低合金钢保护渣渣膜矿相结构对铸坯质量的影响  

Effect of mineralogical structure of flux film on the slab quality for low-alloy steel

作　　者：韩秀丽[1,2] 刘磊[1] 刘丽娜[1] 朱立光[3] 冯润明 刘志远 

机构地区：[1]河北联合大学矿业工程学院,河北唐山063009 [2]河北省矿业开发与安全技术实验室,河北唐山063009 [3]河北联合大学冶金与能源学院,河北唐山063009 [4]唐钢中厚板材有限公司,河北唐山063009

出　　处：《炼钢》2013年第3期45-48,57,共5页Steelmaking

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);河北省科技厅资助项目(11215601D)

摘　　要：针对唐钢中厚板材有限公司低合金钢Q345B连铸过程中出现的铸坯质量问题,系统研究了现场结晶器内渣膜的结构、矿相组成和结晶率;并结合现场铸坯质量,分析渣膜的润滑与传热性能,确定了适用于低合金钢Q345B板坯连铸生产较合理的矿相结构特征。结果表明,低合金钢Q345B的渣膜应为两层结构或多层结构,结晶层和玻璃层交替出现;主要结晶矿物为枪晶石和黄长石,在结晶过程中没有偏向性析出;有较多的玻璃相生成,结晶率相对较低,在35%～65%。为更好地保证铸坯质量,针对唐钢中厚板坯Q345B的连铸生产,建议在现用的保护渣原渣中适当提高Fe2O3和MgO的含量,同时还要调整好现场的浇铸工艺和操作条件。In light of the slab quality problems in in Tangshan Medium Thickness Plate Company, the production of low-alloy steel Q345B the mould flux film structure, minera- logical phase and crystal rate have been roundly studied. While combining the quality of slabs, the reasonable mineralogical structure for Q345B steel slab casting is defined by analyzing performance of lubricity and heat conductivity. The results show that, the reasonable solidified film has two layers or more, in which mineralogical phase and glass phase are alternately generated） the mineralogical phase includes cuspidine and akerman- ite, of which the crystallizing process has a good tendency） with much glass phase, crystal rate of film ranges 35 %-65 %. In order to keep the slab quality well, casting mould powder for low-alloy steel Q345B should be added more bits of MgO and Fe203, meanwhile pouring crafts and operational conditions should be continually adjusted.

关 键 词：低合金钢 连铸保护渣 渣膜 矿相结构 铸坯质量 

分 类 号：TF777[冶金工程—钢铁冶金]