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一、概述发纹是钢的一种宏观缺陷,存在于钢材的中心以至外表,是与轴线方向平行的一种毛细条纹。我厂管坏或塔形
First, an overview Hairline is a macro defect of steel, which exists in the center of the steel and even appearance, is a parallel with the axial direction of a capillary strip. I plant bad or tower shape