This report describes a EURAMET supplementary comparison in Brinell hardness scales of three national metrology institutes of Italy, Turkey and Germany; INRiM, UME and PTB, respectively. The pilot laboratory is INRiM in the comparison where two sets of hardness reference blocks for the Brinell Hardness scales of HBW1/30 and HBW2.5/187.5 were used. Each set of blocks consists of three hardness levels used for each of the two scales. The comparison was realized as planned in the Technical Protocol with some delay. The measurement results and uncertainty assessments declared by INRiM, UME and PTB are in consistency with each other.

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本报告描述了 EURAMET 对意大利、土耳其和德国三个国家计量院布氏硬度标度的补充比较；分别为 INRiM、UME 和 PTB。中试实验室是 INRiM 进行比较，其中使用了两组布氏硬度标尺 HBW1/30 和 HBW2.5/187.5 的硬度参考块。每组块由三个硬度等级组成，用于两个等级中的每一个。比较是按技术协议中的计划实现的，但有一些延迟。INRiM、UME和PTB声明的测量结果和不确定性评估相互一致。

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根据 CIPM 互认安排 (CIPM MRA) 的规定，最终报告已通过同行评审并由 CCM 批准发布。