SIST EN ISO 8491:2004
(Main)Metallic materials - Tube (in full section) - Bend test (ISO 8491:1998)
Metallic materials - Tube (in full section) - Bend test (ISO 8491:1998)
This International Standard specifies a method for determining the ability of full-section metallic tubes of circular cross-section to undergo plastic deformation in bending. It is intended for tubes with an outside diameter no greater than 65 mm, although the range of the outside diameter for which this International Standard is applicable may be more exactly specified in the relevant product standard.
NOTE - Bend tests of the test pieces taken from tubes in the form of transverse strips should be made in accordance with ISO 7438 so as to increase the original curvature of the test piece.
Metallische Werkstoffe - Rohr (Rohrabschnitt) - Biegeversuch (ISO 8491:1998)
In dieser Internationalen Norm ist ein Verfahren festgelegt, mit dem die Eignung von Rohren aus metallischen Werkstoffen mit kreisförmigem Querschnitt mit maximalem Außendurchmesser von 65 mm zur Biegung bei vollem Querschnitt bestimmt wird. Der Bereich der Außendurchmesser, für den diese Internationale Norm zutrifft, kann genauer in der entsprechenden Erzeugnisnorm festgelegt sein.
ANMERKUNG Biegeprüfungen von Proben, die aus Rohren in Form von Querstreifen entnommen wurden, sollten nach ISO 7438 so vorgenommen werden, dass die ursprüngliche Krümmung der Probe während des Versuchs noch vergrößert wird.
Matériaux métalliques - Tubes - Essai de cintrage sur tronçon (ISO 8491:1998)
La présente Norme internationale spécifie une méthode de détermination de l'aptitude à la déformation plastique par cintrage sur tronçon de tubes métalliques, de section circulaire. Elle est applicable aux tubes de diamètre extérieur au plus égal à 65 mm, bien que la gamme de diamètres extérieurs à laquelle s'applique la présente Norme internationale puisse être définie de façon plus explicite dans la norme de produit concernée.
NOTE - Il convient que les essais de pliage d’éprouvettes prélevées sur des tubes sous forme de bandes transversales soient réalisés conformément aux prescriptions de l’ISO 7438 par augmentation de la courbure initiale de la bande.
Kovinski materiali – Cev (narezana na dolžino) – Upogibni preskus (ISO 8491:1998)
General Information
- Status
- Published
- Publication Date
- 31-Oct-2004
- Technical Committee
- IFEK - Ferrous metals
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Nov-2004
- Due Date
- 01-Nov-2004
- Completion Date
- 01-Nov-2004
Relations
- Effective Date
- 01-Jul-2005
Overview
EN ISO 8491:2004 (ISO 8491:1998) defines a standardized bend test for full-section metallic tubes of circular cross‑section. The standard specifies the method to determine the ability of tubes to undergo plastic deformation in bending. It is intended primarily for tubes with an outside diameter up to 65 mm, unless a product standard specifies a different range. EN ISO 8491:2004 was adopted by CEN without modification and supersedes older EN provisions for tube bend testing.
Key topics and requirements
- Scope: Bend testing of full‑section circular metallic tubes to assess plastic deformation capacity (OD typically ≤ 65 mm).
- Test principle: Bend a straight tube around a grooved former of specified inside radius (r) until the specified angle of bend (α) is reached.
- Testing equipment:
- Tube‑bending machines designed to prevent section ovality.
- Bend former must have a groove matching the tube outside diameter; groove radius, depth and ovality tolerance affect results.
- Test piece: A straight portion of tube of sufficient length to perform the bend on the machine.
- Procedure and conditions:
- Ambient testing normally between 10 °C and 35 °C; controlled testing at (23 ± 5) °C.
- Ensure full contact between test piece and former over the bend length.
- For welded tubes, the weld is normally positioned at 90° to the plane of bending (neutral axis) unless the product standard states otherwise.
- Interpretation:
- Follow requirements in the relevant product standard where provided.
- If not specified, the tube passes if no cracks are visible without magnification.
- Test report must include at least: reference to ISO 8491, test-piece identification and dimensions, angle α and radius r, weld position (if relevant) and test result.
Applications
- Quality control and mechanical testing of metallic tubes used in piping, structural, automotive and industrial applications.
- Verification of tube ductility and forming performance prior to fabrication or certification.
- Supporting product specifications, supplier acceptance testing and failure analysis for bent tube components.
- Useful where bending performance and resistance to cracking under plastic deformation are critical.
Who uses this standard
- Tube manufacturers and mill test laboratories
- Third‑party inspection and certification bodies
- Design and fabrication engineers specifying tube forming requirements
- Procurement and quality assurance teams responsible for material acceptance
Related standards
- ISO 7438 - Bend test for test pieces taken from tubes as transverse strips (referenced for strip tests).
- EN/ISO product standards for specific tube types may specify applicable radii, angles and acceptance criteria; EN ISO 8491:2004 supersedes earlier EN 10232 provisions for bend testing.
Keywords: EN ISO 8491:2004, ISO 8491, tube bend test, metallic tubes, circular cross‑section, tube‑bending machine, bend radius, mechanical testing of metals.
Frequently Asked Questions
SIST EN ISO 8491:2004 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Metallic materials - Tube (in full section) - Bend test (ISO 8491:1998)". This standard covers: This International Standard specifies a method for determining the ability of full-section metallic tubes of circular cross-section to undergo plastic deformation in bending. It is intended for tubes with an outside diameter no greater than 65 mm, although the range of the outside diameter for which this International Standard is applicable may be more exactly specified in the relevant product standard. NOTE - Bend tests of the test pieces taken from tubes in the form of transverse strips should be made in accordance with ISO 7438 so as to increase the original curvature of the test piece.
This International Standard specifies a method for determining the ability of full-section metallic tubes of circular cross-section to undergo plastic deformation in bending. It is intended for tubes with an outside diameter no greater than 65 mm, although the range of the outside diameter for which this International Standard is applicable may be more exactly specified in the relevant product standard. NOTE - Bend tests of the test pieces taken from tubes in the form of transverse strips should be made in accordance with ISO 7438 so as to increase the original curvature of the test piece.
SIST EN ISO 8491:2004 is classified under the following ICS (International Classification for Standards) categories: 77.040.10 - Mechanical testing of metals. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN ISO 8491:2004 has the following relationships with other standards: It is inter standard links to SIST EN 10232:1998. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN ISO 8491:2004 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2004
1DGRPHãþD
SIST EN 10232:1998
Kovinski materiali – Cev (narezana na dolžino) – Upogibni preskus (ISO
8491:1998)
Metallic materials - Tube (in full section) - Bend test (ISO 8491:1998)
Metallische Werkstoffe - Rohr (Rohrabschnitt) - Biegeversuch (ISO 8491:1998)
Matériaux métalliques - Tubes - Essai de cintrage sur tronçon (ISO 8491:1998)
Ta slovenski standard je istoveten z: EN ISO 8491:2004
ICS:
77.040.10 Mehansko preskušanje kovin Mechanical testing of metals
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN ISO 8491
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2004
ICS 77.040.10 Supersedes EN 10232:1993
English version
Metallic materials - Tube (in full section) - Bend test (ISO
8491:1998)
Matériaux métalliques - Tubes - Essai de cintrage sur Metallische Werkstoffe - Rohr (Rohrabschnitt) -
tronçon (ISO 8491:1998) Biegeversuch (ISO 8491:1998)
This European Standard was approved by CEN on 1 July 2004.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8491:2004: E
worldwide for CEN national Members.
Foreword
The text of ISO 8491:1998 has been prepared by Technical Committee ISO/TC 164
"Mechanical testing of metals” of the International Organization for Standardization (ISO) and
has been taken over as EN ISO 8491:2004 by Technical Committee ECISS/TC 29 "Steel
tubes and fittings for steel tubes", the secretariat of which is held by UNI.
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 January 2005, and conflicting national
standards shall be withdrawn at the latest by January 2005.
This document supersedes EN 10232:1993.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Endorsement notice
The text of ISO 8491:1998 has been approved by CEN as EN ISO 8491:2004 without any
modifications.
INTERNATIONAL ISO
STANDARD 8491
Second edition
1998-11-01
Metallic materials — Tube (in full section) —
Bend test
Matériaux métalliques — Tubes — Essai de cintrage sur tronçon
A
Reference number
ISO 8491:1998(E)
ISO 8491:1998(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 Electrotech
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