oSIST prEN ISO 6506-3:2023

SLOVENSKI STANDARD
01-december-2023
Kovinski materiali - Preskus trdote po Brinellu - 3. del: Umerjanje primerjalnih
ploščic (ISO/DIS 6506-3:2023)
Metallic materials - Brinell hardness test - Part 3: Calibration of reference blocks
(ISO/DIS 6506-3:2023)
Metallische Werkstoffe - Härteprüfung nach Brinell - Teil 3: Kalibrierung von
Härtevergleichsplatten (ISO/DIS 6506-3:2023)
Matériaux métalliques - Essai de dureté Brinell - Partie 3: Étalonnage des blocs de
référence (ISO/DIS 6506-3:2023)
Ta slovenski standard je istoveten z: prEN ISO 6506-3
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 6506-3
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 3:
Calibration of reference blocks
Matériaux métalliques — Essai de dureté Brinell —
Partie 3: Étalonnage des blocs de référence
ICS: 77.040.10
This document is circulated as received from the committee secretariat.
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NATIONAL REGULATIONS.
ISO/DIS 6506-3:2023(E)
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NOTIFICATION OF ANY RELEVANT PATENT
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ISO/DIS 6506-3:2023(E)
DRAFT INTERNATIONAL STANDARD
ISO/DIS 6506-3
ISO/TC 164/SC 3 Secretariat: DIN
Voting begins on: Voting terminates on:

Metallic materials — Brinell hardness test —
Part 3:
Calibration of reference blocks
Matériaux métalliques — Essai de dureté Brinell —
Partie 3: Étalonnage des blocs de référence
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 6506-3:2023(E)
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ii
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2023

ISO/DIS 6506-3:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Manufacture of reference blocks . 1
4 Calibration machine .2
5 Calibration procedure . 3
6 Number of indentations . 3
7 Non-uniformity of reference block . 4
8 Marking . . 4
9 Validity . 5
Annex A (informative) Uncertainty of the mean hardness value of reference blocks .6
Bibliography .10
iii
ISO/DIS 6506-3:2023(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 meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO's adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 164, Mechanical testing of metals, Subcommittee
SC 3, Hardness testing.
This third edition cancels and replaces the second edition (ISO 6506-3:2005), which has been technically
revised.
ISO 6506 consists of the following parts, under the general title Metallic materials — Brinell hardness
test:
— Part 1: Test method
— Part 2: Verification and calibration of testing machines
— Part 3: Calibration of reference blocks
— Part 4: Tables of hardness values
iv
DRAFT INTERNATIONAL STANDARD ISO/DIS 6506-3:2023(E)
Metallic materials — Brinell hardness test —
Part 3:
Calibration of reference blocks
1 Scope
This part of ISO 6506 specifies a method for the calibration of reference blocks to be used in the indirect
verification of Brinell hardness testing machines as described in ISO 6506-2.
The procedures necessary to ensure metrological traceability of the calibration machine are also
specified.
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 6506-2:2014, Metallic materials — Brinell hardness test — Part 2: Verification and calibration of
testing machines
3 Manufacture of reference blocks
3.1 The block shall be specially manufactured for use as a reference block.
NOTE Attention is drawn to the need to use a manufacturing process which will give the necessary
homogeneity, stability of structure, and uniformity of surface hardness.
3.2 Each metal block to be calibrated shall be of a thickness not less than
— 16 mm for 10 mm balls, for HBW ≤ 150
— 12 mm for 10 mm balls, for HBW > 150
— 12 mm for 5 mm balls, or
— 6 mm for smaller balls.
3.3 The reference blocks shall be free of magnetism. It is recommended that the manufacturer shall
ensure that the blocks, if of steel, have been demagnetized at the end of the manufacturing process.
ISO/DIS 6506-3:2023(E)
3.4 The flatness of the two surfaces and the parallelism of the reference block shall be in accordance
with Table 1.
Table 1 — Requirements for the reference blocks
Permissible surface roughness
Tolerance in
Tolerance in flatness a
Ra
Diameter of ball parallelism
of the surfaces
µm
mm mm
mm
over 50 mm
Test surface Bottom surface
10 0,040 0,050 0,3 0,8
5 0,030 0,040 0,2 0,8
2,5 0,020 0,030 0,1 0,8
1,0 0,020 0,030 0,05 0,8
a
Sampling length: l = 0,80 mm (see ISO 4287).
3.5 The test surface shall be free from scratches which interfere with the measurement of the
indentations (see Table 1).
3.6 To verify that no material is subsequently removed from the reference block, the thickness at the
time of calibration shall be marked on it to the nearest 0,1 mm, or an identifying mark shall be made on
the test surface [see 8.1, item e)].
4 Calibration machine
4.1 In addition to fulfilling the general requirements specified in ISO 6506-2:2014, Clause 3, the
calibration machine shall also meet the requirements given in 4.2 to 4.7.
4.2 The machine shall be verified directly in intervals not exceeding 12 months.
Direct verification involves
a) measurement of the test forces,
b) measurement of the diameter, hardness, and density of the indenter ball,
c) calibration of the indentation diameter measuring device, and
d) measurement of the testing cycle, if this is not possible, at least the force versus time behaviour.
4.3 The instruments used for verification and calibration shall be traceable to the SI.
4.4 Each test force shall be measured a minimum of three t
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