由于高Mn非磁性钢比奥氏体不锈钢具有更好的强度和稳定的磁性特性,所以适宜用于线性电机和核熔炉的制造。然而,一般的高Mn钢加工硬化性高,致使该钢的切削加工性特别是可钻削性变劣。为了解决这一问题,日本神户制钢公司加古川钢厂研制开发了一种易切削型高Mn非磁性钢板(KNM295-M)。它具有优良的可钻削性、稳定的磁性特性且强度高达295 N/mm~2级,在实际应用中取得了良好的成绩。 KNM295-M钢板的主要化学成分(wt％)为:C0.24;Si 0.26;Mn 24.56;P 0.013;S 0.001;Cr 4.93。 Because of their better strength and stable magnetic properties than austenitic stainless steels, high-Mn non-magnetic steels are suitable for use in the manufacture of linear motors and nuclear furnaces. However, the general high-Mn steel has high work hardening properties, resulting in deterioration of machinability of the steel, in particular, corrosivity to the steel. In order to solve this problem, Kakogawa Steel Co., Ltd., Japan’s Kobe Steel Company, has developed a free-cutting high-Mn non-magnetic steel sheet (KNM295-M). It has excellent drillability, stable magnetic properties and strength of up to 295 N / mm ~ 2, in the practical application has achieved good results. The main chemical composition (wt%) of KNM295-M steel plate is: C0.24; Si 0.26; Mn 24.56; P 0.013; S 0.001; Cr 4.93.