This means that carbide formation during welding is highly unlikely, and modern CRAs should easily pass one of these tests. These test should, in no case, be considered as an absolute criterion of the quality of the metal. You can buy this standard from any national standardization body.. 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.
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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.
It constitutes a basis for estimating the resistance to intergranular corrosion but may not be used to check resistance to other forms of corrosion general corrosion, pitting, stress corrosion, etc. 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.
This part of ISO specifies methods for the determination of the resistance to intergranular corrosion of ferritic, austenitic and ferritic-austenitic duplex stainless steels in media containing sulfuric acid.
Some standards require the test sample to be aged prior to testing, to simulate the precipitation that sio occur during welding.
Table 1 below shows the various methods for four common standards: It is necessary for the user to adapt the specified corrosion test to the use which will be made of the alloy.
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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. The test solutions and exposures for some common intergranular corrosion tests.
GSO ISO - Standards Store - GCC Standardization Organization
ASTM G28 lists alloys and specifies the test exposure for each. ASTM G28 was designed for nickel-based alloys, and a list of applicable alloys for methods A and B is in the standard. Just remember that these tests were devised for specific groups of alloys and should not be applied to all CRAs! Good material should have a corrosion rate substantially less than the threshold value. 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.
All bend tests require a tensile test machine or similar, with suitable grips and sufficient strength to bend the strongest alloy.
Alternatively, isk welded test-piece in the as-welded condition may be tested. Get in Touch Contact us by Phone or Email to find out how we can help your industry.
Ministry of Commerce and Industry. This means that carbide formation during welding is highly unlikely, and modern CRAs should easily pass one of these tests. It does not say what to do about duplex or super austenitic alloys.
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. This test should be avoided for most CRAs, except in the circumstances described below, in section 4. Construction and Building Sector.
Hence, it is normally only used for stainless steels intended for nuclear service, or another application involving nitric acid. It also specifies the purposes which may be assigned to the test. Methods B and E are suggested for all grades of series austenitic alloys, uso method F is suggested for cast type alloys. SEP does not require ageing, although it might be required in a specification calling up this standard.
Intergranular Corrosion Tests for CRAs
ISO is specifically for duplex and all austenitic stainless steels, 351-2 recommends ageing at two different temperatures:. Some suggested criteria for the listed alloys are shown in Table 2, below. The test methods included are: Saudi Standards, Metrology and Quality Organization.