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Stratified defects From the point of view of the mechanism, it is generally believed that the non-metallic inclusions in the tube blank will destroy the continuity and compactness of the steel tube, and serious inclusions may even cause stratification inside the steel tube. The other is considered to be hydrogen induced cracking, that is, due to hydrogen accumulation in the steel, the internal gas partial pressure of the metal is too high, and a white point is formed in the round tube blank. During the rolling process, the crack propagates and eventually forms a delamination defect.
In addition, the stress generated by the non-uniform deformation of the two-roll oblique piercing piercings can also cause delamination beyond the plastic strength.
45Mn2 steel seamless steel pipe is a high-strength steel pipe, the general yield strength of 700MPa or more, the main purpose of high-strength structural steel pipe.