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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Red Flag This Post Please let us know here why this post is inappropriate. The testing temperature will be selected based on the material that is under test. The sample was pickled and prepared but still could not meet the client requirements no pitting or crevice corrosion in either weld metal or HAZ is permitted and failed in testing twice. Click Here to join Eng-Tips and talk with other members!
Please advise, is it acceptable if we may submit TQ to client to 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.
Otherwise, for wrought it normally would revert to A for testing. G48 is looking to determine the resistance to the initiation of chloride pitting. Samples shall not be pickled or passivated prior to test. Grinding or pickling on stainless steel surfaces may destroy the passive layer.
Yet you still have this notion that I’ disagree with ytour conclusion and I do not understand why??? The crevice former contact area of Method B is a Other units are given in parentheses for information only. Which test do I need? Furthermore did you notice the presence of pits scattered on the entire surface of specimens aztm they are localized for example in the HAZ region?
ASTM G48 Method A-Corrosive Testing #4
This is a simple immersion test where the test sample is placed in a temperature-controlled solution of FeCl 3. There are several factors that can influence the selection of methods; we can help you with this part of the process methov well. The recommended test time is 72 hours. Are you working with a cast duplex product?
Log in to your subscription Username. I offer an olive branch, and instead of starting anew in the spirit of MUTUAL RESPECT, You continue with your unfortunate display of arrogance, and just plain outright nastiness that is unacceptable regardless of your title, position, or any other so-called entitlement which may have been granted to you in other forums, but ,ethod totally unacceptable as well as irrelevant in axtm one! In a previous post that has since been locked, I stated that I had also sent an email to Metrode, concerning the corrosive testing of duplex and super duplex filler wires, or as welded metal according to G48!
Nanjing, I have to separate my reply to you into two different parts. By js55 Date What exactly is it? ASTM G 48 is a relatively severe test, but lack of definition in the standard can lead to variation of data. You may polish the edges, if the finished product is pickled then you can pickle, the times and temps are general guidance.
Crisi Sao Paulo – Brazil. It is, like it is.
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All sample surfaces must be freshly ground with no further treatment. Thank you for helping keep Eng-Tips Forums free from inappropriate posts. Such issues are the result of project complexity, size, uniqueness and regulation, as well as the need for virtual team collaboration. Go to this Youtube link and see some Anderson Sylva knockouts!
Method B — Ferric chloride crevice test. This should indicate if you have any intermetallic phases present. I only know that I know nothing. Consequently, the degree of corrosion damage that occurs during testing will generally be greater than that in natural environments in any similar time period.
Don’t play mix and match with test conditions and procedures. Welding consumable manufacturer does not recommend it” Will it be ok?
ASTM G48 METHOD A PDF
I have a friend that is b48 engineer from Brazil. Henry, do not try and worm your way methov of this one. And it just goes on, and on, ast, on, and on Client is not accepting the results and require to perform the testing to G48 Method A for 72 hours. The valuable technical information you did provide: Unfortunately, if the client wants a 72 hour test, that is their prerogative. This standard contains six methods, A through F.
We’ll be the World Champions for the 6th time. 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. Pretty quick Reply I thought! Other units are given in parentheses for information only. 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.
Rodofgod posted Metrode’s recommendations which backed up everything I have said and what is your response? Namely, that flux cored wires can show sometimes quite different behaviour in both welding- and g84 aspects compared to solid wires. Methods D and F use a multiple crevice assembly which has a number of grooves and plateaus and is attached to the test f48 with an insulated bolt.
They use similar test solutions but they are done for very different reasons. Then after cutting you should pickle the sample. Where you cut a sample and grind the surfaces, no pickle or passivation allowed, and test in ferric chloride? It means that the recommendations are just that – Nothing less as well as Nothing more ,so I would appreciate it that you would NOT add words that clearly I did not write at all, because when you do so, you only start another round of confusion and mis-communication Crisi Date