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ISO 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. This part of ISO specifies methods for the determination of the resistance to intergranular corrosion of ferritic, austenitic and ferritic-austenitic duplex stainless steels in media containing sulfuric acid.
It also specifies the purposes which may be assigned to the test. The test methods included are:. The methods are applicable to stainless steels supplied in the form of cast, rolled or forged products and tubes and intended for use in a mildly oxidizing acid medium for example, sulfuric acid, phosphoric acid.
The metal is inspected after having undergone a heat treatment for sensitization which can be a heat treatment or welding for sensitization. In order to verify the intrinsic resistance to intergranular corrosion, it is necessary to carry out a heat treatment for sensitization for stabilized steels and steels with low carbon content.
The sensitization heat treatment can be:. 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 not specifie d, heat treatment T1 shall be applied. Cracking that originates at the edge of the specimen should be disregarded.
BS EN ISO 3651-2
BS EN ISO 3651-2:1998-07-15