非稳态浇铸连铸坯控制技术  

Control technology of slab in unsteady continuous casting process

作　　者：单庆林 贾刘兵 彭国仲 王皓 张丙龙 王胜东 

机构地区：[1]首钢京唐钢铁联合有限责任公司炼钢作业部,河北唐山063200

出　　处：《连铸》2017年第1期30-34,共5页Continuous Casting

摘　　要：针对连铸过程中产生的非稳态坯,通过夹杂物分析和氮氧分析,掌握各类非稳态因素对铸坯质量的定量影响。从夹杂物数量密度对夹杂物进行了分类,得到铸坯质量优先级顺序:正常坯>尾坯>换水口坯>头坯。对非稳态坯进行有针对性地工艺技术攻关,采用中包充氩技术、快涨拉速技术,头坯头部全氧质量分数由研发前的7.1×10^(-5)降低至当前的4.0×10^(-5);通过快降、快涨拉速协同控制技术、接痕控制技术,换水口坯大型夹杂物数量(大于50μm)由研发前的0.8个/cm^2降至0.4个/cm^2;采用"一键式"拉速控制技术、二冷水幅切控制技术和轻压下时间控制技术,尾坯的中心疏松得到了显著改善。By inclusion analysis and nitrogen-oxygen analysis on unsteady slab generated in continuous casting process,the effect of various types of unsteady factors on slab qualityhas been quantitatively ascertained. Inclusions were classified by inclusion quantity density, and the priority order of slab qualityis obtained： normal slabtail slabchange SEN slabhead slab. Targeted technology research on the unsteady slab has been conducted. Using argon filling technology for tundish and quickly increasing casting speed technology, thew（T[O]） in the head slab decreases from 7.1×10^-5to the current 4.0×10^-5. Through quickly decreaseand quickly increase casting speed cooperative control technology and seamcontrol technology, the quantity of large inclusions（50 μm） in change SEN slab has reduced from 0.8 to 0.4 per square centimeter. Using＂One-Button＂casting speed control technology, broad-narrow width switchcontrol technology in secondary cooling and soft reduction time control technology, the center porosity in tail slab has been significantly improved.

关 键 词：非稳态 夹杂物 氮氧分析 铸坯质量 

分 类 号：TF777[冶金工程—钢铁冶金]