No.
|
Steel grade
|
Chemical composition
|
|
|
||
|
|
C
|
Si
|
Mn
|
||
1
|
45
|
0.42-0.50
|
0.17-0.37
|
0.50-0.80
|
||
2
|
50
|
0.47-0.55
|
|
|
||
3
|
55
|
0.52-0.60
|
|
|
||
4
|
60
|
0.57-0.65
|
|
|
||
5
|
65
|
0.62-0.70
|
|
|
||
6
|
70
|
0.67-0.75
|
|
|
||
7
|
65Mn
|
0.62-0.70
|
|
0.90-1.20
|
||
8
|
72A
|
0.70-0.75
|
0.15-0.35
|
0.30-0.60
|