电热合金钢0Cr21A16NbRE电渣重熔用渣的研究

研究了电热合金钢OCr21A16NbRE电渣重熔用渣70%CaF₂-25%Al₂O₃-5%CaO在正常重熔制度下（A=2800 A,V=30 V）液态炉渣自然冷却与经过渣钢反应后冷却至固相渣的各部位成分与物相,分析了钢液中稀土元素的烧损。结果表明,液渣冷却的固相中不含稀土元素,其成分点位于CaF₂-CaO·2Al₂0₃-Ca0·6Al₂0₃组成的子三角形内,各层化学成分和物相不同,但以CaF₂为主。炉渣经渣钢反应后可分为五层,颜色、物相各不相同;CaF2含量最高部位在上两层,Al₂O₃含量从无到有逐层升高;各层均检测到稀土氧化物,中间层及最底层（钢液滴落处）含量较高,稀土相中以铈镧的铝酸盐（Ce,La）x（AlO₂）y为主相,该相结构致密硬度高。计算表明,在中下层区域,炉渣氧化性较强,钢中稀土元素主要在此部位被氧化。增加渣中Y₂0₃量有利于提高电渣锭中稀土元素Y的含量。

Study on Slag for Electroslag Refining of Electrothermal Alloy Steel 0Cr21A16NbRE

The ingredient and phases of solid phase slag without remelting liquid slag air cooling and with liquid-slag reaction remelting slag, air cooling of slag 70% CaF₂-25% Al₂O₃-5% CaO for ESR of electrothermal alloy steel 0Cr21A16NbRE with normal remelting process (A =2800 A,V =30 V) are studied,and the burning loss of RE elements in liquid is analyzed. The results show that without remelting air cooling slag has not RE elements it locates in CaF₂ -CaO • 2Al₂O₃-CaO • 6A1₂O₃ sub-triangle. The solid phase slag with liquid-slag reaction can be divided into five layers with different colors, difierent phase, the content of CaF₂ on the top is highest and decreases layer by layer, A1₂O₃ increase simultaneously ,RE oxide is found in layers and at the middle and bottom its content is higher, (Ce,La)x( A10₂ )  y is major RE oxide phase in slag, which density is high. It is obtained by calculation that slag oxidability is stronger in the middle and bot¬tom of slag,RE element in steel is oxided here. Increasing the Y₂O₃ amount in slag is favourable to increase the RE element Y content in ESR ingot.