FprEN ISO 642
(Main)Steel - Hardenability test by end quenching (Jominy test) (ISO/FDIS 642:2024)
Steel - Hardenability test by end quenching (Jominy test) (ISO/FDIS 642:2024)
This document specifies a method for determining the hardenability of steel by end quenching (Jominy test) by using a test piece 25 mm in diameter and at least 100 mm long.
By agreement and for a defined field of application, the test described in this document can be replaced by the calculation of the Jominy curve according to an accepted mathematical model.
Stahl - Stirnabschreckversuch (Jominy-Versuch) (ISO/FDIS 642:2024)
Dieses Dokument legt ein Verfahren zur Ermittlung der Härtbarkeit von Stahl durch den Stirnabschreckversuch (Jominy-Versuch) an einer Probe mit 25 mm Durchmesser und 100 mm Länge fest.
Die in diesem Dokument beschriebene Prüfung darf nach Vereinbarung und für einen bestimmten Anwendungsbereich durch die Berechnung der Jominy-Kurve nach einem anerkannten mathematischen Verfahren ersetzt werden.
Acier - Essai de trempabilité par trempe en bout (essai Jominy) (ISO/FDIS 642:2024)
Le présent document spécifie la méthode de détermination de la trempabilité de l'acier par trempe en bout (essai Jominy), à l'aide d'une éprouvette de 25 mm de diamètre et 100 mm de longueur minimum.
Par accord et pour un domaine d'application donné, l'essai décrit dans le présent document peut être remplacé par le calcul de la courbe Jominy selon un modèle mathématique validé.
Jeklo - Preskus kaljivosti jekla po Jominyju (ISO/FDIS 642:2024)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN ISO 642:2023
01-september-2023
Jeklo - Preskus kaljivosti jekla po Jominyju (ISO/DIS 642:2023)
Steel - Hardenability test by end quenching (Jominy test) (ISO/DIS 642:2023)
Stahl - Stirnabschreckversuch (Jominy-Versuch) (ISO/DIS 642:2023)
Acier - Essai de trempabilité par trempe en bout (essai Jominy) (ISO/DIS 642:2023)
Ta slovenski standard je istoveten z: prEN ISO 642
ICS:
77.040.99 Druge metode za Other methods of testing of
preskušanje kovin metals
77.080.20 Jekla Steels
oSIST prEN ISO 642:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
oSIST prEN ISO 642:2023
oSIST prEN ISO 642:2023
DRAFT INTERNATIONAL STANDARD
ISO/DIS 642
ISO/TC 17/SC 7 Secretariat: AFNOR
Voting begins on: Voting terminates on:
2023-07-19 2023-10-11
Steel — Hardenability test by end quenching (Jominy test)
Acier — Essai de trempabilité par trempe en bout (essai Jominy)
ICS: 77.040.99
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
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Reference number
NATIONAL REGULATIONS.
ISO/DIS 642:2023(E)
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TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2023
oSIST prEN ISO 642:2023
ISO/DIS 642:2023(E)
DRAFT INTERNATIONAL STANDARD
ISO/DIS 642
ISO/TC 17/SC 7 Secretariat: AFNOR
Voting begins on: Voting terminates on:
Steel — Hardenability test by end quenching (Jominy test)
Acier — Essai de trempabilité par trempe en bout (essai Jominy)
ICS: 77.040.99
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
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
NOT BE REFERRED TO AS AN INTERNATIONAL
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NATIONAL REGULATIONS.
Website: www.iso.org ISO/DIS 642:2023(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
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ii
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2023
oSIST prEN ISO 642:2023
ISO/DIS 642:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and designations . 1
5 Principle . 2
6 Form of test pieces and their preparation . 2
6.1 Sampling . 2
6.2 Dimensions . 3
6.3 Heat treatment. 4
6.4 Machining . 4
7 Apparatus . 4
8 Heating and quenching of test piece . 6
8.1 Heating. 6
8.2 Quenching . 7
9 Preparation for, and measurement of, hardness after quenching .7
10 Expression of results . 9
10.1 Hardness at any one point . 9
10.2 Drawing of the hardness curves . 9
10.3 Description of the hardenability characteristics of a particular steel . 9
10.4 Codification of test result . . 10
11 Test report .10
Annex A (informative) Specification for the hardenability of a product .11
Annex B (informative) Additional information to Clause 11 .15
Annex C (informative) Computational methods for determination of hardenability .18
Bibliography .19
iii
oSIST prEN ISO 642:2023
ISO/DIS 642:2023(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
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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).
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expressions related to conformity assessment, as well as information about ISO's adherence to
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www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee [or Project Committee] ISO/TC 17, Steel,
Subcommittee SC 7, Methods of testing (other than mechanical tests and chemical analysis).
This third edition cancels and replaces the second edition (ISO 642:1999), which has been technically
revised.
Annexes A, B, and C of this International Standard are for information only.
The main changes are as follows:
— normative references updated;
— new symbol Jd in Table 1;
— minimum recommended reduction ratio of 5:1, see Clause 6.1;
— revision of the test piece dimensions, see Clauses 6.1, 6.2 and Figures 1 and 2;
— revision of the heat treatment requirements, see Clause 6.3;
— revised configuration of fixing and centring device, see Clause 7.3 and Figure 3;
— revised text concerning water temperature, see Clause 7.4;
— revised requirement for nitric acid solution concentration, see Clause 9.2;
— revised codification of test result, see Clause 10.4 and Figure 6;
— revised Clause A.2 and Figures A.2 and A.3;
— revised Annex C and Bibliography;
— editorial clarifications;
iv
oSIST prEN ISO 642:2023
ISO/DIS 642:2023(E)
number of bibliographical references reduced.Any feedback or questions on this document should
be directed to the user’s national standards body. A complete listing of these bodies can be found at
www.iso.org/members.html.
v
oSIST prEN ISO 642:2023
oSIST prEN ISO 642:2023
DRAFT INTERNATIONAL STANDARD ISO/DIS 642:2023(E)
Steel — Hardenability test by end quenching (Jominy test)
1 Scope
This International Standard specifies a method for determining the hardenability of steel by end
quenching (Jominy test) by using a test piece 25 mm in diameter and at least 100 mm long.
By agreement and for a defined field of application, the test described in this International Standard
may be replaced by the calculation of the Jominy curve in accordance with an accepted mathematical
model (see annex C). In case of dispute, the test shall be carried out.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method
ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Symbols and designations
Symbols and designations used in this document are shown in Table 1.
Table 1 — Symbols and designations
Symbol Designation Value
L Test length of test piece (97 ± 0,5) mm
+05,
D Diameter of test piece 25 mm
()
+5
t Time during which test piece is maintained at heating temperature 30 min
()
Maximum time lag between removal of test piece from furnace and
t 5 s
m
start of quenching
T Temperature of cooling water (20 ± 5) °C
a Internal diameter of vertical water supply pipe (12,5 ± 0,5) mm
h Height of water jet without test piece in position (65 ± 10) mm
l Distance from end of water supply pipe to lower end of test piece (12,5 ± 0,5) mm
e Depth of flats for measurement of hardness (0,4 to 0,5) mm
Distance, in millimetres, from quenched end to points where hard-
d −
ness is measured
oSIST prEN ISO 642:2023
ISO/DIS 642:2023(E)
TTabablele 1 1 ((ccoonnttiinnueuedd))
Symbol Des
...
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