oSIST prEN ISO 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)

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.

Jeklo - Preskus kaljivosti jekla po Jominyju (ISO/DIS 642:2023)

General Information

• Status: Not Published
• Public Enquiry End Date: 29-Sep-2023
• ICS: 77.040.99 - Other methods of testing of metals
• ICS: 77.080.20 - Steels
• Technical Committee: PKG - Testing of metallic materials
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 02-Aug-2023
• Due Date: 20-Dec-2023
• Ref Project: prEN ISO 642 - Steel - Hardenability test by end quenching (Jominy test) (ISO/DIS 642:2023)

Relations

• Revises: SIST EN ISO 642:2002 - Steel - Hardenability test by end quenching (Jominy test) (ISO 642:1999)
• Effective Date: 28-Jan-2023

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.

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oSIST prEN ISO 642:2023

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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
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 642:2023(E)
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 SUPPORTING DOCUMENTATION. © ISO 2023

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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.
COPYRIGHT PROTECTED DOCUMENT
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
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on STANDARD UNTIL PUBLISHED AS SUCH.
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
IN ADDITION TO THEIR EVALUATION AS
or ISO’s member body in the country of the requester. BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
ISO copyright office
USER PURPOSES, DRAFT INTERNATIONAL
CP 401 • Ch. de Blandonnet 8
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
CH-1214 Vernier, Geneva
POTENTIAL TO BECOME STANDARDS TO
Phone: [phone]
WHICH REFERENCE MAY BE MADE IN
Reference number
Email: [e-mail]
NATIONAL REGULATIONS.
Website: www.iso.org ISO/DIS 642:2023(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
Published in Switzerland
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
ii
  © ISO 2023 – All rights reserved
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2023

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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
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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
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 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).
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 [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
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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
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oSIST prEN ISO 642:2023

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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
()
0
+5
t Time during which test piece is maintained at heating temperature 30 min
()
0
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
1
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oSIST prEN ISO 642:2023
ISO/DIS 642:2023(E)
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 longitudinal flats made on the test
piece, in order to determine the hardenability of the steel by variations of this hardness.
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 32 mm diameter;
+05, +5
— or by machining of a test piece with diameter 25 mm whose axis shall be at 20 mm one
() ()
0
0
of the surfaces of the product (see Figure 1).
In case of products from continuous casting, a minimum reduction ratio 5:1 is recommended before
sampling.
In all the forming processes preceding the machining of the test piece, the deformation of the product
from all sides should be as uniform as possible.
In the case of a separately cast reference test piece, the original cross section before deformation must
be at least three times that corresponding to the required diameter of 30 mm to 32 mm.
By special agreement, the test piece can be obtained by a suitable casting process and tested in the as-
cast condition.
The flats of the test piece shall have their axes at approximately the same distance from the product
surface (see Figure 1). For this purpose, the test piece shall be marked so that its position in the round
bar can be clearly recognized.
2
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oSIST prEN ISO 642:2023
ISO/DIS 642:2023(E)
Dimensions in millimetres
Key
1 test flats for measuring the hardness
Figure 1 — Sampling of the test piece for machining
6.2 Dimensions
6.2.1 The test piece shall consist of a round bar machined to a diameter of 25 mm and a length of at
least 100 mm.
6.2.2 The end of the test piece which will not be quenched shall be 30 mm to 32 mm or 25 mm in
diameter, depending upon the form of that end. Two examples, test pieces with a flange or an undercut
(to permit rapid centring and fitting in position for the quenching operation by means of an appropriate
support) are shown in Figure 2.
3
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oSIST prEN ISO 642:2023
ISO/DIS 642:2023(E)
Dimensions in millimetres
Flange thickness can be from 3 mm up to and including 20 mm. In case of dispute, reference sample flange
thickness shall be 3 mm; sample length shall be 100 mm ± 0,5 mm.
Figure 2 — Dimensions of test piece
6.2.3 The test piece shall, if
...