东北大学学报:自然科学版 ›› 2017, Vol. 38 ›› Issue (1): 62-66.DOI: 10.12068/j.issn.1005-3026.2017.01.013

• 材料与冶金 • 上一篇    下一篇

X80管线钢CaS形成机理研究

徐光, 姜周华, 李阳, 张聪   

  1. (东北大学 冶金学院, 辽宁 沈阳110819)
  • 收稿日期:2015-09-09 修回日期:2015-09-09 出版日期:2017-01-15 发布日期:2017-01-13
  • 通讯作者: 徐光
  • 作者简介:徐光(1989-), 男, 江苏连云港人, 东北大学博士研究生; 姜周华(1963-), 男, 浙江杭州人,东北大学教授, 博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(U1435205,51434004).

Study of CaS Formation Mechanism in X80 Pipeline Steel

XU Guang, JIANG Zhou-hua, LI Yang, ZHANG Cong   

  1. School of Metallurgy, Northeastern University, Shenyang 110819, China.
  • Received:2015-09-09 Revised:2015-09-09 Online:2017-01-15 Published:2017-01-13
  • Contact: JIANG Zhou-hua
  • About author:-
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摘要: 通过热力学计算,研究了Ca-Al,Al-S,Ca-S平衡关系.以Ca-Al,Al-S两个平衡为参考,在固定S含量的基础上,建立了液态钙铝酸盐区域分布图.结果表明:对X80管线钢wAl▲T=0.03%~0.06%,wCaT>0.001 7%~0.002 7%就可以生成液态钙铝酸盐,此时当钢液中wS>0.001 8%~0.002 8%即可有Ca与S直接反应生成CaS;Al2O3夹杂物变性程度对CaS的生成与否影响很大;随钢液中S含量的增加,钙铝酸盐夹杂物边缘生成CaS的可能性增加.通过工业实验,证明了热力学计算结果与实际生产符合得很好.找到了以不同方式形成的两种CaS,从而证明了预测CaS生成方式的合理性.

关键词: 热力学, 夹杂物, 硫化钙, 管线钢, 钙处理

Abstract: The equilibrium relationships of Ca-Al, Al-S and Ca-S were determined by thermodynamic calculation. The regional distribution of calcium aluminates was established on the basis of fixed sulfur content with the relationship of Ca-Al and Al-S as reference. The results indicate that liquid calcium aluminates can be generated with wCa▲T>0.001 7%~0.002 7% when wAl▲T in X80 pipeline steel is 0.03%~0.06%, and Ca and S can form CaS by direct reaction when wS>0.001 8%~0.002 8% correspondingly. The modification degree of Al2O3 inclusions has a great effect on the generation of CaS. With the increase of the S content in molten steel, the possibility of CaS formation at the edge of inclusion will increase. The agreement between thermodynamic calculation and actual production is proved by industrial test. Two kinds of CaS with different forming modes were found, and thus the rationality of predicted generating modes of CaS was proved.

Key words: thermodynamics, inclusion, calcium sulfide, pipeline steel, calcium treatment

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