Common valve material PN 160 ~ 320 Bolts, nuts paired
| Bolt material | 40 | 40MnB | 35CrMoA | 40 | 35CrMo |
| Nut material | 35 | 40Mn | 40Cr | 25 | 20CrMo |
| Remarks | JB / T 2773 JB / T 2775 | Sinopec pipeline equipment | |||
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