DIN EN ISO 643-2017 钢.表观粒度的显微照相测定法(ISO/DIS 643-2017);德文版本prEN ISO 643-2017

标准号：DIN EN ISO 643-2017
中文标准名称：钢.表观粒度的显微照相测定法(ISO/DIS 643-2017);德文版本prEN ISO 643-2017
英文标准名称：Steel - Micrographic determination of the apparent grain size (ISO/DIS 643:2017); German and English version prEN ISO 643:2017
标准类型：H11
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：H11
国际标准分类号：77.040.99
适用范围：This International Standard specifies a micrographic method of determining apparent ferritic or austenitic grain size in steels. It describes the methods of revealing grain boundaries and of estimating the mean grain size of specimens with unimodal size distribution. Although grains are three-dimensional in shape, the metallographic sectioning plane can cut through a grain at any point from a grain corner, to the maximum diameter of the grain, thus producing a range of apparent grain sizes on the two-dimensional plane, even in a sample with a perfectly consistent grain size.