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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