国标无缝钢管尺寸外形重量及偏差

国标无缝钢管尺寸、外形、重量及偏差国家标准摘要国家标准GB/T14976

流体输送用不锈钢无缝管

GB13296-91

锅炉、热交换器用不锈无缝钢管冷拔（轧）钢管公差外径D尺寸mm普通级尺寸mm6～10±0.20

>10～30±0.30

>30～50±0.40

>50

±0.90%8～30

±0.20

>30～50±0.30

>50

±0.80%

壁厚S≤3

±14%S

>3

+12.5%S

-10%S1.0～3.0

+12%

>3.0

-10%

±10%

表面质量钢管的内外表面不得有裂纹、折叠、轧扎、离层和结疤存在。这些缺陷完全清除，清除深度不得超过公称壁厚的负偏差，其清理处实际壁厚不得小于壁厚所允许的最小值。

冷拔（轧）钢管：不大于公称壁厚的4%（壁厚小于1.4mm的直道允许深度0.05mm），最大深度不大于0.30mm。

不超过壁厚负偏差的缺陷允许存在。

钢管的内外表面不允许有裂纹、折叠、轧折、结疤、离层和发纹存在。如有这些缺陷应完全清除掉。清除深度不得超过壁厚的负偏差，其清除处实际壁厚不得小于壁厚所允许的最小值。

在钢管内外表面上、直道允许深度如下：

冷拔（轧）钢管：不大于壁厚的4%，最大深度不大于0.2mm。不超过壁厚负偏差的其他缺陷允许存在。外径允许偏差6～10

±0.20

D>10～30

±0.30

D>30～50

±0.40

D>50

公称直径×0.9%壁

厚

允

许

偏

差允许偏差壁厚不均范围不圆度范围0.5±0.070.11φ320.640.6±0.080.13φ350.640.8±0.110.18φ380.641.0±0.140.22φ420.641.2±0.170.27φ450.641.4±0.200.32φ480.641.5±0.210.34φ500.641.6±0.220.35φ570.822.0±0.280.45φ600.862.2±0.300.48φ620.892.5±0.350.56φ701.012.7±0.380.61φ741.063.0±0.420.67φ761.093.2+0.40–0.320.58φ801.153.5+0.440.350.63φ851.224.0+0.50-0.400.72φ891.284.5+0.56–0.450.81φ901.305.0+0.63–0.500.90φ951.375.5+0.68–0.550.98φ1081.566.0+0.75–0.601.08φ1141.646.5+0.81–0.651.17φ1331.927.0+0.88–0.701.26φ1592.297.5+0.93–0.751.34φ1682.428.0+1.0–0.81.44φ1802.598.5+1.06–0.851.53φ2193.159.0+1.12–0.901.66φ2733.939.5+1.17–0.951.71φ3254.6810+1.25–1.001.80φ4266.1312+1.50–1.202.16φ5808.3514+1.75–1.402.52φ6108.768～30±0.20

>30～50±0.30

>50

公称直径×0.8%

壁

厚

允

许

偏

差0.5+0.06–0.053.8+0.38–0.380.6+0.07–0.054.0+0.40–0.400.7+0.080.074.2+0.42–0.420.8+0.10–0.084.5+0.45–0.450.9+0.11–0.094.7+0.47–0.471.0+0.12–0.105.0+0.50–0.501.1+0.13–0.115.2+0.52–0.521.2+0.14–0.125.5+0.55–0.551.3+0.16–0.135.8+0.58–0.581.4+0.17–0.146.0+0.60–0.601.5+0.18–0.156.2+0.62–0.621.6+0.19–0.166.3+0.63–0.631.8+0.22–0.186.5+0.65–0.652.0+0.24–0.206.8+0.68–0.682.1+0.25–0.217.0+0.70–0.702.2+0.26–0.227.2+0.72–0.722.3+0.28–0.237.5+0.75–0.752.5+0.30–0.258.0+0.80–802.6+0.31–0.268.2+0.82–0.822.7+0.32–0.278.5+0.85–0.852.8+0.34–0.288.8+0.88–0.883.0+0.36–0.309.0+0.90–0.903.2+0.32–0.329.2+0