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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+0.50mm) |
+1.0%(最小值為+0.5mm) |
|
>159 |
+1.0% |
+1.0% | ||
|
壁厚
S |
≤20 |
+15%(最小值為+0.45mm)
-12.5%(最小值為-0.35mm) |
+1.0%(最小值為+0.30mm) | |
|
>20 |
+12.5% |
+10% | ||
|
D≥351熱擴鋼管 |
+15% | |||
|
冷拔(軋)管 |
外徑
D |
10~30 |
+0.40mm |
+0.20mm |
|
>30~50 |
+0.45mm |
+0.25mm | ||
|
>50 |
+1.0% |
+0.75% | ||
|
壁厚
S |
1.5~3.0 |
+15%
-10% |
+10% | |
|
>3.0 |
+12.5%
-10% |
+10% | ||
|
標準（zhǔn） |
牌號 |
抗拉強度(MPa) |
屈服（fú）強度(MPa) |
伸長率(％) |
|
GB3087 |
10 |
335-475 |
≥195 |
≥24 |
|
20 |
410-550 |
≥245 |
≥20 |
|
標準 |
牌號 |
化學成分 | |||||||||
|
C |
Si |
Mn |
P |
S |
Cr |
Mo |
Cu |
Ni |
V | ||
|
GB3087 |
10 |
0.07-0.14 |
0.17-0.37 |
0.35-0.65 |
≤0.035 |
≤0.035 |
≤0.15 |
/ |
≤0.25 |
≤0.25 |
/ |
|
20 |
0.17-0.24 |
0.17-0.37 |
0.35-0.65 |
≤0.035 |
≤0.035 |
≤0.25 |
/ |
≤0.25 |
≤0.25 |
/ | |
| ||