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ASTM A302 Grade D is a manganese–molybdenum alloy pressure vessel steel designed for medium‑temperature service.
It offers improved strength, excellent toughness, and reliable weldability, making it suitable for boilers, heat exchangers, and pressure ves
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ASTM A302 Grade D is a manganese–molybdenum alloy pressure vessel steel designed for medium‑temperature service. It offers improved strength, excellent toughness, and reliable weldability, making it suitable for boilers, heat exchangers, and pressure vessels operating under elevated temperature conditions. Compared with Grades A/B/C, Grade D provides enhanced impact resistance and stable performance in demanding industrial environments.
Chemical Composition
Mechanical Properties
Chemical Composition
| C | Mn | P | S | Si | Mo |
| ≤0.25 | 1.15-1.50 | ≤0.035 | ≤0.035 | 0.15-0.50 | 0.45-0.60 |
Mechanical Properties
| Property | Yield Strength | Tensile Strength | Elongation |
| Requirement | 310MPa | 515-690 MPa | ≥ 17% |
Applications
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Boilers — Medium‑temperature boiler shells
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Pressure vessels
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Heat exchangers
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Petrochemical equipment
