ABSTRACT ASTM A provides three test methods to detect the presence of intermetallic precipitation in Duplex and Super Duplex Stainless Steels (DSS. ASTM A provides three methods/practices to determine the extent of intermetallic precipitation in Duplex Stainless Steels. While Practice A. manual Point Count) and ASTM A (Standard Test Methods for Detecting various tests which were carried out were ASTM A Test Method A, B and C .
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It is informational only asgm not an official part of the standard; the full text of the standard itself must be referred to for its use and application.
Link to Active This link will always route to the current Active version of the standard. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Proceedings of an international conference Oceanology: While Test Method A electrolytic NaOH etch can be used as a aa923 test, it is sometimes not permitted asmt this purpose by User specifications.
The Validity of Using ASTM A Practice for Weld Procedure Qualification of Duplex SSs
Advanced search Show search help. This test method may be used with other evaluation tests to provide a rapid method for identifying those specimens that are free of detrimental intermetallic phases as measured in these other tests.
It is well known that the precipitation of intermetallics such as sigma phase and chi phase can promote loss of toughness, and loss of corrosion resistance. The presence or absence of corrosion attack in this test is not necessarily a measure of the performance of the material in other corrosive environments; in particular, it does not provide a basis for predicting resistance to forms of corrosion not associated with the precipitation of intermetallic phases see Note 4.
ASTM A Testing – Detecting Intermetallic Phases in Duplex Steels
Methods C through F are designed as incremental tests and require multiple specimens. This test method does not determine the critical pitting temperature or test for the suitability for use in a particular environment. Proceedings of an international conference Subsea Controls and Data Acquisition ‘ B The acceptable minimum impact energy shall be agreed upon by seller and purchaser.
Except for rapidly cooled material, it may be necessary to sample from a location determined to be the most slowly cooled for the material piece to be characterized. Rock Mechanics Symposium and 5th U. This test method is designed solely for detection of the precipitation of detrimental intermetallic phases in duplex stainless steels.
The speed of these precipitation reactions is a function of composition and thermal or thermomechanical history of each individual piece. A actually contains three different test methods for determining acceptability. Peer reviewed only Published between: Historical Version s – view previous versions of standard.
The values given in parentheses are for information only. There are no acceptance criteria for any alloys. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. As components in thicker sections were developed for expanding markets, the requirements necessary to obtain a good weld were similarly growing.
Alloy material a293 in a 6 wt. G48 contains six different test methods for evaluating a93 pitting and crevice corrosion resistance of stainless and nickel alloys.
However, since the tests are slightly different, material tested in accordance with one method cannot be certified to the other without re-testing.
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Log in to your subscription Username. The values given in parentheses are for information only. Recently, use of these alloys has met astn challenges, many of them having to do with welding operations. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
ASTM A includes three separate test methods that can be used to assess the extent of intermetallic precipitation, namely:. Because of the extensive testing required and time consuming nature, these tests are generally not used for production testing, even when acceptance criteria are provided.
When Test Method A is specified as an acceptance test, specimens having other than acceptable etch structures may, at the option of the producer, be tested by Test Method B or Test Method C.