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|
鋼管種類 |
鋼管尺寸
mm |
允許偏差 | |||
|
普通級 |
高級 | ||||
|
熱軋(擠)管 |
外徑
D |
≤159 |
+1.0%(最小值為+0.5mm) |
+0.75%(最小值為+0.3mm) | |
|
>159 |
+1.0% |
+0.90% | |||
|
壁厚
S |
<3.5 |
+15%(最小值為+0.48mm)
-10% (最小值為-0.32mm) |
+1.0%(最小值為+0.2mm) | ||
|
3.5~20 |
+15%
-10% |
+10% | |||
|
>20 |
D<219 |
+10% |
+7.5% | ||
|
D≥219 |
+12.5%
-10.0% |
+10% | |||
|
冷拔(軋)管 |
外徑
D |
≤30 |
+0.20mm |
+0.15mm | |
|
>30~50 |
+0.30mm |
+0.25mm | |||
|
>50 |
+0.8% |
+0.6% | |||
|
壁厚
S |
2~3 |
+12%
-10% |
+10% | ||
|
>3 |
+10% |
+7.5% | |||
|
標準 |
牌號/抗拉強度(Mpa) |
屈服強度(Mpa) |
伸長率(%) | |
|
5310-95 |
20G |
410~550 |
≥ 245 |
≥ 24 |
|
25MnG |
≥ 415 |
≥ 240 |
≥ 22 | |
|
15MoG |
450~600 |
≥ 270 |
≥ 22 | |
|
15CrMoG |
440~640 |
≥ 235 |
≥ 21 | |
|
12Cr2MoG |
450~600 |
≥ 280 |
≥ 20 | |
|
12Cr1MoVG |
470~640 |
≥ 255 |
≥ 21 | |
|
標準 |
牌號 |
化學成分 | |||||||||
|
C |
Si |
Mn |
P |
S |
Cr |
Mo |
Cu |
Ni |
| ||
|
GB5310 |
20G |
0.17-0.24 |
0.17-0.37 |
0.35-0.65 |
≤0.030 |
≤0.030 |
/ |
/ |
≤0.20 |
≤0.25 |
/ |
|
20MnG |
0.17-0.24 |
0.17-0.37 |
0.70-1.00 |
≤0.030 |
≤0.030 |
/ |
/ |
≤0.20 |
≤0.25 |
/ | |
|
15MoG |
0.12-0.18 |
0.17-0.37 |
0.40-0.80 |
≤0.030 |
≤0.030 |
/ |
0.25-0.35 |
≤0.20 |
≤0.30 |
/ | |
|
15CrMoG |
0.12-0.18 |
0.17-0.37 |
0.40-0.70 |
≤0.030 |
≤0.030 |
0.80-1.10 |
0.40-0.55 |
≤0.20 |
≤0.30 |
/ | |
|
12Cr2MoG |
0.08-0.15 |
≤0.50 |
0.40-0.70 |
≤0.030 |
≤0.030 |
2.00-2.50 |
0.90-1.20 |
≤0.20 |
≤0.30 |
/ | |
|
12Cr1MoVG |
0.08-0.15 |
0.17-0.37 |
0.40-0.70 |
≤0.030 |
≤0.030 |
0.90-1.20 |
0.25-0.35 |
≤0.20 |
≤0.30 |
0.15-0.35 | |