| 分类与代号 |
分 类 |
代 号 |
| 非切削加工用钢 |
UNC |
|
| 切削加工用钢 |
UC |
|
| 热压力加工用钢 |
UHP |
|
| 冷或热顶锻用钢 |
UF |
|
| 尺寸、外形 |
冷拉钢材的尺寸、外形及答应偏差应符合GB/T905的规定 |
|
| 磨光钢材的尺寸、外形及答应偏差应符合GB/T3207的规定 |
||
| 牌号和化学成分 |
优质碳素结构钢应符合GB/T699的规定，合金结构钢应符合GB/T3077的规定 |
| 牌号 |
化学成分质量分数)(%) |
|||||
| C |
Si |
Mn |
S |
P |
Cr |
|
| ≤ |
||||||
| lOF |
0.07～0.13 |
O.03 |
0.50 |
O.035 |
0.O35 |
|
| 15F |
O.12～0.18 |
O.07 |
0.50 |
0.035 |
O.035 |
|
| 20F |
O.17～O.24 |
0.07 |
O.50 |
O.∞5 |
0.035 |
|
| 30 |
O.27～O.34 |
0.20 |
O.60 |
O.035 |
0.035 |
|
| 35 |
0.32～O.39 |
O.20 |
0.60 |
0.035 |
O.035 |
|
| 40 |
0.37～0.44 |
0.20 |
0.60 |
0.035 |
O.035 |
|
| 45 |
O.42～0.49 |
O.20 |
0.60 |
O.035 |
O.035 |
|
| 40Cr |
O.34～O.42 |
O.20 |
O.50～0.80 |
O.035 |
O.035 |
0.80～1.10 |
| 序号 |
牌号 |
交货状态硬度HBS≤ |
|
| 冷拉 |
退火、高温回火或正火后回火 |
||
| 1 |
lO |
229 |
179 |
| 2 |
15 |
229 |
179 |
| 3 |
20 |
229 |
179 |
| 4 |
25 |
229 |
179 |
| 5 |
30 |
229 |
179 |
| 6 |
35 |
241 |
187 |
| 7 |
40 |
241 |
207 |
| 8 |
45 |
255 |
229 |
| 9 |
50 |
255 |
229 |
| 10 |
55 |
269 |
241 |
| ll |
60 |
269 |
241 |
| 12 |
65 |
255 |
|
| 13 |
15Mn |
207 |
163 |
| 14 |
20Mn |
229 |
187 |
| 15 |
25Mn |
241 |
197 |
| 16 |
30Mn |
241 |
179 |
| 17 |
35Mn |
255 |
207 |
| 18 |
40Mn |
269 |
217 |
| 19 |
45Mn |
269 |
229 |
| 20 |
50Mn |
269 |
229 |
| 21 |
60Mn |
255 |
|
| 22 |
65Mn |
269 |
|
| 23 |
20Mn2 |
24l |
197 |
| 24 |
35Mn2 |
255 |
207 |
| 25 |
40Mn2 |
269 |
217 |
| 26 |
45Mn2 |
269 |
229 |
| 27 |
50Mn2 |
285 |
229 |
| 28 |
27SiMn |
255 |
217 |
| 29 |
35SiMn |
269 |
229 |
| 30 |
42SiMn |
241 |
|
| 31 |
20MnV |
229 |
187 |
| 32 |
40B |
241 |
207 |
| 33 |
45B |
255 |
229 |
| 34 |
50B |
255 |
229 |
| 35 |
40MnB |
269 |
217 |
| 36 |
45MnB |
269 |
229 |
| 37 |
40MnVB |
269 |
217 |
| 38 |
20SiMnVB |
269 |
217 |
| 39 |
20CrV |
255 |
217 |
| 40 |
40CrVA |
269 |
229 |
| 4l |
45CrVA |
302 |
255 |
| 42 |
38CrSi |
269 |
255 |
| 43 |
20CrMnSiA |
255 |
217 |
| 44 |
25CrMnSiA |
269 |
229 |
| 45 |
30CrMnSiA |
269 |
229 |
| 46 |
35 CrMnSiA |
285 |
241 |
| 47 |
20 CrMnTi |
255 |
207 |
| 48 |
15CrM0 |
229 |
187 |
| 49 |
20CrMo |
24l |
197 |
| 50 |
30CrMo |
269 |
229 |
| 51 |
35CrM0 |
269 |
241 |
| 52 |
42CrM0 |
285 |
255 |
| 53 |
20CrMnM0 |
269 |
229 |
| 54 |
40CrMnM0 |
269 |
24l |
| 55 |
35CrMOVA |
285 |
255 |
| 56 |
38CrMOALA |
269 |
229 |
| 57 |
15CrA |
229 |
179 |
| 58 |
20FCr |
229 |
179 |
| 59 |
30Cr |
241 |
187 |
| 60 |
35Cr |
269 |
217 |
| 61 |
40Cr |
209 |
217 |
| 62 |
45Cr |
269 |
229 |
| 63 |
20CrNi |
255 |
207 |
| 64 |
40CrNi |
255 |
|
| 65 |
45CrNi |
269 |
|
| 66 |
12CrNi2A |
269 |
217 |
| 67 |
12CrNi3A |
269 |
229 |
| 68 |
20CrNi3A |
269 |
241 |
| 69 |
30CrNi3(A) |
255 |
|
| 70 |
37CrNi3A |
269 |
|
| 7l |
12Cr2Ni4A |
255 |
|
| 72 |
20CrNi4A |
269 |
|
| 73 |
40CrNiMoA |
269 |
|
| 74 |
45CrNiMoVA |
269 |
|
| 75 |
18Cr2Ni4WA |
269 |
|
| 76 |
25Cr2Ni4WA |
269 |
15Mn20Mn25Mn30Mn35Mn60Mn20Mn235Mn240Mn245Mn250Mn242SiMn45B40MnB45MnB40MnVB20CrV38CrSi30CrMnSiA35CrM015CrA20CrNi45CrNi30CrNi3(A)37CrNi3A40CrNiMoA45CrNiMoVA25Cr2Ni4WA35CrMnSiA、42CrMo、35CrMoVA的硬度值应符合表中规定。其他牌号的交货状态布氏硬度值应不大于269。
| 序号 |
牌号 |
冷 拉 |
退 火 |
||||
| 抗拉强度 ób/MPa |
伸长率δ5 (%) |
收缩率￠ (%) |
抗拉强度 ód/MPa |
伸长率δ5 (%) |
收缩率Ψ (%) |
||
| ≥ |
≥ |
||||||
| 1 |
10 |
440 |
8 |
50 |
295 |
26 |
55 |
| 2 |
15 |
470 |
8 |
45 |
345 |
23 |
55 |
| 3 |
20 |
510 |
7.5 |
40 |
390 |
2l |
50 |
| 4 |
25 |
540 |
7 |
40 |
410 |
19 |
50 |
| 5 |
30 |
560 |
7 |
35 |
440 |
17 |
45 |
| 6 |
35 |
590 |
6.5 |
35 |
470 |
15 |
45 |
| 7 |
40 |
610 |
6 |
35 |
510 |
14 |
40 |
| 8 |
45 |
635 |
6 |
30 |
540 |
13 |
40 |
| 9 |
50 |
655 |
6 |
30 |
560 |
12 |
40 |
| 10 |
15Mn |
490 |
7.5 |
40 |
390 |
21 |
50 |
| ll |
50Mn |
685 |
5.5 |
30 |
590 |
10 |
35 |
| 12 |
50Mn2 |
735 |
5 |
25 |
635 |
9 |
30 |
| 序号 |
牌号 |
布氏硬度HBS ≤ |
抗拉强度ób/MPa ≤ |
伸长率δ5(%) ≥ |
收缩率Ψ(%) ≥ |
| l |
10 |
131 |
440 |
26 |
60 |
| 2 |
15 |
137 |
470 |
23 |
55 |
| 3 |
35 |
156 |
540 |
18 |
50 |
| 4 |
45 |
163 |
590 |
15 |
50 |
| 5 |
40Cr |
179 |
590 |
14 |
50 |
