酸性电弧炉熔炼硅锰钢工艺研究

A Study on Acid Arc Furnace Melting Process of Si-Mn Steel

控制冶炼周期中的净沸腾操作可控制钢中氧含量的高低,即净沸腾时间控制为8～12min,钢液原始含氧量可控制在100ppm以内,可得到球形、方形的Ⅰ、Ⅲ型硫化物,冲击韧度可达到40J/cm2。用硅铝钡铁合金沉淀脱氧比用碳化硅粉和碳粉进行扩散脱氧,无论是在脱氧速度和脱氧效果上都好得多,钢液氧含量下降速度快,钢液中氧原始含量(质量分数)低,稀土残余量(质量分数)达到0.04722%,冲击韧度平均达到37J·cm-2。

By keeping softly seething time in the range of 8-12 min, the original oxygen content of molten steel could be kept below 100 ppm that made it possible to obtain Ⅰ or Ⅲ type spheroidal or quadrate sulphides. As a result, The impact toughness could reach 40 J/cm^2. Compared with using SiC powder and carbon powder to conduct diffusion deoxidization, the deoxidization velocity and the deoxidization effect of using Si-A1-Ba-Fe alloy to conduct precipitation deoxidization is much better, and oxygen content of molten steel decreased fast, original oxygen content of molten steel is low, so that the residual RE content reached 0.04722%, and average impact toughness reached 37 J·cm^-2.