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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Some standards require the test sample to be aged prior to testing, to simulate the precipitation that might occur during welding. ASTM G28 method B is a more aggressive test than method A and is intended for more corrosion resistant alloys, as listed in the ixo.
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. The exception to this is ASTM G28 method A, where rates for the onset of intergranular corrosion are described in reference 1. SEP also gives guidance on which of its methods apply to which alloys: ISO is the most rigorous in terms of defining test methods, and says which alloys should use which test methods as follows: Hence, it is normally only used for stainless steels intended for nuclear service, or another application involving nitric acid.
R Baboian, Corrosion Tests and Standards: The Tests Table 1 below shows the various methods for four common standards: The most convenient size is often a cylinder 10mm diameter by mm long, but other dimensions are possible to suit particular product forms. Make an Enquiry Notice: Methods B and E are suggested for all grades of series austenitic alloys, while method F is suggested for cast type alloys. Why were these tests designed?
This document also points out which alloys the tests are intended for, and recommends the most appropriate test when none is specified.
ISO is specifically for duplex and all austenitic stainless steels, and recommends ageing at two different temperatures: The specifications for bend testing are shown in Table 4. Where a standard is included in a purchase specification, kso must be followed, although it is advised that unsuitable tests, such as the Huey test for duplex and super austenitic stainless steels, are queried.
Intergranular Corrosion Tests for CRAs
Alternatively, a welded test-piece in the as-welded condition may be tested. 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.
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 36512- are equivalent. It can be seen that some alloys fall into two categories, and kso guidelines are given for selecting the most appropriate. SEP method iiso is a special environment only suitable for the Jso alloys, as described below, in section 4. 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 does not require samples to be heat treated. These tests were introduced when the carbon content in CRAs typically hit 0. 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. 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.
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Some suggested criteria for the listed alloys are shown in Table 2, below. This document describes all three of these tests for four common standards, and describes the differences.