摘要
将大口径X80管线钢试样拉伸至应变为0.5%~3.5%,卸载后分别进行室温及200,230,250℃时效处理,研究了拉伸预应变和时效温度对试验钢拉伸性能的影响;采用直缝埋弧焊在制管扩径率为0.5%~0.8%下对试验钢进行制管,研究了制管扩径率对试验钢拉伸性能的影响。结果表明:进行一定应变预拉伸+时效处理或制管扩径后,试验钢发生应变时效,其屈服强度增大,抗拉强度变化较小,屈强比增大;制管扩径率对屈服强度增量和屈强比增量的影响比拉伸预应变的更大;室温应变时效后,拉伸预应变是影响屈服强度和屈强比提高的主要因素;200~250℃应变时效对试验钢拉伸性能的影响比室温应变时效的大,200~250℃时效温度的变化对拉伸性能影响不大。
Aging treatment at room temperature and 200,230,250℃,respectively,was conducted on X80 large-diameter pipeline steel specimens after stretching to strains of 0.5%-3.5% and then unloading;the effects of tensile pre-strain and aging temperature on tensile properties of the tested steel were studied.The tested steel was made into pipe by longitudinal submerged arc welding at pipe-making expanding ratios of 0.5%-0.8%;the effect of pipe-making expanding ratio on tensile properties of the tested steel was investigated.The results show that after tensile at a certain strain and then aging or pipe-making expanding,the strain aging occurred in the tested steel;the yield strength of the tested steel increased,the tensile strength changed little,and the yield ratio increased.The pipe-making expanding ratio had bigger influences on the yield strength increment and yield ratio increment than the tensile pre-strain had.Tensile pre-strain was the main factor that improved the yield strength and yield ratio after room-temperature strain aging.The effect of strain aging at 200-250℃ on tensile properties was stronger than that at room temperature.The variation of aging temperatures between 200-250 ℃ had little effect on the tensile properties.
作者
彭宁琦
史术华
罗登
熊祥江
李中平
PENG Ningqi;SHI Shuhua;LUO Deng;XIONG Xiangjiang;LI Zhongping(Technology and Quality Dept. of Hunan Valin Xiangtan Iron and Steel Co., Ltd., Xiangtan 411101, China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2018年第6期42-45,49,共5页
Materials For Mechanical Engineering
基金
湖南省科技重大专项项目(2012TT1009)
关键词
管线钢
应变时效
直缝埋弧焊管
扩径率
pipeline steel
strain aging
longitudinal submerged arc welded pipe
expanding ratio
