成分 |
最小值 |
最大值 |
公称值 |
碳 C |
0.7 |
0.8 |
- |
硅 Si |
- |
0.4 |
- |
锰 Mn |
- |
0.4 |
- |
磷 P |
- |
0.035 |
- |
硫 S |
- |
0.035 |
- |
铬 Cr |
3.75 |
4.5 |
- |
镍 Ni |
- |
0.4 |
- |
铜 Cu |
- |
0.2 |
- |
钼 Mo |
- |
0.7 |
- |
钨 W |
17.5 |
18.5 |
- |
钒 V |
1 |
1.25 |
- |
钴 Co ①
|
- |
1 |
- |
锡 Sn |
- |
0.05 |
- |
①The maximum cobalt levels for BT1 have been increased because of the level of cobalt in the scrap used for manufacture is increased.