炼钢 ›› 2021, Vol. 37 ›› Issue (4): 58-64.

• 产品工艺与质量控制 • 上一篇    下一篇

443超纯铁素体不锈钢冶炼过程氧含量和夹杂物分析

李振钢,陈兴润,张建龙,李树民,潘吉祥   

  1. (酒钢集团 宏兴钢铁股份有限公司,甘肃 嘉峪关 735100)
  • 出版日期:2021-08-05 发布日期:2021-07-26

Analysis of the oxygen content and inclusions in 443 ultra-pure ferritic stainless steel

  • Online:2021-08-05 Published:2021-07-26

摘要:

443超纯铁素体不锈钢冶炼过程的AOD结束、VOD结束、LF钙处理后、LF钛、铌合金后及连铸浇铸中期分别取钢样,分析了全氧含量和夹杂物的类型及形貌特征。采用共存理论对冶炼过程的平衡氧含量进行了计算。试验结果表明:全氧含量和平衡氧含量的变化规律是一致的,随着冶炼过程进行,全氧含量和全氧平衡氧含量整体是不断降低的。夹杂物类型:AOD主要为CaO-SiO2-Al2O3-MgOAl2O3VOD主要为Al2O3CaO-Al2O3-MgO-SiO2LF钙处理后,主要为CaO-Al2O3-MgO-SiO2;连铸中间包中夹杂物类型和LF钛、铌合金化后的夹杂物类型是一致的,都为球形的CaO-Al2O3-MgO-TiO2夹杂物。根据夹杂物类型提出了夹杂物的演变过程。

关键词:

443超纯铁素体不锈钢, 平衡氧含量, 全氧, 夹杂物, 成因, 离子分子共存理论

Abstract:

Samples taken from the end of AOD, the end of the VOD, LF after calcium treatment, LF alloying by Nb-Ti and tundish of the AOD-VOD-LF-tundish process during 443 ultra pure ferritic stainless steel were investigated to analyze the total oxygen and to characterize the inclusions type and morphology. The results show that the variation law for total oxygen is in good agreement with the equilibrium oxygen content. The total oxygen content and the equilibrium oxygen content decrease throughout the process. The types of inclusions change at different stages. The inclusion in AOD are mainly CaO-SiO2-Al2O3-MgO and Al2O3. The inclusion in VOD are mainly Al2O3 and CaO-Al2O3-MgO-SiO2.The inclusion type are mainly CaO-Al2O3-MgO-SiO2 after calcium treatment in LF. The inclusion in tundish are mainly CaO-Al2O3-MgO-TiO2,while in LF after alloying by Nb-Ti. Evolution process for the inclusions in the 443 stainless steel are proposed based on the inclusions type.

Key words:

443 ultra-pure , ferritc stainless steel, the equilibrium oxygen content, the total oxygen, inclusion, origin, ion-molecule coexistence theory