GB/T 13247-2019 代替 GB/T 13247—1991
铁合金产品粒度的取样和检测方法
Methods for sampling and testing the grain size of ferroalloys products (ISO 4551 ： 1987,Ferroalloys—Sampling and sieve analysis,MOD)
2019-10-17 发布
2020-05-01 实施
目 次
前言.....................................1
1范围......................................1
2规范性引用文件 ....................................1
3设备和工具.......................................1
3.1叉车或吊车....................................1
3.2拆包工具.....................................1
3.3取样铲......................................1
3.4取样钎......................................2
3.5 计堂磅秤....................................2
3.6直尺或卷尺....................................3
3.7试验筛......................................3
3.8振筛机......................................3
4试样的组成.......................................3
4.1直接组成大样...................................3
4.2由副样组成大样..................................3
5取样..........................................4
5.1取样铲......................................4
5.2取样钎......................................5
5.3手工挑选法....................................6
5.4整件包装.....................................6
6缩分..........................................6
7粒度检测........................................7
8检测結果及表示 ....................................7
8.1过大粒度的计算..................................7
8.2过小粒度的计算..................................8
8.3綜合粒度的汁算..................................8
8.4粒度检测结果的确定及表示.............................8
9筛分结果异议处理 ...................................8
10检验报告.......................................8
附录A （资料性附录）本标准与ISO 4551,1987章条编号的对照情况.......10
附录B （资料性附录）本标准与ISO 4551:1987的技术性差异及其原因......11
附录C （资料性附录）铁合金粒度测定的综合精确度....................12
附录D （资料性附录）铁合金的额定最大粒度与最小份样地的关系图