plate engineered for medium‑temperature service where enhanced strength, toughness, and resistance to hydrogen‑induced cracking are required. Its Mo‑alloyed composition provides improved thermal stability and reliable weldability, making it suitable for boilers, heat‑exchangers, and welded pressure vessels operating under cyclic temperature conditions.
Chemical Composition
Mechanical Properties
Dimensions
Chemical Composition
| C | Mn | P | S | Si | Mo |
| ≤0.25 | 1.15-1.50 | ≤0.035 | ≤ 0.035 | ≤ 0.60 | 0.45-0.60 |
Mechanical Properties
| Property | Yield Strength | Tensile Strength | Elongation |
| Requirement | ≥ 260 MPa | 450-850MPa | ≥ 19% |
Dimensions
| Thickness | 3–150 mm |
| Width | 1220–4200 mm |
| Length | 5000–18000 mm |
| Supports custom cutting, beveling, bending, welding, heat treatment, machining | |
Applications
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Medium‑temperature pressure vessels
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Hydrogen‑service equipment
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Boilers and heat‑exchangers
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Petrochemical and refinery vessels
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Industrial tanks and welded containers
