机架间冷却水对UF340表面组织均匀性的影响研究  

Effects of Cooling Water between Rolling Mills on Surface Microstructure Uniformity of UF340

作　　者：李奕 关建东 尉冬[2] 金磊[2] 王明哲 付光 Li Yi;Guan Jiandong;Wei Dong;Jin Lei;Wang Mingzhe;Fu Guang(Beijing Shougang Co.,Ltd.,Tangshan 064404;Research Institute of Technology of Shougang Group Co.,Ltd.,Beijing 100043)

机构地区：[1]首钢股份有限公司,唐山064404 [2]首钢技术研究院,北京100043

出　　处：《汽车工艺与材料》2024年第6期31-35,共5页Automobile Technology & Material

基　　金：中信铌钢发展奖励基金资助项目(M1922-2023,2023FWNB-30120)。

摘　　要：利用热轧试验及全流程跟踪研究了机架间冷却水开闭对UF340表面组织均匀性的影响。结果表明:机架间冷却水对热轧卷沿板宽方向的组织均匀性有一定影响,且部分会遗传至成品组织;机架间冷却水全开时,成品距边部1/4处表面晶粒存在少量未再结晶组织,而后部机架间冷却水冷却关闭后,由于热轧时再结晶较充分,成品组织沿板宽方向一致性较好,成品表面为细小的完全再结晶组织,有利于材料表面鲜映性的提升;UF340的细小均匀的组织特性使其涂漆变形后的波纹度仅为0.169μm,表面鲜映性(DOI)值达到92,满足主机厂免中涂表面质量要求。The effect of cooling water between rolling mills on the surface microstructure uniformity of UF340 was investigated using hot rolling experiments and full-process tracking.The results show that the cooling water between rolling mills has certain effect on the organization uniformity of the hot rolled coil along the transverse direction,and will be partially inherited to the final UF340 strip organization.When the cooling water between rolling mills is fully open,a small amount of non-recrystallized grain is retained on the surface of the final UF340 strip located at about 1/4 from the edge.When the latter part of water between rolling mills is closed,due to the full recrystallization during hot rolling,the final product has a better consistency of the organization along the transverse direction,presenting a fine and fully recrystallized tissue on the surface,which is beneficial to improving surface Distinctness of Image(DOI)of the material.The extraordinary uniformity of the microstructure makes the waviness of the UF340 after painting and deforming is as low as 0.169μm,and DOI value reaches 92,which fully meets the requirements of the surface quality for the intercoat-free coating process.

关 键 词：UF钢 机架间冷却水 微观组织 表面质量 

分 类 号：TG142.1[一般工业技术—材料科学与工程]