JSA JIS B 7726

Abstract

This Standard specifies two separate methods of verification of testing machines (direct and indirect) for determining Rockwell hardness in accordance with JIS Z 2245. This Standard is applicable to stationary and portable Rockwell hardness and Rockwell superficial hardness testing machines (hereafter referred to as testing machines) related to metal materials. NOTE 1 Attention is drawn to the fact, in ISO 6508-1 : 2015, that the use of tungsten carbide composite for ball indenters (hereafter referred to as hardmetal ball) is considered to be the standard type of Rockwell indenter ball. Steel indenter balls may continue to be used only when complying with ISO 6508-1, Annex A. This Standard is intended to adopt hardmetal balls as the standard intenter at the time of next revision NOTE 2 Attention is drawn to the fact that the result obtained with hardmetal balls may be significantly different from the result obtained with a steel balls NOTE 3 Rockwell hardnesses are classified into Rockwell regular hardness and Rockwell superficial hardness is ISO 6508-1 while they are respectively described as "Rockwell hardness" and "Rockwell superficial hardness" in this Standard NOTE 4 The International Standard corresponding to this Standard and the symbol of degree of correspondence are as follows. ISO 6508-2 : 2015 Metallic materials - Rockwell hardness test - Part 2 : Verification and calibration of testing machines and indenters (MOD) In addition, symbols which denote the degree of correspondence in the contents between the relevant International Standard and JIS are IDT (identical), MOD (modified), and NEQ (not equivalent) according to ISO/lEC Guide 21-1.