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ASTM A302 Grade C is a Mn–Mo alloy pressure vessel steel designed for medium‑temperature and hydrogen‑service environments.
Compared with Grade A/B, Grade C provides higher strength and improved resistance to hydrogen‑induced cracking, making it suitable
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ASTM A302 Grade C is a Mn–Mo alloy pressure vessel steel designed for medium‑temperature and hydrogen‑service environments. Compared with Grade A/B, Grade C provides higher strength and improved resistance to hydrogen‑induced cracking, making it suitable for boilers, heat exchangers, refinery vessels, and welded pressure equipment operating under cyclic thermal loads.
Chemical Composition
Mechanical Properties
Dimensions
Applications
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 | ≥ 275 M Pa | 485-620MPa | ≥ 18% |
| Impact Toughness:As required by plate thickness | |||
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 & heat exchangers
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Petrochemical and refinery vessels
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Industrial welded tanks and containers
