转炉利用半钢试制易切削齿轮钢  

Trial production of free cutting gear steel by converter process under semi-steel steel-making condition

作　　者：陈天明[1] 姚永国[1] 陈亮[1] 李清春 曾建华[1] 寄海明 郭奠荣 

机构地区：[1]攀钢集团研究院有限公司,四川成都611731 [2]攀钢集团攀枝花钢钒有限公司,四川攀枝花617062

出　　处：《炼钢》2012年第1期1-4,10,共5页Steelmaking

摘　　要：针对含硫易切削齿轮钢20CrMnTiH(FQ)的成分特点和质量需求,结合攀钢提钒炼钢厂装备及工艺条件,通过提高入转炉半钢硫含量,选择合理的转炉终点控制、脱氧工艺及过程控铝模式、精炼工艺,采用分段式钙处理工艺分别对A类夹杂物进行变性,在RH处理后实施增硫,制订连铸关键工艺技术参数,打通了半钢炼钢条件下"转炉→LF→RH→200 mm×200 mm方坯连铸"生产该钢种的工艺流程。试验结果表明,试验钢成品成分控制范围较窄,硫成分控制稳定,钢水可浇性良好;连铸坯表面及低倍质量优良,w(T.O)=(11～18)×10-6;夹杂物控制达到预期目标;成材后各项性能均符合要求。In view of the composition characteristics and quality requirement of free cutting gear steel 20CrMnTiH（FQ）and in combination with the production conditions of equipment and process in Panzhihua Steel, technologies of free cutting gear steel producing have been studied. With these technologies such as sulfur content increasing in semi-steel, end-point control of converter, proper deoxidation process, reasonable aluminium control, secondary refining process, modification of inclusions type A with segmented calcium treatment, sulfur content increasing after RH refining process, as well as optimization of parameters in continuous casting process, 20CrMnTiH（FQ）can be produced steadily with semi-steel making conditions in the process of Convert Steelmaking→LF→RH→Continuous Casting. Results of industrial production indicate that the compositions of 20CrMnTiH（FQ）steel can be confined in a narrow range, and sulfur in steel controlled steadily as well. Moreover good surface and internal quality of continuous casting billet can be produced and w（T. O）is governed in the range of （11- 18）× 10^-6 with the average value of 14. 7×10^-6. Non-metal inclusion in steel and performance index of rolled bars can meet the requirements of consumers.

关 键 词：转炉 半钢炼钢 易切削齿轮钢 夹杂物变性 

分 类 号：TF762[冶金工程—钢铁冶金]