冷轧(拔)无缝钢管除分一般钢管、低中压锅炉钢管、高压锅炉钢管、合金钢管、不锈钢管、石油裂化管、其它钢管外，还包括碳素薄壁钢管、合金薄壁钢管、不锈薄壁钢管、异型钢管。热轧无缝管外径一般大于32mm，壁厚2.5-75mm，冷轧无缝钢管内径可以到6mm，壁厚可到0.25mm，薄壁管外径可到5mm，壁厚小于0.25mm，冷轧比热轧尺寸精度高。

Cold-rolled (drawn) seamless steel pipes are divided into general steel pipes, low and medium pressure boiler pipes, high pressure boiler pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, other steel pipes, including carbon thin-walled steel pipes, alloy thin-walled steel pipes, stainless steel thin-walled steel pipes, profiled steel pipes. The outer diameter of hot-rolled seamless pipe is generally larger than 32mm, the wall thickness is 2.5-75mm, the inner diameter of cold-rolled seamless pipe can reach 6mm, the wall thickness can reach 0.25mm, the outer diameter of thin-walled pipe can reach 5mm, the wall thickness is less than 0.25mm, and the dimension precision of cold-rolled pipe is higher than that of hot-rolled pipe.

异型管是经冷拔制成各种异型的无缝钢管。异型管一般是根据断截面来区分的，按材料来说又可分为无缝钢管异型管，铝合金异型管，塑料异型管。

The special-shaped tube is made of cold drawn various special-shaped seamless steel tubes. Special-shaped pipe is generally divided according to the broken section, according to the material can be divided into seamless steel tube special-shaped pipe, aluminum alloy special-shaped pipe, plastic special-shaped pipe.

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