ISO/FDIS 642

Steel — Hardenability test by end quenching (Jominy test)

Acier — Essai de trempabilité par trempe en bout (essai Jominy)

La présente Norme internationale 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.NOTE Par accord et pour un domaine donné d'application, l'essai décrit dans la présente Norme internationale peut être remplacé par le calcul de la courbe Jominy conformément à un modèle mathématique accepté (voir annexe C). En cas de litige, l'essai doit être effectué.

General Information

• Status: Not Published
• ICS: 77.040.99 - Other methods of testing of metals
• Technical Committee: ISO/TC 17/SC 7 - Methods of testing (other than mechanical tests and chemical analysis)
• Drafting Committee: ISO/TC 17/SC 7 - Methods of testing (other than mechanical tests and chemical analysis)
• Current Stage: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Start Date: 04-Jun-2024
• Completion Date: 04-Jun-2024

Relations

• Revises: ISO 642:1999 - Steel — Hardenability test by end quenching (Jominy test)
• Effective Date: 22-Oct-2022

Standards Content (Sample)

FINAL DRAFT
International
Standard
ISO/TC 17/SC 7
Steel — Hardenability test by end
Secretariat: AFNOR
quenching (Jominy test)
Voting begins on:
Acier — Essai de trempabilité par trempe en bout (essai Jominy) 2024-06-04
Voting terminates on:
2024-07-30
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/CEN PARALLEL PROCESSING LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
FINAL DRAFT
International
Standard
ISO/TC 17/SC 7
Steel — Hardenability test by end
Secretariat: AFNOR
quenching (Jominy test)
Voting begins on:
Acier — Essai de trempabilité par trempe en bout (essai Jominy)
2024-06-04
Voting terminates on:
2024-07-30
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2024
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/CEN PARALLEL PROCESSING
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ii
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 .6
9 Preparation for, and measurement of, hardness after quenching . 7
10 Expression of results . 8
10.1 Hardness at any one point .8
10.2 Drawing of the hardness curves .8
10.3 Description of the hardenability characteristics of a particular steel .9
10.4 Codification of test result . .9
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
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 7, Methods of
testing (other than mechanical tests and chemical analysis), in collaboration with the European Committee
for Standardization (CEN) Technical Committee CEN/TC 459, ECISS, European Committee for Iron and Steel
Standardization, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna
Agreement).
This third edition cancels and replaces the second edition (ISO 642:1999), which has been technically
revised.
The main changes are as follows:
— updated the normative references;
— added a new symbol, Jd, in Table 1;
— minimum recommended reduction ratio of 5:1, see 6.1;
— revised the test piece dimensions, see 6.1, 6.2 and Figures 1 and 2;
— revised the heat treatment requirements, see 6.3;
— revised configuration of fixing and centring device, see 7.3 and Figure 3;
— revised text concerning water temperature, see 7.4;
— revised requirement for nitric acid solution concentration, see 9.2;
— revised codification of test result, see 10.4 and Figure 6;
— revised A.2 and Figures A.2 and A.3;
— revised Annex C and Bibliography;
— editorial clarifications;
iv
— reduced the number of bibliographical references.
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
FINAL DRAFT International Standard ISO/FDIS 642:2024(en)
Steel — Hardenability test by end quenching (Jominy test)
1 Scope
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.
2 Normative references
There are no normative references in this document.
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 start
t 5 s
m
of quenching
Temperature of points on the surface, situated at certain distances from
T −
the quenched end
T Temperature of austenitizing −
A
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
d Distance from end of water supply pipe to lower end of test piece (12,5 ± 0,5) mm
w
e Depth of flats for measurement of hardness (0,4 to 0,5) mm
Distance, in millimetres, from quenched end to points where hardness is
d −
measured
TTabablele 1 1 ((ccoonnttiinnueuedd))
Symbol Designation Value
Jd Measured hardness at distance d, in HRC or HV −
Jxx-d Jominy hardenability index at distance d, in Rockwell HRC-mm −
JHVxx-d Jominy hardenability index at distance d, in Vickers HV 30-mm −
5 Principle
The test consists of:
a) heating a cylindrical test piece to a specified temperature in the austenitic range for a specified period
of time;
b) quenching it by spraying water on one of its ends under specified conditions;
c) measuring the hardness at certain given points (see 9.4), on flats made along the axis of the test piece, in
order to determine the hardenability of the steel by variations of this hardness.
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 in accordance with an accepted mathematical model (see Annex C). In
case of dispute, the test shall be carried out.
6 Form of test pieces and their preparation
6.1 Sampling
In the absence of specific requirements in the product standard, and unless otherwise agreed on the order
and regardless of the thickness (or diameter) of the product, the sampling of test piece from the product can
be made:
— either by hot rolling or forging of test piece with 30 mm to
...

Style Definition
Formatted: Font: Bold, French (Switzerland)
ISO/TC 17/SC 7
Formatted: Right: 1.5 cm, Bottom: 1 cm, Gutter: 0 cm,
Header distance from edge: 1.27 cm, Footer distance
Secretariat: AFNOR
from edge: 1.27 cm
Date: 2024-0405-17 Formatted: French (Switzerland)
Formatted: zzCover large
Formatted: Cover Title_A1
Steel — Hardenability test by end quenching (Jominy test)
Acier - — Essai de trempabilité par trempe en bout (Essaiessai Jominy)
Formatted
...
FDIS stage
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Formatted: HeaderCentered
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All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
Formatted: Default Paragraph Font
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
Formatted: Default Paragraph Font
at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Formatted: French (Switzerland)
EmailE-mail: [e-mail]
Formatted: French (Switzerland)
Website: www.iso.orgwww.iso.org
Formatted: French (Switzerland)
Published in Switzerland
Formatted: FooterPageRomanNumber, Line spacing:
single
ii © ISO 2024 – All rights reserved
ii
Formatted: HeaderCentered, Left
Formatted: Font: 11 pt, Bold
Formatted: Font: Bold
Contents
Foreword . v
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 . 4
6.3 Heat treatment . 7
6.4 Machining . 7
7 Apparatus . 7
8 Heating and quenching of test piece . 10
8.1 Heating . 10
8.2 Quenching . 11
9 Preparation for, and measurement of, hardness after quenching . 11
10 Expression of results . 14
10.1 Hardness at any one point . 14
10.2 Drawing of the hardness curves . 14
10.3 Description of the hardenability characteristics of a particular steel . 16
10.4 Codification of test result . 16
11 Test report . 16
Annex A (informative) Specification for the hardenability of a product . 18
Annex B (informative) Additional information to Clause 11 . 25
Annex C (informative) Computational methods for determination of hardenability . 30
Bibliography . 31

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
Formatted: FooterPageRomanNumber
iii
Formatted: Font: 11 pt, Bold
Formatted: HeaderCentered
Formatted: Font: Bold
6.4 Machining . 4
7 Apparatus . 4
8 Heating and quenching of test piece . 6
8.1 Heating . 6
8.2 Quenching . 6
9 Preparation for, and measurement of, hardness after quenching . 7
10 Expression of results . 8
10.1 Hardness at any one point . 8
10.2 Drawing of the hardness curves . 8
10.3 Description of the hardenability characteristics of a particular steel . 9
10.4 Codification of test result . 9
11 Test report . 10
Annex A (informative) Specification for the hardenability of a product . 11
Annex B (informative) Additional information to Clause 11 . 14
Annex C (informative) Computational methods for determination of hardenability . 17
Bibliography . 18
Formatted: FooterPageRomanNumber, Line spacing:
single
iv © ISO 2024 – All rights reserved
iv
Formatted: Font: 11 pt, Bold
Formatted: HeaderCentered, Left
Formatted: Font: Bold
Foreword
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
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 document 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).
Formatted: English (United Kingdom)
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents.www.iso.org/patents. ISO shall not be held responsible for identifying any or all such
patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.htmlwww.iso.org/iso/foreword.html.
Formatted: English (United Kingdom)
This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 7, Methods of testing
(other than mechanical tests and chemical analysis), in collaboration with the European Committee for
Formatted: Font: Not Italic
Standardization (CEN) Technical Committee CEN/TC 459, ECISS -, European Committee for Iron and Steel
Formatted: Font: Not Italic
Standardization, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna
Formatted: Font: Not Italic
Agreement).
Formatted: Adjust space between Latin and Asian text,
This third edition cancels and replaces the second edition (ISO 642:1999), which has been technically revised.
Adjust space between Asian text and numbers
Formatted: Default Paragraph Font
The main changes are as follows:
Formatted: Default Paragraph Font
— — updated the normative references updated;
Formatted: Default Paragraph Font
— — added a new symbol, Jd, in Table 1;Table 1; Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers, Tab
— — minimum recommended reduction ratio of 5:1, see 6.1;6.1; stops: Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm +
3.5 cm + 4.2 cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
— — revision ofrevised the test piece dimensions, see 6.1, 6.26.1, 6.2 and Figures 1Figures 1 and 2;2;
Formatted: Default Paragraph Font
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— — revision of revised the heat treatment requirements, see 6.3;6.3;
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— — revised configuration of fixing and centring device, see 7.37.3 and Figure 3;Figure 3;
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v
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— — revised text concerning water temperature, see 7.4;7.4;
— — revised requirement for nitric acid solution concentration, see 9.2;9.2;
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— — revised codification of test result, see 10.410.4 and Figure 6;Figure 6;
— revised A.2 and Figures A.2 and A.3;
— — revised A.2 and Figures A.2 and A.3;
— revised Annex CAnnex C and Bibliography;
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