炼钢 ›› 2020, Vol. 36 ›› Issue (4): 70-74.

• 产品工艺与质量控制 • 上一篇    下一篇

精炼渣碱度对弹簧钢夹杂物的影响研究

李小虎,龚志翔,高振波   

  1. (马鞍山钢铁股份有限公司 特钢公司,安徽 马鞍山 243000)
  • 出版日期:2020-08-05 发布日期:2020-08-04

Study on the effect of refining slag basicity on inclusions in spring steel

  • Online:2020-08-05 Published:2020-08-04

摘要: 为了评价不同精炼渣对弹簧钢中夹杂物数量、组成、尺寸及形态的影响,在EAF→LF→RH→CC工艺流程下,设计了两种不同渣系,通过全氧分析、渣样分析、夹杂物分析等手段评价了两种精炼渣全氧及夹杂物控制水平。研究表明,相对于低碱度渣(1.0),高碱度渣(1.7)有利用钢水脱氧、脱硫,钢水全氧含量更低;不同碱度情况下,钢中夹杂物类型基本相同,主要由MnS、CaO-SiO2Al2O3、Al2O3-MgO、CaS-MnS、TiS-MnS等夹杂物所组成,低碱度精炼渣钢中MnS与CaO-SiO2-Al2O3夹杂物数量显著多于高碱度精炼渣;高碱度渣的钢中A类、B类和D类夹杂物控制更好;从夹杂物控制水平考虑,采用碱度1.7的精炼渣更为合适。


关键词: 弹簧钢, 精炼渣, 碱度, 夹杂物

Abstract: In order to evaluate the influence of refining slag on inclusions in quantity,composition,size and morphology of spring steel,two different slag systems were designed to study the effect of slag basicity on total oxygen and inclusions by total oxygen analysis,slag sample analysis and inclusion analysis under EAF→LF→RH→CC process.The research shows that compared with low basicity slag (1.0),high basicity slag (1.7) has the advantage of deoxidization and desulfurization of molten steel,and the total oxygen is lower.The inclusions in steel are basically the same under different basicity conditions,which is mainly consist of MnS,CaO-SiO2-Al2O3,Al2O3-MgO,CaS-MnS,TiS-MnS and other inclusions.The amount of MnS and CaO-SiO2-Al2O3 inclusions in low basicity refining slag steel is significantly more than that in high basicity refining slag.The type A,B and D inclusions with high basicity slag are better controlled.Considering the inclusion control level,refining slag with basicity of 1.7 is more suitable.


Key words: spring steel, refining slag, basicity, inclusion