ASTM A923 PDF

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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This abstract is a brief summary of the referenced standard. Proceedings of an international conference Diverless and Deepwater Techology: Return to Blog List.

These tests identify the minimum critical temperature needed to initiate pitting or crevice corrosion. Peer reviewed only Published between: Historical Version s – view previous versions of standard.

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Rapid cooling of the product provides the maximum resistance to formation of detrimental phases by subsequent thermal exposures.

Rock Mechanics Symposium and 5th U. 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. North America Asia Europe Tools. This test method does not determine the critical pitting temperature or test for the suitability for use in a particular environment.

G48 contains six different test methods for evaluating the pitting and crevice corrosion resistance of stainless and nickel alloys. Sheriff’s Encyclopedic Dictionary of Applied Geophysics, fourth edition. While Test Method A electrolytic NaOH etch can be used as a screening test, it is sometimes not permitted for this purpose by User specifications.

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Because the occurrence of intermetallic phases is a function of temperature and cooling rate, it is essential that the tests be applied to the region of the material experiencing the conditions most likely to promote the formation of an intermetallic phase.

ASTM A Testing – Detecting Intermetallic Phases in Duplex Steels

These tests offer a means to evaluate and compare the expected performance of various alloys. B The acceptable minimum impact energy shall be agreed upon by seller and purchaser.

The speed of these precipitation reactions is a function ast, composition and thermal or thermomechanical history of each individual piece. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. 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.

Proceedings of an international conference Subsea Controls and Data Acquisition ‘ Log in to your subscription Username. Methods C through F are designed as incremental tests and require multiple specimens.

Link to Active This link will s923 route to the current Active version of the standard. 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.

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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. Test Method C in A is a ferric chloride pitting test. Note that these are not acceptance tests as written in G48 as there are no acceptance criteria. These test methods will not necessarily detect losses of toughness or corrosion resistance attributable to other causes. ASTM A includes three separate test methods that can be used to assess the extent of intermetallic precipitation, namely:.

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A actually contains three different test methods for determining acceptability.

Link to Active This link will always route to the current Active version of aetm standard. Recently, use of these alloys has met with challenges, many of them having to do with welding operations. Because of the wide experience in the production testing of duplex alloys, testing in accordance with A is recommended.

Ferric Chloride Corrosion Testing – Rolled Alloys, Inc.

Proceedings of an International Conference Submersible Technology: 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. They can be used as acceptance tests if criteria e. The speed of these precipitation reactions is a function of composition and thermal or thermomechanical history of each individual piece. The presence or absence of an indication of intermetallic phase in this test is not necessarily a measure of performance of the material in service with regard to any property other than that measured directly.

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.