钢管的理论重量按如下公式计算:
W=∏p(D-S)S/1000
式中:
W---钢管的理论重量,单位为千克每米(kg/m);
∏=3.1416;
p---钢的密度,单位为千克每立方分米(kg/dm3),;
D---钢管的公称外径;单位为毫米(mm);
S---钢管的公称壁厚,单位为毫米(mm)。
执行该标准的无缝钢管种类如下:
GB/T 8162-2008 结构用无缝钢管(seamless steel tubes for structural purposes)
GB/T 8163-2008 流体输送用无缝钢管(seamless steel tubes for liquid service)
GB/T 9948-2006 石油裂化用无缝钢管(seamless steel tubes for petroleum cracking)(表1和表3)
GB/T 3087-2008 低中压锅炉用无缝钢管(seamless steel tubes for low and medium pressure boiler)
GB/T 6479-2000 高压化肥设备用无缝钢管(seamless steel tubes for high-pressure for chemical fertilizer equipments)
(外径为14mm-426mm,壁厚不大于45mm)
GB/T 5312-2009 船舶用碳钢和碳锰钢无缝钢管(carbon and carbon-manganese steel seamless steel tubes and pipes for ship)
(表1中系列1)
GB 18248-2008 气瓶用无缝钢管(Seamless steel tubes for gas cylinder)