低Mo耐火建筑用钢Q345FRE开发试验研究  

Development and Experimental Research of Low Mo Steel for Fire-resistant Building

作　　者：李可斌[1] 孟庆勇[1] 刘爱平 张靖雨 王强[1] Li Kebin;Meng Qingyong;Liu Aiping;Zhang Jingyu;Wang Qiang(Tangshan Iron and Steel Group Co.,Ltd.)

机构地区：[1]唐山钢铁集团有限责任公司

出　　处：《宽厚板》2023年第5期14-18,共5页Wide and Heavy Plate

摘　　要：综合考虑合金元素对耐火建筑用钢高温力学性能的作用,在实验室采用500 kg多功能真空感应炉完成低Mo成分体系Q345FRE耐火钢热轧基料的制备,使用550 mm热轧实验机组完成15 mm厚度耐火建筑用钢板的轧制和冷却。比较轧后水冷和空冷两种工艺,常温力学性能均满足GB/T 28415—2012《耐火结构用钢板及钢带》标准要求。轧后空冷钢板的高温性能未满足国标要求,而轧后水冷钢板的高温性能满足国标要求,主要原因为水冷钢板高温组织相比空冷显著细化。通过合适的成分设计、轧制和冷却工艺,实现了15 mm厚度耐火建筑用钢Q345FRE的成功试验开发。Having comprehensive consideration on the functioning of alloy elements to the high temperature mechanical properties of fire-resistant building steel,the hot rolling raw material for Low Mo content composition system Q345FRE fire-resistant steel is prepaired by 500 kg multi-function vacuum induction furnace in the lab.The 15 mm thick fire-resistant building steel plate is rolled and cooled by 550 mm lab hot rolling mill train.Comparing the two processes of water cooling and air cooling after rolling,the ambient temperature mechanical properties satisfy the international standard requirements of GB/T 248415—2012 Steel Plate and Strip for Fire-resistant Structure.The high temperature properties of as-rolled steel plate after water cooling don't meet the GB standard requirements,but the high temperature properties of as-rolled steel plate after air cooling satisfy the GB standard requirements,the main reason is that the high temperature microstructure of water cooled steel plate is much finer that that of air cooled steel plate.By means of rational composition design,rolling and cooling process,the experimental development of 15 mm thick fire-resistant building steel Q345FRE is realized.

关 键 词：耐火建筑用钢 冷却工艺 高温力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TU511.3[金属学及工艺—金属材料]