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ASTM A302 Grade A is a manganese–molybdenum alloy pressure‑vessel steel plate designed for medium‑temperature service where improved strength and toughness are required.
Its alloy system provides enhanced resistance to thermal stress and stable weldabili
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ASTM A302 Grade A is a manganese–molybdenum alloy pressure‑vessel steel plate designed for medium‑temperature service where improved strength and toughness are required. Its alloy system provides enhanced resistance to thermal stress and stable weldability, making it suitable for boilers, heat‑exchangers, and welded pressure vessels operating under fluctuating 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 | ≥ 205 MPa | 415-550MPa | ≥ 22% |
Dimensions
| Thickness | 3–150 mm |
| Width | 1220–4200 mm |
| Length | 5000–18000 mm |
| Supports custom cutting and shaping. | |
Applications
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Medium‑temperature pressure vessels
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Boilers and heat‑exchangers
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Industrial tanks and welded containers
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Petrochemical and power‑plant equipment
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Components requiring better strength than carbon‑steel vessel plates
