›› 2016, Vol. 32 ›› Issue (1): 35-41.

• 炉外精炼 • 上一篇    下一篇

镀锡基板钢LF精炼过程洁净度研究

贾雅楠1,朱立光2,张彩军2,裴培3   

  1. 1. 北京科技大学冶金与生态工程学院
    2. 河北联合大学
    3. 首钢京唐钢铁有限公司
  • 收稿日期:2015-07-07 修回日期:2015-09-05 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: 朱立光 E-mail:zhulg@heuu.edu.cn
  • 基金资助:
    钢中微量元素在氧化物冶金中的作用机理及其对钢质量影响研究;高品质镀锡板技术开发;高品质镀锡基板夹杂物控制技术研究

Cleanliness study of tin plate steel during LF process

  1. 1.
    2. Hebei United University
  • Received:2015-07-07 Revised:2015-09-05 Accepted:1900-01-01 Online:2016-02-05 Published:2016-02-29

摘要: 为了解BOF→LF→CC工艺生产的MRT2.5镀锡板洁净度变化情况,系统取样分析了LF精炼过程中钢中总氧、氮含量变化,研究了LF精炼过程中夹杂物的类型、夹杂物数量及尺寸的变化,并分析了不同阶段夹杂物的转变机理。结果表明:LF精炼结束后,钢中w(T.O)=34.8×10^-6,w(N)=21.1×10^-6;LF精炼过程夹杂物的主要类型为:成渣后以MgO-Al2O3 为主,加铝后以Al2O3为主,钙处理结束后夹杂物以CaS-MgO-CaO-Al2O3为主;LF精炼过程中夹杂物数量总体呈下降趋势,LF精炼结束后,夹杂物数量达到3.9个/mm2,夹杂物粒径范围逐渐向0~5μm集中;某公司钢水条件下,若生成CaO-MgO-Al2O3系夹杂物w(Mg)应控制在(0.45~8)×10^-6,w(Ca)应控制在(2~20)×10^-6,a(O)应控制在(2~6)×10^-6,且为避免CaS夹杂的析出,w(S)应控制在0.004 2%以下。

关键词: 镀锡板, LF 精炼, 夹杂物, 洁净度

Abstract: In order to understand the cleanliness of MRT-2.5 tin plate steel by a BOF-LF-CC route, the system sampling was performed to analysis the content of nitrogen and total oxygen in liquid steel during LF refining, and variation of the types of inclusions, number and size of inclusions were studied during LF process. Transformation mechanism of inclusions was also studied at different stages. The experimental results show that, w(T.O)=34.8×10^-6 and w(N)=21.1×10^-6 at the end of LF refining. The main types of oxide inclusions are MgO-Al2O3 after slag forming, Al2O3 after aluminum addition, and CaS-CaO-Al2O3 at the end of calcium treatment. The number density of inclusions which decreases during LF refining is 3.9/mm2 at the end of LF refining and the diameter of inclusion particle size is gradually concentrated in the range of 0-5μm. Under the conditions in a company, w(Ca) content in liquid steel should be controlled in (2—20)×10^-6, and w(Mg) content in liquid steel should be controlled in (0.45—8)×10-6, and a(O) should be controlled in (2—6)×10^-6 in order to contr^ol inclusions in low melting point and w(S) content in liquid steel should be controlled in less than 0.0042% in order to avoid CaS inclusions with precipitation.

Key words: tinplate, LF refining, Inclusion, cleanliness

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