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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For many alloys, the onset is at 0. R Baboian, Corrosion Tests and Standards: None of these are identical and cross substitution of results is not possible. 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.
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 was designed for nickel-based alloys, and a list of applicable alloys for methods A and B is in the standard. More suitable alternatives are offered in Table 5, below. Some suggested criteria for the listed alloys are shown in Table 2, below.
ASTM G28 lists alloys and specifies the test exposure for each.
SEP method 3 is a special environment only suitable for the Ni-Mo alloys, as described below, in section 4. The test solutions and exposures for some common intergranular corrosion tests. Make an Enquiry Notice: Good material should have a corrosion rate substantially less than the threshold value. As 15 hours is a difficult test period in practice, and is only a minimum, conducting the test for 20 hours overnight means that the two tests are equivalent.
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: Bend test criteria for several standards.
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. The latter is a German test, but it is often called up in European projects.
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.
This test should be avoided for most CRAs, except in the circumstances described below, in section 4.
All bend tests require a tensile test machine or similar, with suitable grips and sufficient strength to bend ieo strongest alloy. Hence, it is normally only used for stainless steels intended for nuclear service, or another application involving nitric acid.
Just remember that these tests were devised for specific groups of alloys isso should not be applied to all CRAs! This means that carbide formation during welding is highly unlikely, and modern 3561-2 should easily pass one of these tests. SEP does not require ageing, although it might be required in a specification calling up this standard. ISO is specifically for duplex and all austenitic stainless steels, and recommends ageing at two different temperatures:.
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.
Where a standard is isi 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. 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. Both of these tests should be followed by water quenching.
Selection of a 33651-2 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.
It can be seen that some alloys fall into two categories, and iiso guidelines are given for selecting the most appropriate. Why were these tests designed? Where no specific test is specified, Table 5 suggests the most appropriate alongside a second choice, if the first is declined.
It does not say what to do about duplex or super austenitic alloys. Get in Touch Contact us by Phone or Email to find out how we can help your industry.