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. 24 Dec “The test temperatures given in the ASTM G48 standard are only recommendations, and the required test temperature will be given in the.
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I atsm disagree with it being the end of the story, since your true nature is only beginning to be revealed in here All surfaces shall be exposed. Which test do I need? You will see the planet freeze over before I apologize to you for something that is g448 a fact, and has been proven time and again in the first thread as well as in threads which continue to show you exhibiting such weird behavior Grow up or go away. I feel concern that young engineers will take on board advice from people who are considered well versed in welding purely because they write a lot of posts.
G48 A method is designed to determine the relative pitting resistance of stainless steels and nickel-base, chromium bearing alloys. It is refered to as cage fighting due to the fact that they fight in an octagonal chain link “cage” as can be seen in the web sites below. Please share this page: Not sure what you methdo You have did nothing but back-peddle on this issue ever since and try and deflect issues towards my aggressive nature.
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. For some reason or reasons they consider important, Nordic has introduced some changes into the original ASTM specification and they state clearly that their materials are tested according to that revised spec.
The valuable technical information you did provide: Grinding or pickling on stainless steel surfaces g448 destroy the passive layer.
Are you working with a cast duplex product? The G48 test is designed to assess materials for pitting corrosion resistance in chloride media stress is not relevant. Promoting, selling, recruiting, coursework and thesis posting is forbidden. By js55 Date You did not add HCl to the test solution did aztm Your disagreement with my viewpoint: Sheriff’s Encyclopedic Dictionary of Applied Geophysics, fourth edition.
First of all, if you were using scidified ferric chloride it was method C. Method C — Critical pitting temperature test for nickel-base and chromium-bearing alloys.
Unwelded base material or solution annealed welds will pass the test at higher temperatures.
San Francisco – Section 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, astn E and F are for stainless alloys.
We’ll be the World Champions for the 6th time. Exposure time shall be 24 hours. You should ignore any edge corrosion If samples fail then they were not annealed correctly. Consequently, the degree of corrosion damage that occurs during testing will generally be greater than that in natural environments in any similar time period.
Powered by mwForum 2. However, the G48 test is meant for ranking or qualification, and not as designed for determining a corrosion rate over time. Locked and done with already!!!
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The oil mefhod gas industry has spent a great deal of time and effort since the 80s in arriving at a standardised G48 test for duplex. Are the specimens with or without PWHT?
I hope for everyone’s sake that you finally got it all out of your system already Billy!
Few production environments have the luxury of ordering new equipment to replace existing machines on their shop floor. There are several factors that can influence the selection of methods; we can help you with this part of the process as well.
There is not one single test that will accomplish both.
ASTM G48 Method A-Corrosive Testing #4
G48 Method A is commonly called out for cast superduplex stainless with a 24 hour test period at 50C g448 24hrs. As a welder, I take that as a resounding compliment!!! The crevice former contact area of Method B is a Crisi Date