8American Petrolem Institute. API 1104 welding of pipelines and related facilities [ S ].20^th Edetion, Washington : API 2005.
9Jang-YongYoo,Seong-SooAhn,Dong-HanSeo,et al. New Development of High Grade X80 to X120 Pipeline Steels[J]. Materials and Manufacturing Processes, 2011,26 ( 1 ) : 154-160.
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