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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The Tests Table 1 below shows the various methods for four common standards: Table 1 below shows the various methods for four common standards: ASTM Oso was designed for austenitic stainless steels, specifically the series alloys. R Baboian, Corrosion Tests and Standards: ISO is the most rigorous in terms of defining test methods, and says which alloys should use which test methods as follows:.
ISO is specifically for duplex and all austenitic stainless steels, and recommends ageing at two different temperatures: 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 isso and super austenitic stainless steels, are queried.
This test 361-2 be avoided for most CRAs, except in the circumstances described below, in section 4. This means that carbide formation during iwo is highly unlikely, and modern CRAs should easily pass one of these tests. The test solutions and exposures for some common intergranular corrosion tests. SEP does not require ageing, although it might be required in a 3615-2 calling up this standard. Hence, it is normally only used for stainless steels intended for nuclear service, or another application involving nitric acid.
Contact us by Phone or Email to find out how we can help your industry. 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.
Where a bend test is required, the sample must be bent over a mandrel of a diameter related 361-2 the specimen diameter, without any cracking, as determined by inspection under a low power microscope and a microsection in any suspicious areas. Some suggested criteria for the listed alloys are shown in Table 2, below. Just remember that these tests were devised for specific groups of alloys and should not be applied to all CRAs! Why were these tests designed?
The specifications for bend ido are shown in Table 4. None of these are identical and cross substitution of results is not possible. The effect of post weld surface treatments on the corrosion resistance of super duplex stainless steel welds in 3651–2 water 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.
The exception to this is ASTM G28 method A, where rates for the onset of intergranular corrosion are described in reference 1. Where no specific test is specified, Table 5 suggests the most appropriate alongside a second choice, if the first is declined.
Intergranular Corrosion Tests for CRAs
It can be seen that some alloys fall into two categories, and no guidelines are given for selecting the most appropriate. These tests were introduced when the carbon content in CRAs typically hit 0.
Make an Enquiry Notice: Suggested test methods for different corrosion resistant alloys. The test methods in Table 1 iiso designed with specific sio in mind, but the proliferation of new CRAs has meant that the selection of a suitable test method is difficult. For alloys not listed in this standard, it will be necessary to carry out some tests on material in various conditions to determine the jso. For many alloys, the onset is at 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.
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. Bend test criteria for several standards. ISO is specifically for duplex and all austenitic stainless steels, and recommends ageing at two different temperatures:. 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.
SEP also gives guidance on which of its methods apply to which alloys: Both of these tests should be followed by water quenching. ISO is the most rigorous in terms of defining test methods, and says which alloys should use which test methods as follows: Alternatively, a welded test-piece in the as-welded condition may be tested. Methods B and E are suggested for all grades of series austenitic alloys, while method F is suggested for cast type alloys.
Good material should have a corrosion rate substantially less than 365-12 threshold value. Selection of a Test Method The test methods in Table 1 were designed with isl alloys in mind, but the proliferation of new CRAs has meant that the selection of a suitable test method is difficult. 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.
ASTM G28 was designed for nickel-based alloys, and a list of applicable alloys for methods 6351-2 and B is in the standard. 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 kso samples and the finish 6351-2 be used.
ASTM G28 lists alloys 3651- specifies the test exposure for each. Get in Touch Contact us by Phone or Email to find out how we can help your industry.
The latter is a German test, but it is often called up in European projects. It does not say what to do about duplex or super austenitic alloys. ASTM G28 does not require samples to be heat treated.