ABSTRACT It is common practice to perform intergranular corrosion testing in accordance with ASTM (1) G28 on solid solution nickel alloys, e.g. UNS N . Alloy 22 is a Ni-Cr-Mo alloy (Nickel-Chromium-Molybdenum) and is one of the most versatile corrosion resistant alloys used in industry today. Intergranular Attack Susceptibility For Nickel Alloys.

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It is common practice to perform intergranular corrosion testing in accordance with ASTM 1 G28 on solid solution nickel alloys, e. NOTICE When migrating the old forums over to our new forums we were unable to retain the identity of the authors, so the old adtm will show up as “anonymous”.

It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

The test methods in Table 1 were t28 with specific alloys in mind, but the proliferation of new CRAs asfm meant that the selection of a suitable test method is difficult.

The test method is not applicable to cast products. It has been used for the duplex stainless steel UNS Swhich has been used for nitric acid cooler tubes.

The safe operation of oil refineries aatm the United States is under constant r The Huey test method C is only for molybdenum-free grades, such as L, as alloys with molybdenum show high rates of attack in this test.

ASTM G28 test

ISO is specifically for duplex and all austenitic stainless steels, and recommends ageing at two different temperatures: Make an Enquiry Notice: However, there are necessarily limitations in the potential applicability of standard tests because the zstm of corrosion in the service environment may be different than that targeted in the standard test, due to the difference between the actual service environment and the test solution.

The effect of post weld surface treatments on the corrosion resistance of super duplex stainless steel welds in sea water The most convenient size is often a cylinder 10mm diameter by mm long, but other dimensions are possible to suit particular product forms.


Thanks for your answer. Astj search Show search help. The problem is that the sample was destroyed just six hours, including the test that is annealed solution.

Discussion Forums – The Hendrix Group. Historical Version s – view previous versions of standard.

Referenced Documents purchase separately The documents xstm below are referenced within the subject standard but are not provided as part of the standard. Rock Mechanics Symposium and 5th U. Warning statements are given in 5. January 30, – February 2, Where: SEP also gives guidance on which of its methods apply to which alloys: Get in Touch Contact us by Phone or Email to find out how we can help your industry.

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This means that carbide formation during welding is highly unlikely, and modern CRAs should easily pass one of these tests. Both of these tests should be followed by water quenching. These tests were introduced when the carbon content in CRAs typically hit 0.

Proceedings of an international conference Subsea Controls and Data Acquisition ‘ The Tests Table 1 below shows the various methods for four common standards: For an alloy that is not listed, look for an alloy with a similar composition to a listed alloy to determine the most suitable test. The latter is a German test, but it is often called up in European projects. When migrating the old forums over to our new forums we were unable to retain the identity of the authors, so the old posts will show up as “anonymous”.

In the case of nickel-rich, chromium-bearing alloys, the test method may be applied to wrought and weldments of products.

ISO is the most rigorous in terms of defining test methods, and says which alloys should use which test methods as follows:. Someone would have experience in this matter. Why were these tests designed?

Intergranular Attack Testing – ASTM G28 – Colorado-Metallurgical-Services

About us Contact us Help Terms of use. ASTM G28 method B is a more aggressive test than method A and is intended for more corrosion resistant alloys, as listed asgm the document.


Just remember that these tests were devised for specific groups of alloys and should not be applied to all CRAs! For alloys not listed in this standard, it will be necessary to carry out some tests on material in various conditions to determine the threshold. ASTM G28 lists alloys and specifies the test exposure for each. Some standards require the test sample to be aged prior to testing, to simulate the precipitation that might occur during welding.

Where no specific test is specified, Table 5 suggests the most appropriate alongside a second choice, if the first is declined. These regions will exhibit a lower resistance to the initiation of corrosion in the ASTM tests, and this is where the intergranular corrosion begins. There are a number of recognised tests when it comes to the intergranular corrosion testing of corrosion resistant alloys CRA.

So please participate and share knowledge just as you have in the past.

ISO is specifically for duplex and all austenitic stainless steels, and recommends ageing at two different temperatures:. ASTM A was designed for austenitic stainless steels, specifically the series alloys.

Page 1 of 1. The exception to this is ASTM G28 method A, where rates for the onset of intergranular corrosion are described in reference 1. Alternatively, a welded test-piece in the as-welded condition may be tested. The awtm of such tests are applied widely as acceptance tests for parent and welded materials, and as such are essentially used to confirm the suitability of these materials for service.

Conducting the Tests When a test has been selected, follow the detailed directions in that standard for making up the asmt solution, the preparation of test samples and the finish to be used. Proceedings of an International Conference Submersible Technology: This document describes all three of these tests for four common standards, and describes the differences.