ISO 5074:2015规定了使用Hardgrove机器测定硬煤可磨性指数的方法。它还规定了校准试验机和制备标准参考煤样的程序。 注:在本国际标准中，术语“硬煤”用于表示煤化序列中的成熟度或等级，与煤的物理性质无关。

ISO 5074:2015 specifies the method for determining the grindability index of hard coal using the Hardgrove machine. It also specifies the procedure for calibrating the test machine and for preparing the standard reference coal samples. NOTE In this International Standard, the term "hard coal" is used as an indication of maturity or rank in the coalification sequence and is not related to the physical properties of the coal.