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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These tests offer asmt means to evaluate and compare the expected performance of various alloys. Recently, use of these alloys has met with challenges, many of them having to do with welding operations.
Referenced Documents purchase separately The sstm listed below are referenced within the subject standard but are not provided as part of the standard. 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.
They can be used as acceptance asm if criteria e. Required energy for a subsize specimen is reduced in direct proportion to the reduced area of the a9233 specimen relative to that of the full-size specimen. This test method does not determine the critical pitting temperature or test for the suitability for use in a particular environment. Z923 tests identify the minimum critical temperature needed to initiate pitting or crevice corrosion. There are no acceptance criteria for any alloys.
However, these parameters can be modified to suit individual test needs. The speed of these precipitation reactions is a function of composition and thermal or thermomechanical history of each individual piece. Proceedings of an international conference Oceanology: The values given in parentheses are for information only.
The Validity of Using ASTM A Practice for Weld Procedure Qualification of Duplex SSs
Alloy material tested in a 6 wt. In the case of common heat treatment, this region will be that which cooled most slowly. Return to Blog List.
As components in thicker sections were developed for expanding markets, the requirements necessary to obtain a good weld were similarly growing.
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. A Energy for a full-size specimen. A9223 America Asia Europe Tools. Proceedings of an international conference Diverless and Deepwater Techology: Proceedings of an international conference Subsea Controls and Data Acquisition asttm These test methods will not necessarily detect losses of toughness or corrosion resistance attributable to other causes.
Link to Active This link will always route to the current Active version of the standard. These test methods will not necessarily detect losses of toughness or corrosion resistance attributable to other causes. Rock Mechanics Symposium and 5th U.
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. 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.
Test method A-sodium hydroxide etch test, test method B-Charpy impact test, and test method C-ferric chloride corrosion test shall be made for classification of structures of duplex stainless steels. Because of the asfm testing required and time consuming nature, these tests are generally astn used for production testing, even when acceptance criteria axtm provided.
This abstract is a brief summary of the referenced standard. The speed of these precipitation reactions is a function of composition and thermal or thermomechanical history of each individual piece. Active view current version of standard.
A actually contains three different test methods for determining acceptability. Rapid cooling of the product provides the maximum resistance to formation of detrimental phases by subsequent thermal exposures. This test method may be used with other evaluation tests to provide a rapid asm for identifying those specimens that are free of detrimental intermetallic phases as measured in these other tests.
This test method is designed solely for detection of the precipitation of detrimental intermetallic phases in duplex stainless steels. 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.