收藏词条 编辑词条 中国冷鐓、冷挤压钢钢号
冷镦和冷挤压用钢包括非热处理、表面硬化、调质型三类。热轧盘条钢直径5～40mm，热轧圆钢直径12～100mm。除检验化学成分和力学性能之外，还要做冷顶锻、脱碳深度、酸浸低倍检验。执行GB／T 6478。热轧状态交货。
1 非热处理钢
a 牌号及化学成分见表一。
GB／T 6478 表一
|
牌号 |
化学成分（质量分数）/% |
|||||
|
C |
Si<= |
Mn |
P<= |
S<= |
Alt>= |
|
|
ML04Al |
<=0.06 |
0.1 |
0.2-0.4 |
0.035 |
0.035 |
0.02 |
|
ML08Al |
0.05-0.1 |
0.1 |
0.3-0.6 |
0.035 |
0.035 |
0.02 |
|
ML10Al |
0.08-0.13 |
0.1 |
0.3-0.6 |
0.035 |
0.035 |
0.02 |
|
ML15Al |
0.13-0.18 |
0.1 |
0.3-0.6 |
0.035 |
0.035 |
0.02 |
|
ML15 |
0.13-0.18 |
0.15-0.35 |
0.3-0.6 |
0.035 |
0.035 |
|
|
ML20Al |
0.18-0.23 |
0.1 |
0.3-0.6 |
0.035 |
0.035 |
0.02 |
|
ML20 |
0.18-0.23 |
0.15-0.35 |
0.3-0.6 |
0.035 |
0.035 |
|
b 力学性能见表二
表二
|
牌号 |
σb/Mpa<= |
ψ/%>= |
|
ML04Al |
440 |
60 |
|
ML08Al |
470 |
60 |
|
ML10Al |
490 |
55 |
|
ML15Al |
530 |
50 |
|
ML15 |
530 |
50 |
|
ML20Al |
580 |
45 |
|
ML20 |
580 |
45 |
2 表面硬化钢
牌号段化学成分见表三。
GB/T 6478 表三
|
牌号 |
化学成分（质量分数）/% |
||||||
|
C |
Si<= |
Mn |
P<= |
S<= |
Cr |
Alt>= |
|
|
ML18Mn |
0.15-0.2 |
0.1 |
0.6-0.9 |
0.03 |
0.035 |
|
0.02 |
|
ML22Mn |
0.18-0.23 |
0.1 |
0.7-1 |
0.03 |
0.035 |
|
0.02 |
|
ML20Cr |
0.17-0.23 |
0.3 |
0.6-0.9 |
0.035 |
0.035 |
0.9-1.2 |
0.02 |
3 调质钢
a．牌号及化学成分见表四。
G/T 6478 表四
|
牌号 |
化学成分（质量分数）/% |
|||||||||
|
C |
Si<= |
Mn |
P<= |
S<= |
Cr |
Mo |
B |
Alt>= |
其它 |
|
|
ML25 |
0.22-0.29 |
0.2 |
0.3-0.6 |
0.035 |
0.035 |
|
|
|
|
|
|
ML30 |
0.27-0.34 |
0.2 |
0.3-0.6 |
0.035 |
0.035 |
|
|
|
|
|
|
ML35 |
0.32-0.39 |
0.2 |
0.3-0.6 |
0.035 |
0.035 |
|
|
|
|
|
|
ML40 |
0.37-0.44 |
0.2 |
0.3-0.6 |
0.035 |
0.035 |
|
|
|
|
|
|
ML45 |
0.42-0.5 |
0.2 |
0.3-0.6 |
0.035 |
0.035 |
|
|
|
|
|
|
ML15Mn |
0.14-0.2 |
0.2-0.4 |
1.2-1.8 |
0.035 |
0.035 |
|
|
|
|
|
|
ML25Mn |
0.22-0.29 |
0.25 |
0.6-0.9 |
0.035 |
0.035 |
|
|
|
|
|
|
ML30Mn |
0.27-0.34 |
0.25 |
0.6-0.9 |
0.035 |
0.035 |
|
|
|
|
|
|
ML37Cr |
0.34-0.41 |
0.3 |
0.6-0.9 |
0.035 |
0.035 |
0.9-1.2 |
|
|
|
|
|
ML40Cr |
0.38-0.45 |
0.3 |
0.6-0.9 |
0.035 |
0.035 |
0.9-1.2 |
|
|
|
|
|
ML30CrMo |
0.26-0.34 |
0.3 |
0.6-0.9 |
0.035 |
0.035 |
0.8-1.1 |
0.15-0.25 |
|
|
|
|
ML35CrMo |
0.32-0.4 |
0.3 |
0.6-0.9 |
0.035 |
0.035 |
0.8-1.1 |
0.15-0.25 |
|
|
|
|
ML42CrMo |
0.38-0.45 |
0.3 |
0.6-0.9 |
0.035 |
0.035 |
0.9-1.2 |
0.15-0.25 |
|
|
|
|
ML20B |
0.17-0.24 |
0.4 |
0.5-0.8 |
0.035 |
0.035 |
|
|
0.0005-0.0035 |
0.02 |
|
|
ML28B |
0.25-0.32 |
0.4 |
0.6-0.9 |
0.035 |
0.035 |
|
|
0.0005-0.0035 |
0.02 |
|
|
ML35B |
0.32-0.39 |
0.4 |
0.5-0.8 |
0.035 |
0.035 |
|
|
0.0005-0.0035 |
0.02 |
|
|
ML15MnB |
0.14-0.2 |
0.3 |
1.2-1.6 |
0.035 |
0.035 |
|
|
0.0005-0.0035 |
0.02 |
|
|
ML20MnB |
0.17-0.24 |
0.4 |
0.8-1.2 |
0.035 |
0.035 |
|
|
0.0005-0.0035 |
0.02 |
|
|
ML35MnB |
0.32-0.39 |
0.4 |
1.1-1.4 |
0.035 |
0.035 |
|
|
0.0005-0.0035 |
0.02 |
|
|
ML37CrB |
0.34-0.41 |
0.4 |
0.5-0.8 |
0.035 |
0.035 |
|
|
0.0005-0.0035 |
0.02 |
Cr0.2-0.4 |
|
ML20MnTiB |
0.19-0.24 |
0.3 |
1.3-1.6 |
0.035 |
0.035 |
|
|
0.0005-0.0035 |
0.02 |
Ti0.04-0.1 |
|
ML15MnVB |
0.13-0.18 |
0.3 |
1.2-1.6 |
0.035 |
0.035 |
|
|
0.0005-0.0035 |
0.02 |
V0.07-0.12 |
|
ML20MnVB |
0.19-0.24 |
0.3 |
1.2-1.6 |
0.035 |
0.035 |
|
|
0.0005-0.0035 |
0.02 |
V0.07-0.12 |
b．力学性能(只检验退火状态)见表五
表五
|
牌号 |
σb/Mpa<= |
ψ/%<= |
|
ML10Al |
450 |
65 |
|
ML15Al |
470 |
64 |
|
ML15 |
470 |
64 |
|
ML20Al |
490 |
63 |
|
ML20 |
490 |
63 |
|
ML20Cr |
560 |
60 |
|
ML25Mn |
540 |
60 |
|
ML30Mn |
550 |
59 |
|
ML35Mn |
560 |
58 |
|
ML37Cr |
600 |
60 |
|
ML40Cr |
620 |
58 |
|
ML20B |
500 |
64 |
|
ML28B |
530 |
62 |
|
LM35B |
570 |
62 |
|
ML20MnB |
520 |
62 |
|
ML35MnB |
600 |
60 |
|
ML37CrB |
600 |
60 |