In the light of abnormal fracture of DWTT test for high-grade pipe steel,the paper statistically analyzes the DWTT test results for X65,X70 and X80 pipe steel at a systemic temperature and studies their abnormal fracture rules.

• 针对高钢级管道钢在进行落锤撕裂试验(DWTT)时经常出现异常断口的现象,通过统计分析X65、X70和X80管材系列温度的DWTT试验结果,探讨了异常断口发生规律。