prEN ISO 20482

• 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
• Publication Date: 08-Feb-2028
• ICS: 77.040.10 - Mechanical testing of metals
• Technical Committee: ECISS/TC 101 - Test methods for steel (other than chemical analysis)
• Current Stage: 4020 - Submission to enquiry - Enquiry
• Start Date: 20-Aug-2026
• Completion Date: 20-Aug-2026
• Ref Project: oSIST prEN ISO 20482:2026 - Metallic materials - Sheet and strip - Erichsen cupping test (ISO/DIS 20482:2026)

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

prEN ISO 20482 is the CEN version of ISO/DIS 20482:2026 for the Erichsen cupping test on metallic sheet and strip. It specifies a standard test method for measuring how metallic materials deform plastically in stretch forming, so laboratories, producers and users can compare formability in a consistent way. For thicker material or narrower strip, the document also gives alternative tool dimensions and a modified designation system.

What does prEN ISO 20482 specify?

prEN ISO 20482 specifies the Erichsen cupping test for metallic sheets and strips with a thickness from 0.1 mm to 2 mm and a width of 90 mm or greater. It also covers special tool dimensions for thicker material and for narrower strips, where subscripts are used in the cupping index designation.

The document is organized into clauses on scope, normative references, terms and definitions, symbols and designations, principle, testing equipment, test piece, test conditions, procedure and test report. It also has one informative annex with an example graphite grease composition.

Annex	What it covers
A (informative)	Example composition of the graphite grease

What are the key requirements of prEN ISO 20482?

Clause 5 states the principle: a spherical punch presses into a clamped test piece until a through crack appears, and the indentation depth is taken as the test result. In practice, this means the test is a controlled formability check based on the punch travel at failure.

Test equipment and geometry

Clause 6 requires a machine with a die, punch and blank holder built to the dimensions and tolerances in Table 1. The machine must allow observation of the outside of the test piece so the operator can see the instant of cracking, or detect a sudden force drop and record that method in the report. This matters because the stopping point affects the reported cupping index.

Clause 6 also requires punch travel measurement with 0.1 mm scale division, sufficient rigidity of the tooling, and a Vickers hardness of at least 750 HV 30 on the working surfaces. The punch surface must be spherical and polished, with roughness Ra not exceeding 0.4 µm as defined in ISO 21920-2. In practice, the tooling condition must be controlled so the result reflects the material, not the equipment.

Test piece and conditions

Clause 7 requires a flat test piece prepared without burrs or distortion that would interfere with mounting or testing, and without prior hammering or hot or cold working. Clause 8 sets the general test temperature between 10 °C and 35 °C, with controlled testing at (23 ± 5) °C when required. This keeps preparation and temperature from changing the measured ductility.

Procedure and result

Clause 9 requires thickness measurement to the nearest 0.01 mm, light greasing of the contact surfaces, clamping with an approximately 10 kN holding force, smooth punch movement, and a test speed within the stated range. For standard tests the rate is between 5 mm/min and 20 mm/min, while narrower specimens use 5 mm/min to 10 mm/min.

Clause 9 also requires stopping the test when a through crack appears, or when a sudden force drop is used as the stop signal. The punch travel is then measured to the nearest 0.1 mm as h, and the Erichsen cupping index IE is the average of at least three readings unless product standards say otherwise. In practice, users need to report the way rupture was detected and how the average was formed.

Clause 10 lists the minimum report items: reference to ISO 20482, test piece identity and orientation, thickness, lubricant type, appearance after rupture when required, and the IE value plus the individual readings when required. This gives traceability for quality records, product certification and supplier comparisons.

What terms does prEN ISO 20482 define?

• Through crack - a crack that passes through the full thickness of the test piece and is wide enough to let light pass through part of its length.
• Erichsen cupping index (IE) - the measured indentation depth used as the test result, expressed in millimetres and averaged from repeated tests.
• Test piece - the flat specimen taken from the sheet or strip and mounted in the machine for the cupping test.
• Blank holder - the part that clamps the test piece against the die during forming.
• Punch - the spherical-ended tool that presses into the test piece to create the indentation.
• h - the depth of indentation measured at the end of the test.

Who uses prEN ISO 20482?

prEN ISO 20482 is used by mechanical testing laboratories, steel and metal sheet producers, product development teams, and quality managers who need a repeatable formability test. Buyers and specifiers use it when they want a documented method for comparing sheet and strip performance in stretch forming.

It is also relevant to process engineers and inspectors who set up incoming inspection, product qualification, or customer acceptance tests for flat metallic products. The report items and repeatable tooling make it useful when test results must be traceable across sites or suppliers.

What changed in prEN ISO 20482 from the previous edition?

prEN ISO 20482 cancels and replaces ISO 20482:2013 and states that it has been technically revised. The listed changes are:

• the definition of “through crack” in 3.1 was partially modified
• the dimension line for h in Figure 1 was corrected
• the first sentence in 6.2 was partially modified and a second sentence was added
• “shall” in the first sentence of 6.4 was replaced by “should”
• ISO 21920-2 was added in 6.4.2
• ISO 3290-1 was added in 6.9
• Annex A and 9.2 were clarified for graphite grease composition
• 9.6 adds specifications for using a sudden force drop instead of visual crack detection
• wording was added about rounding h readings and decimal places in product standards or special agreements
• the report wording in 10 was expanded
• Annex A was revised throughout

Which standards are used with prEN ISO 20482?

• ISO 21920-2 - provides the surface texture terms and the definition of Ra used for the punch roughness limit.
• ISO 3290-1 - allows hardened steel balls as an alternative to the punch specified in the test equipment clause.
• ISO 6743-9 - is used with the example graphite grease in the procedure and Annex A to classify the lubricant.

What does the prEN ISO 20482 document contain?

The document includes a schematic of the test arrangement and a table of symbols and dimensions for the standard and reduced-size tool sets. It gives the procedure steps for measuring thickness, applying lubricant, clamping, forming, stopping the test, and calculating the average result.

Annex A provides a worked example of graphite grease composition for use in the test. The bibliography points to ISO 3290-1 for the steel-ball alternative.

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.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
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.
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
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
Phone: [phone]
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: [e-mail]
Website: www.iso.org
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
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).
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 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.

v
...