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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This should indicate if you have any intermetallic phases present. G48 is looking to determine the resistance to the initiation of chloride pitting. Like what you saw? Samples shall not be pickled or passivated prior to test. Eventually in the ‘Metallurgy’ section? Where you cut a sample and grind the surfaces, no pickle or passivation allowed, and test in ferric chloride? Link to Active This link will always route to the current Active version of the standard.
Exposure time shall be 24 hours. Giovanni, thank you for your response! G48 Method A is commonly called out for cast superduplex stainless with a 24 hour test period at 50C and 24hrs. Nebraska – Section Or at least do micros. The G48 test is designed to assess materials for pitting corrosion resistance in chloride media stress is not relevant. 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.
Crisi’s original letter to metrode with minor modifications to grammar etc! As to this being only “recommendations and not cast in stone”. 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.
Corrosion Testing to ASTM G48 using Method A – Corrosion engineering – Eng-Tips
Are you an Engineering professional? Rock Mechanics Symposium and 5th U. Or at least do micros. Puget Sound Olympic – Section Champion horse jockey here is from Brazil. Methods C, D, E and F allow for a ranking of alloys by minimum critical temperature to metbod initiation of pitting corrosion and crevice corrosion, respectively, of stainless steels, nickel-base and chromium-bearing alloys in a standard ferric chloride solution.
Method E — Critical pitting temperature test for stainless merhod. Which one do you need?
On the plus side I have really appreciated some of the links you have provided and hope you continue to provide these. Method B — Ferric chloride crevice test. Your disagreement with my viewpoint: I also note your good friend the “highly esteemed Doctor Crisi” has disappeared from this issue after his glaring faux pas. There may have been a time when Brazil was a third world country, but with all that’s transpired in the last decade there, they are becoming a clear 1st world country, while the old guard first world countries are regressing to 2nd and 3rd.
Otherwise, for wrought it normally would revert to A for testing. Why thank you Billy!!!
Don’t play mix and match with test conditions and procedures. We’ll be the World Champions for the 6th time. Rodofgod posted Metrode’s recommendations which backed up everything I have said and what is your response? 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.
Three days later, I received this reply not in full as that would be against the laws of the landbut the main body of the response: Florida West Coast – Section Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Grinding or pickling on stainless steel surfaces may destroy the passive layer. Furthermore did you notice the presence of pits scattered on the entire surface of specimens or they are localized for example in the HAZ region? 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.
Merry Christmas Henry, Stephan.
Hi Syed, Passing G48A test is always a challenge to welding engineers. Respectfully, Henry Bill, H48 really unfortunate that your attitude, tone of message, total lack professionalism continues to describe you as accurate as ever!!!
Henry, do not try and worm your way methov of this one. Therefore, grinding and pickling of the specimen will mean that metbod results may not be representative of the conditions of the actual piece from which the sample was taken. Not sure what you need? Ed, The issue is not confused. A good suggestion earlier is to test the base metal this will demonstrate if you have any chance of passing.
By the way, I do not think that Brazil ranks in the top of the worlds ‘third world countries’, in fact I thought it was the richest nation in South America? C tests at that temperature is clear that the microstructure have been affected. ASTM G 48 is a relatively severe test, but lack of definition in the standard can lead to variation of data. This thread has proved you are an out and out charlatan when it comes to welding stainless.
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Henry, so well said — truly noble! Unfortunately, if the client wants a 72 hour test, that is their prerogative. Powered by mwForum 2.