GB/T 230.2-2022 Translated English of Chinese Standard (GB/T 230.2-2022, GBT230.2-2022): Metallic materials - Rockwell hardness test - Part 2: Verification and calibration of testing machines and indenters
https://www.chinesestandard.net, Jan 21, 2023 - Technology & Engineering - 34 pages
This document specifies two inspection methods (direct inspection and indirect inspection) of the Rockwell durometer, for determining the Rockwell hardness, according to GB/T 230.1; specifies the inspection method of the Rockwell hardness indenter. The direct test method is suitable for checking whether the main parameters related to the function of the durometer are within the specified tolerances, such as test force, depth measurement, test cycle time. The indirect test method is suitable for using a set of calibrated reference blocks, to determine the performance of the durometer, when measuring materials with known hardness. The indirect test method can be used alone for regular routine inspections, using medium durometers. If the durometer can also be used for the hardness test of other hardness test methods, the durometer shall be tested separately, according to each method. This document applies to both stationary durometers and portable durometers. Note that tungsten carbide alloy ball indenters have been considered as Rockwell hardness standard ball indenters. The steel ball indenter is limited to use, under the conditions of Appendix A in GB/T 230.1-2018.
angle Appendix Applies average hardness value axis calculated according calibration and inspection calibration certificate carried certified reference material checked combination component deformation depth measuring device depth value determine deviation diamond indenter difference direct directly displacement document ensure example exceed expanded uncertainty force F1 force measuring GB/T given Hardness range corresponding hysteresis indentation depth measuring indenter seat indication error indirect inspection initial test force least less limit marked maximum tolerance means measurement uncertainty measurement value meets the requirements Metallic materials Nominal hardness value nominal value Note performance position procedure produce provisions readings reference block relative error repeatability resolution Rockwell durometer Rockwell hardness scales Rockwell hardness test selected specified specified in Table spherical surface superficial Rockwell hardness Table Table B.4 temperature range test cycle test force test method Testing Instrument third tungsten carbide alloy value Hardness range