Φ800 mm圆坯Q355NE凝固传热数值模拟和工艺实践  

Numerical Simulation and Process Practice for Solidification and Heat Transfer ofΦ800 mm Round Billet Q355NE

作　　者：周伟基 姚玉东 刘佳伟 岳峰 张磊[2] Zhou Weiji;Yao Yudong;Liu Jiawei;Yue Feng;Zhang Lei(Chief Engineering Office,Dongbei Special Steel Group Co.,Ltd.,Dalian 116105;School of Materials Science and Engineering,Beijing University of Science and Technology,Beijing 100083)

机构地区：[1]东北特钢集团股份有限公司总工办,大连116105 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《特殊钢》2023年第2期7-11,共5页Special Steel

摘　　要：以钢厂断面尺寸为Φ800 mm圆坯Q355NE为研究对象,建立大圆坯传热模型,在不采用结晶器电磁搅拌的条件下,研究拉速和过热度对凝固过程的影响规律。结果表明:拉速对坯壳厚度、凝固终点位置和中心固相率的影响高于过热度,拉速每增加0.02 m·min^(-1),凝固终点后移2.6 m左右;过热度升高10℃,凝固终点后移0.21 m左右。实际生产中,二冷比水量0.18 L·kg^(-1)、过热度25℃、拉速0.14 m·min^(-1)时,出结晶器坯壳厚度超过43 mm,末端电磁搅拌充分发挥作用,铸坯中心疏松和中心缩孔较结晶器电磁搅拌(300 A/1.5 Hz)、二冷比水量0.18 L·kg^(-1)、过热度25℃、拉速0.16 m·min^(-1)工艺有所改善。Taking the section size of a steel plant as theΦ800 mm round billet Q355NE as the research object,the heat transfer model was established to study the influence of casting speed and superheat on the solidification process without electromagnetic stirring of the crystalliser.The results showed that the effect of casting speed on thickness of blank shell,the position of solidification end and centre solid phase rate washigher than that of superheat,and the solidification end pointmoved back about 2.6 m for each 0.02 m·min^(-1)increased in the casting speed;the solidification end pointmoved backabout 0.21 m for each 10℃increased in superheat.In actual production,the thickness of the crystallizer billet shell exceeded 43 mm,when the specific water flow of secondary cooling tensity was 0.18 L·kg^(-1),the superheat degree was 25℃,and the casting speed was 0.14 m·min^(-1),while the electromagnetic stirringat the ends can be allowed to play its full role,the processhas been improved.

关 键 词：Q355NE 大圆坯 数值模拟 拉速 过热度 

分 类 号：TF777[冶金工程—钢铁冶金]