BS ISO 3651-3:2017

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Preparation of test specimens
5 Test methods
6 Evaluation by metallographic examination
7 Test report
Bibliography

Describes the determination of the intergranular corrosion susceptibility of low-Cr [less than 16% Cr, less than 0,3% Ni, less than 0,3% Ti and less than 0,3% Nb, less than 0,3% (Ti + Atomic weight ratio Nb)] ferritic stainless steels in the 0,5% sulfuric acid/copper sulfate test.

1.1 This International Standard specifies the determination of the intergranular corrosion susceptibility of low-Cr (less than 16 % Cr, less than 0,3 % Ni, less than 0,3 % Ti and less than 0,3 % Nb, less than 0,3 % (Ti + Nb)) ferritic stainless steels in the 0,5 % sulfuric acid /copper sulfate test. It also specifies the purposes which may be assigned to the test.

1.2 The method is applicable to stainless steels supplied in the form of rolled sheets and welded tubes and intended for use in a mildly oxidizing acid medium.

NOTE It is important to note that the result of the corrosion test is only strictly valid for the corrosive medium used in the test. It constitutes a basis for estimating the resistance to intergranular corrosion but may not be used to check resistance to other forms of corrosion (uniform corrosion, pitting, stress corrosion, etc.). It is necessary for user to adapt the specified corrosion test to the use which will be made of the steels. This test should, in no case, be considered as an absolute criterion of the quality of the metal.