Through the analysis of elements affecting the rough crystal zone in pipeline steel weld, it raises the flexing direction of rough crystal zone of pipeline steel.
通过对管线钢焊接粗晶区韧性影响因素的分析，提出了管线钢粗晶区的韧化方向。
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Burned coating: refers to the surface coating seriously dark, rough, such as carbon color generally. (means high current density zone).