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PN160～320螺栓、螺母配对 _阀门标准
|
螺栓材料 |
40 |
40MnB |
35CrMoA |
40 |
35CrMo |
|
螺母材料 |
35 |
40Mn |
40Cr |
25 |
20CrMo |
|
备 注 |
JB/T 2773 JB/T 2775 |
中石化管道器材 |
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