电渣重熔渣系对C-HRA-3耐热合金夹杂物的影响  

The Effect of Electroslag Remelting Slag System on Inclusions in C-HRA-3 Heat-Resistant Alloy

作　　者：李龙飞 林腾昌[1] 张强 何西扣[2] 陈正宗[2] 周晓舟 Li Longfei;Lin Tengchang;Zhang Qiang;He Xikou;Chen Zhengzong;Zhou Xiaozhou(Department of Metallurgical Technology Research,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China;Institute for Special Steels,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China)

机构地区：[1]钢铁研究总院有限公司冶金工艺研究所,北京100081 [2]钢铁研究总院有限公司特殊钢研究院,北京100081

出　　处：《特殊钢》2023年第5期76-82,共7页Special Steel

基　　金：中央企业自主投入研发专项重大基金(20T61180ZD)。

摘　　要：本文利用10 kg级保护气氛电渣重熔炉,研究了两种电渣重熔渣系对C-HRA-3耐热合金电渣锭夹杂物数量、尺寸、分布规律的影响。结果表明,60%CaF_(2)-20%Al_(2)O_(3)-10%CaO-10%MgO渣系的液相线温度为1417℃,新型50.4%CaF_(2)-26.1%Al_(2)O_(3)-19.5%CaO-4%MgO渣系的液相线温度为1324℃,且固液两相区的温度区间较窄,液态熔渣的电阻率高,可实现C-HRA-3合金电渣重熔的高熔速稳定冶炼。两种渣系冶炼的电渣锭中,夹杂物主要包括氧化物、碳氮化物和硫化物等类型,电渣锭边缘位置夹杂物数量与自耗电极相近,电渣锭边缘到中心位置夹杂物数量呈现出逐渐减少的趋势。两种渣系冶炼的电渣锭中,氧化物夹杂的平均尺寸分别为3.019μm和2.341μm。新型渣系冶炼的电渣锭中,沿径向不同位置处,尺寸>3μm的氧化物夹杂数量占比均更小,对C-HRA-3合金大尺寸氧化物夹杂具有更显著的去除效果。In this paper,the effects of two types of electroslag remelting slag systems on the content of the quantity,size,and distribution of inclusions in C-HRA-3 heat-resistant alloy electroslag ingots was investigated by using a 10 kg level protective atmosphere electroslag remelting furnace.The results show that the liquidus temperature of 60%CaF_(2)-20%Al_(2)O_(3)-10%CaO-10%MgO based slag system is 1417℃,the liquidus temperature of new type 50.4%CaF_(2)-26.1%Al_(2)O_(3)-19.5%CaO-4%MgO based slag system is 1324℃and the new type slag system has a narrow temperature range between solidus and liquidus,and the resistivity of liquid slag is high,which can ensure the high melting rate and stable smelting of C-HRA-3 alloy electroslag remelting.The inclusions in the electroslag ingots produced by two slag systems mainly include oxides,carbonitrides,and sulfides.The number of inclusions at the edge of the electroslag ingots is similar to that of the consumable electrode,and the number of inclusions from the edge to the center of the electroslags shows a gradually decreasing trend.Moreover the average size of oxide inclusions in electroslag ingots smelted with two slag systems is respectively 3.019μm and 2.341μm.Along different radial positions of the new type slag system smelting electroslag ingot,the proportion of oxide inclusions with size>3μm is smaller,which has a more significant removal effect on large-sized oxide inclusions in C-HRA-3 alloy.

关 键 词：电渣重熔 渣系 C-HRA-3耐热合金 夹杂物 

分 类 号：TF743[冶金工程—钢铁冶金]