EN ISO 12004-1:2020

SLOVENSKI STANDARD
01-marec-2021
Nadomešča:
SIST EN ISO 12004-1:2009
Kovinski materialii - Določevanje krivulj preoblikovalnosti za pločevino in trakove -
1. del: Merjenje in uporaba diagramov preoblikovalnosti na stiskalnicah (ISO 12004
-1:2020)
Metallic materials - Determination of forming-limit curves for sheet and strip - Part 1:
Measurement and application of forming-limit diagrams in the press shop (ISO 12004-
1:2020)
Metallische Werkstoffe - Bestimmung der Grenzformänderungskurven für Bleche und
Bänder - Teil 1: Messung und Anwendung von Grenzformänderungsdiagrammen in
Stanzereien (ISO 12004-1:2020)
Matériaux métalliques - Détermination des courbes limites de formage pour les tôles et
bandes - Partie 1: Mesurage et application des diagrammes limites de formage dans les
ateliers d'emboutissage (ISO 12004-1:2020)
Ta slovenski standard je istoveten z: EN ISO 12004-1:2020
ICS:
77.040.10 Mehansko preskušanje kovin Mechanical testing of metals
77.140.50 Ploščati jekleni izdelki in Flat steel products and semi-
polizdelki products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 12004-1
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2020
EUROPÄISCHE NORM
ICS 77.040.10 Supersedes EN ISO 12004-1:2008
English Version
Metallic materials - Determination of forming-limit curves
for sheet and strip - Part 1: Measurement and application
of forming-limit diagrams in the press shop (ISO 12004-
1:2020)
Matériaux métalliques - Détermination des courbes Metallische Werkstoffe - Bestimmung der
limites de formage pour les tôles et bandes - Partie 1: Grenzformänderungskurven für Bleche und Bänder -
Mesurage et application des diagrammes limites de Teil 1: Messung und Anwendung von
formage dans les ateliers d'emboutissage (ISO 12004- Grenzformänderungsdiagrammen in Stanzereien (ISO
1:2020) 12004-1:2020)
This European Standard was approved by CEN on 15 October 2020.

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, Turkey 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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12004-1:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 12004-1:2020) has been prepared by Technical Committee ISO/TC 164
"Mechanical testing of metals" in collaboration with Technical Committee CEN/TC 459/SC 1 “Test
methods for steel (other than chemical analysis)” 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 May 2021, and conflicting national standards shall be
withdrawn at the latest by May 2021.
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 12004-1:2008.
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, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 12004-1:2020 has been approved by CEN as EN ISO 12004-1:2020 without any
modification.
INTERNATIONAL ISO
STANDARD 12004-1
Second edition
2020-10
Metallic materials — Determination
of forming-limit curves for sheet and
strip —
Part 1:
Measurement and application of
forming-limit diagrams in the press
shop
Matériaux métalliques — Détermination des courbes limites de
formage pour les tôles et bandes —
Partie 1: Mesurage et application des diagrammes limites de formage
dans les ateliers d'emboutissage
Reference number
ISO 12004-1:2020(E)
©
ISO 2020
ISO 12004-1:2020(E)
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 12004-1:2020(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 1
5 Principle . 1
6 Test conditions . 2
7 Procedure. 3
8 Interpretation of results . 3
9 Test report . 4
Annex A (informative) Modification to forming-limit curves . 5
Annex B (informative) Examples of grid patterns currently in use . 6
Bibliography . 8
ISO 12004-1:2020(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 164, Mechanical testing of metals,
Subcommittee SC 2, Ductility testing, in collaboration with the European Committee for Standardization
(CEN) Technical Committee CEN/TC 459/SC 1, Test methods for steel (other than chemical analysis), in
accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 12004-1:2008), which has been
technically revised.
The main changes compared to the previous edition are as follows:
1) The title was changed to have three elements.
2) Clauses 2 and 3 were added from the previous edition, and the subsequent sections were
renumbered.
3) The description of when to use this document (ISO 12004-1) or ISO 12004-2 was revised in the
Introduction.
4) Throughout the document the use of engineering strain was clarified.
5) Subclause 6.2 was extended to include what was the subsequent Clause in the previous version.
6) The former note was moved to part of Clause 7, since it gives permission to use another method.
7) The text in Annex A and the figure captions in Annex B were clarified.
A list of all parts in the ISO 12004 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 © ISO 2020 – All rights reserved

ISO 12004-1:2020(E)
Introduction
A forming-limit diagram (FLD) is a diagram containing measured major/minor strain points on a
formed part.
An FLD can distinguish between safe and necked, or failed, points. The transition from safe to failed
points is defined by the forming-limit curve (FLC).
To determine the forming limit of materials, two different methods are possible.
1) Strain analysis of failed press shop components to determine component and process dependent FLCs
In the press shop, strain paths to reach these points are generally not known. Such an FLC depends
on the material, the component, and the chosen forming conditions. This method is described in
this document and is not intended to determine one unique FLC for each material.
2) Determination of FLCs under well-defined laboratory conditions
For evaluating formability, one unique FLC for each material in several strain states can be
measured. The determination of FLC must be specific and uses multiple linear strain paths. The
ISO 12004-2 is intended for this type of material characterization.
INTERNATIONAL STANDARD ISO 12004-1:2020(E)
Metallic materials — Determination of forming-limit
curves for sheet an
...