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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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. ISO is the most rigorous in terms of defining test methods, and says which alloys should use which test methods as follows:.
This means that carbide formation during welding is highly unlikely, and modern CRAs should easily pass one of these tests. Hence, it is normally only used for stainless steels intended for nuclear service, or another application involving nitric acid.
Selection of a 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.
Get in Touch Contact us by Phone or Email to find out how we can help your industry. ASTM A was io for austenitic stainless steels, specifically the series alloys. SEP method 3 is a special environment only suitable for the Ni-Mo alloys, as described below, in section 4.
The specifications for bend testing are shown in Table 4. ISO is specifically for duplex and all austenitic stainless oso, and recommends ageing at two different temperatures: 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 power microscope and a microsection in any suspicious areas.
For alloys not listed in this standard, it will be necessary to carry out some tests on material in various conditions to determine the 3651.
Intergranular Corrosion Tests for CRAs
The exception to this is ASTM G28 method A, where rates for the onset of intergranular corrosion are described in reference 1. Make an Enquiry Notice: The latter is a German test, but it is often called up in European projects. Just remember that these tests were devised for specific groups of alloys and should not be applied to all CRAs!
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. Good material should have a corrosion rate substantially less than the threshold value. 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:.
Some suggested criteria for the listed alloys are shown in Table 2, below.
ASTM G28 was designed for nickel-based alloys, and a list of applicable alloys for methods A and B is in the standard.
Suggested test methods for different corrosion resistant alloys. These tests were introduced when the carbon content in CRAs typically hit 0. There are a number of recognised tests when 3561-2 comes to the intergranular corrosion testing of corrosion resistant alloys CRA. Contact us by Phone or Email to find out how we can help your industry.
The most convenient size is often a cylinder 10mm diameter by mm long, but other dimensions are possible to suit particular product forms. SEP does not kso ageing, although it might be required in a specification calling up this standard.
Bend test criteria for several standards. 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.
There are other requirements in these standards over details that are not discussed in this document, and these should be followed, iwo as conducting bend tests. This test should be avoided for most Sio, except in the circumstances described below, in section 4. Alternatively, a welded test-piece in the as-welded condition may be tested. Why were these tests designed? The test methods in Table 1 were designed with specific alloys in mind, 3651–2 the proliferation of new CRAs has meant that the selection of a suitable test method is difficult.
Where no specific test is specified, Table 5 suggests the most appropriate alongside a second choice, if the first is declined. Samples may be rectangular or cylindrical to 36551-2 the test vessel, but where a bend test is required, it is suggested that the sample be a minimum of mm long.
It has been used for the duplex stainless steel UNS Swhich has been used for nitric acid cooler tubes. ASTM G28 method B is a more aggressive test than method A and is intended for more corrosion resistant alloys, as listed in the document.