Q420B等边角钢腿部微裂纹成因及解决措施  

Causes and Solutions of Leg Micro-crack for Q420B Angle Steel

作　　者：张军 蔺筠 赵长忠 ZHANG Jun;LIN Yun;ZHAO Changzhong(Shiheng Special Steel Group Co.,Ltd.,Feicheng 271612,China)

机构地区：[1]石横特钢集团有限公司,山东肥城271612

出　　处：《山东冶金》2021年第6期15-16,共2页Shandong Metallurgy

摘　　要：角钢表面微裂纹问题,分析导致问题产生的诸多原因,根据影响因素分别排查了物料潮湿度、钢坯化学成分、气体含量、添加合金成分、结晶器及其系统运行状况、保护渣成分等。经过工艺对比试验、结晶器保护渣试用、电镜分析,发现保护渣成分是导致微裂纹产生的主要原因。通过调整保护渣成分,稳定保护渣质量,问题得以解决。It is a quite important problem for the micro-crack on the surface of angle steel and paid more attention to now.This essay analyses the main factors leading to this issue.In addition,based on these factors,this essay examines and analyses the humidity of raw material,chemical composition of billet,volume of gas etc.The compositions of mold flux are the main reason leading to micro crack through technical process contrast experiment,caster mold flux and electron microscope analysis.Depending on this analysis,the micro-crack has been successfully resolved by adjusting the composition of mold flux and stabilizing the quality of mold flux.

关 键 词：Q420B等边角钢 表面裂纹 钒氮合金 氮化钒铁 保护渣 

分 类 号：TF777[冶金工程—钢铁冶金]