International Standard  ISO 6506-2:2014(E)

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

Contents

Foreword

1 Scope

2 Normative references

3 General conditions

4 Direct verification

4.1 General

4.2 Measurement of the test forces

4.3 Measurement of the properties of the indenter ball

4.4 Calibration of the indentation diameter measuring system

4.5 Verification of the testing cycle

5 Indirect verification

6 Intervals between verifications

7 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 part of ISO 6506 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 has to be performed.

The direct verification involves checking that individual machine performance parameters 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 part of ISO 6506 is applicable to both fixed location and portable hardness testing machines. For

machines that are incapable of satisfying the specified force-time profile, the direct verification of force and testing cycle can be modified by the use of Annex B.

2  Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. 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

相关标准

国家标准GB/T 231.2-2012《金属材料 布氏硬度试验 第2部分：硬度计的检验与校准》

       本标准使用重新起草法修改采用国际标准ISO6506-2:2005《金属材料 布氏硬度试验 第2部分:硬度计的检验与校准》(第二版),在文本结构和技术内容方面与ISO6506-2:2005一致。 

       本标准与ISO6506-2:2005的技术性差异及其原因如下: 

       —— 删除了ISO6506-2:2005的前言,重新编写了前言; 

       —— 关于规范性引用文件,本部分做了具有技术性差异的调整,以适应我国的技术条件,调整的内容集中反映在第2章“规范性引用文件”中,具体调整如下: 

              ● 用修改采用国际标准的GB/T231.1代替ISO6506-1(见第1章、4.2.4、4.5、5.4和附录A); 

              ● 用修改采用国际标准的GB/T231.3代替ISO6506-3(见5.1); 

              ● 用修改采用国际标准的GB/T4340.1代替ISO6507-1(见4.3.4.2); 

              ● 用等同采用国际标准的GB/T13634代替ISO376(见4.2.3); 

       —— 将4.5中“时控误差最大允许值的指标”由“±1.0s”修改为“±0.5s”,以改正ISO6506-2:2005原文中4.5与A.1.4中该项技术指标不协调的错误(见4.5和附录A 的A.1.4); 

       —— 由于5.3的注中含有要求,故将该注变成了正文(见5.3); 

       —— 改正了附录A 的表A.1和A.5中一些错误的计算结果和数据,并在做过改正的地方用下划线注明; 

       —— 规范了附录A 中向公式里代入数值的一些计算式的表达方法; 

       —— 将附录A 的公式(A.10)、公式(A.13)和表A.9中的符号“b”用符号“E”替换; 

       —— 删除了参考文献。 

       本标准与ISO6506-2:2005相比存在技术性差异,这些差异涉及的条款已通过在其外侧页边空白位置的垂直单线(│)进行了标示。 

       本标准还做了下列编辑性修改: 

       —— 将“ISO6506的本部分”一词改为“本部分”;

       —— 用中文的小数点符号“.”代替英文的小数点符号“,”。