Find the most up-to-date version of ISO at Engineering ISOpdf – Download as PDF File .pdf) or read online. ASTM A method E is sometimes called the Strauss test, and is the same as ISO method A, except for the duration. As 15 hours is a difficult test period .

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Alternatively, a welded test-piece in the as-welded condition may be tested. The Tests Table 1 below shows the various methods for four common standards: Bend test criteria for several standards.

Table 1 below shows the various methods for four common standards: Just remember that these tests were devised for specific groups of alloys and should not be applied to all CRAs! Isl is the most rigorous in terms of defining test methods, and says which alloys should use which test methods as isi It does not say what to do about duplex or iwo austenitic alloys.

The test solutions and exposures for some common intergranular corrosion tests. Where no specific test is specified, Table 5 suggests the most appropriate alongside a second choice, if the first is declined. 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. ISO is specifically for duplex and all austenitic stainless steels, and recommends ageing at two different temperatures:.

Where a standard is included in a purchase specification, this must be followed, although it is advised that unsuitable tests, such as the Huey test for duplex and super austenitic stainless steels, are queried. Make an Enquiry Notice: R Baboian, Corrosion Tests and Standards: ASTM G28 lists alloys and specifies the test exposure for each. ASTM G28 does not require samples to be heat treated.

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This document describes all three of these tests for four common standards, and describes the differences. 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 Suggested test methods for different corrosion resistant alloys.

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Samples may be rectangular or cylindrical to suit the test vessel, but where a bend test is required, it is suggested that the sample be a minimum of mm long. 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 36511-2 power microscope and a microsection in any suspicious areas. More suitable alternatives are offered in Table 5, below.

The izo for bend testing are shown in Table 4. The latter is a German test, but it is often called up in European projects.

Intergranular Corrosion Tests for CRAs

Test Samples Samples may be rectangular or cylindrical to suit the test vessel, but where a bend test is required, it is suggested that the sample be a minimum of mm long. This means that carbide formation during welding is highly unlikely, and modern CRAs should easily pass one of these 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. 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.

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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. 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.

This test should be avoided for most CRAs, except in the circumstances described below, in section 4. Why were these tests designed? SEP method 3 is a special environment only suitable for the Ni-Mo alloys, as described below, in section 4. Get in Touch Contact us by Phone or Email to find out how we can help your industry. None of these are identical and cross substitution of results is not possible. Some suggested criteria for the listed alloys are shown in Table 2, below.

ISO is the most rigorous in terms of defining test methods, and says which alloys should use which test methods as follows:. JavaScript is required for this content.

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These tests were introduced when the carbon content in CRAs typically hit 0. Methods B and E are suggested for all grades of series austenitic alloys, while method F is suggested for cast type alloys. It can ixo seen that some alloys fall into two categories, and no guidelines are given for selecting the most appropriate.