EN ISO 7539-3:1995

Corrosion of metals and alloys - Stress corrosion testing - Part 3: Preparation and use of U-bend specimens (ISO 7539-3:1989)

Covers procedures for designing, preparing and using U-bend test specimens. These specimens may be used to test a variety of product forms (for example sheet, plate, flat extruded material, wire or rod). The principal acvantages of the U-bend test are its simplicity and its adaptability for use in plants. A disadvantage is that stesses cannot be quantified with accuracy. U-bend specimens made from high strength materials may fracture rapidly and can be dangerous.

Korrosion der Metalle und Legierungen - Prüfung der Spannungsrißkorrosion - Teil 3: Vorbereitung und Anwendung von Bügelproben (ISO 7539-3:1989)

Der vorliegende Teil von ISO 7539 behandelt Verfahren für die Gestaltung, Vorbereitung und Anwendung von Bügelproben (U-Bögen) zur Untersuchung der Anfälligkeit von Werkstoffen für Spannungsrißkorrosion. In diesem Teil von ISO 7539 werden mit der Benennung "Metall" auch Legierungen erfaßt. Bügelproben können zum Prüfen einer Vielzahl von Erzeugnisformen verwendet werden. Grundsätzlich werden sie für Band, Blech oder flaches, stranggepreßtes Material verwendet, aus welchem leicht flache Proben mit rechteckigem Querschnitt zu fertigen sind.

Corrosion des métaux et alliages - Essais de corrosion sous contrainte - Partie 3: Préparation et utilisation des éprouvettes cintrées en U (ISO 7539-3:1989)

1.1 La présente partie de l'ISO 7539 couvre les procédures de définition, de préparation et d'utilisation d'éprouvettes cintrées en U, servant à évaluer la sensibilité d'un métal à la corrosion sous contrainte. Pour les besoins de la présente partie de l'ISO 7539, le terme « métal » inclut également les alliages. 1.2 Les éprouvettes cintrées en U peuvent être utilisées pour tester une multitude de formes de produits. Elles sont principalement utilisées pour les tôles, plaques ou matériaux profilés, qui fournissent facilement des éprouvettes plates de section rectangulaire, mais peuvent être employées également pour les matériaux moulés, les fils métalliques ou les barres, sous la forme d'éprouvettes usinées de section circulaire. Elles peuvent aussi être utilisées pour des pièces assemblées par soudage. 1.3 Les éprouvettes cintrées en U sont fréquemment utilisées pour déterminer si un métal est sensible à la corrosion fissurante sous contrainte dans un environnement donné. Ce type d'essai est réalisé en laboratoire pour classer les matériaux selon leur sensibilité, aux fins d'applications spécifiques et, dans des environnements de service, pour évaluer le risque de rupture. 1.4 Les principaux avantages de l'essai résident dans sa simplicité et son adaptabilité subséquente à l'application en usine. Le procédé présente, par contre,  191 un inconvénient en ce sens qu'il ne permet pas de quantifier les contraintes et doit donc être remplacé par une autre méthode si une quantification s'avère indispensable.

Korozija kovin in zlitin - Ugotavljanje pokanja zaradi napetostne korozije - 3. del: Priprava in uporaba preskušancev v obliki črke U (U-upognjenci) (ISO 7539-3:1989)

General Information

• Status: Published
• Publication Date: 30-May-1995
• ICS: 77.060 - Corrosion of metals
• Technical Committee: CEN/TC 262 - Metallic and other inorganic coatings
• Drafting Committee: CEN/TC 262/WG 2 - Hot dip galvanized coatings
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 02-Nov-2009
• Completion Date: 02-Nov-2009
• Ref Project: SIST EN ISO 7539-3:1999 - Corrosion of metals and alloys - Stress corrosion testing - Part 3: Preparation and use of U-bend specimens (ISO 7539-3:1989)

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-1999
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3ULSUDYDLQXSRUDEDSUHVNXãDQFHYYREOLNLþUNH88XSRJQMHQFL,62
Corrosion of metals and alloys - Stress corrosion testing - Part 3: Preparation and use of
U-bend specimens (ISO 7539-3:1989)
Korrosion der Metalle und Legierungen - Prüfung der Spannungsrißkorrosion - Teil 3:
Vorbereitung und Anwendung von Bügelproben (ISO 7539-3:1989)
Corrosion des métaux et alliages - Essais de corrosion sous contrainte - Partie 3:
Préparation et utilisation des éprouvettes cintrées en U (ISO 7539-3:1989)
Ta slovenski standard je istoveten z: EN ISO 7539-3:1995
ICS:
77.060 Korozija kovin Corrosion of metals
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL
ISO
STANDARD
7539-3
First edition
1989-12-01
Corrosion of metals and alloys - Stress
corrosion testing -
Part 3:
Preparation and use of U-bend specimens
Corrosion des mhtaux et alliages - Essais de corrosion sous contrainte -
Partie 3: Preparation et utilisation des hprouvettes cintrdes en U
Reference number
ISO 7539-3 : 1989 (E)
ISO 7539-3 : 1989 (El
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of
national Standards bodies (ISO member bedies). The work of preparing International
Standards is normally carried out through ISO technical committees. Esch 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, govern-
. .
mental and non-governmental, in liaison with ISO, also take patt in the work. ISO
collaborates closely with the International Electrotechnical Commission (IEC) on all
matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the ISO Council. They are approved in accordance with ISO procedures requiring at
least 75 % approval by the member bodies voting.
International Standard ISO 7539-3 was prepared by Technical Committee ISO/TC 156,
Corrosion of metals and alfoys.
ISO 7533 consists of the following Parts, under the general title Corrosion of metals
and alloys - Stress corrosion testing :
-
Part 1: General guidance on testing procedures
-
Part 2: Preparation and use of bent-beam specimens
-
Part 3: Preparation and use of U-bend specimens
-
Part 4: Preparation and use of uniaxially loaded tension specimens
-
Part 5: Preparation and use of C-ring specimens
-
Part 6: Preparation and use of pre-cracked specimens
-
Part 7: Slow strain rate testing
-
Part 8: Preparation and use of welded specimens
0 ISO 1989
All rights reserved. No part of this publication may be reproduced or utilized in any form or by any
means, electronie or mechanical, including photocopying and microfilm, without Permission in
writing from the publisher.
International Organization for Standardization
Case postale 56 l CH-121 1 Geneve 20 l Switzerland
Printed in Switzerland
ii
ISO 7539-3 : 1989 (EI
Introduction
This part of ISO 7539 is one of a series giving procedures for designing, preparing and
using various forms of test specimen to carry out tests to establish a metals resistance
to stress corrosion.
Esch of the Standards in the series needs to be read in association with ISO 75394.
This helps in the choice of an appropriate test procedure to suit particular cir-
cumstances as weil as giving guidance towards assessing the significance of the
results of the tests.
This page intentionally lefl blank

INTERNATIONAL STANDARD ISO 7539-3 : 1989 (E)
Corrosion of metals and alloys - Stress corrosion
testing -
Part 3:
Preparation and use of U-bend specimens
WARNING - U-bend specimens made from high strength materials may fracture rapidly; pieces may fly off at high
velocity and tan be dangerous. Personne1 installing and examining specimens must be made aware of this possiblity and
be protected against injury.
ISO 7539-1 : 1987, Corrosion of metal and alloys - Stress
1 Scope
corrosion testing - Part 7: General guidance on testing
procedures.
1.1 This part of ISO 7539 covers procedures for designing,
preparing and using U-bend test specimens for investigating
the susceptibility of a metal to stress corrosion.
3 Definitions
The term “metal” as used in this patt of ISO 7539 includes
For the purposes of this part of ISO 7539, the definitions given
alloys.
in ISO 7539-1 are applicable.
1.2 U-bend specimens may be used to test a variety of
product forms. They are used principally for sheet, plate or flat
4 Principle
extruded material, which conveniently provides flat specimens
of rectangular Cross-section, but may also be employed for wire
4.1 The test consists in exposing to the corroding medium a
or rod, or for machined specimens of circular Cross-section.
piece of metal bent into a U-shape and held in a manner which
They tan also be used for Parts joined by welding.
ensures that there are initial tensile Stresses ranging up to the
yield Point over a proportion of the surface. In the act of
1.3 The U-bend test is frequently used to establish whether a
forming specimens, varying amounts of cold work may be
metal is susceptible to stress corrosion cracking in a given
introduced and this deformation may influence the stress
environment. lt is used in laboratories to Screen materials for
corrosion cracking tendency as compared to that of the
susceptibility for specific applications and in Service environ-
material in the original condition.
ments to assess the risk of failure.
4.2 The test may be performed under laboratory conditions
1.4 The principal advantages of the test are its simplicity and
by exposing the specimens to simulated Service conditions or it
its consequent adaptability for use in plant. A d
...