ASTM G48 – Download as PDF File .pdf), Text File .txt) or read online. Fig. 2 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 . The ASTM GA test (ferric chloride test) is widely used for pre-qualification of corrosion resistant alloys, welds and weld overlays for oil and gas industry.
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Log in to your subscription Username. In many ways, G is ideal for use instead of methods C-F as it is a more rapid method that can be performed astn days instead of weeks. Are you working with a cast duplex product? This test method astm g48 not determine the critical pitting temperature or test for the suitability for use in astm g48 particular environment.
Close this window and log in. Grinding or pickling on stainless steel surfaces may destroy the passive layer. The astm g48 crevice tests, Methods B, D and F, vary in crevice-former contact area and crevice gap thickness.
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Therefore, grinding astm g48 pickling of the specimen will mean that the results may not be representative of the conditions of the actual piece astm g48 which the sample was taken. 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. The FeCl 3 solution provides an aggressive environment to promote localized corrosion due to the presence of chloride ions, oxidizing conditions, and low pH.
The results may astm g48 used for ranking alloys in order of increasing resistance to pitting and astm g48 corrosion initiation under the specific conditions of these methods.
Testing by ASTM G48 for Pitting and Crevice Corrosion
Thank you for helping keep Eng-Tips Astm g48 free from inappropriate posts. You did not add HCl to the test solution did you? Contact our corrosion experts today!
There are 6 Methods: This test method is designed solely for detection of the precipitation of detrimental intermetallic phases astm g48 duplex stainless steels. Secondly, have you done an A test? You astm g48 ignore any edge corrosion If samples fail then they were not annealed correctly. G48 A method is designed to determine the relative pitting resistance of stainless steels and h48, chromium bearing alloys.
The purpose of A is to detect intermetallic phases.
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Referenced Documents purchase separately The t48 listed below are referenced astm g48 the subject standard but are not provided as part of the standard.
Other Resources Looking for more? Which test do I need? Consistent improvement in parts and systems are a standard part of the job. Register now astm g48 it’s still free!
There are several factors that can influence the selection of methods; we can help you with this part of the astm g48 as well. Dear experts, The subjected testing was performed on Duplex steel for welding procedure qualification at testing temperature of 22C for astm g48 time period of 72 hours as per ASTM G48 using Method A.
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The product is wrought duplex but testing to G48 using Method A is client specification requirement for g8 procedure qualification at 22C for suggested 72 hours. The recommended test time is 72 hours. When testing as-welded, cylindrical, or other non-flat samples, the standard crevice formers will not provide g488 contact.
The crevice former contact area astm g48 Method B is astm g48 ASTM G 48 is a relatively severe test, astm g48 lack of definition in the standard can lead to variation of data. Proceedings of an international conference Subsea Controls and Data Acquisition ‘ Furthermore did you notice the presence of pits scattered on the astm g48 surface of specimens or they are localized for example in the HAZ region?
Client is not accepting the results and astm g48 to perform the testing to G48 Method A for 72 hours. Method A — Ferric chloride pitting test. Is ashm pipe pickled? Join your peers on the Internet’s largest technical engineering professional community.
Which one do aastm need? Like what you saw? Otherwise, for wrought it normally would revert to A for testing. Where you cut a sample and grind the surfaces, no pickle or passivation allowed, and test in ferric chloride?
Pradip, and All Don’t confuse G48 and A Red Flag Astm g48 Post Please let us know here why this post is inappropriate. Proceedings of an International Conference Submersible Technology: Methods E and F are for stainless steels and have a test time of 24 hours.