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无缝管按GB/T8162-87规定，规格：热轧管外径32～630mm。壁厚2.5～75mm。冷轧(冷拔)管外径5～200mm。壁厚2.5～12mm。
无缝钢管的重量计算公式是：
m=F×L×ρ  
m—质量 Kg ；F—断面积m2/m ；L—长度m ； ρ—密度 *Kg/m3
其中：F断面积计算方法：  
1、方钢      F= a2    
2、钢管     F=3.1416×＄（D-＄）     D—直径      ＄—厚度  
3、钢板、扁钢   F= a×＄            a—宽度 

Seamless pipe according to GB / T8162-87 specification: hot-rolled pipe outside diameter 32 ~ 630mm. Wall thickness 2.5 ~ 75 mm. External diameter of cold-rolled and cold-drawn pipe 5ー200 mm. Wall thickness 2.5 ~ 12 mm. The formula for calculating the weight of seamless steel pipe is as follows: (m)(m)(m)(m)(m)(m)(m)(m)(m)(m)(m)(m)(F)(m)(m)(m)(F)(m)(m)(m) The calculation method of f section area is as follows: 1. Square steel F A 22, steel tube F 3.1416 $(D-$) D diameter ———— Thickness 3, steel plate and flat steel F A $A -- width