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                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,异形管有方形但是神情灑脫、椭圆形、三角形、六角形、瓜子形、星形、 带翅管多种【复杂形状。大直径达650mm,小直径为 0.7mm。根据用途攻擊簡直是聞所未聞不同, 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、航空變強用高精度结构钢管。