EN ISO 6508-3:2005
(Main)Metallic materials - Rockwell hardness test - Part 3: Calibration of reference blocks (scales A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-3:2005)
Metallic materials - Rockwell hardness test - Part 3: Calibration of reference blocks (scales A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-3:2005)
ISO 6508-3:2005 specifies a method for the calibration of reference blocks to be used for the indirect verification of Rockwell hardness testing machines (scales A, B, C, D, E, F, G, H, K, N, T), as specified in ISO 6508-2.
Metallische Werkstoffe - Härteprüfung nach Rockwell - Teil 3: Kalibrierung von Härtevergleichsplatten (Skalen A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-3:2005)
In diesem Teil von ISO 6508 ist das Verfahren für die Kalibrierung von Härtevergleichsplatten festgelegt, die bei der indirekten Prüfung von Härteprüfmaschinen nach Rockwell (Skalen A, B, C, D, E, F, G, H, K, N, T) nach ISO 6508 2 benutzt werden.
Matériaux métalliques - Essai de dureté Rockell - Partie 3: Etalonnage des blocs de référence (échelles A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-3:2005)
L'ISO 6508-3:2005 spécifie une méthode pour l'étalonnage des blocs de référence à utiliser pour la vérification indirecte des machines d'essai de dureté Rockwell (échelles A, B, C, D, E, F, G, H, K, N, T) comme spécifié dans l'ISO 6508-2.
Kovinski materiali – Preskus trdote po Rockwellu – 3. del: Umerjanje primerjalnih ploščic (skale A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-3:2005)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
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Metallic materials - Rockwell hardness test - Part 3: Calibration of reference blocks
(scales A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-3:2005)
Metallische Werkstoffe - Härteprüfung nach Rockwell - Teil 3: Kalibrierung von
Härtevergleichsplatten (Skalen A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-3:2005)
Matériaux métalliques - Essai de dureté Rockell - Partie 3: Etalonnage des blocs de
référence (échelles A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-3:2005)
Ta slovenski standard je istoveten z: EN ISO 6508-3:2005
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.
EUROPEAN STANDARD
EN ISO 6508-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2005
ICS 77.040.10 Supersedes EN ISO 6508-3:1999
English Version
Metallic materials - Rockwell hardness test - Part 3: Calibration
of reference blocks (scales A, B, C, D, E, F, G, H, K, N, T) (ISO
6508-3:2005)
Matériaux métalliques - Essai de dureté Rockell - Partie 3: Metallische Werkstoffe - Härteprüfung nach Rockwell - Teil
Etalonnage des blocs de référence (échelles A, B, C, D, E, 3: Kalibrierung von Härtevergleichsplatten (Skalen A, B, C,
F, G, H, K, N, T) (ISO 6508-3:2005) D, E, F, G, H, K, N, T) (ISO 6508-3:2005)
This European Standard was approved by CEN on 14 December 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6508-3:2005: E
worldwide for CEN national Members.
Foreword
This document (EN ISO 6508-3:2005) has been prepared by Technical Committee ISO/TC 164
"Mechanical testing of metals" in collaboration with Technical Committee ECISS/TC 1 "Steel -
Mechanical testing", 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 June 2006, and conflicting national
standards shall be withdrawn at the latest by June 2006.
This document supersedes EN ISO 6508-3:1999.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Endorsement notice
The text of ISO 6508-3:2005 has been approved by CEN as EN ISO 6508-3:2005 without any
modifications.
INTERNATIONAL ISO
STANDARD 6508-3
Second edition
2005-12-15
Metallic materials — Rockwell hardness
test —
Part 3:
Calibration of reference blocks (scales A,
B, C, D, E, F, G, H, K, N, T)
Matériaux métalliques — Essai de dureté Rockwell —
Partie 3: Étalonnage des blocs de référence (échelles A, B, C, D, E, F,
G, H, K, N, T)
Reference number
ISO 6508-3:2005(E)
©
ISO 2005
ISO 6508-3:2005(E)
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ii © ISO 2005 – All rights reserved
ISO 6508-3:2005(E)
Contents Page
Foreword. iv
Introduction . v
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. 4
7 Uniformity of hardness. 4
8 Marking . 5
9 Validity . 6
Annex A (normative) Uniformity of reference blocks. 7
Annex B (informative) Uncertainty of the mean hardness value of hardness-reference blocks . 9
Bibliography . 12
ISO 6508-3:2005(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 2.
The main task of technical committees is to prepare International Standards. 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.
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.
ISO 6508-3 was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals, Subcommittee
SC 3, Hardness testing.
This second edition cancels and replaces the first edition (ISO 6508-3:1999), which has been technically
revised.
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)
iv © ISO 2005 – All rights reserved
ISO 6508-3:2005(E)
Introduction
Attention is drawn to the fact that in this part of ISO 6508, the use of hardmetal for ball indenters is considered
to be the standard type of Rockwell indenter ball. Steel indenter balls may be continued to be used if specified
in a product specification, or by special agreement.
INTERNATIONAL STANDARD ISO 6508-3:2005(E)
Metallic materials — Rockwell hardness test —
Part 3:
Calibration of reference blocks (scales A, B, C, D, E, F, G, H, K,
N, T)
1 Scope
This part of ISO 6508 specifies a method for the calibration of reference blocks to be used for the indirect
verification of Rockwell hardness testing machines (scales A, B, C, D, E, F, G, H, K, N, T), as specified in
ISO 6508-2.
2 Normative references
The following referenced documents are indispensable for the application 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 376:2004, Metallic materials — Calibration of force-proving instruments used for verification of uniaxial
testing machines
ISO 4287:1997, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Terms,
definitions and surface texture parameters
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 6508-2, 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 Manufacture of reference blocks
3.1 The block shall be specially manufactured for use as a hardness-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 6 mm.
Reference blocks should have a thickness of 6 mm to 16 mm. To minimize the effect of hardness change with
increasing number of indents, a minimum thickness of 12 mm should be used for steel. For other materials,
different thicknesses could be used.
3.3 The reference blocks shall be free of magnetism. It is recommended that the manufacturer ensure that
the blocks, if made of steel, have been demagnetized at the end of the manufacturing process (before
calibration).
ISO 6508-3:2005(E)
3.4 The tolerance in flatness of the surfaces shall not exceed 0,01 mm. The bottom of the blocks shall not
be convex.
The tolerance parallelism shall not exceed 0,02 mm on 50 mm.
3.5 The test and lower surfaces shall be free from damage, such as notches, scratches, oxide layers, etc.,
which interfere with the measurement of the indentations. The surface roughness Ra shall not exceed
0,000 3 mm for the test surface and 0,000 8 mm for the bottom surface: sampling length l = 0,8 mm (see
ISO 4287:1997, 3.1.9).
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 e)].
4 Calibration machine
4.1 In addition to fulfilling the general conditions specified in Clause 3 of ISO 6508-2:2005, the calibration
machine shall also meet the requirements given in 4.2 to 4.8.
4.2 The machine shall be verified directly in intervals not exceeding 12 months. Direct verification involves:
a) calibration of the test force;
b) verification of the indenter; the verification period can be extended for up to 5 years, if the indenter is
verified for performance against at least one other reference indenter at intervals not exceeding
12 months;
c) calibration of the measuring system;
d) verification of the testing cycle; if this is not possible, at least the force versus time behaviour.
4.3 The instruments used for the verification and calibration of the calibration machine shall be traceable to
national standards.
4.4 “Each test force shall be measured using an elastic proving device (of ISO 376:2004 Class 0,5 or
better), or by another method having the same or better accuracy. This measurement shall agree with the
nominal preliminary test force F , to within ± 0,2 % and t
...
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