炼钢

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硅含量对含钛不锈钢全氧和夹杂物的影响

成东全,陈兴润   

  1. (酒钢集团宏兴钢铁股份有限公司,甘肃 嘉峪关 735100)
  • 接受日期:1900-01-01 出版日期:2019-10-05

Effects of silicon content on the total oxygen and inclusions of Ti-bearing stainless steel

  • Accepted:1900-01-01 Online:2019-10-05

摘要: 采用热力学计算和工业试验相结合的方法对不同硅含量下含钛奥氏体不锈钢全氧含量和夹杂物进行了研究。结果表明,随着精炼过程进行,含钛奥氏体不锈钢钢液中全氧含量、夹杂物数量呈逐渐减小的趋势。在AOD冶炼末期,含钛奥氏体不锈钢夹杂物类型为CaO-SiO2-Al2O3-MgO,LF钛合金化前,夹杂物类型为CaO-Al2O3-MgO-SiO2。LF钛合金化后,夹杂物类型主要为CaO-Al2O3-MgO-TiOx球形夹杂物。热力学计算和试验结果具有较好的一致性。在其他条件一致的情况下,硅含量高的炉次跟硅含量低的炉次相比,钢液中氧含量低,夹杂物中钛含量低。

关键词: 含钛奥氏体不锈钢, 硅含量, 夹杂物, 全氧含量, 热力学计算

Abstract: The total oxygen content and inclusions in Ti-bearing austenitic stainless steel with different silicon content wereinvestigated through the coupling of thermodynamics calculation and experimental results. The results showed that the total oxygen content,the inclusion number and size decreased throughout the process. The types of inclusions at the end of AOD stagewere mainly CaO-SiO2-Al2O3-MgO,and the types of inclusions before Ti addition in LF refining processwere mainly CaO-Al2O3-MgO-SiO2.The inclusions after Ti addition in LF refining processwere mainly CaO-Al2O3-MgO-TiOx.The results calculated by FactSage software were in good agreement with those obtained by experiment.The heats with higher silicon content had lower total oxygen contentand lower titanium content in CaO-Al2O3-MgO-TiOx inclusions compared with the heats with lower silicon content when the other conditions were almost same.

Key words: Ti-bearing austenitic stainless steel, silicon content, inclusion, total oxygen content, thermodynamics calculation