强化电炉还原对冷作模具钢洁净度的影响工艺研究

Research on the Influence of Strengthening Electric Furnace Reduction on Cleanliness of Cold Working Die Steel

电炉强化还原新工艺,采用强脱氧剂铝锭和钢渣友,代替了原工艺中的弱脱氧剂硅铁块或粉,提高了炉渣碱度,加强了脱氧,大幅度降低了渣中Cr_2O_3含量。电炉出钢后,炉渣的流动性良好,钢包能够将高SiO_2含量的电炉还原渣去除干净,有效降低LF炉渣中的SiO_2含量,将精炼冷作模具钢的终渣成分控制在低SiO_2含量的钙铝渣系要求范围内,有效提高了渣系Al_2O_3溶解速率,从而减少钢中Al_2O_3夹杂物总量和降低B类氧化物夹杂级别,提高了冷作模具钢的洁净度。

The strong deoxidizer aluminum ingots and a special agent was adopted in the new electric furnace re- duction process instead of the weak deoxidizer fcrro-silicon blocks or powder in the previous process, thus increasing the alkalinity of furnace slag, strengthening deoxidization and greatly reducing Cr203 content in slag. After electric fur- nace tapping, the fluidity of slag is good. The ladle can remove high SiO： content electric.furnace slag and reduce SiO2 content in LF furnace slag. The compositions of the end slag for refined cold work die steel were controlled under the range required by low SiO2 content Calcium Aluminum slag system, and the dissolution rate of Al2O3 slag was improved effectively, so as to decrease the amount of Al2O3 inclusions, reduce the level of type B oxide inelusiom and improve the cleanliness of cold work die steel.