冷軋(拔)無(wú)縫鋼管除分一般鋼管、低中壓鍋爐鋼管、高壓鍋爐鋼管、合金鋼管、不銹鋼管、石油裂化管、其它鋼管外，還包括碳素薄壁鋼管、合金薄壁鋼管、不銹薄壁鋼管、異型鋼管。熱軋無(wú)縫管外徑一般大于32mm，壁厚2.5-75mm，冷軋無(wú)縫鋼管內(nèi)徑可以到6mm，壁厚可到0.25mm，薄壁管外徑可到5mm，壁厚小于0.25mm，冷軋比熱軋尺寸精度高。

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.

異型管是經(jīng)冷拔制成各種異型的無(wú)縫鋼管。異型管一般是根據(jù)斷截面來(lái)區(qū)分的，按材料來(lái)說(shuō)又可分為無(wú)縫鋼管異型管，鋁合金異型管，塑料異型管。

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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