【国家标准】 金属材料　拉伸试验　矩形试样减薄率的测定

This standard specifies the terms and definitions,symbols and designations,principle,testing equipment,test piece,procedure,calculation of test results,report of the thickness reduction ratio of rectangular specimen of metallic materials by tensile testing.
This standard is applicable to the determination of thickness reduction ratio of metallic sheets by tensile testing of rectangular specimen.The determination of thickness reduction ratio of metallic pipes may also refer to this standard.