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一、前言 30CrMnSiA钢是一个老钢种,在工业上有着广泛的用途,近年来随着国防工业的日益发展,对钢材的质量要求越来越严格,技术标准要求氧化物和硫化物夹杂都小于1.5级,从而使大生产的合格率大大降低。几年来,为了提高钢的合格率,上钢五厂曾作了不少工作并取得一些进展,尽管如此,钢的合格率仍处在很低水平。因由于夹杂物和断口“偏析线”不合造成许多废品,在有缺陷的断口中“偏析线”是主要的,经
I. Introduction 30CrMnSiA steel is an old steel that has a wide range of uses in industry. In recent years, as the development of the national defense industry progresses, the quality requirements of steel have become more and more stringent. Technical standards require that oxides and sulfide inclusions be less than 1.5, so that the pass rate of large-scale production greatly reduced. In recent years, in order to improve the passing rate of steel, the No. 5 Steel Works has made a lot of work and made some progress, however, the pass rate of steel is still at a very low level. As a result of inclusions and fracture “segregation line” does not produce a lot of waste, fault fracture in the “segregation line” is the main, by