一、前言为了降低高温下使用的电站转子钢、化工反应容器钢等的脆化敏感性,减少P、As、Sn、Sb 之类杂质元素的含量是很重要的。在这些元素中,P 可以通过氧化精炼过程而去除。但是,就其余那些元素来说,除了采用超高真空之外,长期以来,都认为无法从钢液中把它们排除。因此,对去除这些杂质元素的研究进行得极少,而对于高纯钢的生产,似乎只有精选废钢一法。然而,在一系列对高Cr 钢进行加CaC_2脱P 的 I. INTRODUCTION In order to reduce the embrittlement susceptibility of rotor steel, chemical reaction vessel steel used at high temperatures, it is important to reduce the content of impurity elements such as P, As, Sn and Sb. Among these elements, P can be removed by an oxidative refining process. However, for the rest of the elements, except for the use of ultra-high vacuum, it has long been considered impossible to exclude them from the molten steel. As a result, there has been very little research on the removal of these impurity elements, and there appears to be only a selection of scrap methods for the production of high purity steel. However, in a series of high-Cr steels with CaC_2 de-P addition