钢管是一种良好的受力构件。管材的横向抗弯、纵向抗压的能力最大。钢管的表面积与体积之比非常大,管坯上的任何一点都要向外壁与长度方向伸展,因此,凡是影响钢的均匀性和任何连续性的缺陷都不允许存在。在轧管过程中,金属要承受多次反复的交变应力作用(纵向拉应力及斜向剪应力),若管坯内部质量不良就不能承受这种复杂的应力状态。钢管表面质量取决于管坯 Steel pipe is a good force components. The horizontal bending of the pipe, the maximum longitudinal compression capacity. Steel pipe surface area to volume ratio is very large, any point on the tube to the outer wall and the length of the extension, therefore, any impact on steel uniformity and any continuity defects are not allowed to exist. In the rolling process, the metal to withstand repeated alternating stress (longitudinal tensile stress and oblique shear stress), if the internal quality of the tube can not withstand this complex state of stress. Tube surface quality depends on the tube