国外阀门材料常用技术标准 高温高压螺栓用碳钢及合金钢螺母(1)
| 牌号 | 最低回火温度°F[℃] |
| 2H | 850[455] |
| 2HM | 1150[620] |
| 3 | 1050[565] |
| 4 | 1100[595] |
| 6和6F | 1100[595] |
| 7 | 1100[595] |
| 7M | 1150[620] |
| 16 | 1200[650] |
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