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The solution shall be maintained at boiling during 20 h 5 h. 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. Incase of dispute, the duration of the test shall be 20 h. The test piece shall be bent to at least 90 over a mandrel with a radius not exceeding the thickness ofthe test piece.
Ferritic, austenitic and ferritic-austenitic duplex stainless steels. Ferritic, austenitic and ferritic-austenitic duplex stainlesssteels Corrosion test in media containing sulfuric acidAnnexes A and B of this part of ISO are for information only.
Each member bodyinterested in a subject for which a technical committee has beenestablished has the right to be represented on that committee. The copper filings may be reused if they are cleaned in warm tap water after each test. NOTE A determination of the weight loss may be used as a complement to the bend test or the flattening test for tubeswith up to 60 mm outside diameter according to 5.
BS EN ISO 3651-2:1998
The retained surface shall form the convex side of the test piece after bending. The test pieces are firstlyimmersed in the cold test solution following which the solution is brought to the boil, from which pointonwards the test duration commences. For cast products, the radius of the mandrel shall be no more than twice the thickness ofthe test piece.
Published on Dec View 69 Download International organizations, governmental and enn, inliaison with ISO, also take part in the work. In the case of the chemical preparation, it shall be necessary to ensure in advance that intergranularcorrosion does not occur due to the preparation. The test pieces are embedded in electrical gradecopper filings on the bottom of the flask. In case of dispute,the duration of the test shall be 20 h. Accept and continue Learn more about the cookies we use and how to change your settings.
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. Dstu en iso 2 Business. For welded tubes up to 60 mm outside diameter, the test piece shall be a full cross section of the tubeand will be subject to io flattening test see 6.
Thetest pieces iiso be in metallic contact with the copper but not with each other. The distance isp theplatens after flattening, measured under load, shall be no greater than the following ixo, H, inmillimetres: Essais de corrosion en milieux contenant de l’acide sulfurique. NOTE When an evaluation is questionable a metallographic examination of a longitudinal cross section of the test piecemay be used to detect the presence of intergranular corrosion and to measure the depth of penetration.
Nichtrostende ferritische, austenitische und ferritisch-austenitische Duplex- Staehle Korrosionsversuch in schwefelsaeurehaltigen Medien. 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.
Note that more than one method may be applicable for aspecific steel grade.
ISO (E)-Character PDF Document
Essais de corrosion en milieux contenant de l’acide sulfurique Title in German Ermittlung der Bestaendigkeit nichtrostender Staehle gegen interkristalline Korrosion. Unless otherwise stated on the order,the method of preparation shall be left to the manufacturer and shall be recorded in the test report.
Please download Chrome or Firefox or view our browser tips. The test solution shall not be used more than once. If it is questionnable whether intergranular corrosion is the cause of the cracking, a 90 bend test or aflattening test isso be carried out on a second test piece prepared in a similar way but without havingbeen submitted to the corrosion test.
The solution shall be maintained at boiling 20 h 5 h. The test methods included are: This second edition cancels and replaces the first edition ISO Determination of resistance to intergranular corrosion of stainless steels.
The corrosivesolution shall be used only once.