How to Select an Intergranular Corrosion Test Method

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Applicable scenarios and evaluation criteria for the various methods in GB/T 4334 and ASTM A262.

Commonly used intergranular corrosion tests:

- Copper sulfate–sulfuric acid method (GB/T 4334 Method E / ASTM A262 Practice E): suitable for austenitic stainless steels, to check sensitization tendency.
- Nitric acid method (Practice C): boiling 65% nitric acid, to assess long-term corrosion resistance.
- Ferric sulfate method (Practice B): rapid screening.

Basis for selection: material type, service medium, and customer requirements. For welded components, specimens should be taken from the weld and heat-affected zone.

Evaluation: observe cracks after bending or measure the weight-loss rate. The report must state the test method, duration, and evaluation criteria.

本文由 SteelWe 编辑与行业专家整理，内容仅供行业交流参考，不构成交易或投资建议。引用请注明来源。

How to Select an Intergranular Corrosion Test Method

Applicable scenarios and evaluation criteria for the various methods in GB/T 4334 and ASTM A262.

Commonly used intergranular corrosion tests:

- Copper sulfate–sulfuric acid method (GB/T 4334 Method E / ASTM A262 Practice E): suitable for austenitic stainless steels, to check sensitization tendency.
- Nitric acid method (Practice C): boiling 65% nitric acid, to assess long-term corrosion resistance.
- Ferric sulfate method (Practice B): rapid screening.

Basis for selection: material type, service medium, and customer requirements. For welded components, specimens should be taken from the weld and heat-affected zone.

Evaluation: observe cracks after bending or measure the weight-loss rate. The report must state the test method, duration, and evaluation criteria.

本文由 SteelWe 编辑与行业专家整理，内容仅供行业交流参考，不构成交易或投资建议。引用请注明来源。