GB/T 18449.4-2009
AbolishedMetallic materials - Knoop hardness test - Part 4: Tables of hardness values
金属材料 努氏硬度试验 第4部分：硬度值表
Application Summary AI generated
This standard provides the reference tables for converting measured diagonal lengths into Knoop hardness values for metallic materials. It is applied in quality control and material testing laboratories to ensure consistent hardness evaluation of thin sheets, coatings, and brittle materials where micro-indentation testing is required.
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