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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Link to Active This link will always route to the current Active version of the standard. Proceedings of an international conference Diverless and Deepwater Techology: Alloy material tested in a 6 wt. In the case of common heat treatment, this region will be that which cooled most slowly. 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.
In the case of common heat treatment, this region will be that which cooled most slowly. 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.
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. 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.
Rock Mechanics Symposium and 5th U. 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.
Proceedings of an international conference Subsea Controls and Data Acquisition ‘ It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. There are no acceptance criteria for any alloys. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
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. 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. The speed of these precipitation reactions is a function of composition and thermal or thermomechanical history of each individual piece.
Ferric Chloride Corrosion Testing – Rolled Alloys, Inc.
Proceedings of an International Conference Submersible Technology: ASTM A includes three separate test methods that can be used to assess the extent of intermetallic precipitation, namely:. Link to Active This link will x923 route to the current Active version of the standard. The presence of these phases is detrimental to toughness and corrosion resistance.
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Peer reviewed only Published between: B The acceptable minimum impact energy shall be agreed upon by seller and purchaser. The speed of these precipitation reactions is a function of composition and thermal or thermomechanical history of each individual piece.
Note that these are not acceptance tests as written in G48 as there are no acceptance criteria. Return to Blog List. However, since the tests are slightly different, material tested in accordance with one method cannot be certified to the other without re-testing. Test Method C in A is a ferric chloride pitting test. Required energy for a subsize specimen is reduced in direct proportion to the reduced area of the subsize specimen relative to that of the full-size specimen.
Log in to your subscription Username. G48 contains six different test methods for evaluating the pitting and crevice corrosion resistance of stainless and nickel alloys. 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.
Because of the wide experience in the production testing of duplex alloys, testing in accordance with A is recommended.
The values given in parentheses are for information only. Publishers Content Coverage Privacy. Rapid cooling of the product provides the maximum resistance to formation of detrimental phases by subsequent thermal exposures.
This test method is designed solely for detection of the precipitation of q923 intermetallic phases in duplex stainless steels.
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. 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.
Advanced search Show search help. 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. The pH is adjusted to 1.
The Validity of Using ASTM A Practice for Weld Procedure Qualification of Duplex SSs
The presence of these phases is detrimental to toughness and corrosion resistance. Note 4—Although this test method uses some equipment and procedures similar to those of Test Methods G 48this test method should not be confused with Test Methods G However, these parameters can be modified to suit individual test needs.
Referenced Documents purchase separately The documents listed below are referenced within the subject qstm but are not provided as part of the standard. ASTM A was implemented to assess the presence of intermetallic phases in base material, but has also been used for weld qualification. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability aztm regulatory limitations prior to use.
Recently, use of a293 alloys has met with challenges, many of them having to do with welding operations. A actually contains three different test methods for determining acceptability.
A Energy for a full-size specimen. The values given in parentheses are for information only.