金属加工（热加工）Issue(12)：22-27,6.
高耐候性低屈强比Q500qENH厚板桥梁钢开发研究
Development of heavy plate bridge steel with high weather resistance and low yield ratio for Q500qENH
摘要
Abstract
To develop Q500qENH bridge steel heavy plates meeting the requirements of high weather resistance and low yield ratio,this study conducted trial production using a production process combining"low-carbon and high-alloy composition+cooling process+tempering heat treatment",with the steel plate thickness being 60 mm.Through tensile,impact,and welding tests,by employing scanning electron microscopy and metallographic microscopy,the mechanical properties and microstructure of the steel plates after heat treatment were systematically analyzed.The results show that the microstructure of the tempered steel plates is mainly composed of bainite and acicular ferrite,and the fracture morphology presents ductile fracture.In addition,the transverse and longitudinal tensile properties and low-temperature impact properties of the steel plates are better than the standard requirements,with the ductile-brittle transition temperature ranging from-50℃ to-60℃,exhibiting low yield ratio,high weather resistance,and excellent low-temperature impact toughness.Meanwhile,the steel plates show excellent welding performance,and the mechanical properties of each region of the welded joints meet the technical standards.关键词
耐候桥梁钢/低屈强比/Q500qENH钢/焊接性Key words
weather resistant bridge steel/low yield to strength ratio/Q500qENH steel/weldability引用本文复制引用
胡战,刘鹏,赵淑晴,尹寒,毛凌波..高耐候性低屈强比Q500qENH厚板桥梁钢开发研究[J].金属加工（热加工）,2025,(12):22-27,6.基金项目
国防科技重点实验室基金项目(61420052024KJW04). （61420052024KJW04）
