To conduct drop weight tear test to DWTT specimen for each kind of notch type of grade X70 pipeline steel under different test temperature conditions and analyzes the related datum during test.

• 在不同试验温度条件下,对各种缺口形式的X70级管线钢DWTT试样进行了落锤撕裂试验,并对试验中的有关数据进行了分析。