The delamination crack and its effect on the fracture of pipeline steel were investigated by drop-weight tear test(DWTT)at different temperature and micrograph analysis.

通过对管线钢不同温度的落锤撕裂试验和微观断口分析，研究了DWTT试样断口的分层裂纹及其对断裂的影响。

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The crack propagation rate of pipes was mainly dependent on FATT "of pipeline steel, and FATI" can be measured by drop weight tear test.

介绍了管道裂纹的扩展速度主要取决于管道钢的转变温度FATT, FATT可由落锤撕裂试验测定。

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The method and standard of drop weight tear test were described. It was also discussed how to evaluate the capability of pipeline steel to transit from toughness to fracture by DWTT.

论述了落锤撕裂试验的方法和标准，并对用DWTT来评定管材及其焊接接头的韧脆转化能力进行了探讨。

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