本文件规定了将在各种比例和非比例标距长度上获得的室温断裂后伸长率百分比转换为其他标距长度的方法。 当应用于抗拉强度范围300？N/mm2至700？N/mm2，在热轧、热轧和正火或退火条件下，有或没有回火。 这些转换不适用于: a)冷压钢； b)淬火和回火钢； c)奥氏体钢。 当标距长度超过？或者其中测试片的宽度与厚度比超过20。

This document specifies a method of converting room temperature percentage elongations after fracture obtained on various proportional and non-proportional gauge lengths to other gauge lengths. Formula (1), on which conversions are based, is considered to be reliable when applied to carbon, carbon manganese, molybdenum and chromium molybdenum steels within the tensile strength range 300？N/mm² to 700？N/mm² and in the hot-rolled, hot-rolled and normalized or annealed conditions, with or without tempering. These conversions are not applicable to: a) cold reduced steels; b) quenched and tempered steels; c) austenitic steels. These conversions are not applicable when the gauge length exceeds？or where the width to thickness ratio of the test piece exceeds 20.