型钢的牌号和化学成分
|
牌号 |
化学成分（质量分数）（%） |
|||||
|
C |
Si |
Mn |
V |
P |
S |
|
|
≤ |
||||||
|
16MnK |
0.12"-' 0.20 |
0.20"-'0.55 |
1.20"-'1.60 |
|
0.045 |
0.045 |
|
20MnK |
0.15"-' 0.26 |
0.20"-'0.60 |
1.20"-'1.60 |
|
0.050 |
0.050 |
|
25MnK |
0.21"-' 0.31 |
0.20"-'0.60 |
1.20"-'1.60 |
|
0.050 |
0.050 |
|
20MnVK |
0.17"-' 0.24 |
0.17"-'0.37 |
1.20"-'1.60 |
0.07"-'0.20 |
0.045 |
0.045 |
|
25MnVK |
0.22"-' 0.30 |
0.50"-'0.90 |
1.30"-'1.60 |
0.06"-'0.13 |
0.050 |
0.050 |
型钢的力学和工艺性能
|
牌号 |
屈服点 s/MPa |
抗拉强度 h/MPa |
伸长率 (%) |
冷弯180° d=弯心直径 a=试样厚度 |
|
≥ |
||||
|
16MnK |
325 |
490 |
21 |
d=3a |
|
20MnK |
335 |
490 |
16 |
|
|
25MnK |
335 |
520 |
16 |
|
|
20MnVK |
390 |
570 |
14 |
|
|
25NnVK |
490 |
635 |
18 |
|
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