一、前言已经知道,含磷量低于0.01％的低磷不锈钢对于应力腐蚀裂纹和焊接热裂纹等是有效的。但是,由于铬的率先氧化,要用常规的氧化精炼法去降低磷含量是困难的。因此研究了一种特殊的脱磷方法,这方法又可以分为下述两种:一种是弱氧化性脱磷法,采用的炉渣含有Li_2CO_3、Na_2CO_3或BaO,主要是其碱度较CaO更高而熔点则较低;另一 I. Preface It is already known that low-phosphorus stainless steels containing less than 0.01% phosphorus are effective for stress corrosion cracking and weld hot cracking. However, due to the first oxidation of chromium, it is difficult to reduce the phosphorus content by a conventional oxidation refining method. Therefore, a special method for dephosphorization has been studied. This method can be divided into the following two types: one is a weakly oxidizing dephosphorization method, and the slag used contains Li 2 CO 3, Na 2 CO 3 or BaO mainly because its basicity is more than that of CaO High while the melting point is lower; the other