热轧圆钢65Mn 45Mn 25Mn圆钢 莱钢高强度钢
优质碳素结构钢的牌号和化学成分
牌号
|
化学成分(质量分数)(%)
|
|||||||
C
|
Si
|
Mn
|
Cr
|
M
|
Cu
|
|||
≤
|
||||||||
20Mn
|
0.17~O.23
|
O.17~O.37
|
O.70~1.00
|
O.25
|
0.30
|
O.25
|
||
25Mn
|
O.22~O.29
|
0.17~0.37
|
O.70~1.00
|
O.25
|
O.30
|
O.25
|
||
30Mn
|
0.27~O.34
|
O.17~0.37
|
0.70~1.00
|
O.25
|
O.30
|
0.25
|
||
35Mn
|
O.32~O.39
|
O.17~O.37
|
O.70~1.00
|
0.25
|
O.30
|
O.25
|
||
40Mn
|
O.37~0.44
|
O.17~0.37
|
O.70~1.00
|
0.25
|
0.30
|
O.25
|
||
45Mn
|
0.42~0.50
|
0.17~O.37
|
0.70~1.00
|
O.25
|
O.30
|
O.25
|
||
50Mn
|
O.48~0.56
|
O.17~O.37
|
O.70~1.00
|
0.25
|
0.30
|
0.25
|
||
60Mn
|
0.57~0.65
|
O.17~O.37
|
0.70~1.00
|
0.25
|
0.30
|
0.25
|
||
65Mn
|
0.62~0.70
|
0.17~O.37
|
O.90~1.20
|
O.25
|
0.30
|
0.25
|
||
70Mn
|
0.67~O.75
|
0.17~0.37
|
0.90~1.20
|
O.25
|
O.30
|
O.25
|