分析了深水海底管道计的技术特点,并就深水海底管道的较大壁厚、直缝埋弧焊钢管的变形率以及微观组织的均匀性,对落锤撕裂试验(drop weight teat test,简称 DWTT)止裂性能的影响进行了分析,认为采取减小有效晶粒尺寸和降低夹杂物含量等措施,均有利于提高深水海底管道DWTT 的断裂韧度。%The paper analyses the technical characteristics of design to submarine pipeline in deep water,and analyses the effect on DWTT performance of larger wall thickness,deformation rate of SAWL pipe,microstructure uniformity.It is considered to take effective grain size decreases,reducing the inclusion content and other measures are conducive to im-proved fracture toughness DWTT deepwater sub sea pipelines.
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