prEN ISO 6506-2

SLOVENSKI STANDARD
01-december-2023
Kovinski materiali - Preskus trdote po Brinellu - 2. del: Preverjanje in umerjanje
naprav za preskušanje (ISO/DIS 6506-2:2023)
Metallic materials - Brinell hardness test - Part 2: Verification and calibration of testing
machines (ISO/DIS 6506-2:2023)
Metallische Werkstoffe - Härteprüfung nach Brinell - Teil 2: Überprüfung und Kalibrierung
der Prüfmaschinen (ISO/DIS 6506-2:2023)
Matériaux métalliques - Essai de dureté Brinell - Partie 2: Vérification et étalonnage des
machines d'essai (ISO/DIS 6506-2:2023)
Ta slovenski standard je istoveten z: prEN ISO 6506-2
ICS:
77.040.10 Mehansko preskušanje kovin Mechanical testing of metals
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT INTERNATIONAL STANDARD
ISO/DIS 6506-2
ISO/TC 164/SC 3 Secretariat: DIN
Voting begins on: Voting terminates on:
2023-10-23 2024-01-15
Metallic materials — Brinell hardness test —
Part 2:
Verification and calibration of testing machines
Matériaux métalliques — Essai de dureté Brinell —
Partie 2: Vérification et étalonnage des machines d'essai
ICS: 77.040.10
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
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NATIONAL REGULATIONS.
ISO/DIS 6506-2:2023(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
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NOTIFICATION OF ANY RELEVANT PATENT
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PROVIDE SUPPORTING DOCUMENTATION. © ISO 2023

ISO/DIS 6506-2:2023(E)
DRAFT INTERNATIONAL STANDARD
ISO/DIS 6506-2
ISO/TC 164/SC 3 Secretariat: DIN
Voting begins on: Voting terminates on:

Metallic materials — Brinell hardness test —
Part 2:
Verification and calibration of testing machines
Matériaux métalliques — Essai de dureté Brinell —
Partie 2: Vérification et étalonnage des machines d'essai
ICS: 77.040.10
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
© ISO 2023
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
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NATIONAL REGULATIONS.
Website: www.iso.org ISO/DIS 6506-2:2023(E)
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ii
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2023

ISO/DIS 6506-2:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General conditions .1
5 Direct verification . 2
5.1 General . 2
5.2 Verification of the test forces . 2
5.3 Measurement and verification of the properties of the indenter ball . 3
5.4 Calibration of the indentation diameter measuring system . 3
5.5 Verification of the testing cycle . 4
6 Indirect verification .4
7 Intervals between verifications .6
8 Verification report/calibration certificate . 6
Annex A (informative) Uncertainty of measurement of the verification results of the
hardness testing machine .8
Annex B (normative) Verification of hardness testing machines that are incapable of
meeting the specified force/time profile .15
Bibliography .16
iii
ISO/DIS 6506-2:2023(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals,
Subcommittee SC 3, Hardness testing.
This fourth edition cancels and replaces the third edition (ISO 6506-2:2017), which has been technically
revised.
The main changes compared to the previous edition are as follows:
At least the following:
— “error” has been replaced by “bias” in Table 3;
— the requirement for indirect verification has been amended in Clause 7;
— editorial changes have been introduced.
A list of all parts in the ISO 6506 series can be found on the ISO website.
iv
DRAFT INTERNATIONAL STANDARD ISO/DIS 6506-2:2023(E)
Metallic materials — Brinell hardness test —
Part 2:
Verification and calibration of testing machines
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 shall 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.
2 Normative references
This document is applicable to both fixed location and portable hardness testing machines. This
document is applicable to both fixed location and portable hardness testing machines including
machines that are incapable of satisfying the specified force-time profile, for which a prescribed
modified procedure for the direct verification of force and testing cycle is provided.
The following documents 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, 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
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https:// www .electropedia .org/
— ISO Online browsing platform: available at https:// www .iso .org/ obp
4 General conditions
Before a Brinell hardness testing machine is verified, the machine shall be checked to ensure that it is
properly set up in accordance with the manufacturer's instructions.
ISO/DIS 6506-2:2023(E)
Especially, it should be checked that:
a) the mount holding the ball-holder slides correctly in its guide;
b) every ball-holder with a ball used during the calibration is firmly held in the mount;
c) the test force is applied and removed without shock, vibration, or overrun and in such a manner
that the readings are not influenced; and
d) if the indentation diameter measuring system is integrated into the machine,
— the change from removing the test force to measuring mode does not affect the diameter
measurements,
— the illumination is suitable for making the diameter measurements, and — the centre of the
indentation is in the centre of the field of view, if necessary.
5 Direct verification
5.1 General
5.1.1 Direct verification should be carried out at a temperature of (23 ± 5) °C. If the verification is
made outside this temperature range, this shall be reported in the verification report.
5.1.2 The instruments used for verification shall be traceable to the SI with the exception of hardness,
which shall be traceable to National Standards.
5.1.3 Direct verification involves:
a) verification of the test forces;
b) verification of the diameter, hardness, and density of the indenter ball;
c) calibration of the indentation diameter measuring system; and
d) verification of the testing cycle.
For each of the above items, direct verification also includes assessment of the results against the
specified tolerances.
5.2 Verification of the test forces
5.2.1 All test forces for which the machine shall be used, shall be verified. If it can be demonstrated
that the indenter position does not affect the applied force, this shall be done in at least one position
of the indenter, otherwise it shall be done at not less than three positions of the indenter, uniformly
spaced throughout its range of movement during testing. The test forces that have been verified shall
be listed o
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