东北大学学报:自然科学版 ›› 2020, Vol. 41 ›› Issue (2): 200-207.DOI: 10.12068/j.issn.1005-3026.2020.02.009

• 材料与冶金 • 上一篇    下一篇

坩埚材质对55SiCr弹簧钢中夹杂物的影响

李阳, 陈常勇, 秦国清, 姜周华   

  1. (东北大学 冶金学院, 辽宁 沈阳110819)
  • 收稿日期:2019-04-16 修回日期:2019-04-16 出版日期:2020-02-15 发布日期:2020-03-06
  • 通讯作者: 李阳
  • 作者简介:李阳 (1973-),男,辽宁鞍山人,东北大学副教授; 姜周华 (1963-),男,浙江萧山人,东北大学教授,博士生导师.冯明杰(1971-), 男, 河南禹州人, 东北大学副教授; 王恩刚(1962-), 男, 辽宁沈阳人, 东北大学教授,博士生导师.
  • 基金资助:
    国家重点研发计划项目(2016YFB0300105).

Effect of Crucible Material on Inclusions in 55SiCr Spring Steel

LI Yang, CHEN Chang-yong, QIN Guo-qing, JIANG Zhou-hua   

  1. School of Metallurgy, Northeastern University, Shenyang 110819, China.
  • Received:2019-04-16 Revised:2019-04-16 Online:2020-02-15 Published:2020-03-06
  • Contact: JIANG Zhou-hua
  • About author:-
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摘要: 实验采用MoSi2炉研究了MgO,MgO-CaO两种耐火材料对55SiCr弹簧钢中夹杂物的影响.结果表明,MgO,MgO-CaO两种坩埚冶炼均能使钢种成分控制在目标范围内,但与MgO坩埚相比,MgO-CaO坩埚净化钢液的效果更好:一方面,经MgO-CaO坩埚冶炼的55SiCr弹簧钢,钢中P,S,酸溶铝[Al]s 以及全氧T.O质量分数分别降低至56×10-6,10×10-6,≤5 ×10-6,以及4×10-6;另一方面,钢中夹杂物的平均直径由1.376μm降低至1.222μm,夹杂物尺寸<2μm的比例由79%上升至89%.这主要是因为碱性MgO-CaO坩埚兼具脱磷、脱硫、脱氧的作用,同时CaO还能与钢中的Al2O3夹杂物发生反应,生成熔点更低的复合夹杂物,因此更容易上浮去除,进一步净化钢液.

关键词: 弹簧钢, 55SiCr, 夹杂物, MgO坩埚, MgO-CaO坩埚

Abstract: The effects of MgO and MgO-CaO refractories on inclusions in 55SiCr spring steel were studied in a MoSi2 furnace. The results indicate that both MgO and MgO-CaO crucibles can adjust the composition of the steel within the aiming range. Moreover, compared with MgO crucible, MgO-CaO crucible is more effective in purifying the molten steel, in which the contents of P, S, [Al]s and T.O in 55SiCr spring steel smelted by MgO-CaO crucible are reduced to 56×10-6, 10×10-6, ≤5×10-6 and 4×10-6, respectively. The average diameter of inclusions in steel decreases from 1.376μm to 1.222μm, and the ratio of the inclusions with the size <2μm increased from 79% to 89%. This is mainly because the MgO-CaO crucible has not only the functions of dephosphorization, desulfurization and deoxidization, but also CaO reacts with Al2O3 inclusions in steel to form hybrid inclusions with lower melting point, which is easier to float and remove, so that the molten steel is further purified.

Key words: spring steel, 55SiCr, inclusions, MgO crucible, MgO-CaO crucible

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