高碳耐磨钢大方坯多机架轻重混合连续压下技术  

Soft-heavy combined continuous reduction with multi-units in bloom continuous casting for high carbon wear resistant steel

作　　者：王海达 兰鹏[2] 陈列 王海杰 范世强 艾宏洲 WANG Haida;LAN Peng;CHEN Lie;WANG Haijie;FAN Shiqiang;AI Hongzhou(Center of Technology and Quality,Jianlong Beiman Special Steel Co.,Ltd.,Qiqihar 161041,Heilongjiang,China;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]建龙北满特殊钢有限责任公司技术中心,黑龙江齐齐哈尔161041 [2]北京科技大学冶金与生态工程学院,北京100083

出　　处：《钢铁研究学报》2024年第1期55-65,共11页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(51874026)。

摘　　要：为解决高碳耐磨钢连铸坯中心缩孔和中心偏析缺陷问题,基于国内某厂250mm×280mm大方坯1.2m均等间距7机架拉矫装备的空间和结构特性,提出了通过多辊轻重混合连续压下改善高碳耐磨钢连铸坯中心质量的技术思路;采用有限差分法建立了大方坯凝固传热模型、冷却收缩模型和压下补偿模型,并基于现场数据进行了校正;制定了连铸坯凝固末端轻重混合压下的技术参数,拉速为0.63m/min时1~7号机架的设定压下量分别为2、3、5、5、5、3、0mm,实际总压下量为21.3mm。现场结果表明,本技术实现了250mm×280mm大方坯高碳耐磨钢总压下量20mm以上的安全稳定生产,连铸坯中心缩孔评级不超过0.5、中心偏析指数不超过1.04。In order to solve the problem of central porosity and central segregation in continuous casting of high carbon wear resistant steel,the technical idea of soft-heavy combined reduction by continuous multi-rollers to improve the central quality was proposed based on the space and structure characteristics of 7 closed packed withdrawal straightening units with equal spacing about 1.2m in a continuous caster of 250mm×280mm bloom from a domestic plant.The models of heat transfer and solidification,cooling and shrinkage,and reduction and compensation were developed by finite difference method and then verified by the measured data in the trial.The technical parameters for the soft-heavy combined reduction in the solidification end of the bloom were designed accordingly,the set amounts for No.1-No.7 withdrawal units during soft-heavy combined reduction at the speed of 0.63m/min are 2,3,5,5,5,3 and 0mm,respectively,and the total amount in actual trial is 21.3mm.The result from the industrial test indicates that the safety and stability can be ensured with a total reduction amount more than 20mm in the plant of 250mm×280mm bloom continuous casting for high carbon wear resistant steel.It is found that the central porosity index in the samples is not higher than 0.5,and the central segregation index is not higher than 1.04.

关 键 词：大方坯连铸 轻重混合连续压下 高碳耐磨钢 中心缩孔 中心偏析 

分 类 号：TF777[冶金工程—钢铁冶金]