ISO 4545 Metallic Materials - Knoop Hardness Test

Metal Test Laboratory

ISO 4545 Metallic Materials - Knoop Hardness Test

EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of ISO 4545 testing. ISO 4545 specifies the Knoop hardness test method for metallic materials for test forces of 0,009 807 N to 19,613 N.

ISO 4545 Metallic Materials - Knoop Hardness Test

The Knoop hardness test is specified in this standard for indentation diagonal lengths ≥0,020 mm. Using this method to determine Knoop hardness from small indentations is beyond the scope of this document as results will be affected by large uncertainties due to optical measurement limitations and imperfections in tip geometry. ISO 14577-1 enables the determination of hardness from smaller indentations.

A periodic verification method is determined for the routine control of the test machine in service by the user. Specific considerations for Knoop testing of metallic coatings can be found in ISO 4516.

The test should be performed on a polished surface that is smooth and flat, free from oxide scale and foreign matter, especially lubricants, unless otherwise specified in the product standards. The finish of the surface must allow an accurate determination of the diagonal length of the recess.

Surface preparation should be done in such a way as to prevent damage to the surface or change in surface hardness due to overheating or cold working. Due to the small depth of Knoop hardness indentations, it is important to take special precautions during preparation. It is recommended to use a polishing/electropolishing technique suitable for the material to be measured.

EUROLAB assists manufacturers with ISO 4545 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.

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