一前言偏析线断口是五十年代由苏联碱-酸性平炉双联矽还原法冶炼的钢(以下称酸性平炉钢)沿用过来的一种低倍断口缺陷。近年来,由于我国炼钢技术的飞速发展,也采用了其他方法生产优质钢,用这些方法生产的钢,在低倍断口上出现了所谓偏析线或类似偏析线的缺陷。因此,在断口评级和材料交验时,引起了人们的争议,争论的焦点之一是用酸性平炉和其他冶金方法生产的钢中,出现的偏析线一词含义是否确切, A foreword segregation line fracture is the fifties by the Soviet Union alkali - acid hearth double silicon reduction method smelting steel (hereinafter referred to as acidic open hearth steel) came from a low-fold fracture defects. In recent years, due to the rapid development of steelmaking technology in our country, other methods have also been adopted to produce high-quality steel. The steel produced by these methods shows the so-called segregation lines or similar segregation lines on the low magnification fracture. As a result, there has been controversy over fracture rating and material inspection, and one of the focal points of the debate is whether the term segregation lines appearing in steels produced using acid hearth furnaces and other metallurgical methods is accurate,