355MPa级大规格耐候热轧H型钢的研制开发  

Research and development of 355MPa large gauge weather resistant hot rolled H-beam

作　　者：赵旭 吴保桥[1] 刘译泽 夏勐[1] 丁朝晖[1] 赵前程 ZHAO Xu;WU Baoqiao;LIU Yize;XIA Meng;DING Zhaohui;ZHAO Qiancheng(Technology Center of Maanshan Iron and Steel Co.,Ltd.,Maanshan 243000,China)

机构地区：[1]马鞍山钢铁股份有限公司技术中心,安徽马鞍山243000

出　　处：《轧钢》2025年第1期141-146,共6页Steel Rolling

基　　金：国家重点研发计划项目(G2021001)。

摘　　要：大规格耐候H型钢生产难度较大,需要同时兼顾产品表面质量和力学性能,为此,采用Cr-Ni-Cu系化学成分设计和3组试验方案,对比分析了不同化学成分和轧制工艺下试验钢的组织性能,获得了355MPa级大规格耐候热轧H型钢的最佳生产工艺。结果表明:没有添加Als的355MPa级耐候热轧H型钢坯料及产品表面的裂纹数量明显较少,其屈服强度约为410MPa,-30℃冲击功为115J,满足标准要求且富裕量均充足;化学成分相同、万能段第3道次轧制温度不高于970℃和950℃两种工艺下,试验钢微观组织分布均匀,且产品的性能和组织没有明显区别;综合分析3种试验方案,获得“无Als,万能段第3道次轧制温度不高于970℃”工艺为生产该355MPa级大规格耐候热轧H型钢的最优方案。The production of large gauge weather resistant H-beams is difficult,and it is necessary to simultaneously consider the surface quality and mechanical properties of the product.Therefore,a Cr-Ni-Cu system chemical composition design and three sets of test schemes were adopted to compare and analyze the microstructure and properties of the tested steel under different chemical compositions and rolling processes.The optimal production process for 355 MPa large gauge weather resistant hot rolled H-beams was obtained.The results showed that the number of cracks on the surface of 355MPa weather resistant hot rolled H-beam billets and products without the addition of Als was significantly less,and its yield strength was 410MPa.The impact energy at-30℃was 115J,which met the standard requirements and had sufficient surplus.Under two processes with the same chemical composition and the third pass temperature of the universal rolling not exceeding 970℃and 950℃,the microstructure distribution of the tested steels was uniform,and there was no significant difference in the properties and microstructure of the products.After comprehensive analysis of three test schemes,the process of"no Als,third pass temperature of universal rolling not higher than 970℃"was obtained as the optimal scheme for producing the 355MPa large gauge weather resistant hot rolled H-beam.

关 键 词：耐候钢 H型钢 化学成分设计 控轧温度 组织性能 

分 类 号：TG335.4[金属学及工艺—金属压力加工]