International Standard ISO 6506-2: 2017

Metallic materials — Brinell hardness test —

Part 2:

Verification and calibration of testing machines

ISO 6506 consists of the following parts, under the general title Metallic materials —— Brinell hardness test:

ISO 6506-1 Metallic materials —— Brinell hardness test Part 1: Test method

ISO 6506-2 Metallic materials —— Brinell hardness test Part 2: Verification and calibration of testing machines and indenters

ISO 6506-3 Metallic materials —— Brinell hardness test Part 3: Calibration of refernce blocks

ISO 6506-4 Metallic materials —— Brinell hardness test Part 4: Table of hardness values

Contents

1  Scope 

2  Normative references 

3  Terms and definitions 

4  General conditions 

5  Direct verification 

    5.1  General

    5.2  Measurement of the test forces 

    5.3  Measurement of the properties of the indenter ball

    5.4  Calibration of the indentation diameter measuring system 

    5.5  Verification of the testing cycle 

6  Indirect verification 

7  Intervals between verifications 

8  Verification report/calibration certificate 

Annex A (informative) Uncertainty of measurement of the verification results of the hardness testing machine 

Annex B (normative) Verification of hardness testing machines that are incapable of meeting the specified force/time profile 

Bibliography

1 Scope

This document specifies methods of direct and indirect verification of testing machines used for determining Brinell hardness in accordance with ISO 6506-1 and also specifies when these two types of verification have to be performed.

The direct verification involves checking that individual machine performance paramets fall within specified limits whereas the indirect verification utilizes hardness measurements of reference blocks,calibrated in accordance with ISO 6506-3, 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 document is applicable to both fixed location and portable hardness testing machines. For machines that are incapable of satisfying the specified force and testing cycle can be modified by the use of Annex B.

2 Normative references

The following docuents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 376, Metallic materials — Calibration of force-proving instruments used for the verification of uniaxial

testing machines

ISO 6506-1:2014, Metallic materials — Brinell hardness test — Part 1: Test method

ISO 6506-3, Metallic materials — Brinell hardness test — Part 3: Calibration of reference blocks

ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method