前言使用常用的三氧化二铝——氟化钙二元渣系电渣重熔的PCrNi3MoV钢铸毛坯、经正常调质处理后,在纵向断口试样上,出现一种“电渣铸态断口”缺陷(见图1)。为了探索消除“电渣铸态断口的途径,继1973年五二研究所曾使用稀土氧化物做渣料,用以改善和消除“电渣铸态断口”缺陷的初步探索之后,于1976年又开展了稀土电渣的试验研究工作,并得到了改善和消除“电渣铸态断口”的明显效果(见图2和图3) Preface The PCrNi3MoV steel casting blank, which is commonly used by aluminum trioxide-calcium fluoride binary slag electroslag remelting, is subjected to normal tempering treatment. On the longitudinal fracture specimen, a “ ”Defects (see Figure 1). In order to explore ways to eliminate the “electroslag cast fracture”, following the 1973 Institute of the use of rare earth oxides as slag, to improve and eliminate the “ESR fracture” of the initial exploration, in 1976 and Carried out the experimental study of rare earth electroslag, and has been to improve and eliminate the “electroslag casting fracture” obvious effect (see Figure 2 and Figure 3)