10B28冷镦钢线材表面结疤成因分析及控制措施  

Analysis on Causes of Surface Scabbing of 10B28 Cold Heading Steel Wire Rod and Control Measures

作　　者：李永超 温娜娜 樊亚鹏 冯兴磊 Li Yongchao;Wen Nana;Fan Yapeng;Feng Xinglei(Technical Center,Xingtai Iron and Steel Co Ltd,Xingtai 054027;Hebei Engineering Research Center for Wire Rod,Xingtai 054027)

机构地区：[1]邢台钢铁有限责任公司技术中心,邢台054027 [2]河北省线材工程技术研究中心,邢台054027

出　　处：《特殊钢》2020年第4期34-36,共3页Special Steel

摘　　要：采用金相显微镜和扫描电镜分析了10B28冷镦钢线材表面结疤,得出结疤缺陷形成的主要原因是钢中N含量偏高(0.013 3%),钢中的Ti(0.033%)不足以完全固N,过剩N与B形成BN析出物,弱化晶界,形成微裂纹,导致铸坯表面开裂,最终经轧制后遗传到线材表面。通过将废钢比由21%降低为10%、降低出钢脱氧强度、造完白渣喂入钛铁线5 min后加入硼铁、控制LF软吹底吹气量和浇注过程铝损≤0.003%等措施,将N稳定控制在60×10-6以下,保证Ti/N≥4,使表面结疤不良率由原来的60%降低至1.0%以下。The surface scabs of 1028 cold heading steel wire rod are analyzed by metallurgy and scanning electron microscope.It is concluded that the main reason is the high nitrogen content(0.013 3%) in the steel,the Ti in steel(0.033%) is not enough to completely fix nitrogen,and the excess N with B formes BN precipitates to weaken the grain boundary and form microcracks led to the surface cracking of the billet and finally inherited to wire rod surface after rolling.By reducing the scrap ratio from 21% to 10% and the deoxidization intensity of tapping,adding ferroboron after feeding TiFe wire for 5 min after white slag,controlling the soft blowing volume of LF,and aluminum loss ≤0.003% during casting process,N is stably controlled within 60 × 10-6 to ensure Ti/N≥4,the defective rate of surface scabbing is reduced from original 60% to less than 1.0%.

关 键 词：10B28钢 冷镦钢线材 表面结疤 成因分析 改进工艺 

分 类 号：TG142.1[一般工业技术—材料科学与工程]