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1、國(guó)標(biāo)中鋼管的尺寸允許公差國(guó)家標(biāo)準(zhǔn)GB/T14976流體輸送用不銹鋼無(wú)縫管GB13296-91鍋爐、熱交換器用不銹無(wú)縫鋼管冷拔（軋）鋼管公差外徑D尺寸mm普通級(jí)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%表面質(zhì)量鋼管的內(nèi)外表面不得有裂紋、折疊、軋?jiān)?、離層和結(jié)疤存在。這些缺陷完全清除，清除深度不得超過(guò)公稱壁厚的負(fù)偏差，其清理處實(shí)際壁厚不得小于壁厚所允許的最小值。冷拔（
2、軋）鋼管：不大于公稱壁厚的4%（壁厚小于1.4mm的直道允許深度0.05mm），最大深度不大于0.30mm。不超過(guò)壁厚負(fù)偏差的缺陷允許存在。鋼管的內(nèi)外表面不允許有裂紋、折疊、軋折、結(jié)疤、離層和發(fā)紋存在。如有這些缺陷應(yīng)完全清除掉。清除深度不得超過(guò)壁厚的負(fù)偏差，其清除處實(shí)際壁厚不得小于壁厚所允許的最小值。在鋼管內(nèi)外表面上、直道允許深度如下：冷拔（軋）鋼管：不大于壁厚的4%，最大深度不大于0.2mm。不超過(guò)壁厚負(fù)偏差的其他缺陷允許存在。外徑允許偏差6～10±0.20D>10～30±0.30D>30～50±0.40D>50公稱直徑×0.9%壁厚允許偏差允許偏差壁厚
3、不均范圍不圓度范圍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±0.220.35φ570.828～30±0.20>30～50±0.30>50公稱直徑×0.8%壁厚允許偏差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
4、.10–0.084.5+0.45–0.450.9+0.11–0.094.7+0.47–0.471.0+0.12–2.0±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.
5、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
6、.761.4+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+0.8
7、5–0.852.8+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+0.92-0.923.3+0.33–0.3310+1.00–1.003.4+0.34–0.3412+1.20–1.203.5+0.35–0.3514+1.40–1.40
