不锈钢抗晶间腐蚀的测定. 第3部分: 低铬铁素体不锈钢腐蚀试验

[中文适用范围]： 本文件规定了低Cr晶间腐蚀敏感性的测定[Cr低于16%、Ni低于0.3%、Ti低于0.3%、Nb低于0.3%、Nb低于0.3% %（Ti + 原子重量比 Nb）] 0.5% 硫酸/硫酸铜测试中的铁素体不锈钢。 它还指定了可以分配给测试的目的。 该方法适用于以轧制板材和焊管形式供应的、用于弱氧化性酸性介质的不锈钢。 需要注意的是，腐蚀试验的结果仅对试验中使用的腐蚀性介质严格有效。 它构成了估计抗晶间腐蚀能力的基础，但不能用于检查对其他形式腐蚀（一般腐蚀、点蚀、应力腐蚀等）的抵抗能力。 对于用户来说，在使用钢材的地方适应指定的腐蚀测试非常重要。 在任何情况下，该测试均不被视为金属质量的绝对标准。 [外文原描述]： ISO 3651-3:2017 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 + Atomic weight ratio 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. 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. 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 cannot be used to check resistance to other forms of corrosion (general corrosion, pitting, stress corrosion, etc.). It is important for the user to adapt the specified corrosion test where steels are used. This test is, in no case, considered as an absolute criterion of the quality of the metal.