ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2022, Vol. 43 ›› Issue (5): 63-67.

所属专题: 连铸工艺

• 工艺技术 • 上一篇    下一篇

430不锈钢用连铸保护渣渣圈形成长大机理分析和控制措施

邸天成1,2,王杏娟1,2,刘增勋1,2,翟俊3,4,李欢3,4,朴占龙1,2   

  1. 1. 华北理工大学冶金与能源学院,唐山 063210;
    2. 河北省高品质钢连铸技术创新中心,唐山 063000;
    3. 太原钢铁(集团)有限公司先进不锈钢材料国家重点实验室,太原 030003 ;
    4. 山西太钢不锈钢股份有限公司技术中心,太原 030003 ;
  • 收稿日期:2022-06-07 出版日期:2022-10-01 发布日期:2022-09-29
  • 通讯作者: 王杏娟
  • 作者简介:邸天成(1997 -),男,硕士研究生
  • 基金资助:
    国家自然科学基金(51974133);
    河北省自然科学基金(E2019209543);

Analysis on Formation and Growth Mechanism of 430 Stainless Steel Mold Powder Slag-Bonding Rim and Control Measures

Di Tiancheng1,2 , Wang Xingjuan1,2 , Liu Zengxun1,2 ,  Zhai Jun3,4 ,  Li Huan3,4 , Piao Zhanlong1,2   

  1. 1. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 06321 ;
    2. Hebei High Quality Steel Continuous Casting Technology Innovation Center, Tangshan 063000 ;
    3. State Key Laboratory of Advanced Stainless Steel Materials, Taiyuan Iron and Steel( Group)Co. , Ltd.,Taiyuan 030003 ;
    4. Technology Center, Shanxi Taigang Stainless Steel Co. , Ltd. , Taiyuan 030003
  • Received:2022-06-07 Published:2022-10-01 Online:2022-09-29
  • Contact: Wang Xingjuan

摘要: 针对430不锈钢(0.03~0.04C,16~17Cr)生产过程中渣圈粗大的问题,利用电感耦合等离子体发射光谱仪、半球点熔点仪、粘度仪等设备对比分析了保护渣与渣圈的化学成分与理化性能,通过电子探针观测渣圈的微观结构,探究渣圈形成长大的机理。研究发现:除渣圈C含量0.53%和原渣C含量2.87%外渣圈成分与原渣无明显变化,但粘度与熔点均有所降低,渣圈约70%的区域由烧结相构成,其余30%为结晶相,主要由枪晶石与黄长石构成。烧结相的大量粘结是渣圈形成长大的主要原因。提高保护渣中预熔料比例至70%~80%及炭黑含量≥2%,并在生产中进一步稳定保护渣熔化过程,可有效抑制渣圈长大。

关键词: 430不锈钢, 保护渣, 渣圈, 微观结构, 形成机理, 措施

Abstract: In response to the problem of coarse slag-bonding rim in 430 stainless steel production process t the chemical composition and physicochemical properties of the mold powder and slag-bonding rim are compared and analyzed using ICP- OES, hemispherical point melting point meter, viscometer and other equipment, and the microstructure of the slag-bonding rim is observed through the electronic probe to explore the mechanism of slag rim formation and growth. It is found that except C content of slag-bonding rim being 0.53% and C content original mold powder being 2.87% , the composition of the slag-bonding rim and the original mold powder is not much different, but viscosity and melting point are reduced, about 70% of the area of the slag rim consists of the sintered phase, the remaining 30% is the crystalline phase, mainly composed of cuspidine and melilite. The sintered phase of a large number of bonding become a main reason for the formation and growth of the slag rim. Increasing the proportion of pre-melt material to 70%-80% and the content of carbon black in the mold flux ^2% , and further stabilizing the melting process of the mold powder in production, can effectively inhibit the growth of the slag rim.

Key words: 430 Stainless Steel, Mold Powder; Slag Rim, Microstructure, Mechanism of Formation, Measures