EN ISO 6508-1:1999

Metallic materials - Rockwell hardness test - Part 1: Test method (scales A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-1:1999)

Method of Rockwell and Rockwell superficial hardness tests for metallic materials.

Metallische Werkstoffe - Härteprüfung nach Rockwell (Skalen A, B, C, D, E, F, G, H, K, N, T) - Teil 1: Prüfverfahren (ISO 6508-1:1999)

In dieser Internationalen Norm ist das Verfahren zur Härteprüfung nach Rockwell für metallische Werkstoffe festgelegt (Skalen und Anwendungsbereiche nach Tabelle 1). Für Sonder-Werkstoffe und/oder Erzeugnisse gelten besondere Internationale Normen (z.B. ISO 3738-1 und ISO 4498-1). Anmerkung: Für besondere Werkstoffe kann der Anwendungsbereich eingeschränkter sein, als in dieser Norm angegeben.

Matériaux métalliques - Essai de dureté Rockwell - Partie 1:Méthode d'essai (échelles A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-1:1999)

Kovinski materiali - Preskus trdote po Rockwellu - 1. del: Preskusna metoda (skale A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-1:1999)

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• Status: Withdrawn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 6508-1:2000 - Metallic materials - Rockwell hardness test - Part 1: Test method (scales A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-1:1999)

Relations

• Replaces: EN 10109-1:1994 - Metallic materials - Hardness test - Part 1: Rockwell test (scales A,B,C,D,E,F,G,H,K) and Rockwell superficial test (scales 15N,30N,45N,15T,30T and 45T)
• Effective Date: 22-Dec-2008
• Replaced By: EN ISO 6508-1:2005 - Metallic materials - Rockwell hardness test - Part 1: Test method (scales A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-1:2005)
• Effective Date: 22-Dec-2008

Standards Content (Sample)

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

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SIST EN ISO 6508-1:2000

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SIST EN ISO 6508-1:2000

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SIST EN ISO 6508-1:2000

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SIST EN ISO 6508-1:2000
INTERNATIONAL ISO
STANDARD 6508-1
First edition
1999-09-01
Metallic materials — Rockwell hardness
test —
Part 1:
Test method (scales A, B, C, D, E, F, G, H, K,
N, T)
Matériaux métalliques — Essai de dureté Rockwell —
Partie 1: Méthode d'essai (échelles A, B, C, D, E, F, G, H, K, N, T)
A
Reference number
ISO 6508-1:1999(E)

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SIST EN ISO 6508-1:2000
ISO 6508-1:1999(E)
Contents Page
1 Scope .1
2 Normative reference .1
3 Principle.1
4 Symbols and designations .1
5 Testing machine.3
6 Test piece .4
7 Procedure .4
8 Uncertainty of the results .5
9 Test report .5
Annex A (normative) Conventional HR30Tm test for thin products .6
Annex B (normative) Minimum thickness of the test piece in relation to the Rockwell hardness .7
Annex C (normative) Corrections to be added to Rockwell hardness values obtained
on convex cylindrical surfaces.10
Annex D (normative) Corrections to be added to Rockwell hardness C scale values obtained
on spherical test surfaces of various diameters .12
Annex E (informative) Procedure for periodic checks of the testing machines by the user.13
Annex F (informative) Notes on diamond indenters.14
Bibliography.15
©  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
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SIST EN ISO 6508-1:2000
© ISO
ISO 6508-1:1999(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 6508-1 was prepared by the Technical Committee ISO/TC 164, Mechanical testing of metals,
Subcommittee SC 3, Hardness testing.
This first edition of ISO 6508-1 cancels and replaces ISO 6508:1986 and ISO 1024:1989, of which it constitutes a
technical revision as follows:
 Combination of the two different International Standards for the different scales (ISO 6508:1986 and
ISO 1024:1989) into this part of ISO 6508.
 Addition of clause 8 concerning the accuracy of the test results.
 Addition of annex A concerning the conventional HR30Tm test for thin products.
 Addition of annex E concerning a procedure for a periodic check of the testing machines by users.
 Addition of annex F concerning notes on diamond indenters.
 Addition of a 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)
Annexes A, B, C and D form a normative part of this part of ISO 6508. Annexes E and F are for information only.
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SIST EN ISO 6508-1:2000
© ISO
ISO 6508-1:1999(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 6508-1:2000
INTERNATIONAL STANDARD  © ISO ISO 6508-1:1999(E)
Metallic materials — Rockwell hardness test —
Part 1:
Test method (scales A, B, C, D, E, F, G, H, K, N, T)
1 Scope
This part of ISO 6508 specifies the method for Rockwell and Rockwell superficial hardness tests (scales and field of
application in accordance with Table 1) for metallic materials.
For specific materials and/or products, other specific International Standards apply (for instance ISO 3738-1 and
ISO 4498-1).
NOTE For certain materials, the fields of application may be narrower than those indicated.
2 Normative reference
The following normative document contains 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 edition 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 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).
3 Principle
Forcing an indenter (diamond cone, steel or hardmetal ball) into the surface of a test piece in two steps under
specified conditions (see clause 7). Measuring the permanent depth h of indentation under preliminary test force
after removal of additional test force.
From the value of h and the two constant numbers N and S (see Table 2), the Rockwell hardness is calculated
following the formula:
h
Rockwell hardness=-N
S
4 Symbols and designations
See Tables 1 and 2 and Figure 1.
1

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SIST EN ISO 6508-1:2000
© ISO
ISO 6508-1:1999(E)
Table 1 — Rockwell scales
Rockwell Hardness Type of indenter Preliminary Additional Total test Field of application
a
hardness symbol test force test force force (Rockwell hardness test)
scale F F F
0 1
mm N N N
A HRA Diamond cone 98,07 490,3 588,4 20 HRA to 88 HRA
B HRB Ball 1,587 5 mm 98,07 882,6 980,7 20 HRB to 100 HRB
C HRC Diamond cone 98,07 1 373 1 471 20 HRC to 70 HRC
D HRD Diamond cone 98,07 882,6 980,7 40 HRD to 77 HRD
E HRE Ball 3,175 mm 98,07 882,6 980,7 70 HRE to 100 HRE
F HRF Ball 1,587 5 mm 98,07 490,3 588,4 60 HRF to 100 HRF
G HRG Ball 1,587 5 mm 98,07 1 373 1 471 30 HRG to 94 HRG
H HRH Ball 3,175 mm 98,07 490,3 588,4 80 HRH to 100 HRH
K HRK Ball 3,175 mm 98,07 1 373 1 471 40 HRK to 100 HRK
15N HR15N Diamond cone 29,42 117,7 147,1 70 HR15N to 94 HR15N
30N HR30N Diamond cone 29,42 264,8 294,2 42 HR30N to 86 HR30N
45N HR45N Diamond cone 29,42 411,9 441,3 20 HR45N to 77 HR45N
15T HR15T Ball 1,587 5 mm 29,42 117,7 147,1 67 HR15T to 93 HR15T
30T HR30T Ball 1,587 5 mm 29,42 264,8 294,2 29 HR30T to 82 HR30T
45T HR45T Ball 1,587 5 mm 29,42 411,9 441,3 10 HR45T to 72 HR45T
a
For the scales using the ball indenters, the hardness symbol is to be completed with "S", if the steel ball indenter is used
and with "W", if the hardmetal ball is used.
Table 2 — Symbols and designations
Symbol Designation Unit
F Preliminary test force N
0
F Additional test force N
1
F Total test force N
S Scale unit, specific to the scale mm
N Number, specific to the scale
Permanent depth of indentation under preliminary test force after removal of
mm
h
additional test force (permanent indentation depth)
HRA
h
Rockwell hardness=-100
HRC
0,002
HRD
HRB
HRE
HRF h
Rockwell hardness=-130
0,002
HRG
HRH
HRK
HRN
h
Rockwell hardness=-100
HRT
0,001
2

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SIST EN ISO 6508-1:2000
© ISO
ISO 6508-1:1999(E)
4.1  The Rockwell hardness for the scales A, C and D is denoted by the symbol HR preceded by the hardness
value and completed by a letter indicating the scale.
EXAMPLE  59 HRC = Rockwell hardness of 59, measured on the C scale.
4.2  The Rockwell hardness for the scales B, E, F, G, H and K is denoted by the symbol HR preceded by the
hardness value and completed by a letter indicating the scale and a letter for the applied type of ball indenter (S for
steel and W for hardmetal).
EXAMPLE  60 HRBW = Rockwell hardness of 60, measured on the B scale with a hardmetal ball indenter.
4.3  The Rockwell superficial hardness for the N scale is denoted by the symbol HR preceded by the hardness
value and followed by a number (representing the total test force) and the letter N indicating the scale.
EXAMPLE  70 HR30N = Rockwell superficial hardness of 70 measured on the 30 N scale with a total test force of 294,2 N.
4.4  The Rockwell superficial hardness for the T scale is denoted by the symbol HR preceded by the hardness
value and followed by a number (representing the total test force) and the letter T indicating the scale and followed
by a letter for the applied type of the ball indenter (S for steel and W for hardmetal).
EXAMPLE  40 HR30TS = Rockwell superficial hardness of 40 measured on the 30 T scale with a total test force of 294,2 N
and with a steel ball indenter.
Key
1 Indentation depth by preliminary force F 5 Surface of specimen
0
2 Indentation depth by additional test force F 6 Reference plane for measurement
1
3 Elastic recovery just after removal of additional test force F 7 Position of indenter
1
4 Permanent indentation depth
h
Figure 1 — Rockwell principle diagram
5 Testing machine
5.1  Testing machine, capable of applying predetermined forces as shown in Table 1 and in accordance with
ISO 6508-2.
5.2  Conical diamond indenter, in accordance with ISO 6508-2 with an angle of 120° and radius of curvature at
the tip of 0,2 mm.
3

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SIST EN ISO 6508-1:2000
© ISO
ISO 6508-1:1999(E)
5.3  Steel or hardmetal ball indenter, in accordance with ISO 6508-2, with a diameter of 1,587 5 mm or
3,175 mm.
5.4  Measuring device, in accordance with ISO 6508-2.
6 Test piece
6.1  The test shall be carried out on a surface which is smooth and even, free from oxide scale, foreign matter and,
in particular, completely free from lubricants, unless specified otherwise in product or materials standards.
6.2  Preparation shall be carried out in such a way that any alteration of the surface hardness due to heat or cold-
working for example, is minimized. This shall be taken into account particularly in the case of low-depth
indentations.
6.3  After the test, no deformation shall be visible on the surface of the test piece opposite
...