EN ISO 6508-2:1999

Metallic materials - Rockwell hardness test - Part 2: Verification and calibration of testing machines (scales A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-2:1999)

Method of verification of testing machines for determining Rockwell hardness.

Metallische Werkstoffe - Härteprüfung nach Rockwell (Skalen A, B, C, D, E, F, G, H, K, N, T) - Teil 2: Prüfung und Härteprüfmaschinen (ISO 6508-2:1999)

In dieser Internationalen Norm ist das Verfahren für die Prüfung und Kalibrierung von Härteprüfmaschinen zur Bestimmung der Rockwellhärte (Skalen A, B, C, D, E, F, G, H, K, N, T) nach ISO 6508-1 festgelegt. In dieser Norm sind ein direktes Verfahren zur Prüfung von Hauptfunktionen der Maschine und ein indirektes Verfahren, das zur Ermittlung der Abweichung der Maschine geeignet ist, beschrieben. Das indirekte Verfahren kann für die regelmäßige Routineüberprüfung der Maschine beim Anwender angewendet werden.

Matériaux métalliques - Essai de dureté Rockwell - Partie 2:Vérification et étalonnage des machines d'essai (échelles A,B, C, D, E, F, G, H, K, N, T) (ISO 6508-2:1999)

Kovinski materiali - Preskus trdote po Rockwellu - 2. del: Preverjanje in kalibracija merilnikov trdote (skale A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-2:1999)

General Information

• Status: Withdrawn
• Publication Date: 31-Aug-1999
• Withdrawal Date: 14-Dec-2005
• ICS: 77.040.10 - Mechanical testing of metals
• Technical Committee: ECISS/TC 101 - Test methods for steel (other than chemical analysis)
• Drafting Committee: ECISS/TC 1 - Steel - Mechanical testing
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 15-Dec-2005
• Completion Date: 15-Dec-2005
• Ref Project: SIST EN ISO 6508-2:2000 - Metallic materials - Rockwell hardness test - Part 2: Verification and calibration of testing machines (scales A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-2:1999)

Relations

• Replaces: EN 10109-2:1994 - Metallic materials - Hardness test - Part 2: Verification of Rockwell hardness testing machines (scales A,B,C,D,E,F,G,H,K,N,T)
• Effective Date: 22-Dec-2008
• Replaced By: EN ISO 6508-2:2005 - Metallic materials - Rockwell hardness test - Part 2: Verification and calibration of testing machines (scales A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-2:2005)
• Effective Date: 22-Dec-2008

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 6508-2:2000
01-oktober-2000
1DGRPHãþD
SIST EN 10109-2:1996
Kovinski materiali - Preskus trdote po Rockwellu - 2. del: Preverjanje in kalibracija
merilnikov trdote (skale A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-2:1999)
Metallic materials - Rockwell hardness test - Part 2: Verification and calibration of testing
machines (scales A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-2:1999)
Metallische Werkstoffe - Härteprüfung nach Rockwell (Skalen A, B, C, D, E, F, G, H, K,
N, T) - Teil 2: Prüfung und Härteprüfmaschinen (ISO 6508-2:1999)
Matériaux métalliques - Essai de dureté Rockwell - Partie 2:Vérification et étalonnage
des machines d'essai (échelles A,B, C, D, E, F, G, H, K, N, T) (ISO 6508-2:1999)
Ta slovenski standard je istoveten z: EN ISO 6508-2:1999
ICS:
77.040.10 Mehansko preskušanje kovin Mechanical testing of metals
SIST EN ISO 6508-2:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 6508-2:2000

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SIST EN ISO 6508-2:2000

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SIST EN ISO 6508-2:2000

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SIST EN ISO 6508-2:2000

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SIST EN ISO 6508-2:2000

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SIST EN ISO 6508-2:2000
INTERNATIONAL ISO
STANDARD 6508-2
First edition
1999-09-01
Metallic materials — Rockwell hardness
test —
Part 2:
Verification and calibration of testing machines
(scales A, B, C, D, E, F, G, H, K, N, T)
Matériaux métalliques — Essai de dureté Rockwell —
Partie 2: Vérification et étalonnage des machines d'essai (échelles A, B, C,
D, E, F, G, H, K, N, T)
A
Reference number
ISO 6508-2:1999(E)

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SIST EN ISO 6508-2:2000
ISO 6508-2:1999(E)
Contents Page
1 Scope .1
2 Normative references .1
3 General conditions .2
4 Direct verification.2
5 Indirect verification.5
6 Intervals between verifications .8
7 Verification report/calibration certificate.8
Annex A (normative) Repeatability of testing machines.9
©  ISO 1999
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet [e-mail]
Printed in Switzerland
ii

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SIST EN ISO 6508-2:2000
© ISO
ISO 6508-2:1999(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
International Standard ISO 6508-2 was prepared by the Technical Committee ISO/TC 164, Mechanical testing of
metals, Subcommittee SC 3, Hardness testing.
This first edition of ISO 6508-2 cancels and replaces ISO 716:1986 and ISO 1079:1989, of which it constitutes a
technical revision as follows:
 Combination of the two different International Standards for the verification of the hardness testing machines
(ISO 716:1986 and ISO 1079:1989) into this part of ISO 6508.
 Addition of clause 6 concerning the intervals between the verifications.
 Addition of the hardmetal ball as indenter.
ISO 6508 consists of the following parts, under the general title Metallic materials — Rockwell hardness test:
 Part 1: Test method (scales A, B, C, D, E, F, G, H, K, N, T)
 Part 2: Verification and calibration of testing machines (scales A, B, C, D, E, F, G, H, K, N, T)

Part 3: Calibration of reference blocks (scales A, B, C, D, E, F, G, H, K, N, T)
Annex A forms a normative part of this part of ISO 6508.
iii

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SIST EN ISO 6508-2:2000
© ISO
ISO 6508-2:1999(E)
Introduction
The force values in this part of ISO 6508 were calculated from kilogram force values. They were introduced before
the SI-system was adopted. It was decided to keep the values based on the old units for this part of ISO 6508 but
for the next revision it will be necessary to consider the advantage of introducing rounded values of test force and
the consequence on the hardness scales.
Attention is drawn to the fact that in this part of ISO 6508, the use of hardmetal balls as indenters is equivalent to
the use of steel balls; however, it is indicated that the measurements made with the two ball types give different
results.
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SIST EN ISO 6508-2:2000
INTERNATIONAL STANDARD  © ISO ISO 6508-2:1999(E)
Metallic materials — Rockwell hardness test —
Part 2:
Verification and calibration of testing machines (scales A, B, C, D, E, F,
G, H, K, N, T)
1 Scope
This part of ISO 6508 specifies a method of verification of testing machines for determining Rockwell hardness
(scales A, B, C, D, E, F, G, H, K, N, T).
It specifies a direct method for checking the main functions of the machine and an indirect method suitable for the
overall checking of the machine. The indirect method may be used on its own for periodic routine checking of the
machine in service.
If a testing machine is also to be used for other methods of hardness testing, it shall be verified independently for
each method.
This part of ISO 6508 is applicable to portable hardness testing machines with the exception of requirements in
6.1 a) in which the word “relocation” does not apply.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this
part of ISO 6508. For dated references, subsequent amendments to, or revisions of, any of these publications do not
apply. However, parties to agreements based on this part of ISO 6508 are encouraged to investigate the possibility of
applying the most recent editions of the normative documents indicated below. For undated references, the latest
edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid
International Standards.
ISO 376, Metallic materials — Calibration of force-proving instruments used for verification of uniaxial testing
machines.
ISO 3878, Hardmetals — Vickers hardness test.
ISO 6507-1:1997, Metallic materials — Vickers hardness test — Part 1: Test method.
ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method (scales A, B, C, D, E, F, G, H, K,
N, T).
ISO 6508-3, Metallic materials — Rockwell hardness test — Part 3: Calibration of reference blocks (scales A, B, C,
D, E, F, G, H, K, N, T).
1

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SIST EN ISO 6508-2:2000
© ISO
ISO 6508-2:1999(E)
3 General conditions
Before a Rockwell hardness testing machine is verified, the machine shall be checked to ensure the following:
a) the machine is properly set up;
b) the plunger holding the indenter is capable of sliding in its guide;
c) the indenter-holder is firmly mounted in the plunger;
d) the test force can be applied and removed without shock or vibration and in such a manner that the readings
are not influenced;
e) the readings are not affected either by movements of the test piece or by deformation of the frame. When a
device is supplied, which locks the test piece against the upper part of the frame, the locking force shall exceed
the total test force. The influence of deformations may be checked by using a plunger with a spherical tip
(diameter of at least 10 mm), instead of the indenter, bearing against the anvil through a spacer and using the
locking device when it is supplied. The material of the plunger and of the spacer shall have a hardness of at
least 60 HRC. The readings of the measuring device (with preliminary force applied) before application and
after removal of the additional force shall not differ by more than 1,5 Rockwell units (without locking equipment)
and 0,5 Rockwell unit (with locking equipment).
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 of
this temperature range, this shall be reported in the verification report.
4.1.2  The instruments used for verification and calibration shall be traceable to the national standards.
4.1.3  Direct verification involves:
a) calibration of the test force;
b) verification of the indenter;
c) calibration of the depth-measuring device;
d) verification of the testing cycle.
4.2 Calibration of the test force
4.2.1  The preliminary test force F (see 4.2.4) and each total test force F used (see 4.2.5) shall be measured, and,
0
whenever applicable, this shall be done at no less than three positions of the plunger spaced throughout its range of
movement during testing. The preliminary test force shall be held for at least 2 s.
4.2.2  The forces shall be measured by one of the following two methods:
 measuring with a force-proving device of class 1 in accordance with ISO 376 or,
 balancing against a force, accurate to ± 0,2 %, applied using calibrated masses by mechanical means.
4.2.3  Three readings shall be taken for each force at each position of the plunger. Immediately before each
reading is taken, the plunger shall be moved in the same direction as during testing.
4.2.4  The tolerance on the preliminary test force F (before application and after removal of the additional test
0
force F ) shall be ± 2,0 %.
1
2

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SIST EN ISO 6508-2:2000
© ISO
ISO 6508-2:1999(E)
The tolerance on the total test force shall be ± 1,0 %. Each individual value of shall be within this
4.2.5  F F
tolerance.
4.3 Verification of the indenters
4.3.1 Diamond cone indenter (scales A, C, D, N)
To verify the reliable performance of the conical indenter in conformance with this part of ISO 6508 a direct and an
indirect verification shall be carried out.
4.3.1.1 Direct verification
4.3.1.1.1  The surfaces of the diamond cone and spherical tip shall be polished for a penetration depth of 0,3 mm
and shall blend in a truly tangential manner. Both surfaces shall be free from surface defects.
4.3.1.1.2  The verificat
...