ASTM A 763 Sensitization Testing of Ferritic Steels
Although it’s more commonly thought of with austenitic stainless steels, sensitization can also affect the ferritic stainless steels. Ferritic stainless steels such as the 430 series, 29-Cr alloys, and XM alloys all can be tested by the ASTM A763 methods to find sensitization. At G2MT Labs, we have experience with A763 (and the other common tests, A262 for austenitic stainless and G28 for nickel-alloys) so we can help you be confident in your steel’s quality. Our Houston corrosion laboratory can quickly provide you with test results backed by our ISO 9001 quality system.
About ASTM A763
The A 763 practice is similar to ASTM A 262; it includes four methods, W, X, Y, and Z:
- Method W is an oxalic acid etch test with microscopic examination.
- Method X is a ferric sulfate & sulfuric acid corrosion test with weight loss and microscopic examination.
- Method Y is a copper-copper sulfate & sulfuric acid corrosion test with weight loss and microscopic examination.
- Method Z is a ferric sulfate & sulfuric acid corrosion test with a bend test.
Generally, practice W is used as a screening test while X, Y, and Z are each used for various ferritic stainless stainless steel alloys to evaluate sensitization more quantitatively. A general selection guide for ferritic alloys is given in the A 763 standard.
Additional Corrosion Analysis Services
In many cases, our customers want to know more than just pass/fail test results. Our Houston corrosion laboratory can help characterize any corrosion that occurs, including:
- optical and electron microscopy
- metallurgical characterization
- FTIR, APS, XRD (x-ray diffraction), and other advanced analysis
- ASTM B117, and
- expert consulting.
If you have any questions about corrosion testing, we invite you to contact us today. We look forward to helping with ASTM A763 and other related corrosion analyses.