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1.前言在进口钢管的检验和仿制中,国外技术标准对拉伸试样的形状、尺寸、标距及伸长率合格值的规定与我国的标准有些不同。如用日本STKM 13C钢种制造的φ98×4机械结构管,按JISG 3445-1983(日本工业标准)切取纵向条状试样(见图),测得伸长率
1. Introduction In the inspection and imitation of imported steel pipe, the requirements of foreign technical standards on the shape, size, gauge length and elongation of tensile test specimens are somewhat different from those of our country. Such as the use of Japan’s STKM 13C steel manufacturing φ98 × 4 mechanical structure of pipe, according to JISG 3445-1983 (Japanese Industrial Standards) cut longitudinal strip specimens (see Figure), measured elongation