由整块金属制成的，表面上没有接缝的钢管，称为无缝钢管。根据生产方法，无

由整块金属制成的，表面上没有接缝的钢管，称为无缝钢管。根据生产方法，无缝管分热轧管、冷轧管、冷拔管、挤压管、顶管等。按照断面形状，无缝钢管分圆形和异形两种，异形管有方形、椭圆形、三角形、六角形、瓜子形、星形、 带翅管多种复杂形状。最大直径达650mm，最小直径为 0.3mm。根据用途不同， 有厚壁管和薄壁管。无缝钢管主要用做石油地质钻探管、石油化工用的裂化管、锅 炉管、轴承管以及汽车、拖拉机、航空用高精度结构钢管。

由整块金属制成的，表面上没有接缝的钢管，称为无缝钢管。根据生产方法，无缝管分热轧管、冷轧管、冷拔管、挤压管、顶管等。按照断面形状，无缝钢管分圆形和异形两种，异形管有方形、椭圆形、三角形、六角形、瓜子形、星形、 带翅管多种复杂形状。最大直径达650mm，最小直径为 0.3mm。根据用途不同， 有厚壁管和薄壁管。无缝钢管主要用做石油地质钻探管、石油化工用的裂化管、锅 炉管、轴承管以及汽车、拖拉机、航空用高精度结构钢管。<br>

A steel pipe made of a whole piece of metal without seams on its surface is called a seamless steel pipe. According to the production method, seamless pipes are divided into hot tube, cold-rolled pipes, cold-drawn pipes, extruded pipes, jacking pipes, etc. According to the cross-sectional shape, seamless steel pipes are divided into round and special-shaped pipes, and special-shaped pipes have many complex shapes such as square, oval, triangle, hexagon, melon seeds, star and finned pipes. The maximum diameter is 650mm and the minimum diameter is 0.3mm .. According to different uses, there are thick-walled tubes and thin-walled tubes. Seamless steel pipes are mainly used as drilling pipes for petroleum geology, cracking pipes for petrochemical industry, boiler tubes, bearing pipes and high-precision structural steel pipes for automobiles, tractors and aviation.