SIST EN ISO 3651-2:2000
(Main)Determination of resistance to intergranular corrosion of stainless steels - Part 2: Ferritic, austenitic and ferritic-austenitic (duplex) stainless steels - Corrosion test in media containing sulfuric acid (ISO 3651-2:1998)
Determination of resistance to intergranular corrosion of stainless steels - Part 2: Ferritic, austenitic and ferritic-austenitic (duplex) stainless steels - Corrosion test in media containing sulfuric acid (ISO 3651-2:1998)
This European standard specifies a method for the determination to intergranular corrosion of austenitic stainless steels in a sulphuric acid/copper sulphate medium in the presence of copper turnings (Monnypenny Strauss test). The method is applicable only to austenitic stainless steels supplied in the form of cast, rolled or forged products and tubes and intended to be used in a mildly oxidizing acid medium (for example sulphuric or phosphoric acids).
Ermittlung der Beständigkeit nichtrostender Stähle gegen interkristalline Korrosion - Teil 2: Nichtrostende ferritische, austenitische und ferritisch-austenitische (Duplex-) Stähle Korrosionsversuch in schwefelsäurehaltigen Medien (ISO 3651-2:1998)
Dieser Teil von ISO 3651 legt Verfahren zur Ermittlung der Beständigkeit von nichtrostenden ferritischen, austenitischen und ferritisch-austenitischen (Duplex-) Stählen gegen interkristalline Korrosion in Medien fest, die Schwefelsäure enthalten. Außerdem wird festgelegt, welchen Zweck diese Prüfung verfolgt. Es werden mehrere Prüfverfahren beschrieben: Verfahren A: Versuch in einer Lösung aus Kupfersulfat und 16%iger Schwefelsäure (Strauß-Test); Verfahren B: Versuch in einer Lösung aus Kupfersulfat und 35 %iger Schwefelsäure Verfahren C: Versuch in einer Lösung aus Eisen (III)-sulfat und 40 %iger Schwefelsäure.
Détermination de la résistance a la corrosion intergranulaire des aciers inoxydables - Partie 2: Aciers inoxydables ferritiques, austénitiques et austéno-ferritiques (duplex) - Essais de corrosion en milieux contenant de l'acide sulfurique (ISO 3651-2:1998)
Ugotavljanje odpornosti nerjavnih jekel proti medkristalni koroziji - 2. del: Feritna, avstenitna in feritno-avstenitna (dupleksna) nerjavna jekla - Korozijski preskus v mediju, ki vsebuje žveplovo kislino (ISO 3651-2:1998)
General Information
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Ugotavljanje odpornosti nerjavnih jekel proti medkristalni koroziji - 2. del: Feritna, avstenitna in feritno-avstenitna (dupleksna) nerjavna jekla - Korozijski preskus v mediju, ki vsebuje žveplovo kislino (ISO 3651-2:1998)Ermittlung der Beständigkeit nichtrostender Stähle gegen interkristalline Korrosion - Teil 2: Nichtrostende ferritische, austenitische und ferritisch-austenitische (Duplex-) Stähle Korrosionsversuch in schwefelsäurehaltigen Medien (ISO 3651-2:1998)Détermination de la résistance a la corrosion intergranulaire des aciers inoxydables - Partie 2: Aciers inoxydables ferritiques, austénitiques et austéno-ferritiques (duplex) - Essais de corrosion en milieux contenant de l'acide sulfurique (ISO 3651-2:1998)Determination of resistance to intergranular corrosion of stainless steels - Part 2: Ferritic, austenitic and ferritic-austenitic (duplex) stainless steels - Corrosion test in media containing sulfuric acid (ISO 3651-2:1998)77.060Korozija kovinCorrosion of metalsICS:Ta slovenski standard je istoveten z:EN ISO 3651-2:1998SIST EN ISO 3651-2:2000en01-februar-2000SIST EN ISO 3651-2:2000SLOVENSKI
STANDARD
SIST EN ISO 3651-2:2000
SIST EN ISO 3651-2:2000
SIST EN ISO 3651-2:2000
AReference numberISO 3651-2:1998(E)INTERNATIONALSTANDARDISO3651-2Second edition1998-05-15Determination of resistance to intergranularcorrosion of stainless steels —Part 2:Ferritic, austenitic and ferritic-austenitic(duplex) stainless steels — Corrosion testin media containing sulfuric acidDétermination de la résistance à la corrosion intergranulaire des aciersinoxydables —Partie 2: Aciers inoxydables ferritiques, austénitiques et austéno-ferritiques(duplex) — Essais de corrosion en milieux contenant de l'acide sulfuriqueSIST EN ISO 3651-2:2000
ISO 3651-2:1998(E)©
ISO 1998All rights reserved. Unless otherwise specified, no part of this publication may be reproducedor utilized in any form or by any means, electronic or mechanical, including photocopying andmicrofilm, without permission in writing from the publisher.International Organization for StandardizationCase postale 56 · CH-1211 Genève 20 · SwitzerlandInternetiso@iso.chPrinted in SwitzerlandiiContentsPage1Scope .12Purpose of the test .12.1Verification of the intrinsic resistance ofthe steel to intergranular corrosion .12.2Inspection of the efficiency of the solutiontreatment .23Sensitization treatment .23.1Sensitization heat treatment .23.2Sensitization by welding .24Corrosion test .24.1Principle .24.2Test pieces .24.3Preparation of test pieces .45Apparatus .56Test methods .56.1Method A .56.2Method B .56.3Method C .66.4Bend test .67Evaluation .78Test report .7Annex A
(informative)
Examples of application .8Annex B
(informative)
Comparison of commonlyavailable national standards and this partof ISO 3651 .9SIST EN ISO 3651-2:2000
© ISOISO 3651-2:1998(E)iiiForewordISO (the International Organization for Standardization) is aworldwide federation of national standards bodies (ISO memberbodies). The work of preparing International Standards is normallycarried out through ISO technical committees. Each member bodyinterested in a subject for which a technical committee has beenestablished has the right to be represented on that committee.International organizations, governmental and non-governmental, inliaison with ISO, also take part in the work. ISO collaborates closelywith the International Electrotechnical Commission (IEC) on allmatters of electrotechnical standardization.Draft International Standards adopted by the technical committeesare circulated to the member bodies for voting. Publication as anInternational Standard requires approval by at least 75 % of themember bodies casting a vote.International Standard ISO 3651-2 was prepared by TechnicalCommittee ISO/TC 17, Steel, Subcommittee SC 7, Methods oftesting (other than mechanical tests and chemical analysis).This second edition cancels and replaces the first edition(ISO 3651-2:1976), which has been technically revised.ISO 3651 consists of the following parts, under the general titleDetermination of resistance to intergranular corrosion of stainlesssteels:—Part 1: Austenitic and ferritic-austenitic (duplex) stainless steels— Corrosion test in nitric acid medium by measurement of lossin mass (Huey test)—Part 2: Ferritic, austenitic and ferritic-austenitic (duplex) stainlesssteels — Corrosion test in media containing sulfuric acidAnnexes A and B of this part of ISO 3651 are for information only.SIST EN ISO 3651-2:2000
ISO 3651-2:1998(E)© ISOivIntroductionThe term "intergranular corrosion test" denotes the corrosion testcarried out by means of preferential attack of the grain boundaries.Ferritic, austenitic and ferritic-austenitic (duplex) stainless steelsmay be subject to such an attack when they are held at atemperature between about 500 °C and 1 000 °C. This heat cycle,which may provoke sensitization to intergranular corrosion, mayoccur during hot-forming (forging, rolling) as the result of incorrectsolution treatment or during a welding operation.NOTE —
In the field of application of this test, intergranular corrosion may beconnected with the presence along the grain boundaries of a chromium-depletedregion due to precipitation of chromium carbides, sigma phase or otherintermetallic phases.SIST EN ISO 3651-2:2000
INTERNATIONAL STANDARD
© ISOISO 3651-2:1998(E)1Determination of resistance to intergranular corrosion of stainlesssteels —Part 2:Ferritic, austenitic and ferritic-austenitic (duplex) stainless steels —Corrosion test in media containing sulfuric acid1ScopeThis part of ISO 3651 specifies methods for the determination of the resistance to intergranularcorrosion of ferritic, austenitic and ferritic-austenitic (duplex) stainless steels in media containing sulfuricacid. It also specifies the purposes which may be assigned to the test. The test methods included are:—method A: the 16 % sulfuric acid/copper sulfate test (Monypenny Strauss test);—method B: the 35 % sulfuric acid/copper sulfate test;—method C: the 40 % sulfuric acid/ferric sulfate test.The methods are applicable to stainless steels supplied in the form of cast, rolled or forged productsand tubes and intended for use in a mildly oxidizing acid medium (for example, sulfuric acid, phosphoricacid).Unless specified in the product standard, the method to be used, A, B or C, shall form the subject of anagreement between the interested parties.Annex A gives examples of application of the three methods on stainless steels.NOTE —
It is important to note that the result of the corrosion test is only strictly valid for the corrosive medium used in thetest. It constitutes a basis for estimating the resistance to intergranular corrosion but may not be used to check resistance toother forms of corrosion (general corrosion, pitting, stress corrosion, etc.). It is necessary for the user to adapt the specifiedcorrosion test to the use which will be made of the alloy. These test should, in no case, be considered as an absolute criterionof the quality of the metal.2Purpose of the testThis intergranular corrosion test may have either of the purposes given in 2.1 and 2.2.2.1Verification of the intrinsic resistance of the steel to intergranular corrosionThis verification applies only to low carbon steels (C < 0,03 %) and stabilized steels specified forresistance to intergranular corrosion. The metal is inspected after having undergone a heat treatmentfor sensitization which can be a heat treatment or welding for sensitization (see clause 3).SIST EN ISO 3651-2:2000
ISO 3651-2:1998(E)© ISO22.2Inspection of the efficiency of the solution treatmentThis inspection is only carried out on thin products for which the cooling speed may be made sufficientlyrapid. It is only of interest for the steels which are not defined in 2.1. The metal is inspected in the statein which it is delivered to the user, without heat treatment for sensitization.3Sensitization treatment3.1Sensitization heat treatmentIn order to verify the intrinsic resistance to intergranular corrosion (see 2.1), it is necessary to carry outa heat treatment for sensitization for stabilized steels and steels with low carbon content.The sensitization heat treatment can be:—T1: heating the specimen at 700 °C ± 10 °C for 30 minutes followed by water cooling;—T2: heating the specimen at 650 °C ± 10 °C for 10 minutes followed by water cooling.The above defined treatments only apply to austenitic and duplex steels.The type of sensitization heat treatment shall be defined in the product standard or in the order. If notspecified, heat treatment T1 shall be applied.3.2Sensitization by weldingSensitization by the preparation of welded test pieces may be used as an alternative to 3.1, byagreement between the interested parties. Test pieces which are not solution annealed after weldingshall be tested in the as-welded condition. No additional sensitization heat treatment shall be performed.Sensitization by welding applies to all the stainless steels covered by this part of ISO 3651.4Corrosion test4.1PrincipleA test piece, prepared as specified in 4.2 and 4.3, is immersed in a solution according to method A, Bor C for a specified time. The test piece is then subjected to a bend test. The convex surface of the testpiece is examined after bending in order to reveal any cracks caused by intergranular corrosion.For small diameter tubes, up to 60 mm (tube diameter shall be compatible with the aperture of the flaskcontaining the solution), a flattening test is used instead of the bend test.4.2Test pieces4.2.1DimensionsThe test piece shall have a total surface area of 15 cm² to 35 cm². In the case of sheets with a thicknessgreater than 6 mm, the test piece shall have a maximum thickness of 6 mm and one of the rolledsurfaces shall be retained.SIST EN IS
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