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[MW:34834] ASTM A 262 Practice C IGC test for Incoloy 825 material

By Materials & Welding

Dear All,

In ASTM G28 test methods, under test time duration in clause 3, for Alloy N08825, a note is given as " While the ferric sulfate-sulfuric acid test does detect susceptibility to intergranular corrosion in Alloy N08825, the boiling 65 % nitric acid test, Practices A262, Practice C, for detecting susceptibility to intergranular corrosion in stainless steels is more sensitive and should be used if the intended service is nitric acid". Please refer to the attached picture.

1. Does this means only ASTM A 262 Practice C is enough and no need for ASTM G28 method for Incoloy 825 materials under nitric acid services?.
2. Also The Huey test (method C) is only for molybdenum-free grades, such as 304L, as alloys with molybdenum show high rates of attack in this test. But Incoloy 825 contains Molybdenum, So how can we use this test method for Incoloy 825.

Regards,

Thulaib Hussain

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