| 牌号 | 20MB5 |
|---|---|
| 对应标准 | NF A 35-557-1983
钢铁机械制造用高性能外螺纹紧固件用热处理钢 |
| 归类 | 合金钢 |
| 性能 | 强度 |
| 标签 | 硼钢 |
| 说明 | 用于制造机械工程用高强度外螺纹紧固件。 |
-
不同等级螺栓对应的硬度、油淬火棒材芯部硬度与碳含量关系表
棒材在油淬火状态下获得的硬度与钢碳含量之间的关系，以便在回火后获得与不同等级螺栓对应的硬度(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)螺栓等级 等级对应的硬度 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：数据仅供参考！如有疑问，请填写"我要纠错"！