中厚板坯连铸结晶器保护渣渣膜矿相结构研究  

Study on Mineralogical Constituents of Slag Film of Casting Powder for Continuous Casting of Plates

作　　者：刘丽娜[1,2] 韩秀丽[1] 刘磊[1] 李志民[3] 冯润明 轩宗宇[5] 

机构地区：[1]河北联合大学矿业工程学院,河北唐山063009 [2]燕山大学,河北秦皇岛066004 [3]河北联合大学轻工学院,河北唐山063000 [4]唐钢中厚板材有限公司,河北唐山063009 [5]唐钢第二钢轧厂,河北唐山063000

出　　处：《钢铁钒钛》2014年第1期85-89,共5页Iron Steel Vanadium Titanium

基　　金：国家自然科学基金资助项目(51174073);河北省自然科学基金资助项目(E2011209081)

摘　　要：利用光学显微镜及x-射线衍射等测试手段对中厚板坯Qg_35B钢种保护渣渣膜的矿物组成、结晶率、厚度、分层结构进行了系统分析研究。结果表明，中厚板坯Q235B钢种保护渣渣膜矿物组成为镁黄长石、枪晶石、硅灰石和玻璃相。出现纵裂的事故渣膜的结晶相主要为黄长石、枪晶石，结晶率为50％55％，呈玻璃层一结晶层一玻璃层三层结构；出现粘结漏钢现象的事故渣膜几乎全为结晶层，主要为枪晶石和硅灰石；正常渣膜结晶相以黄长石为主，结晶率为90％以上。为减少中碳钢铸坯表面纵裂及防止铸坯粘结漏钢的发生，建议提高保护渣渣膜中的结晶率，降低硅灰石的含量。The mineral compositions, crystallization rates, thicknesses, layered structures of slag film of casting powder for continuous casting of Q235B steel plates were analyzed by optical microscope and X- ray diffractometer . The result shows that the mineral compositions of slag film consist of akermanite, cuspidine, wollastonite and glass phase. When longitudinal cracks are found on strand surface during casting, the crystalline phases of the slag film are mainly melilite and cuspidine with a crystallization rate of 50% ~ 55%, and the film exists in a glassy layer-crystallizing layer-glassy layer structure. When sticking-type breakouts are found on strand, the slag film is dominated by crystallizing layer consisting of cuspidine and wollastonite. The crystalline phases of slag film under normal circumstances consists of melilite with crystallization rate of 90%. In order to avoid longitudinal cracks on medium carbon steel＇ s strand surface and sticking-type breakout of strand, it it suggested that the crystallization rate be improved and the content of wollastonite be reduced.

关 键 词：Q235B钢种 渣膜 显微结构 结晶率 矿物组成 

分 类 号：TF777.1[冶金工程—钢铁冶金]