节镍型铜磷系耐候钢薄板带的质量控制工艺  

Quality control technology of nickel-saving copper-phosphorus series weathering steel sheet strip

作　　者：李宗强 张廷瑜 杨跃标 张盛华 LI Zongqiang;ZHANG Tingyu;YANG Yuebiao;ZHANG Shenghua(Technical Center,Guangxi Liuzhou Iron and Steel Group Company Limited,Liuzhou 545002,Guangxi,China;School of Resources,Environment and Materials,Guangxi University,Nanning 530004,Guangxi,China)

机构地区：[1]广西柳州钢铁集团有限公司技术中心,广西柳州545002 [2]广西大学资源环境与材料学院,广西南宁530004

出　　处：《金属功能材料》2023年第3期62-70,共9页Metallic Functional Materials

基　　金：广西柳州市科技计划项目(2021AAD0101)。

摘　　要：针对节镍型铜磷系耐候钢薄板带的质量问题,某钢厂采用镍铁替代镍板,将镍质量分数降低至0.011%~0.072%,采用转炉留渣少渣冶炼、高磷出钢与连铸“弱冷+低过热度+恒、高拉速+高矫直温度”浇铸系列工艺,控制二次冷却比水量在0.7~1.1 L/kg,控制中间包温度在1 529~1 543℃,将拉速稳定在1.45 m/min,解决了因冷却强度不合理引起的铸坯表面质量问题,铸坯表面裂纹率控制在0.3%以下;在此基础上,适当增加连铸的二冷水量,有效提高了坯壳强度,减轻鼓肚,减少P中心偏析现象;结合精密热轧控制技术,成功试制了节镍型铜磷系耐候钢薄板带。薄板带的尺寸精度高,表面质量良好,力学性能各项数据(R_(eL)>390 MPa、R_(m)>520 MPa、δ>26%)均超过了国标要求,生产成本大幅降低。In view of the quality problem of nickel-saving copper-phosphorus series weathering steel strip,a steel plant replaced nickel plate with ferronickel to reduce the nickel content to 0.011%~0.072%,and adopted converter slag and less slag smelting,combing with the casting process of"weak cooling+low superheat+constant,high drawing speed+high straightening temperature".The specific water volume of secondary cooling is controlled to be 0.7~1.1 L/kg,the ladle temperature is controlled to be 1529~1543℃,and the drawing speed is stabilized to be 1.45 m/min.The slab surface crack caused by unreasonable cooling intensity are solved,and the slab surface crack rate is controlled to be below 0.3%.On this basis,appropriately increasing the secondary cooling water volume of continuous casting effectively improved the strength of billet shell,reduce the bulge and P center segregation.Combined with precision hot rolling control technology,nickel-saving copper-phosphorus series weathering steel strip have been successfully developed.The dimensional accuracy of the steel strips is relatively high,the surface quality is relatively good,and the mechanical property indexes(R_(eL)390 MPa、R_(m)520 MPa、δ26%)far exceed the requirements of the national standard,and the production cost is greatly reduced.

关 键 词：节镍型铜磷系耐候钢 少渣 表面质量 P中心偏析 生产成本 

分 类 号：TF777[冶金工程—钢铁冶金]