连铸轻压下对焊瓶钢成分及组织的影响  

EFFECT OF CONTINUOUS CASTING SOFT REDUCTION ON THE COMPOSITION AND STRUCTURE OF WELDED BOTTLE STEEL

作　　者：李岩杰 李立勋 刘志卫 张岩 Li Yanjie;Li Lixun;Liu Zhiwei;Zhang Yan(Technical Center of Tangshan Iron and Steel Co.,Ltd.,Tangshan 063100,Heibei)

机构地区：[1]唐山钢铁有限责任公司技术中心,河北唐山063100

出　　处：《河北冶金》2024年第9期63-68,共6页Hebei Metallurgy

摘　　要：以HP295焊瓶钢为研究对象,针对焊瓶钢连铸生产过程中出现的铸坯中心偏析、轧后产品局部区域组织异常等问题进行了生产跟踪试验,发现轧后产品的夹杂物及带状组织与铸坯中心偏析位置存在对应关系。阐明了铸坯中心偏析问题如何遗传影响轧后产品的组织及夹杂物分布。通过调整压下量、压下速率及压下位置节点等措施,设计了全新的焊瓶钢连铸轻压下工艺模型;并依据工艺对比试验,结合低倍分析、原位分析、金相分析等检测手段,发现应用新轻压下工艺方案后,连铸坯中心偏析、中心疏松、三角区裂纹均不超过0.5级,Mn、S元素的偏聚情况均得到了显著减轻,相应的卷板产品组织带状及夹杂物也得到了明显改善。最终确认了合理的连铸轻压下工艺能够有效改善HP295焊瓶钢铸坯中心成分偏析,减轻轧后产品的带状组织及夹杂物偏聚问题。同时优化后的轻压下工艺已通过数字化模型方案,推广应用于焊瓶类系列钢种,并实现了批量稳定生产。Taking HP295 welded bottle steel as the research object,the production tracking test was carried out to solve the problems of central segregation in the casting process of welded bottle steel and the abnormal regional organization of rolled products.It was found that there was a corresponding relationship between the inclusion and branded structure of rolled products and the central segregation position of the casting billet.The genetic influence of center segregation on the microstructure and inclusion distribution of rolled products was discussed.By adjusting the reduction amount,reduction rate and reduction position nodes,a new light reduction process model for continuous casting of welded bottle steel was designed.According to the process comparison test,combined with the detection methods of low power analysis,in-situ analysis and metallographic analysis,it was found that the central segregation,central porosity and triangle cracks of continuous casting billet were less than 0.5,the segregation of Mn and S elements were significantly reduced,and the corresponding branded structure and inclusions of coil products were also significantly improved.Finally,it is confirmed that the rational soft reduction process of continuous casting can effectively improve the segregation of central components of the casting billet of HP295 welded bottle steel,and reduce the problems of branded structure and inclusion segregation after rolling.At the same time,the optimized soft reduction process has been popularized and applied to welded bottle series steel through the digital model scheme,and the batch and stable production has been realized.

关 键 词：连铸 轻压下 焊瓶钢 成分偏析 带状组织 夹杂物 

分 类 号：TG142.1[一般工业技术—材料科学与工程]