GB/T 32571-2016 Corrosion of metals and alloys.Corrosion test for intergranular corrosion susceptibility of high-Cr ferritic stainless steels (English Version)
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest
GB/T 32571-2016
Scope
This standard specifies the sample, test solution, test instruments and equipment, test conditions and procedures, test result evaluation and test report of the intergranular corrosion test method for high-chromium ferritic stainless steel. This standard applies to the intergranular corrosion test of ferritic stainless steel with a chromium content of not less than 16%. Include the following four test methods (Table A.1 in Appendix A lists the stainless steel grades applicable to each method): a) Method W 10% oxalic acid etching test method is applicable to the screening of intergranular corrosion susceptibility of ferritic stainless steel For the test, after the sample is electrolytically etched in 10% oxalic acid solution, observe the metallographic structure of the etched surface under a microscope to determine whether it is necessary to carry out the long-term hot acid test of method X, method Y, and method Z. b) Method X sulfuric acid-ferric sulfate corrosion test method is suitable for evaluating intergranular corrosion tendency by weight loss or microscope observation after boiling ferritic stainless steel in sulfuric acid-ferric sulfate solution. c) Method Y copper-copper sulfate-50% sulfuric acid corrosion test method is suitable for evaluating intergranular corrosion tendency by weight loss or microscope observation after boiling ferritic stainless steel in copper-copper sulfate-50% sulfuric acid solution. d) Method Z Copper-copper sulfate-16% sulfuric acid corrosion test method is suitable for judging intergranular corrosion tendency by bending or metallographic examination after ferritic stainless steel is boiled in copper-copper sulfate-16% sulfuric acid solution.
GB/T 32571-2016 Referenced Document
GB/T 20878-2007 Stainless and heat-resisting steels Designation and chemical composition