| 牌号 | 20MB5 |
|---|---|
| 對應标準 | NF A 35-557-1983
鋼鐵機械制造用高性能外螺紋緊固件用熱處理鋼 |
| 歸類 | 合金鋼 |
| 性能 | 強度 |
| 标簽 | 硼鋼 |
| 說明 | 用于制造機械工程用高強度外螺紋緊固件。 |
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不同等級螺栓對應的硬度、油淬火棒材芯部硬度與碳含量關系表
棒材在油淬火狀态下獲得的硬度與鋼碳含量之間的關系，以便在回火後獲得與不同等級螺栓對應的硬度(The following table gives the correlation between the hardnesses which it is necessary to obtain at the core of the bars at the quenching stage (oil), according to the carbon content of the steel, in order to have after tempering the hardness corresponding to the different classes of bolts)螺栓等級 等級對應的硬度 芯部硬度 油淬火 0.15≤C<0.3 0.3≤C<0.45 8.8 22 HRC 38 HRC 42 HRC 10.9 31 HRC 42 HRC 45 HRC 12.9 38 HRC 45 HRC 48 HRC
注：數據僅供參考！如有疑問，請填寫"我要糾錯"！