This part of GB/T 17394 specifies the calibration method of reference blocks used for indirect verification on Leeb hardness tester (hereafter referred to as "reference blocks").
2 Normative References
The following documents for the application of this document are essential. Any dated reference, just dated edition applies to this document. For undated references, the latest edition of the normative document (including any amendments) applies.
GB/T 231.2-2012 Metallic Materials - Brinell Hardness Test - Part 2: Verification and Calibration of Testing Machines (ISO 6506-2:2005, MOD)
GB/T 231.3-2012 Metallic Materials - Brinell Hardness Test - Part 3: Calibration of Reference Blocks (ISO 6506-3:2005, MOD)
GB/T 4340.2-2012 Metallic Materials - Vickers Hardness Test - Part 2: Verification and Calibration of Testing Machines (ISO 6507-2:2005, MOD)
GB/T 4340.3-2012 Metallic Materials - Vickers Hardness Test - Part 3: Calibration of Reference Blocks (ISO 6507-3:2005, MOD)
3 Manufacture of Reference Blocks
3.1 Reference blocks shall be manufactured specially. It shall pay much attention to the manufacturing process of reference blocks so as to make them obtain the material homogeneity, structure stability as well as hardness uniformity of tested surface.
3.2 See Table 1 for geometric dimensions and technical requirements of reference blocks.
