X70 JCOE焊管机械扩径工艺  

Mechanical Expanding Diameter Process of X70 JCOE Pipe

作　　者：张志明 卢胜勇 苏景富 苏志 熊伟 

机构地区：[1]渤海装备巨龙钢管南京公司,南京210061

出　　处：《焊管》2011年第5期43-46,51,共5页Welded Pipe and Tube

摘　　要：根据国产TMCP微合金管线钢板屈服强度(Rt0.5)变化较大的现状,有针对性地对某厂X70管线钢板采用了JCO+机械扩径制造工艺,获得了对应屈服强度、抗拉强度、屈强比和冲击韧性的变化曲线,分析了不同扩径率下钢管的力学性能变化规律和微观组织对力学性能的作用机理,阐述了合理选择扩径工艺的实践作法,并给出了JCOE直缝埋弧焊管生产线X70管线钢板建议验收的下极限。According to the bigger change of yield strength（Rt0.5）for China domestic TMCP microalloy pipeline steel plate,a kind of relevant manufacturing process was adopted for X70 steel plate in some factory,and the change curve of corresponding yield strength,tensile strength,yield ratio and impact toughness were obtained.It analyzed mechanical properties change rule and effect mechanism of microstructure to mechanical properties,expatiated practices of reasonably selecting expanding process,and gave the ultimate limit for accepting X70 steel plate used for JCOE SAWL pipe production line.

关 键 词：TMCP X70 直缝埋弧焊管 扩径率 冲击韧性 

分 类 号：TG333.2[金属学及工艺—金属压力加工]