增氮析氮法去除钢中夹杂物工艺实践  

Industrial Experimental Study on Removal of Inclusions in Steel by Nitrogen Addition and Release Method

作　　者：张宇迪 刘建华 何杨 李巍 林俊宇 陈修君 毕胜 Zhang Yudi;Liu Jianhua;He Yang;Li Wei;Lin Junyu;Chen Xiujun;Bi Sheng(Institute of Engineering Technology University of Science and Technology Beijing,Beijing 100083,China;Dongbei Special Steel Group Trade Co.,Ltd.,Dalian 116105,China)

机构地区：[1]北京科技大学工程技术研究院,北京100083 [2]东北特殊钢集团股份有限公司,大连116105

出　　处：《特殊钢》2023年第6期53-57,共5页Special Steel

基　　金：国家自然科学基金项目(No.52174292)。

摘　　要：在42CrMoA合金结构钢LF-RH精炼生产中,进行了原生产工艺和增氮析氮法去除钢中夹杂物技术工业试验研究,获得了良好的实验效果。通过系统取样,发现在增氮析氮法LF精炼过程中,通过底吹增氮法可使钢中T[N]含量增至260×10^(-6)以上,满足RH真空精炼过程中以气泡形式析氮的需求;增氮析氮法还具有良好的全氧去除效果,经RH真空处理后,平均T[O]含量下降率可达37.4%;增氮析氮法也具有良好的夹杂物去除效果,经处理后单位面积夹杂物数量由原有的8.771个/mm^(2)降为3.585个/mm^(2),去除率达34.6%;在各类夹杂物中,增氮析氮法对氧化铝夹杂去除效率最高,处理后可将钢中Al2O3夹杂比例由83%降为74%,有效提升了42CrMoA合金结构钢洁净度。In the refining production of LF-RH of 42CrMoA alloy structural steel,the original production process and the industrial test technology of steel inclusion removal by nitrogen addition and release method were carried out,and the good experimental results were obtained.Through systematic sampling,it was found that adding nitrogen through bottom blowing during the LF refining process can increase T[N]in the steel to 260×10^(-6),and meet the demand of nitrogen release in the form of bubbles during RH vacuum refining process;Nitrogen addition and release method also had good total oxygen removal effects,after RH vacuum treatment,the average T[O]content reduction can reach 37.4%;Nitrogen addition and release method also had good inclusion removal effect,the number of inclusion per unit area can be reduced from the original 8.771 pieces/mm^(2)to 3.585 pieces/mm^(2)after treatment,and the removal rate can reach 34.6%;In all kinds of inclusions,nitrogen extraction method had the highest removal efficiency of alumina inclusion,the proportion of Al2O3 inclusion in steel can be reduced from 83%to 74%after treatment,which effectively improved the cleanliness of 42CrMoA alloy structural steel.

关 键 词：增氮析氮法 增氮 夹杂物 总氧 RH精炼 42CRMOA钢 

分 类 号：TF769[冶金工程—钢铁冶金]