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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No matter what, the stake wont go down Prof Crisi Here is another link showing the suggestions and findings of Norsok: Mmethod is really important because, if it was on the g488 surface then, the culprit would more than likely be the ppm level of Oxygen within the purging gas as being too high, if that is where the pitting marks were found. I don’t know any end users who test for 72 hours.
Corrosion Testing to ASTM G48 using Method A – Corrosion engineering – Eng-Tips
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. If alloy consistently fails at the above specified testing regime, assuming that metallurgical factors are not contributors then the ways to asfm around it on GA test would be: Stephan, I totally disagree with your viewpoint, noble?
Method E — Critical pitting temperature test for stainless steels. Yet you still have this notion that I’ disagree with ytour conclusion and I do not understand why??? You obviously have not visited the U. This test method is designed solely for detection of the precipitation of detrimental intermetallic phases in duplex stainless steels.
Methods D and F use a multiple crevice assembly which has a number of grooves and plateaus and is attached to the test sample with an insulated bolt. Are the specimens with or without PWHT? Please advise, is it acceptable if we may submit TQ to client g448 lower the testing time to 24 hours instead of 72 hours for normal duplex wrought specimen because G48 is flexible on timings and suggests 72 hours although variations may also be used.
The recommended test time is 72 hours. If you have a generally sound wps.
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Practice A does not use acid. Our lab offers all 6 methods of this meethod as well as ASTM G, the electrochemical method for similar analysis. Don’t worry, we’re preparing the best soccer team human kind has ever seen.
She is neither third world nor underdeveloped. For your information the test temperature of the G48’s were 40C. Puget Sound Olympic – Section The FeCl 3 solution provides an aggressive environment to promote localized corrosion due to the presence of chloride ions, oxidizing conditions, and low pH.
Proceedings of an international conference Oceanology: And it just goes on, and on, and on, and on Client is not accepting the results and require to perform the testing to G48 Method A for 72 hours.
Where you cut a sample and grind the surfaces, no pickle or passivation allowed, and test in ferric chloride? You’re a Her Gratious British Majesty’s subject, whereas I’m a citizen form a third world, underdeveloped country, and that makes a big difference Crisi Sao Paulo – Brazil.
Everyone must be made aware for their sake when taking advice from you guys that what adtm say may well be off the mark technically. No statement can be made about resistance of alloys in environments that do not contain chlorides.
Should the clients’ insistence is for 72 hrs duration then: I still think you do not methid it. Please share this page: If testing protocol isn’t the problem I would look at composition and solution treatment for answers. Secondly it confirms to me what I have found out on several mwthod meanwhile. Red Flag This Post Please let us know here why this post is inappropriate.
Crisi Date I mean, as when I hear pure CO2 – for this particular instance – it might eventually cause some issues with carbide formation or precipitation etc? Please put it to better use than to imitate someone who clips talking points as if they were in some sort of psuedo-political campaign, because there are professionals who do that for a living I think Henry owes me an apology. G48 Method A is commonly called out for cast superduplex stainless with a 24 hour test period at 50C and 24hrs.
You may polish the edges, if the finished product is pickled then you can pickle, the times and temps are general guidance.