ISO 3651-2 PDF
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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SEP method 3 is a special environment only suitable for the Ni-Mo alloys, as described below, in section 4. None of these are identical and cross substitution of results is not possible. The exception to this is ASTM G28 method A, where rates for the onset of intergranular corrosion are described in reference 1. ASTM A was designed for austenitic stainless steels, ixo the series alloys. ASTM G28 lists alloys and specifies the test exposure for each.
Good material should have a corrosion rate substantially less than the threshold value. 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. SEP does not require ageing, although it might be required in a specification calling up this standard. It can be seen that some alloys fall into two categories, and no guidelines are given for selecting the most appropriate. All bend tests require a tensile test machine or similar, with suitable grips and sufficient strength to bend the strongest alloy.
More suitable alternatives are offered in Table 5, below. This test should be avoided for most CRAs, except in the circumstances described below, in section 4. 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.
It does not say what to do about duplex or super austenitic alloys. This document also points out which alloys the tests are intended for, and recommends the most appropriate test when none is specified. 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. Get in Touch Contact us by Phone or Email to find out how we can help your industry.
Alternatively, a welded test-piece in the as-welded condition may be tested.
These tests were introduced when the carbon content in CRAs typically hit 0. This means ixo carbide formation during welding is highly unlikely, and modern CRAs should easily pass one of these tests. Make an Enquiry Notice: Hence, it is normally only used for stainless steels intended for nuclear service, or another application involving nitric acid.
Suggested test methods for different corrosion resistant alloys.
It has been used for the duplex stainless steel UNS Swhich has been used for nitric acid cooler tubes. 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.
Just remember that these tests were devised 365-2 specific groups of alloys and should not be applied to all CRAs! Bend test criteria for several standards. Contact us by Phone or Email 36651-2 find out how we can help your lso. ISO is specifically for duplex and all austenitic stainless steels, and recommends ageing at two different temperatures: 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 36512 duplex stainless steel welds in sea water Where no specific test is specified, Table 5 suggests the most appropriate alongside a second choice, if the first is declined.
Table 1 below shows the various methods for four common standards: 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.
Intergranular Corrosion Tests for CRAs
When a test has been selected, follow the detailed directions in that standard for making up the test solution, 36651-2 preparation of test samples and the finish to be used.
ASTM G28 does iwo require samples to be heat treated. 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.
ISO is the most rigorous in terms of defining test methods, and says which alloys should use which test methods as follows: Why were these tests designed? This document describes all three of these tests for four common standards, and describes the differences.
The test solutions and exposures for some common intergranular corrosion tests. R Baboian, Corrosion Tests and Standards: SEP also gives guidance on which of its methods apply to which alloys: The most convenient size is often a cylinder 10mm diameter by mm long, but other dimensions are possible to suit particular product forms. 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.