焊管Issue(4)：11-14,20,5.
X90直缝埋弧焊管加工硬化性能分析
Strain-hardening Performance Analysis of X90 SAWL Pipes
摘要
Abstract
The static tensile tests were conducted for X90 SAWL pipes produced by different China domestic manufacturers, and the strain-hardening performance of pipeline steel was analyzed. The results indicated that the tensile curve of X90 SAWL pipes has no significant yield platform, it belongs to the typical Round house curve. The double logarithmic curve of the true stress and strain cannot approximate to a straight line within the whole scope, in the plastic deformation area not completely comply with Hollomon formula, not with determined strain-hardening indexes. But the strain-hardening indexes of X90 pipes has three stages, the first and third stages are with determined strain-hardening indexes(marked as n1 and n2), and n1 is less than n2. Under the condition of ignoring the non-uniformity of samples and the experimental error, the uniform elongation (UEL) and strain-hardening indexes respectively shows a downward trend with the increase of yield ratio.关键词
焊管/X90钢/静拉伸/屈强比/均匀延伸率/加工硬化指数Key words
welded pipe/X90 steel/static tensile test/yield ratio/uniform elongation/strain-hardening index分类
矿业与冶金引用本文复制引用
陈晓莉,霍春勇,李鹤,李炎华,张继明,吉玲康..X90直缝埋弧焊管加工硬化性能分析[J].焊管,2015,(4):11-14,20,5.基金项目
陕西省自然科学基础研究计划资助项目（项目编号2011JQ6017）。 （）
