渣洗工艺对低碳钛微合金钢洁净度及性能的影响  

Effect of slag washing process on cleanliness and properties of low carbon titanium microalloy steel

作　　者：王博 李书恒 王杏娟 朱立光 黄伟丽 牛跃威 WANG Bo;LI Shuheng;WANG Xingjuan;ZHU Liguang;HUANG Weili;NIU Yuewei(School of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,China;School of Materials Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China;Technology Center of Delong Iron and Steel Industry Co.,Ltd.,Xingtai 054009,China;Hebei Hot Rolled Strip Technology Innovation Center,Xingtai 054009,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210 [2]河北科技大学材料科学与工程学院,河北石家庄050018 [3]德龙钢铁有限公司技术中心,河北邢台054009 [4]河北省热轧板带钢技术创新中心,河北邢台054009

出　　处：《炼钢》2023年第6期47-52,58,共7页Steelmaking

基　　金：国家自然科学基金青年基金资助项目(52004093);国家自然科学基金资助项目(51974133);国家自然科学基金区域创新发展联合基金重点资助项目(U21A20114);河北省钢铁联合基金项目资助(E2019209543)。

摘　　要：某厂生产的DL350低碳钛微合金冷轧结构钢,由于钢中夹杂物含量较高且冷轧断后伸长率较低,不能满足客户要求。为了降低生产成本,提升冷轧产品断后伸长率,制定了合理渣洗工艺,并分析了渣洗工艺对钢洁净度及性能的影响。结果表明,钢中夹杂物主要为MnS、TiN、MnS-TiN及少量的Al_(2)O_(3)夹杂物,采用渣洗工艺后钢液中的氧、氮含量均有明显下降。渣洗后铸坯显微夹杂物平均数量密度由21.3个/mm 2降低到15.7个/mm 2。同时,A类夹杂物级别由2.0~2.5降低到1.0~1.5,B类夹杂物级别由1.5~2.0级降低到0.5~1.0级,说明渣洗工艺对铸坯洁净度提升改善明显。通过对热轧和冷轧产品性能检测可以发现,渣洗工艺试样热轧断后伸长率由26%~28%提升到29%~31%,冷轧断后伸长率由15%~16%提升到18%~20%,强度整体变化不大,满足了客户的使用要求。Due to the high inclusion content and low elongation after cold rolling,the DL350 low carbon titanium microalloy cold-rolled structural steel produced by a certain plant cannot meet the customer′s requirements.In order to reduce the production cost and improve the elongation after fracture of cold rolled products,a reasonable slag washing process was developed,and the influence of slag washing process on the cleanliness and performance of steel was analyzed.The results show that the inclusions in steel are mainly MnS,TiN,MnS-TiN and a small amount of Al_(2)O_(3) inclusions,and the content of oxygen and nitrogen in molten steel decreased significantly with slag washing.After slag washing,the average content of micro-inclusions in the billet decreased from 21.3 to 15.7 per mm 2.At the same time,the grade of Class A inclusion was reduced from 2.0-2.5 to 1.0-1.5,and Class B inclusion was reduced from 1.5-2.0 to 0.5-1.0,indicating that the slag washing process significantly improved the cleanliness of the billet.Through the performance test of hot-rolled and cold-rolled products,it can be found that the elongation after hot-rolled fracture of slag-washing process samples has been increased from 26%-28%to 29%-31%,and the elongation after cold-rolled fracture has been increased from 15%-16%to 18%-20%,the overall strength changes little,which meets the customer′s requirements.

关 键 词：渣洗 显微夹杂物 洁净度 力学性能 微合金钢 

分 类 号：TF762.3[冶金工程—钢铁冶金]