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针对结构用缝钢管标准修订后 ,16Mn牌号与Q345牌号如何对应提出意见 ,认为结构用无缝钢管能够进一步细分种类
For structural seam steel pipe standard revised, 16Mn grade and Q345 grade how to correspond to the views that the structure of seamless steel pipe can be further subdivided into categories