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采用以下牌号的钢材
| 标准 |
牌号 |
C |
Si |
Mn |
P≤ |
S≤ |
Cr≤ |
Ni≤ |
Cu≤ |
| GB/T 3094 |
10 |
0.07-0.13 |
0.17-0.37 |
0.35-0.65 |
0.035 |
0.035 |
0.15 |
0.30 |
0.25 |
| 20 |
0.17-0.23 |
0.17-0.37 |
0.35-0.65 |
0.035 |
0.035 |
0.25 |
0.30 |
0.25 |
| 35 |
0.32-0.39 |
0.17-0.37 |
0.50-0.80 |
0.035 |
0.035 |
0.25 |
0.30 |
0.25 |
| 45 |
0.42-0.50 |
0.17-0.37 |
0.50-0.80 |
0.035 |
0.035 |
0.25 |
0.30 |
0.25 |
| Q195A |
0.06-0.12 |
≤0.30 |
0.25-0.50 |
0.045 |
0.050 |
— |
— |
— |
| Q215A |
0.09-0.15 |
≤0.30 |
0.25-0.55 |
0.045 |
0.050 |
— |
— |
— |
| Q235A |
0.14-0.22 |
≤0.30 |
0.30-0.65 |
0.045 |
0.050 |
— |
— |
— |
| Q295A |
≤0.16 |
≤0.55 |
0.80-1.50 |
0.045 |
0.045 |
— |
— |
— |
| Q345A |
≤0.20 |
≤0.55 |
1.00-1.60 |
0.045 |
0.045 |
— |
— |
— |
| Q390A |
≤0.20 |
≤0.55 |
1.00-1.60 |
0.045 |
0.045 |
— |
— |
— |
| DIN 1629 |
St37.0 |
≤0.17 |
0.17-0.37 |
0.35-0.65 |
0.035 |
0.035 |
0.25 |
0.25 |
0.25 |
| St44.0 |
≤0.21 |
0.17-0.37 |
0.50-0.80 |
0.035 |
0.035 |
0.25 |
0.25 |
0.25 |
| St55 |
0.33-0.41 |
0.17-0.37 |
0.50-0.80 |
0.035 |
0.035 |
0.25 |
0.25 |
0.25 |
| St52.0 |
≤0.22 |
≤0.55 |
≤1.60 |
0.035 |
0.035 |
0.25 |
0.25 |
0.25 |
| CK45 |
0.42-0.50 |
0.17-0.37 |
0.50-0.80 |
0.035 |
0.035 |
0.25 |
0.25 |
0.25 |
注：经协商，也可供应其他牌号的钢管
规格及尺寸偏差
| 钢管尺寸(mm) |
允许偏差 |
| 普通级 |
高级 |
| 边长 |
≤30 |
±0.30 |
±0.20 |
| >30~50 |
±0.40 |
±0.30 |
| >50~75 |
±0.80% |
±0.70% |
| >75 |
±1.00% |
±0.80% |
| 壁厚 |
≤1 |
±0.18 |
±0.12 |
| >1~3 |
+15% -10% |
+12.5% -10.0% |
| >3 |
+12.5% -10.0% |
±10% |
外圆角半径
| 壁厚S |
S≤6 |
6<S≤10 |
S>10 |
| 外圆角半径R |
≤2.0S |
≤2.5S |
≤3.0S |
边凹凸度
| 边长尺寸 |
边凹凸度 min |
| 普通级 General |
高级 High |
| ≤30 |
0.20 |
0.10 |
| 30~50 |
0.30 |
0.15 |
| 50~75 |
0.80% |
0.50% |
| >75 |
0.90% |
0.60% |
弯曲度
| 精度等级 |
弯曲度mm/m |
总弯曲度 % |
| 普通级 |
≤4.0 |
≤0.4 |
| 高级 |
≤2.0 |
≤0.2 |
| 注：精度等级应在合同中注明，如未注明则按普通级交货。 |
扭转值
| 钢管边长mm |
允许扭转值mm/m |
| ≤30 |
≤1.5 |
| 30~50 |
≤2.0 |
| 50~75 |
≤2.5 |
| >75 |
≤3.0 |
力学性能
| 标准 |
钢号 |
抗拉强度σb（Mpa） |
屈服点σs（Mpa） |
断后延伸率 δ5％ |
| Min. |
| GB/T 3094 |
10 |
335 |
205 |
24 |
| 20 |
390 |
245 |
20 |
| 35 |
510 |
305 |
17 |
| 45 |
590 |
335 |
14 |
| Q195 |
315 |
195 |
22 |
| Q215 |
335 |
215 |
22 |
| Q235 |
375 |
235 |
20 |
| Q295 |
430 |
295 |
22 |
| Q345 |
510 |
315 |
21 |
| Q390 |
530 |
390 |
18 |
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