oSIST prEN ISO 20482:2026

• Abstract:

  ISO 20482:2013 specifies a standard test method for determining the ability of metallic sheets and strips having a thickness from 0,1 mm up to 2 mm and a width of 90 mm or greater to undergo plastic deformation in stretch forming.; For materials that are thicker and when only narrower strips are available, tools of specified dimensions are provided, in which case subscripts are used, as shown in Table 1.

• Status: Not Published
• Public Enquiry End Date: 30-Oct-2026
• ICS: 77.040.10 - Mechanical testing of metals
• ICS: 77.140.50 - Flat steel products and semi-products
• Technical Committee: PKG - Testing of metallic materials
• Ref Project: prEN ISO 20482 - Metallic materials - Sheet and strip - Erichsen cupping test (ISO/DIS 20482:2026)

• Revises: SIST EN ISO 20482:2014 - Metallic materials - Sheet and strip - Erichsen cupping test (ISO 20482:2013)
• Effective Date: 17-Jul-2024

oSIST prEN ISO 20482:2026 is a SIST standard for the Erichsen cupping test on metallic sheet and strip. It specifies how to measure resistance to plastic deformation in stretch forming by pressing a spherical punch into a clamped test piece until a through crack appears. The document is used by laboratories, producers and users who need a common way to compare formability.

What does oSIST prEN ISO 20482:2026 specify?

oSIST prEN ISO 20482:2026 specifies a test method for metallic sheets and strips with a thickness from 0.1 mm up to 2 mm and a width of 90 mm or greater. For thicker material and narrower strips, it provides specified tool dimensions and a different designation system for the result.

The document is organized into clauses 1 to 10, covering scope, references, terms, symbols, principle, equipment, test piece, test conditions, procedure and test report. It also has one informative annex.

Annex	What it covers
Annex A	Example composition of the graphite grease used for the test

What are the key requirements of oSIST prEN ISO 20482:2026?

oSIST prEN ISO 20482:2026 requires the test piece to be clamped between a blank holder and a die while a spherical punch forms an indentation until a through crack appears. The measured result is the depth of penetration, reported as the Erichsen cupping index, IE. In practice, this gives a comparable way to judge how far a sheet can stretch before cracking.

Clause 4 and Table 1 set the test geometry

oSIST prEN ISO 20482:2026 uses Figure 1 and Table 1 to define the symbols, specimen sizes and tool dimensions. The table distinguishes the standard test from cases with thicker or narrower specimens, and it links the IE designation to the bore diameter used. In practice, the laboratory must select the correct tool set before testing so the result is comparable.

Clauses 5 and 6 define the apparatus and the end point

oSIST prEN ISO 20482:2026 requires a machine with a die, punch and blank holder built to the stated dimensions and tolerances. The working surfaces must be hard, rigid, aligned and smooth enough for the test, and the punch movement must be measurable in 0.1 mm steps. The end of the test is the moment a through crack appears, although a sudden drop in force may also be used if it is recorded in the report.

Clauses 7 to 9 control the specimen and procedure

oSIST prEN ISO 20482:2026 requires a flat specimen without burrs or distortion, and it must not be pre-worked by hammering or hot or cold working. The test is normally carried out between 10 °C and 35 °C, with controlled testing at 23 °C ± 5 °C when required. The procedure includes measuring thickness to 0.01 mm, greasing the contact surfaces, applying the test at the stated rate, and measuring the indentation depth to 0.1 mm.

Clause 9 sets the number of tests and the result

oSIST prEN ISO 20482:2026 requires at least three tests unless product standards say otherwise. The result is the average of at least three individual h readings, expressed in millimetres and rounded as specified in the document. For users, this means the reported IE value is an average, not a single reading.

Clause 10 defines the report

oSIST prEN ISO 20482:2026 requires the report to identify the standard, the test piece orientation, thickness and lubricant used. Where requested by the parties involved, it also records the appearance after rupture and the individual IE readings used for averaging. This helps buyers, suppliers and laboratories trace exactly how the result was obtained.

What terms does oSIST prEN ISO 20482:2026 define?

• Through crack - a crack that passes through the full thickness of the test piece and is wide enough for light to pass through part of its length.
• Erichsen cupping index (IE) - the result reported from the test, based on the indentation depth at the moment of cracking.
• Blank holder - the part that clamps the specimen against the die during the test.
• Punch - the tool pressed into the specimen to form the indentation.
• Die - the supporting tool that works with the punch and blank holder to shape the specimen.

Who uses oSIST prEN ISO 20482:2026?

oSIST prEN ISO 20482:2026 is used by mechanical testing laboratories, metals producers, quality managers and buyers of sheet and strip products. It is also relevant to product standard writers and people comparing formability for flat steel products and semi-products. In practice, they use it for specification checks, incoming inspection, product development and acceptance testing.

What changed in oSIST prEN ISO 20482:2026 from the previous edition?

oSIST prEN ISO 20482:2026 replaces ISO 20482:2013 and is described as technically revised. The listed changes include a modified definition of “through crack”, a corrected dimension line for h in Figure 1, revised wording in 6.2 and 6.4, added references to ISO 21920-2 and ISO 3290-1, updated grease guidance in clause 9.2 and Annex A, and additional reporting guidance for force-drop stopping and rounding of h readings.

Which standards are used with oSIST prEN ISO 20482:2026?

oSIST prEN ISO 20482:2026 normatively references ISO 21920-2 and ISO 3290-1. ISO 21920-2 supplies the surface-texture terms and the definition of Ra used for the punch finish. ISO 3290-1 supplies the specification for steel balls when they are used instead of the defined punch.

What does the oSIST prEN ISO 20482:2026 document contain?

oSIST prEN ISO 20482:2026 contains a schematic of the Erichsen cupping index, a table of symbols and dimensions, and the full test sequence from specimen preparation to reporting. It also includes equipment requirements, temperature limits, the test rate, and the rule for when to stop the punch movement. Annex A provides an example composition for the graphite grease, and the bibliography points to ISO 3290-1.

SLOVENSKI STANDARD
01-oktober-2026
Kovinski materiali - Pločevina in trakovi - Preskus globokega vleka po Erichsenu
(ISO/DIS 20482:2026)
Metallic materials - Sheet and strip - Erichsen cupping test (ISO/DIS 20482:2026)
Metallische Werkstoffe - Bleche und Bänder - Tiefungsversuch nach Erichsen (ISO/DIS
20482:2026)
Matériaux métalliques - Tôles et bandes - Essai d'emboutissage Erichsen (ISO/DIS
20482:2026)
Ta slovenski standard je istoveten z: prEN ISO 20482
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.

DRAFT
International
Standard
ISO/DIS 20482
ISO/TC 164/SC 2
Metallic materials — Sheet and strip
Secretariat: JISC
— Erichsen cupping test
Voting begins on:
Matériaux métalliques — Tôles et bandes — Essai
2026-08-21
d'emboutissage Erichsen
Voting terminates on:
ICS: 77.040.10 2026-11-13
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document has not been edited by the ISO Central Secretariat.
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STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
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RECIPIENTS OF THIS DRAFT ARE INVITED
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NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 20482:2026(en)
DRAFT
ISO/DIS 20482:2026(en)
International
Standard
ISO/DIS 20482
ISO/TC 164/SC 2
Metallic materials — Sheet and strip
Secretariat: JISC
— Erichsen cupping test
Voting begins on:
Matériaux métalliques — Tôles et bandes — Essai
d'emboutissage Erichsen
Voting terminates on:
ICS: 77.040.10
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document has not been edited by the ISO Central Secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2026
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
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RECIPIENTS OF THIS DRAFT ARE INVITED
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TO SUBMIT, WITH THEIR COMMENTS,
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NOTIFICATION OF ANY RELEVANT PATENT
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Published in Switzerland Reference number
ISO/DIS 20482:2026(en)
ii
ISO/DIS 20482:2026(en)
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 Testing equipment . 3
7 Test piece . 3
8 Test conditions . 4
9 Procedure . 4
10 Test report . 4
Annex A (informative) Example composition of the graphite grease . 6
Bibliography . 7

iii
ISO/DIS 20482:2026(en)
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
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has been established has the right to be represented on that committee. International organizations,
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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).
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
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Any trade name used in this document is information given for the convenience of users and does not
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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.
This third edition cancels and replaces the second edition (ISO 20482:2013), which has been technically
revised.
The main changes are as follows:
— the definition on “through crack” in 3.1 has been partially modified;
— the dimension line for “h ” in Figure 1 has been corrected;
— the first sentence in 6.2 has been partially modified and the second sentence has been added in 6.2;
— “shall” in the first sentence of 6.4 has been replaced by “should”;
— ISO 21920-2 has been added as referenced document in 6.4.2;
— ISO 3290-1 has been added as referenced document in 6.9;
— a clarification regarding an example composition of the graphite grease is added in 9.2 and Annex A;
— Additional specifications are given, if a sudden drop in force is used rather than the visual appearance of
the crack in 9.6
— Information are given about the rounding of the h readings and about decimal places regarding product
standards or special agreements.
— “by the parties involved” has been added in e) and f) of 10;
— “(IE, IE , IE , IE , depending on the bore diameter d used for the tests) and each of the individual
40 21 11 2
values before averaging” has been added in f) of 10;
— Annex A has been revised throughout.

iv
ISO/DIS 20482:2026(en)
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.

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