配炭模式对超低碳连铸保护渣烧结特性的影响  

Effect of carbon blending mode on sintering characteristics of ultra-low carbon continuous casting mold flux

作　　者：朱立光 刘瑶 王杏娟 袁志鹏 朴占龙 ZHU Liguang;LIU Yao;WANG Xingjuan;YUAN Zhipeng;PIAO Zhanlong(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,Hebei,China;School of Materials Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050021,Hebei,China;Hebei High Quality Steel Continuous Casting Technology Innovation Center,Tangshan 063210,Hebei,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210 [2]河北科技大学材料科学与工程学院,河北石家庄050021 [3]河北省高品质钢连铸技术创新中心,河北唐山063210

出　　处：《中国冶金》2024年第9期113-121,共9页China Metallurgy

基　　金：国家自然科学基金资助项目(52374335,52304350,U21A20114);河北省高等学校科学技术研究项目(BJK2024057);唐山市市级科技计划项目(22130229H)。

摘　　要：低碳不锈钢生产过程中普遍存在增碳现象,严重影响生产稳定性。某厂生产430不锈钢过程中铸坯出现严重质量问题,采用进口粉末型超低碳保护渣有效解决了这一难题,但又出现渣圈发达问题。针对这一难题,以进口粉末型超低碳保护渣为基础渣系,结合全自动熔点熔速仪设备开展熔化速度试验,剖析进口粉末型超低碳保护渣配炭模式,利用厢式电阻炉设备研究其烧结特性,并优化配炭模式,得到与基础渣系具有相同理化特性且烧结率较低的保护渣。研究发现,当中超炭黑与粗粒度鳞片石墨质量分数比为1∶3时,保护渣平均熔化速度为58.6 s, 700~1 000℃下烧结率为53.47%~85.71%,与基础渣系的熔化速度相近;当中超炭黑与390石墨质量分数比为4∶1时,保护渣平均熔化速度为58.4 s, 700~1 000℃下烧结率降低了19.96~39.64个百分点;优化配炭模式后炭黑含量(质量分数)增加1.58个百分点,石墨粒径降低了102.5μm,同时比表面积也增加了186.547 m^(2)/kg,保护渣烧结过程中的固相反应温度提高了100℃,烧结率显著降低。研究结果为超低碳连铸保护渣的开发提供了基础数据和理论支持。Carbon increase is common in the production process of low-carbon stainless steel, which seriously affects the stability of production. In the process of producing 430 stainless steel in a factory, there were serious quality problems in the casting billet, and the use of imported powder-type ultra-low carbon mold flux effectively solved this problem, but there was a problem of developed slag ring. In order to solve this problem, the melting rate test was carried out by taking the imported powder-type ultra-low carbon mold flux as the basic flux system, combined with the automatic melting point melting rate meter equipment. The carbon blending mode of the imported powder-type ultra-low carbon mold flux was analyzed. The sintering characteristics were studied using the chamber resistance furnace equipment, and the carbon blending mode was optimized to obtain the mold flux with the same physical and chemical characteristics and lower sintering rate as the basic flux system. It is found that when the mass fraction ratio of medium and super carbon black to coarse-grained flake graphite is 1:3, the average melting rate of mold flux is 58.6 s, and the sintering rate at 700-1 000 ℃ is 53.47%-85.71%, which is similar to the melting rate of the basic flux system. When the mass fraction ratio of medium and super carbon black to 390 graphite is 4:1, the average melting rate of mold flux is 58.4 s, and the sintering rate at 700-1 000 ℃ is reduced by 19.96-39.64 percentage points. After optimizing the carbon blending mode, the carbon black content (mass fraction) is increased by 1.58 percentage points, the particle size of the graphite is decreased by 102.5 μm, and the specific surface area is also increased by 186.547 m^(2)/kg, the solid-phase reaction temperature during the flux sintering process is increased by 100 ℃, and the sintering rate is significantly reduced. The research results provide basic data and theoretical support for the development of ultra-low carbon continuous casting mold flux.

关 键 词：超低碳保护渣 烧结特性 炭质材料 熔化速度 烧结率 

分 类 号：TF777[冶金工程—钢铁冶金]