DIN EN ISO 6506-2:2015-02

This part of ISO 6506 specifies methods of direct and indirect verification and calibration of testing machines used for determining Brinell hardness in accordance with ISO/FDIS 6506-1:2014, and also specifies when these two types of testing has to be performed. The direct calibration involves checking that individual machine performance parameters fall within specified limits whereas the indirect calibration utilizes hardness measurements of reference blocks, calibrated in accordance with ISOFDIS 6506-3:2014, to check the machine´s overall performance. If a testing machine is also to be used for other methods of hardness testing, it has to be verified independently for each method. This part of ISO 6506 is applicable to both fixed location and portable hardness testing machines. For machines that are incapable of satisfying the specified force-time profile, the direct verification of force and testing cycle can be modified by the use of Annex B. This document (FprEN ISO 6506-2:2014) has been prepared by Technical Committee ISO/TC 164 "Mechanical testing of metals", Subcommittee SC 3 "Hardness testing" (secretariat: DIN, Germany) and has been adopted by Technical Committee ECISS/TC 101 "Test methods for steel (other than chemical analysis)" (secretariat: AFNOR, France) in accordance with the Vienna Agreement. The responsible German body is Working Committee NA 062-01-41 AA "Härteprüfung für Metalle" ("Hardness testing for metals") at the Materials Testing Standards Committee (NMP).