September 29, 2020

Example of pitting after corrosion testing in accordance with ASTM G48 Method A . The test temperature of 22 °C is too aggressive for lean duplex grades such. Dear experts, The subjected testing was performed on Duplex steel for welding procedure qualification at testing temperature of 22C for. Abstract ASTM G48 – “Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride.

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The Eng-Tips staff will check this out and take appropriate action. Method E — Critical pitting temperature test for stainless merhod. I also note your good friend the “highly esteemed Doctor Crisi” has disappeared from this issue after his glaring faux pas. Samples shall not be pickled or passivated prior to test.

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G48 A method is designed to determine the relative pitting resistance of stainless steels and nickel-base, chromium bearing alloys. Proceedings of an International Conference Submersible Technology: However all tests have to be documented, results to be assessed by client and fabricators, with the Maximum Engineering Integrity of the components being the prime criteria. Which test do I need? I never disagreed with your conclusion, and in the original thread I acknowledged it also A h air passivation after grinding or pickling is sufficient to minimize these differences 8.

Therefore, grinding and pickling of the specimen will mean that the results may not be representative of the conditions of the actual piece from which the sample was taken. Method E — Critical pitting temperature test for stainless steels.

The crevice former contact area of Method B is a Other units are given in parentheses for information only. The torque applied to the bolting assembly is 0. Stephan, I totally disagree with your viewpoint, noble?


For your information the test temperature of the G48’s were 40C. A and B are for qualification of alloys to pitting and crevice corrosion at specific temperatures, C and D are for determining the critical pitting and crevice corrosion temperatures of chromium and nickel alloys, and E and F are for stainless alloys.

If the results for 4g8 and consumables are satisfactory then only pursue 72 hrs test for weld coupons. Were the pitting marks on the face surface, or the root surface? Please share this page: Contact our corrosion experts today!

By Joey Date Are you an Engineering professional? In any event, have a happy new year billy and thanks for sharing!!! Dear experts, The subjected testing was performed on Duplex steel for welding procedure qualification at testing temperature of 22C for suggested time period of 72 hours as per ASTM G48 using Method A. For some b48 or reasons they consider important, Nordic has introduced some changes into the original ASTM specification and they state clearly that their materials are asttm according to that revised spec.

This should indicate if you have any intermetallic phases present. The three crevice tests, Methods B, D and F, vary in crevice-former contact area and crevice gap thickness.

Are you working with a cast duplex product? Namely, that flux cored wires can show sometimes quite different behaviour ast both welding- and metallurgical aspects compared to solid wires. Close this window and log in.

Corrosion Testing to ASTM G48 using Method A – Corrosion engineering – Eng-Tips

Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden. Respectfully, Henry Bill, It’s really unfortunate that your attitude, tone of message, total lack professionalism continues to describe you as accurate as ever!!! You have did nothing but back-peddle on this issue ever since and try and deflect issues towards my aggressive nature. Secondly, have you done an A test? Exposure time shall be 24 hours. Go to this Youtube link and see some Anderson Sylva knockouts!


Register now while it’s still free! Perhaps it would be worth it however, to ask around on the experience of the forum fellow members with the shielding gases used to weld duplex -or similar materials.

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I still think you do not methid it. And it just goes on, and on, and on, and on Crisi Date But like I mentioned, I don’t know how especially these material types are susceptible to such degradations.

Go to this Youtube link and see some Anderson Sylva knockouts! Consequently, the degree of corrosion damage that occurs during testing will generally be greater than that in natural environments in any similar time period. Could any one explain the potential reasons for the failure and moreover what countermeasures shall be considered to avoid repeated failure?

Puget Sound Olympic – Section On the plus side I have really appreciated some of the links you have provided and hope you continue to provide these. If testing protocol isn’t the problem I would look at composition and solution treatment for answers. A summary of the methods is listed in Table 1 below.

We hired an independant 3rd party to perform corrosion testing to G48 Method A as per client requirements but by mistake 3rd party booked the specimen to A and testing was done also to A and result is OK. I believe the OP of this on-going, never ending thread actually stated that the corrosion tests were performed to Norsok Standard, quote OP: