保护渣对430不锈钢铸坯表面质量的影响  

Effect of mold flux on surface quality of 430 stainless steel billet

作　　者：马骏鹏 李欢 MA Jun-peng;LI Huan(State Key Laboratory of Advanced Stainless Steel Materials,Taiyuan Iron and Steel(Group)Co.,Ltd.,Taiyuan 030003,Shanxi,China;No.2 Steelmaking Plant,Shanxi Taigang Stainless Steel Co.,Ltd.,Taiyuan 030003,Shanxi,China;Technology Center,Shanxi Taigang Stainless Steel Co.,Ltd.,Taiyuan 030003,Shanxi,China)

机构地区：[1]太原钢铁(集团)有限公司先进不锈钢材料国家重点实验室,山西太原030003 [2]山西太钢不锈钢股份有限公司炼钢二厂,山西太原030003 [3]山西太钢不锈钢股份有限公司技术中心,山西太原030003

出　　处：《连铸》2020年第4期29-33,共5页Continuous Casting

摘　　要：针对太钢(TISCO)430不锈钢连铸坯表面存在结疤、凹陷等质量问题,采用半球点熔点仪、黏度仪、扫描电镜等方法,系统研究了保护渣理化性能、连铸结晶器振动参数以及冷却强度对表面缺陷的影响。结果表明,保护渣黏度低、结晶性能弱是造成铸坯表面缺陷的主要原因。为此,通过优化保护渣的化学成分,将保护渣的黏度由0.20提高至0.33Pa·s,改善了渣膜的均匀性;碱度由1.00提高至1.16,提高了保护渣控制传热的能力。从而消除了铸坯结疤、凹陷等缺陷,实现了铸坯无修磨。同时,受保护渣中氟含量和黏度的影响,浸入式水口的寿命明显提升,连浇炉数由10炉提高到12炉。In order to solve the quality problems such as scab and depression on the surface of 430 stainless steel continuous casting slab produced by TISCO,hemispherical point melting point instrument,viscometer and SEM were used to study the influence of mold flux physical properties,continuous casting mold vibration parameters and cooling strength on surface defects.The results show that the main reasons for the surface defects are the low viscosity and weak crystallinity of the mold flux.Therefore,by optimizing the chemical composition of the mold flux,the viscosity of the protective slag is increased from 0.20 to 0.33 Pa·s,and the uniformity of slag film is improved;And the basicity is increased from 1.00 to 1.16,which improves the ability of the slag to control heat transfer.Therefore,the surface defects of the slab are eliminated,and the slab realizes no grinding.At the same time,due to the influence of fluorine content and viscosity in the slag,the life of immersion nozzle has been significantly improved,and the number of continuous casting furnaces has been increased from 10 to 12 furnaces.

关 键 词：430不锈钢 表面结疤 保护渣 浸入式水口 连铸坯 

分 类 号：TF777[冶金工程—钢铁冶金]