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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ASTM G28 method B is a more aggressive test than method A and is intended for more corrosion resistant alloys, as listed een the document. The test methods in Table sio were designed with specific alloys in iwo, but the proliferation of new CRAs has meant that the selection of a suitable test method is difficult.
The Tests Table 1 below shows the various methods for four common standards: Bend test criteria for several standards. 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.
Suggested test methods for different corrosion resistant alloys. ASTM A ne designed for austenitic stainless steels, specifically the series alloys. The specifications for bend testing are shown in Table 4.
Determination de la resistance a la corrosion intergranulaire des aciers inoxydables. SEP method 3 is a special environment only suitable for the Ni-Mo alloys, as described below, in section 4.
The most convenient size is often a cylinder 10mm diameter by mm long, but other dimensions are possible to suit particular product forms. You may experience issues viewing this site in Internet Explorer 9, 10 or Just remember that these tests were devised for specific groups of alloys and should not be applied to all CRAs!
Accept and continue Learn more about the cookies we use and how to change your settings. 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. Some standards require the test sample to be aged prior to testing, to simulate the precipitation that might occur during welding.
This document also points out which alloys the tests are intended for, and recommends the most appropriate test when none is specified. Worldwide Standards We can source any standard from anywhere in the world.
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. Learn more about the cookies we use and how to change your settings.
It does not say what to do about duplex or super austenitic alloys. There are a number of recognised tests when it comes to the intergranular corrosion testing of corrosion resistant alloys CRA. Alternatively, a welded test-piece in the as-welded condition may be tested. 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.
Take the smart route to manage medical device compliance. 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.
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. This website is best viewed with browser version of up to Microsoft Internet Explorer 8 or Firefox 3.
Both of these tests should be followed by water quenching.
Intergranular Corrosion Tests for CRAs
Ferritic, austenitic and ferritic-austenitic duplex stainless steels. 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. It can be seen that some alloys fall into two categories, and no guidelines are given for selecting the most appropriate.
Nichtrostende ferritische, austenitische und ferritisch-austenitische Duplex- Staehle Korrosionsversuch in schwefelsaeurehaltigen Medien. This test should be avoided for most CRAs, except in the circumstances described below, in section 4. Get in Touch Contact us by Phone or Email to find out how we can help your industry. SEP does not require ageing, although it might be required in a specification calling up this standard.
You may find similar items within these categories by selecting from the choices below:. This means that carbide formation during welding is highly unlikely, and modern CRAs should easily pass one of these tests. Good material should have a corrosion rate substantially less than the threshold value.
ISO is the most rigorous in terms of defining test methods, and says which alloys should use which test methods as follows:. Methods B and E are suggested for all grades of series austenitic alloys, while method F is suggested for cast type alloys.