酸性渣SiO2含量对电渣重熔S-Pb-Te易切削不锈钢冶金质量的影响

通过500 kg保护气氛电渣炉试验研究三元渣（/%:65CaF2,25Al2O3,5SiO2）、四元渣（/%:55CaF₂,20Al₂O₃,20SiO₂,5CaO）和五元渣（/%:45CaF₂,20Al₂O₃,25SiO₂,5CaO,5MgO）对S-Pb-Te易切削不锈钢（/%:1921 Cr,1.52.5Mo,0.10.3Pb,0.250.40S,0.030.10Te）电渣锭冶金质量的影响。结果表明,四元渣和五元渣S收得率较三元渣高;三元渣Pb收得率相对较高;3种渣系Te收得率无明显差异;含SiO₂为25.0%的五元渣系,所重熔的S-Pb-Te易切削不锈钢电渣钢锭小头和大头S、Pb和Te偏差最小,分别为△S 0.03%、△Pb 0.02%和△Te0.028%,且电渣钢锭表面质量良好。

Effect of SiO2 Content in Acid Slag on Metallurgical Quality of Electro-Slag Remelting S-Pb-Te Free Cutting Stainless Steel

The effect of ternary slag (/% : 65CaF₂ , 25Al₂O₃, 5SiO₂ ) , quaternary slag (/% : 55CaF₂ , 20Al₂0₃, 20SiO₂, 5CaO) and quinary slag (/% : 45CaF₂,20Al₂O₃,25SiO₂,5CaO, 5MgO) on metallurgical quality of electro-slag ingot of S-Pb-Te free cutting stainless steel (/% : 19 -21Cr, 1.5 -2. 5Mo, 0. 1 -0. 3Pb,0. 25 -0. 40S,0. 03 -0. 10Te) has been tested and studied by 500 kg shielding atmosphere electro-slag remelting ( ESR) furnace. Results show that the yield of S in steel remelting by quaternary slag and quinary slag is higher than that by ternary slag ； the yield of Pb remelting by ternary slag is relative higher； the yield of Te remelting by three kind of slag series is no-obvious difference； with SiO₂ content in steel remelting by quinary slag is 25. 0% the deviation of S, Pb and Te content in S-Pb-Te free cutting stainless steel ESR ingot from top to bottom is minimum, that are respectively AS 0. 03% , APb 0. 02% and ATe 0. 028% , and the surface quality of electro-slag ingot is best.