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JIS B 7726

2017 Edition, August 21, 2017

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Rockwell hardness test - Verification and calibration of testing machines and indenters



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Product Details:

  • Revision: 2017 Edition, August 21, 2017
  • Published Date: August 21, 2017
  • Status: Active, Most Current
  • Document Language: English
  • Published By: Japanese Standards Association (JSA)
  • Page Count: 34
  • ANSI Approved: No
  • DoD Adopted: No

Description / 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.