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. Abstract ASTM G48 – “Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride. 1 These test methods are under the jurisdiction of ASTM Committee G01 on. Corrosion Results for ASTM G48 Standard Test Method for Pitting and Crevice.
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No statement can be made about resistance of alloys in environments that do not contain chlorides. Not sure what you need? While the use of hooks requires that a specimen support hole be provided, the hooks, as contrasted to the cradle, are easier to fashion. G 48 — 03 Aastm.
Corrosion Testing to ASTM G48 using Method A – Corrosion engineering – Eng-Tips
NOTE 1—Grinding or pickling on stainless steel surfaces may destroy the passive layer. Ferric Chloride Test Solution 6. The precision of Methods E and F for measuring the pitting and crevice corrosion resistance was determined in an interlaboratory test program with seven laboratories running triplicate tests on 4 materials.
A number in parentheses indicates the year of last reapproval.
Current edition approved May 1, The torque applied to the bolting assembly is 0. Last previous edition approved in as G 48— If you’re forced to pursue the wrost case scenario, then the other option is to use super duplex welding consumables for the weld coupon. Exposure time shall be 24 hours.
All specimens in a test series should have the same dimensions when comparisons are to be made. Record the maximum pit depth on edges if end grain attack is of interest. Otherwise, for wrought it normally would revert to A for testing. Methods A and B are designed to cause the breakdown of Type at room temperature.
If testing requires use of a condenser described belowthe test tube 5.
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Dear experts, The subjected testing asmt performed on Duplex steel for welding procedure qualification at testing temperature of 22C for suggested time period of 72 hours as per ASTM G48 using Method A.
This standard contains six methods, A through F. If someone has a specific procedure that they want reproduced then that is the way it is to be done. Replace asym watch glass on the container. The oil and gas industry has spent a great deal of xstm and effort since the 80s in arriving at a standardised G48 test for duplex. Tall form or Erlenmeyer? Photographs of a sample with mass loss less than 0. Methods E and F are for stainless steels and have a test time of 24 hours. The standard test period is 72 h.
The torque must be reported as indicated in Which asttm do I need? I don’t know any end users who test for 72 hours. Method C — Critical pitting temperature test for nickel-base and chromium-bearing alloys. Specimens may be inspected at intervals by decanting the test solution into a clean beaker and sliding the specimen from the test tube.
Other units are given in parentheses for information only. Methods A and B are designed to cause the breakdown of Type at room temperature.
The results of these tests are given in Table 1. Grinding or pickling on stainless steel surfaces may destroy the passive layer.
Rock Mechanics Symposium and 5th U. Crevice corrosion is considered to astk present if the local attack is 0. Method E — Critical pitting temperature test for stainless steels. Methods C, D, E and F allow for a ranking of alloys by minimum critical temperature to cause initiation of pitting corrosion and crevice corrosion, respectively, of stainless steels, nickel-base and chromium-bearing alloys in a standard ferric chloride solution.
In some cases, the crevice formers may become stained with corrosion products from the tested alloy. The available pitting and crevice testing methods include:. Peer reviewed only Published between: In many ways, G is ideal for use instead of methods C-F as it is a more rapid method that can be performed within days instead of weeks.
When using stainless and duplex steels, ASTM Axtm is widely used to ensure the quality of the material and resistance to pitting and crevice corrosion. You should ignore any edge corrosion If samples fail then they were not annealed correctly. Other units are given in parentheses for information only. Methods C and D are for Ni-based, Cr-bearing alloys and define the test time at 72 hours.
You did not add HCl to the test solution did you? Ultrasonic cleaning may be used in those cases in which it is difficult to remove corrosion products from deep pits or crevices.