精轧工艺对30mm厚X65管线钢板组织和性能的影响  

Effect of Finishing Rolling Process on Structure and Performance of 30mm X65 Pipeline Steel Heavy Plate

作　　者：熊玉彰[1] 李银华[2] 王世森[1] 徐进桥[1] 余宏伟[2] 

机构地区：[1]武钢集团公司研究院,武汉430080 [2]武钢集团鄂钢公司技术中心,鄂州436000

出　　处：《特殊钢》2011年第6期53-55,共3页Special Steel

摘　　要：Nb-Ti微合金化X65管线钢(/%:0.07C、1.60Mn、0.35Mo)的生产工艺流程为130 t顶底复吹转炉-钢包吹氩-LF-RH-250 mm×1500 mm板坯连铸-连轧至30 mm板-控冷工艺。研究了第Ⅱ阶段开轧(890～940℃)轧后冷却温度(780～850℃)和冷却速度(8～20℃/s)对X65钢厚板拉伸、落锤性能和组织的影响。结果表明,Ⅱ阶段开轧温度为940℃,轧后冷却速度为20℃/s可以使X65钢厚板得到以针状铁素体和粒状贝氏体为主的组织,钢板抗拉强度665～695 MPa,屈服强度495～520 MPa,落锤纤维组织率约为92%,满足标准要求。The production flow sheet for Nb-Ti microalloying pipeline steel X65（/%：0.07C,1.60Mn,0.35Mo） is 130 t top and bottom combined blown converter-ladle argon blowing-LF-RH-250 mm×1500 mm slab casting-continuous rolling to 30mm plate-control cooling process.The effect of beginning rolling temperature（890～940℃） inⅡrolling passes, cooling temperature（780～850℃） and cooling speed（8～20℃/s） after rolling on tensile properties,drop-weight tear test（DWTT） performance and structure of X65 steel heavy plate has been studied.Results show that with beginning rolling temperature 940℃inⅡrolling passes and cooling speed 20℃/s after rolling the main structure in X65 steel heavy plate is acicular ferrite and granular bainite,the tensile strength and yield strength of plate are respectively 665～695 MPa and 495～520 MPa and the DWTT fibre structure ratio of plate is about 92%to meet the requirement of standard.

关 键 词：X65管线钢 30mm板 控轧控冷 组织 力学性能 

分 类 号：TG335.5[金属学及工艺—金属压力加工]