本文件规定了通过筛分铁矿石和直接还原铁（不包括型铁）来确定粒度分布的方法，筛分使用的筛孔尺寸为36μm或更大。粒度分布以质量和质量百分比表示，通过或保留在选定的筛子上。本文件的目的是为铁矿石和直接还原铁的任何测试提供依据，包括尺寸测定，供缔约方在销售和购买这些材料时使用。 当本文件用于比较目的时，相关方将同意选择拟采用的详细方法，以消除后续争议的来源。

This document specifies the methods to be employed for determination of size distributions by sieving of iron ore and direct reduced iron (excluding briquetted iron), utilizing sieves having aperture sizes of 36 μm or larger. The size distribution is expressed in terms of mass and percentage mass, passed or retained on selected sieves. The purpose of this document is to provide a basis for any testing of iron ore and direct reduced iron involving size determination for use by contracting parties in the sale and purchase of these materials. When this document is used for comparative purposes, the concerned parties will agree on the selection of the detailed method to be employed in order to eliminate sources of subsequent controversy.