Metallic materials - Brinell hardness test - Part 2: Verification and calibration of testing machines (ISO 6506-2:2014)

ISO 6506-2:2014 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.
ISO 6506-2:2014 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.

Metallische Werkstoffe - Härteprüfung nach Brinell - Teil 2: Überprüfung und Kalibrierung der Prüfmaschinen (ISO 6506-2:2014)

In diesem Teil von ISO 6506 sind die Verfahren für die direkte und indirekte Überprüfung von Härteprüfmaschinen zur Bestimmung der Brinellhärte nach ISO 6506-1 festgelegt und auch, wann diese beiden Arten der Überprüfung durchzuführen sind.
Bei der direkten Überprüfung wird überprüft, dass einzelne Maschinenleistungsparameter innerhalb festgelegter Grenzbereiche liegen, während bei der indirekten Überprüfung Härtemessungen auf nach ISO 6506-3 kalibrierten Härtevergleichsplatten, zur Prüfung der Funktionsfähigkeit der Härteprüf¬maschine, durchgeführt werden.
Wird eine Härteprüfmaschine auch für andere Härteprüfverfahren verwendet, muss sie unabhängig für jedes Verfahren überprüft werden.
Dieser Teil von ISO 6506 ist anwendbar auf ortsgebundene und ortsveränderliche Härteprüfmaschinen. Für Prüfmaschinen, die außerstande sind, das festgelegte Kraft-Zeit-Profil zu erfüllen, kann die direkte Überprüfung des Kraft- und Zeitzyklus durch Anwendung von Anhang B modifiziert werden.

Matériaux métalliques - Essai de dureté Brinell - Partie 2: Vérification et étalonnage des machines d'essai (ISO 6506-2:2014)

L'ISO 6506-2 :2014 spécifie des méthodes de vérifications directe et indirecte des machines d'essai utilisées pour la détermination de la dureté Brinell conformément à l'ISO 6506‑1 et spécifie également quand ces deux types de vérification doivent être réalisées.
La vérification directe implique de contrôler que les paramètres individuels de performance de la machine se situent à l'intérieur des limites spécifiées alors que la vérification indirecte utilise des mesurages de dureté de blocs de référence, étalonnés conformément à l'ISO 6506‑3 pour contrôler la performance globale de la machine.
Si une machine d'essai est également à utiliser pour d'autres méthodes d'essai de dureté, elle doit être vérifiée indépendamment pour chaque méthode.
L'ISO 6506-2 :2014 est applicable aux machines d'essai de dureté d'implantation fixe et portables. Pour les machines ne permettant pas de respecter le profil force-temps spécifié, la vérification directe de la force et du cycle d'essai peut être modifiée en utilisant l'Annexe B.

Kovinski materiali - Preskus trdote po Brinellu - 2. del: Preverjanje in umerjanje naprav za preskušanje (ISO 6506-2:2014)

Ta del standarda ISO 6506 določa metode neposrednega in posrednega preverjanja naprav za preskušanje, ki se uporabljajo za ugotavljanje trdote po Brinellu v skladu s standardom ISO 6506‑1, ter določa tudi, kdaj je treba ti dve vrsti preverjanja izvesti.
Neposredno preverjanje vključuje preverjanje, da posamezni parametri delovanja naprave ne presegajo določenih mejnih vrednosti, medtem ko posredno preverjanje temelji na meritvah trdote referenčnih ploščic, umerjenih v skladu s standardom ISO 6506‑3, da se preveri splošno delovanje naprave. Če se naprava za preskušanje uporablja tudi za druge metode preskusa trdote, jo je treba preveriti posebej za vsako metodo.
Ta del standarda ISO 6506 se uporablja za nepremične in premične naprave za preskušanje trdote. Za naprave, ki ne morejo izpolnjevati določenega profila sila/čas, se lahko neposredno preverjanje sile in preskusnega cikla spremeni z uporabo dodatka B.

General Information

Status
Withdrawn
Publication Date
23-Sep-2014
Withdrawal Date
18-Dec-2018
Current Stage
9960 - Withdrawal effective - Withdrawal
Completion Date
19-Dec-2018

RELATIONS

Buy Standard

Standard
EN ISO 6506-2:2014
English language
22 pages
sale 10% off
Preview
sale 10% off
Preview

e-Library read for
1 day

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN ISO 6506-2:2014
01-december-2014
1DGRPHãþD
SIST EN ISO 6506-2:2006

Kovinski materiali - Preskus trdote po Brinellu - 2. del: Preverjanje in umerjanje

naprav za preskušanje (ISO 6506-2:2014)

Metallic materials - Brinell hardness test - Part 2: Verification and calibration of testing

machines (ISO 6506-2:2014)

Metallische Werkstoffe - Härteprüfung nach Brinell - Teil 2: Prüfung und Kalibrierung der

Prüfmaschinen (ISO 6506-2:2014)

Matériaux métalliques - Essai de dureté Brinell - Partie 2: Vérification et étalonnage des

machines d'essai (ISO 6506-2:2014)
Ta slovenski standard je istoveten z: EN ISO 6506-2:2014
ICS:
77.040.10 Mehansko preskušanje kovin Mechanical testing of metals
SIST EN ISO 6506-2:2014 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 6506-2:2014
---------------------- Page: 2 ----------------------
SIST EN ISO 6506-2:2014
EUROPEAN STANDARD
EN ISO 6506-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2014
ICS 77.040.10 Supersedes EN ISO 6506-2:2005
English Version
Metallic materials - Brinell hardness test - Part 2: Verification and
calibration of testing machines (ISO 6506-2:2014)

Matériaux métalliques - Essai de dureté Brinell - Partie 2: Metallische Werkstoffe - Härteprüfung nach Brinell - Teil 2:

Vérification et étalonnage des machines d'essai (ISO 6506- Überprüfung und Kalibrierung der Prüfmaschinen (ISO

2:2014) 6506-2:2014)
This European Standard was approved by CEN on 30 August 2014.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European

Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national

standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same

status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United

Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6506-2:2014 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 6506-2:2014
EN ISO 6506-2:2014 (E)
Contents Page

Foreword ..............................................................................................................................................................3

---------------------- Page: 4 ----------------------
SIST EN ISO 6506-2:2014
EN ISO 6506-2:2014 (E)
Foreword

This document (EN ISO 6506-2:2014) has been prepared by Technical Committee ISO/TC 164 “Mechanical

testing of metals” in collaboration with Technical Committee ECISS/TC 101 “Test methods for steel (other

than chemical analysis)” the secretariat of which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of an identical

text or by endorsement, at the latest by March 2015, and conflicting national standards shall be withdrawn at

the latest by March 2015.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 6506-2:2005.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following

countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech

Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,

Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,

Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

Endorsement notice

The text of ISO 6506-2:2014 has been approved by CEN as EN ISO 6506-2:2014 without any modification.

---------------------- Page: 5 ----------------------
SIST EN ISO 6506-2:2014
---------------------- Page: 6 ----------------------
SIST EN ISO 6506-2:2014
INTERNATIONAL ISO
STANDARD 6506-2
Third edition
2014-10-01
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
Reference number
ISO 6506-2:2014(E)
ISO 2014
---------------------- Page: 7 ----------------------
SIST EN ISO 6506-2:2014
ISO 6506-2:2014(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2014

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2014 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 6506-2:2014
ISO 6506-2:2014(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 General conditions ............................................................................................................................................................................................. 1

4 Direct verification ............................................................................................................................................................................................... 2

4.1 General ........................................................................................................................................................................................................... 2

4.2 Measurement of the test forces ................................................................................................................................................ 2

4.3 Measurement of the properties of the indenter ball .............................................................................................. 2

4.4 Calibration of the indentation diameter measuring system ............................................................................ 3

4.5 Verification of the testing cycle ................................................................................................................................................. 4

5 Indirect verification .......................................................................................................................................................................................... 4

6 Intervals between verifications ............................................................................................................................................................ 5

7 Verification report/calibration certificate ................................................................................................................................ 6

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

testing machine ...................................................................................................................................................................................................... 7

Annex B (normative) Verification of hardness testing machines that are incapable of meeting the

specified force/time profile ...................................................................................................................................................................14

Bibliography .............................................................................................................................................................................................................................15

© ISO 2014 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 6506-2:2014
ISO 6506-2:2014(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 6506-2:2005), 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: Table of hardness values
iv © ISO 2014 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 6506-2:2014
INTERNATIONAL STANDARD ISO 6506-2:2014(E)
Metallic materials — Brinell hardness test —
Part 2:
Verification and calibration of testing machines
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
3 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.
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 influence the diameter

measurements,
© ISO 2014 – All rights reserved 1
---------------------- Page: 11 ----------------------
SIST EN ISO 6506-2:2014
ISO 6506-2:2014(E)
— the illumination does not affect the diameter measurements, and

— the centre of the indentation is in the centre of the field of view, if necessary.

4 Direct verification
4.1 General

4.1.1 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.

4.1.2 The instruments used for verification shall be traceable to the SI.
4.1.3 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 system, and
d) measurement of the testing cycle.

For each of the above items, direct verification also includes assessment of the results against the

specified tolerances.
4.2 Measurement of the test forces

4.2.1 Each test force shall be measured within the working range of the testing machine. When the

force is applied in open-loop mode by a lever or other system employing a mechanical advantage, this

shall be done at no fewer than three positions of the indenter uniformly spaced throughout its range of

movement during testing.

4.2.2 Three measurements shall be made for each force at each position of the indenter. Immediately

before each measurement is taken, the indenter shall be moved in the same direction as during testing.

4.2.3 The force shall be measured by one of the following two methods:

— by means of a force-proving instrument in accordance with ISO 376 Class 1 or better;

— by balancing against a force, accurate to ±0,2 %, applied by means of calibrated masses or another

method with the same accuracy.

4.2.4 Each measurement of a force shall be within ±1,0 % of the nominal test force (see Formula A.2),

as defined in ISO 6506-1.
4.3 Measurement of the properties of the indenter ball

4.3.1 The indenter consists of a ball and an indenter holder. The verification applies only to the ball.

4.3.2 For the purpose of verifying the size and the hardness of the balls, a minimum of two balls, selected

at random from a batch, shall be tested. Each sampled ball shall be verified for size and hardness and then

discarded.
4.3.3 The balls shall be polished and free from surface defects.
2 © ISO 2014 – All rights reserved
---------------------- Page: 12 ----------------------
SIST EN ISO 6506-2:2014
ISO 6506-2:2014(E)

4.3.4 The user shall either measure the balls to ensure that they meet the following requirements or

shall obtain balls from a supplier certifying that the following conditions are met.

4.3.4.1 The diameter shall be determined by taking the mean value of not less than three single values

of diameter measured at different positions on the ball. No single value shall differ from the nominal

diameter by more than the tolerance given in Table 1.
Table 1 — Tolerances for the different ball diameters
Ball diameter Tolerance
mm mm
10 ±0,005
5 ±0,004
2,5 ±0,003
1 ±0,003

4.3.4.2 The characteristics of the tungsten carbide composite balls shall be as follows:

a) Hardness: The hardness shall be not less than 1 500 HV, when determined in accordance with

ISO 6507-1. The tungsten carbide composite ball can be tested directly on its spherical surface or by

sectioning the ball and testing on the ball interior.
b) Density: ρ = (14,8 ± 0,2) g/cm .

The density can be determined from the sampled balls, prior to hardness testing, or from the whole

batch. The following chemical composition is recommended:
— tungsten carbide (WC): balance;
— total other carbides: 2,0 %;
— cobalt (Co): 5,0 % to 7,0 %.
4.4 Calibration of the indentation diameter measuring system

4.4.1 For systems where the indentation diameter is measured directly, the scale of the system

shall be graduated to permit estimation of the diameter to within ±0,5 %. The indentation diameter

measuring system shall be calibrated for every objective lens, and for each incorporated line scale, in

two perpendicular measurement axes (if applicable), by measurements made on a standard scale at

a minimum of four intervals, arranged centrally in the field of view, for each working range. For each

measurement, the magnitude of the difference between the measured and reference values shall not be

greater than 0,5 % (see Formula A.7).

4.4.2 For systems where the indentation diameter is calculated from a measurement of projected area,

the system shall be calibrated for every objective lens by measurements of a range of at least four standard

circular reference images covering the range of areas measured. The maximum error shall not exceed 1 %

of the area.

4.4.3 All systems shall also be verified by making measurements of certified reference indentations,

such as those on hardness reference blocks calibrated in accordance with ISO 6506-3. For each ball size,

at least four indentations, covering the working range of diameters, shall be measured by each objective

lens. During these measurements, the type of illumination shall remain unchanged. No mean measured

diameter shall differ from the certified mean diameter of the reference indentation by more than 0,5 %.

© ISO 2014 – All rights reserved 3
---------------------- Page: 13 ----------------------
SIST EN ISO 6506-2:2014
ISO 6506-2:2014(E)
4.5 Verification of the testing cycle

4.5.1 The testing cycle is to be verified by the testing machine manufacturer at the time of manufacture

and when the testing machine undergoes repair which might have affected the testing cycle. Verification

of the testing cycle at other times is as specified in Table
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.