奥氏体不锈钢连铸坯轧制无缝管的缺陷遗传与控制  

Inheritance and control of the defect in hot rolled seamless tube by continuously cast billet for austenite stainless steel

作　　者：李圣海 兰鹏[2] 路祎帆 安钢 施亚清 张李睿 谭庆丰 贾红帅 LI Shenghai;LAN Peng;LU Yifan;AN Gang;SHI Yaqing;ZHANG Lirui;TAN Qingfeng;JIA Hongshuai(Department of Steelmaking,Zhejiang Qingshan Iron and Steel Co.,Ltd.,Lishui 323900,Zhejiang,China;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Technology Center,Fushun Special Steel Co.,Ltd.,Fushun 113001,Liaoning,China)

机构地区：[1]浙江青山钢铁有限公司炼钢部,浙江丽水323900 [2]北京科技大学冶金与生态工程学院,北京100083 [3]抚顺特殊钢股份有限公司技术中心,抚顺辽宁113001

出　　处：《连铸》2024年第2期71-76,82,共7页Continuous Casting

基　　金：国家自然科学基金资助项目(51874026)。

摘　　要：不锈钢连铸圆坯表面和内部缺陷会遗传到无缝管中,随之出现典型的裂纹、分层和折叠等问题,严重影响管材品质和使用性能。通过对热轧穿孔产品进行跟踪取样分析,揭示了连铸坯与管材之间缺陷的遗传关系,确定深振痕、白亮带和椭圆度与中心缩孔分别是导致不锈钢无缝管表面横裂纹、中间分层和内壁折叠的根本原因,对应提出了优化振动参数与保护渣、降低电磁搅拌功率、改善二冷均匀性与强度的控制策略,连铸工艺调整之后无缝管缺陷基本消除,实现了典型铸轧遗传性缺陷的源头控制。The seamless tube inherits the surface and internal defects in continuously cast round billet and shows the typical crack,delamination and fold problems,leading to the deterioration of tube quality and usage performance.According to the analysis on the tracking samples from hot puncturing product,the inheritance relationship in the defects between continuously cast billet and as rolled tube was revealed,and the basic reason for the formation of transvers surface crack,internal delamination and inner surface fold was identified as the deep mark,white band,ovality and central porosity,respectively.The corresponding countermeasures including optimizing oscillation and mold flux,lowering the power of electromagnetic stirring,and improving the evenness and intensity of secondary cooling were proposed.The defects in seamless tube was notably eliminated after the adjustment of process parameter in continuous casting,and the source control strategy on the typical hereditary defect in casting and rolling process wasachieved.

关 键 词：奥氏体不锈钢 无缝管 圆坯 连铸 缺陷遗传 

分 类 号：TG335.71[金属学及工艺—金属压力加工]