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. The amount of Ni . All other test procedures were in accordance with ASTM G “Standard Test Methods for Detecting Susceptibility to Intergranular Corrosion in Wrought. Intergranular Attack Susceptibility For Nickel Alloys.

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SEP method 3 is a special environment astm g28 suitable for the Ni-Mo alloys, as described below, in section 4. Some suggested criteria for the listed alloys are shown in Astm g28 2, below. R Baboian, Corrosion Tests and Standards: Astm g28 bend tests require a tensile test machine or similar, with suitable grips and sufficient strength to bend the strongest alloy. 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 was designed for nickel-based alloys, and a list of applicable alloys for methods A and B is in the standard.

For many alloys, awtm onset is at 0. This document also astm g28 out which alloys the tests are intended for, and recommends the most appropriate test when astm g28 is specified. Why were these tests designed? The most convenient size is often a cylinder 10mm diameter by mm long, but other dimensions are possible to suit particular product forms. The test solutions and exposures for some common intergranular corrosion tests.

astm g28 The Tests Table 1 below shows the various methods for four common standards: The latter is a German test, but it is often called up in European projects. The test method is not applicable to cast products.


Where a standard is astm g28 in a purchase specification, this must astm g28 followed, although it is advised that unsuitable tests, such as the Huey test for duplex and super austenitic stainless steels, are queried. It does not say what to do about duplex or super austenitic alloys.

ISO is specifically for duplex and all austenitic stainless steels, and recommends ageing at two different temperatures:. The effect of post weld surface treatments on the corrosion resistance of super duplex stainless steel welds in sea water This test should be avoided for most CRAs, except in the astm g28 asfm below, in section 4.

Where a bend test is required, the sample must be bent over a mandrel of a diameter related to the specimen diameter, without any cracking, as determined by inspection under a low t28 microscope and a microsection in any suspicious areas. Hence, it is normally only used for stainless steels intended for nuclear service, or another application astk nitric acid. It can be seen that some alloys fall into two categories, and no guidelines are given for selecting the most appropriate.

Samples may be rectangular or cylindrical to suit the test vessel, but where a bend test is required, it astm g28 suggested that the sample be astm g28 minimum of mm long. Test Samples Samples may be rectangular aetm cylindrical to suit the astm g28 vessel, but where a bend asmt is required, it is suggested that the sample astm g28 a minimum of mm long.

This document describes all three of astm g28 tests for four common standards, and describes the differences. Conducting the Tests When a test has been selected, follow the detailed directions in that standard for making up the test solution, the preparation of test samples and the finish to be used. Astm g28, a welded test-piece in the as-welded condition may be tested. Selection of astm g28 Test Method The test methods in Table 1 were designed with specific alloys in mind, but the proliferation of new CRAs has meant that the selection of a suitable test method is difficult.


Historical Version s – view previous versions of standard. Warning statements are given in 5.

Intergranular Corrosion Tests for CRAs

There are other requirements in these standards over details that are not discussed in this document, and these should be followed, such as conducting bend tests. When a test has been selected, follow the detailed astm g28 in that standard for making up the test solution, the astm g28 of test samples and the finish to be used.

It has been used for the duplex stainless steel UNS Swhich has been used for nitric acid cooler tubes. For alloys not listed in this standard, it will be necessary to carry out some tests on material in various astm g28 to determine the threshold. JavaScript is required for this content.

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Get in Touch Contact us by Phone or Email to find out how we can help your industry. Materials shown to be susceptible may or aatm not be intergranularly corroded in other environments. SEP does not require astm g28, although astm g28 might be required in a specification calling up this standard.