›› 2016, Vol. 32 ›› Issue (1): 55-61.

• 凝固与浇铸 • 上一篇    下一篇

冷镦钢SWRCH22A头坯洁净度研究

张立峰1,方文2,任英1,任强1,束奇峰1,许英华3   

  1. 1. 北京科技大学
    2. 北京科技大学冶金与生态工程学院
    3.
  • 收稿日期:2015-06-16 修回日期:2015-07-29 接受日期:1900-01-01 出版日期:2016-02-05 发布日期:2016-02-29
  • 通讯作者: 张立峰 E-mail:zhanglifeng@ustb.edu.cn
  • 基金资助:
    中国自然科学基金

Cleanliness of the first billet of SWRCH22A steel

  1. 1. University of Science and Technology Beijing
    2.
  • Received:2015-06-16 Revised:2015-07-29 Accepted:1900-01-01 Online:2016-02-05 Published:2016-02-29

摘要: 对某厂冶炼冷镦钢从精炼到连铸过程钢的洁净度进行了研究,结果表明:开浇过程,由于严重的二次氧化,钢中w(T.O)和w(N)比正常浇铸过程要分别高出39×10^-6和21×10^-6,夹杂物的w(CaO)/w(Al2O3)不断降低;正常浇铸过程中,钢中w(T.O)和w(N)分别稳定在30×10^-6和65×10^-6左右,钢中夹杂物的w(CaO)/w(Al2O3)呈波动变化,且基本落入CaO-Al2O3-MgO-CaS低熔点区。热力学计算表明,在当前的钢液条件下,增氮质量分数3.5×10^-6将产生固态夹杂物。通过对连铸头坯T.O含量和氮含量、钢成分、夹杂物等方面综合分析,在现有条件下,切除头坯前3 m有利于铸坯质量和洁净度的控制。

关键词: 冷镦钢, 头坯, 洁净度, 夹杂物

Abstract: The variation of cold heading steel cleanliness from LF end to continuous casting was investigated. The results showed that,Due to severe reoxidation from LF end to casting starts, the mass fraction of T.O and \[N\] in steel increased by 39×10^-6 and 21×10^-6 respectively, and the w(CaO)/w(Al2O3) of inclusions decreased. At steady casting period, the T.O and \[N\] content decreased and stabilized at 30×10^-6 and 65×10^-6 respectively, while the ratio of w(CaO)/w(Al2O3) of inclusions fluctuated and located in the low melting point area of CaO-Al2O3-MgO-CaS diagram. Thermodynamic calculation indicated that with current steel composition, a 3.5×10^-6 nitrogen pickup would generate solid inclusions. The first three meters of the head billet was suggested to be cut off to assure a good steel cleanliness.

Key words: cold heading steel, head billet, cleanliness, inclusions

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