EN ISO 4491-2:2023
(Main)Metallic powders - Determination of oxygen content by reduction methods - Part 2: Loss of mass on hydrogen reduction (hydrogen loss) (ISO 4491-2:2023)
Metallic powders - Determination of oxygen content by reduction methods - Part 2: Loss of mass on hydrogen reduction (hydrogen loss) (ISO 4491-2:2023)
This document specifies a method for the determination of the relative loss of mass which a metallic powder undergoes when heated in a stream of pure dry hydrogen under specified conditions.
The purpose of this test is to evaluate a chemical powder characteristic which is of importance to the powder metallurgical industry. The test is not intended as a means for the determination of the content of specific elements (see Annex A and ISO 4491-1).
The test method is applicable to unalloyed, partially alloyed and completely alloyed powders of the metals listed in Table 1 (see 7.2.1). It is not applicable to lubricated powders or to mixtures of metal powders.
Metallpulver - Bestimmung des Sauerstoffanteils durch Reduktionsverfahren - Teil 2: Masseverlust durch Reduktion mit Wasserstoff (ISO 4491-2:2023)
Dieses Dokument legt ein Verfahren zur Bestimmung des relativen Masseverlustes fest, den ein Metallpulver erfährt, wenn es unter festgelegten Bedingungen in einem Strom von reinem trockenem Wasserstoff erhitzt wird.
Zweck dieser Prüfung ist die Bewertung einer chemischen Pulvereigenschaft, die für die pulvermetallurgische Industrie von Bedeutung ist. Die Prüfung ist nicht als Mittel zur Bestimmung des Gehalts an bestimmten Ele
menten gedacht (siehe AnhangA und ISO4491-1).
Das Prüfverfahren ist anwendbar auf unlegierte, teillegierte und fertiglegierte Pulver der in Tabelle1 aufge
führten Metalle (siehe 7.2.1). Es ist nicht anwendbar auf geschmierte Pulver oder auf Mischungen von Metall
pulvern.
Poudres métalliques - Dosage de l'oxygène par les méthodes de réduction - Partie 2: Perte de masse par réduction dans l'hydrogène (perte dans l'hydrogène) (ISO 4491-2:2023)
Le présent document spécifie une méthode pour la détermination de la perte de masse relative que subit une poudre métallique quand elle est chauffée dans un courant d’hydrogène pur et sec dans des conditions spécifiées.
Cet essai permet d’évaluer une caractéristique chimique des poudres qui est importante dans l’industrie de la métallurgie des poudres. L’essai n’a pas pour objet de déterminer la teneur en certains éléments spécifiques (voir l’Annexe A et l’ISO 4491-1).
La présente méthode d’essai est applicable aux poudres non alliées, partiellement ou complètement alliées, à base des métaux indiqués dans le Tableau 1 (voir 7.2.1). Elle n’est pas applicable aux poudres contenant du lubrifiant ou aux mélanges de poudres métalliques.
Kovinski praški - Ugotavljanje deleža kisika z redukcijskimi metodami - 2. del: Izguba mase pri redukciji vodika (izguba vodika) (ISO 4491-2:2023)
Ta dokument opisuje metodo za določanje sorazmerne izgube mase kovinskega praška pri segrevanju v toku čistega suhega vodika pod določenimi pogoji.
Namen tega preskusa je oceniti lastnosti kemičnih praškov, ki so pomembne za praškovno metalurško industrijo. Preskus ni namenjen kot sredstvo za ugotavljanje deleža določenih elementov (glej dodatek A in standard ISO 4491-1).
Preskusna metoda se uporablja za nelegirane, delno legirane in v celoti legirane praške kovin iz preglednice 1 (glej točko 7.2.1). Ne uporablja se za lubricirane praške ali mešanice kovinskih praškov.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2023
Kovinski praški - Ugotavljanje deleža kisika z redukcijskimi metodami - 2. del:
Izguba mase pri redukciji vodika (izguba vodika) (ISO 4491-2:2023)
Metallic powders - Determination of oxygen content by reduction methods - Part 2: Loss
of mass on hydrogen reduction (hydrogen loss) (ISO 4491-2:2023)
Metallpulver - Bestimmung des Sauerstoffanteils durch Reduktionsverfahren - Teil 2:
Masseverlust durch Reduktion mit Wasserstoff (ISO 4491-2:2023)
Poudres métalliques - Dosage de l'oxygène par les méthodes de réduction - Partie 2:
Perte de masse par réduction dans l'hydrogène (perte dans l'hydrogène) (ISO 4491-
2:2023)
Ta slovenski standard je istoveten z: EN ISO 4491-2:2023
ICS:
77.160 Metalurgija prahov Powder metallurgy
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 4491-2
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2023
EUROPÄISCHE NORM
ICS 77.160 Supersedes EN ISO 4491-2:1999
English Version
Metallic powders - Determination of oxygen content by
reduction methods - Part 2: Loss of mass on hydrogen
reduction (hydrogen loss) (ISO 4491-2:2023)
Poudres métalliques - Dosage de l'oxygène par les Metallpulver - Bestimmung des Sauerstoffanteils durch
méthodes de réduction - Partie 2: Perte de masse par Reduktionsverfahren - Teil 2: Masseverlust durch
réduction dans l'hydrogène (perte dans l'hydrogène) Reduktion mit Wasserstoff (ISO 4491-2:2023)
(ISO 4491-2:2023)
This European Standard was approved by CEN on 16 April 2023.
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 CEN-CENELEC Management Centre 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 CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 4491-2:2023 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 4491-2:2023) has been prepared by Technical Committee ISO/TC 119 "Powder
metallurgy" in collaboration with CCMC.
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 October 2023, and conflicting national standards shall
be withdrawn at the latest by October 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 4491-2:1999.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 4491-2:2023 has been approved by CEN as EN ISO 4491-2:2023 without any
modification.
INTERNATIONAL ISO
STANDARD 4491-2
Third edition
2023-04
Metallic powders — Determination
of oxygen content by reduction
methods —
Part 2:
Loss of mass on hydrogen reduction
(hydrogen loss)
Poudres métalliques — Dosage de l'oxygène par les méthodes de
réduction —
Partie 2: Perte de masse par réduction dans l'hydrogène (perte dans
l'hydrogène)
Reference number
ISO 4491-2:2023(E)
ISO 4491-2:2023(E)
© ISO 2023
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, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
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CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 4491-2:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Reagents and materials . 1
5 Apparatus . 1
5.1 General . 1
5.2 Balance . 1
5.3 Furnace . . 2
5.4 Gas-tight tube . 2
5.5 Thermocouple . 2
5.6 Boat . 2
5.7 Supply unit . . 2
6 Sampling . 3
7 Procedure .3
7.1 General . 3
7.2 Test procedure . 3
8 Calculation and expression of test results . 5
9 Precision . 5
10 Test report . 6
Annex A (informative) Interpretation of results . 7
Bibliography . 8
iii
ISO 4491-2:2023(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 ISO/TC 119 Powder metallurgy, Subcommittee
SC 2, Sampling and testing methods for sintered metal materials (excluding hardmetals), in collaboration
with the European Committee for Standardization (CEN) Technical Committee CEN/SS M11, Powder
metallurgy, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna
Agreement).
This third edition cancels and replaces the second edition (ISO 4491-2:1997), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— adding of precision statement.
A list of all parts in the ISO 4491 series can be found on the ISO website.
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.
iv
INTERNATIONAL STANDARD ISO 4491-2:2023(E)
Metallic powders — Determination of oxygen content by
reduction methods —
Part 2:
Loss of mass on hydrogen reduction (hydrogen loss)
1 Scope
This document specifies a method for the determination of the relative loss of mass which a metallic
powder undergoes when heated in a stream of pure dry hydrogen under specified conditions.
The purpose of this test is to evaluate a chemical powder characteristic which is of importance to the
powder metallurgical industry. The test is not intended as a means for the determination of the content
of specific elements (see Annex A and ISO 4491-1).
The test method is app
...
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