作　　者： ; ; ; ; ; ;

机构地区： 东北大学材料与冶金学院轧制技术及连轧自动化国家重点实验室

出　　处： 《钢铁》 2004年第10期54-58,共5页

摘　　要： 为了使普通碳素结构钢 Q2 35的屈服强度提高到 5 0 0 MPa以上 ,对其化学成分进行调整 :提高 Mn元素的含量并加入微量微合金元素 Nb(小于 0 .0 2 % Nb) ,与控制轧制控制冷却工艺相结合。在本钢 170 0热轧机上进行了2次工业实验。结果表明 ,终轧温度为 85 0℃左右 ,卷取温度 5 5 0℃左右时 ,在细晶强化、相变强化和沉淀强化的综合作用下 ,实验钢屈服强度达到 5 0 0 MPa以上 ,冲击韧性良好 ,伸长率大于 2 5 %。 To improve the yield strength of Q235 steel from 200 MPa to over 500 MPa , the original chemical compositions of the steel were adjusted, and controlled rolling and cooling process was carried out.The content of Mn was increased and a little microalloy element Nb was added in.Industrial trials were carried out twice on the 1700 hot mill in Benxi Iron and Steel Corp..The mechanical properties of tested steels were measured.When the finishing rolling temperature is about 850 ℃ and the coiling temperature 550 ℃ or so, the yield strength of tested steels is enhanced to more than 500 MPa by means of refining grain size, phase transformation and precipitation strengthening.The ductility of the tested steels is good and the elongation is more than 25 %.

关 键 词： 微 处理 控轧控冷 屈服强度 复合强化

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]