BS EN ISO 4545-1:2023 – TC

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Tracked Changes. Metallic materials. Knoop hardness test – Test method

Published By	Publication Date	Number of Pages
BSI	2023	81

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Categories: 77.040.10 - Mechanical testing of metals, BSI

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ISO 4545-1:2017 specifies the Knoop hardness test method for metallic materials for test forces from 0,009 807 N to 19,613 N. The Knoop hardness test is specified in this document for lengths of indentation diagonals ≥0,020 mm. Using this method to determine Knoop hardness from smaller indentations is outside the scope of this document as results would suffer from large uncertainties due to the limitations of optical measurement and imperfections in tip geometry. ISO 14577-1 allows the determination of hardness from smaller indentations. A periodic verification method is specified for routine checking of the testing machine in service by the user. Special considerations for Knoop testing of metallic coatings can be found in ISO 4516.

PDF Catalog

PDF Pages	PDF Title
47	undefined
53	4.1 Symbols and designations used in this document 4.2 Designation of hardness number
54	6.1 Testing machine 6.2 Indenter 6.3 Diagonal measuring system
55	7.1 Test surface 7.2 Preparation 7.3 Thickness 7.4 Support of unstable test pieces 7.5 Metallic and other inorganic coatings
56	8.1 Test temperature 8.2 Test force 8.3 Periodic verification 8.4 Test piece support 8.5 Focus on test surface
57	8.6 Test force application 8.7 Prevention of the effect of shock or vibration 8.8 Minimum distance between adjacent indentations
58	8.9 Measurement of diagonal length 8.10 Calculation of hardness value