GCr15轴承钢精炼渣结晶矿相研究  

Study on crystal morphology of refining slag for GCr15 bearing steel

作　　者：刘志宏[1] 张兴中[1] 李国光 仇圣桃[1] 

机构地区：[1]钢铁研究总院连铸技术国家工程研究中心,北京100081 [2]承德建龙特殊钢有限公司,河北承德067300

出　　处：《炼钢》2015年第5期27-31,共5页Steelmaking

摘　　要：针对某钢厂GCr15轴承钢生产过程中精炼渣大量结块,导致钢液吸气,钢中夹杂物增多的问题,采用SEM和XRD分析方法,对不同渣系精炼渣的显微组织和结晶矿相进行分析,研究了不同组分对精炼渣结晶性能的影响。结果表明:GCr15轴承钢精炼渣为多矿相混合体,温降过程中大量析出的高熔点矿相包裹在钙铝酸盐或非晶相外,或分布于钙铝酸盐中,增大钙铝酸盐的结合强度,造成精炼渣结块。优化精炼渣组成处于相图中低熔点物相区,有效解决了精炼渣结块问题,使轧材中w(N)和w(O)合格率分别提高了7.07%,6.26%,非金属夹杂物合格率提高了14.70%,改善了GCr15钢洁净度。In order to solve the problem that lots of solidified crust of the refining slag during the production process of the GCr15 bearing steel, which resulted the sharply increase of gas and inclusion content in steel, the microstructure and crystal morphology of the refining slag was investigated by SEM and XRD, and the effect of the different composition on crystal morphology was studied. The results showed that the refining slag contained several crystalline phases, and numerous high-melting phases separated out with the decrease of temperature and wrapped up calcium aluminates or strengthened calcium aluminates, which made the refining slag crusted. The composition was optimized in low-melting phase zone, which prevented the solidified crusts effectively. And the qualified rate of w（N） and w（O） were increased by 7. 07 % and 6. 26 % in rolled bar,the qualified rate of non-metallic inclusions was increased by 14. 70%, the cleanliness of GCr15 steel was improved.

关 键 词：轴承钢 精炼渣 显微组织 结晶矿相 

分 类 号：TF769.2[冶金工程—钢铁冶金]