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ASTM A302 Grade C is a specification for pressure vessel steel plate, which is used for high-temperature service applications. The steel plate is composed of alloy materials, including manganese, molybdenum, and nickel, which provide excellent resistance to high-temperature environments.
The mechanical properties of ASTM A302 Grade C steel plate are as follows:
| A302 Grade C Chemical Composition | |||||||
| Carbon, max | % | Manganese, max | % | Silicon, max | % | Sulfur max | % |
| 25mm or under | 0.2 | Heat Analysis | 1.15-1.50 | Heat Analysis | 0.15-0.40 | All thick | 0.035 |
| 25-50mm | 0.23 | Product Analysis | 1.07-1.62 | Product Analysis | 0.13-0.45 | ||
| over 50mm | 0.25 | ||||||
| Molybdenum max | % | Nickel max | % | Phosphorus | % | ||
| Heat Analysis | 0.45-0.60 | Heat Analysis | 0.40-0.70 | All thick | 0.035 | ||
| Product Analysis | 0.41-0.64 | Product Analysis | 0.37-0.73 | ||||
| Mechanical Property of A302 Grade C steel plate | A302 Grade C |
| Tensile strength, kis [MPa] | 80-100 [550-690] |
| Yield strength, min, kis [MPa] | 50 [345] |
| Elongation in 8 in. [200 mm], min, % | 17 |
| Elongation in 2 in. [50 mm], min, % | 20 |
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