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 does not require ageing, although it might be required in a specification calling up this standard. 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.
SEP also gives guidance on which of its methods apply to which alloys: The latter is a German test, oso it is often called up in European projects. Both of these tests should be followed by water quenching.
More suitable alternatives are offered in Table 5, below. 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. The 351-2 to this is ASTM G28 method A, 36512 rates for the onset of intergranular corrosion are described in reference 1. 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. These tests were introduced when the carbon content in CRAs typically hit 0. 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. All bend tests require a tensile test machine or similar, with suitable grips and sufficient strength to bend the strongest 3615-2.
ISO is the most rigorous in terms of defining test methods, and says which alloys should use which test methods as follows:.
Intergranular Corrosion Tests for 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. This document also points out which alloys the tests are intended for, and recommends the most appropriate test when none is specified. ISO is the most rigorous in terms of defining test methods, and says which alloys should use which test methods as follows: There are a number of recognised tests when it comes to the intergranular corrosion testing of corrosion resistant alloys CRA.
Just remember that these tests were devised for specific groups of alloys and should not be applied to all CRAs! SEP method 3 is a special environment only suitable for the Ni-Mo alloys, as described below, in section 4. Get in Touch Contact us by Phone or Email to find out how we can help your industry. This means that carbide formation during welding is highly unlikely, and modern CRAs should easily pass one of these tests.
ASTM G28 does not require samples to be heat treated. Make an Enquiry Notice: Bend test criteria for several standards.
Table 1 below shows the various methods for four common standards: It has been used for the duplex stainless steel UNS Swhich has been used for nitric acid cooler tubes. This test should be avoided for most CRAs, except in the circumstances described below, in section 4.
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.
Contact us by Phone or Email to find out how we can help your industry. This document describes all three of these tests for four common standards, and describes the differences. Where a standard is included in a purchase specification, this must be followed, although it is advised 3615-2 unsuitable tests, such as the Huey test for duplex and super austenitic stainless steels, are queried. 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.
ISO is specifically for duplex and all austenitic stainless steels, and recommends ageing at two different temperatures:.
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. The test solutions and exposures for some common intergranular corrosion tests. ASTM G28 lists alloys and specifies the test exposure for each. ASTM A was designed for austenitic isp steels, specifically the series alloys.
The most convenient size is often a cylinder 10mm diameter by mm long, but other dimensions are possible to suit particular product forms. Some suggested criteria for the listed alloys are shown in Table 2, below.
It can be seen that some alloys fall into two categories, and no guidelines are given for selecting the most appropriate. ASTM G28 method B is a more 36651-2 test than method A and is intended for more corrosion resistant kso, as listed in the document. Good material should have a corrosion rate substantially less than the threshold value.
The effect of post weld surface treatments on the corrosion resistance of super duplex stainless steel welds in sea water 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. The Huey test method C is only for molybdenum-free grades, such as L, as alloys jso molybdenum show high rates of attack in this test.