Metallurgical evaluation of cast duplex stainless steels and. Link to active this link will always route to the current active version of the standard. Sep 12, 2019 the validity of using astm a practice for weld procedure qualification of duplex sss. Designer choices and responsibilities in astm c1063 and astm. Astma923 historical revision information standard test methods for detecting detrimental intermetallic phase in duplex austeniticferritic stainless steels astma923 2008 edition superseded show complete document history.
Test method asodium hydroxide etch test, test method bcharpy impact test, and test method cferric chloride corrosion test shall be made for classification of structures of duplex stainless steels. Test method c in a is a ferric chloride pitting test. Aug 17, 2019 astm a provides three methodspractices to determine the extent of intermetallic precipitation in duplex stainless steels. Astm standards subscriptions are annual and access is unlimited concurrency based number of. Pitting and crevice corrosion testing to astm g48 element. The method detects a loss of corrosion resistance associated with a local depletion of chromium andor molybdenum as a result of the precipitation of chromiumrich and possibly. Method c of a923 references astm g48 and the test method in a923 is very similar to methods a and e in g48. These test methods will not necessarily detect losses of toughness or corrosion resistance attributable to other causes. Test method for determining volume fraction by systematic manual point count.
C cr ni mo n mn cu w wrought duplex stainless steels firstgeneration duplex. The test involves the exposure of the materials in a 6 wt % ferrite chloride solution for test durations of 72 hours typically 24 hours. Methods a, b and c, charpy impact testing, weldability testing astm a494. Sodium hydroxide etch test for classification of etched structures of duplex stainless steels145 method b. Standard test methods for detecting detrimental intermetallic phase in duplex austeniticferritic stainless steels1 this standard is issued under the. Method for determining volume fraction by systematic manual point count. Active standard astm a923 developed by subcommittee. Classification of structures of duplex stainless steels sec tions 1420. Samples were prepared according to astm a370, with the notch centered at the weld metal and on haz near the fusion line. Astm g48 test method for pitting and crevice corrosion resistance of stainless steels and related alloys by use of ferric chloride solution is a standard testing procedure to determine the resistance of stainless steel to pitting and crevice corrosion by exposing the test pieces to oxidising solution fecl3. Astm a923 detecting detrimental intermetallic phase in duplex. Mar 01, 2019 astm a provides three methodspractices to determine the extent of intermetallic precipitation in duplex stainless steels.
Ferric chloride corrosion testing rolled alloys, inc. This document is available in either paper or pdf format. Stainless steel bar to find similar documents by classification. This standard test method applies only to those alloys listed in table 1.
Astm a923 pdf 1 jan buy astm a test methods for detecting detrimental intermetallic phase in duplex austeniticferritic. Astm a923 test methods for detecting detrimental intermetallic phase in duplex stainless steel. Amongst these is the requirement for corrosion testing during weld procedure qualification per astm a923, test method c. Astm a923, standard test method for detecting detrimental intermetallic. Alternate immersion corrosion testing per the astm g 44 standard practice. The test specimens shall include weld haz and base metal. Method a is the rapid screening method sodium hydroxide etch test for classification of etch structures of duplex stainless steels, and is preferable for quick analysis of susceptibility to intermetallics in the microstructure. Designer choices and responsibilities in astm c1063 and astm c926 regarding portland cement plaster wall claddings introductiongeneral brief history of the stucco industry standards the earliest stucco standards were voluntary and intended for the purpose. Astm a262 is a common intergranular corrosion testing method that can quickly screen batches of material to determine corrosion susceptibility. The validity of using the astm a923 test method c corrosion. Ferric chloride corrosion tests shall be in accordance with astm a923 test method c. A923 method b and c to quantify the effects of intermetallic phases, additional tests by method b, the charpy impact test for classification of structures of duplex stainless steels and method c, the ferric chloride corrosion test for classification of structures of. A variation of the astm g48a test used for duplex stainless steels is the astm a923 method c test.
Similar test methods for some higher alloyed duplex stainless steels are described in astm a923, but the procedures described in this standard differ significantly for all three methods from the ones described in a923. A923 method b and c to quantify the effects of intermetallic phases, additional tests by method b, the charpy impact test for classification of structures of. Astm a262 practice a, b, c, e and f intergranular corrosion testing. Astm a923 testing detecting intermetallic phases in duplex steels. Aug 24, 2019 astm a provides three methodspractices to determine the extent of intermetallic precipitation in duplex stainless steels. Duplex and astm g48a test metal and metallurgy engineering. Standardt est methodsfor detectingdetrimental intermetallic. Astm a 763 sensitization testing of ferritic steels. Element performs pitting corrosion testing following astm g48 a at test temperature, typically up to 60c. Testing of these materials per astm a923 was used to. Test method asodium hydroxide etch test, test method bcharpy impact test, and test method cferric chloride corrosion test. Astm a262 intergranular corrosion testing and analysis. Astm a923 testing for intermetallic phases in duplex steels.
Is modified g 48 testing the same thing as a 923 method c. Test method asodium hydroxide etch test, test method bcharpy impact test, and test method cferric chloride corrosion test shall xstm made for classification of structures of duplex stainless steels. Practical guidelines for the fabrication of duplex stainless. The area to be etched may be prepared by grinding a screening test for test method b or test method c, to an 80 or 120grit finish on a grinding belt or wheel without specimens having acceptable etch structures need not be excessive heating, and then by polishing on successively finer subjected to test method b or test method c. Final report, volume 2, the development of qualification. Test method asodium hydroxide etch test, test method bcharpy impact test, and test method c ferric chloride corrosion test shall be made for classification of structures of duplex stainless steels. Astm a923 1998 was implemented to assess the presence of intermetallic phases in base material, but has also been used for weld qualification. Choosing the correct method s rely on a complete understanding of your material and processes, as well as the. Astms and en international specifications were used pre.
Charpy vnotch samples per astm a923 method b as a method to determine the possibility of intermetallic precipitation and indirectly to assess corrosion resistance to pitting. Astm a provides three methodspractices to determine the extent of intermetallic precipitation in duplex stainless steels. The various tests which were carried out were astm a923 test method a, b and c sodium hydroxide etch test, charpy impact test and ferric chloride corrosion test, ferrite measurement using feritscope, astm e562 manual point count method and xray diffraction, hardness measurement using rockwell b and c and microstructural analysis using sem. Astm a923 14 standard test methods for detecting detrimental intermetallic phase in duplex austeniticferritic stainless steels. Charpy impact test for classification of structures of duplex. Standard test methods for detecting detrimental intermetallic phase in duplex austeniticferritic stainless steels. Jun 25, 2019 astm a was implemented to assess the presence of intermetallic phases in base material, but has also been used for weld qualification. The astm a262 testing specification contains five unique intergranular corrosion tests. Astm a923 14 standard test methods for detecting detrimental. This test method is a 24h test in 10 % ferric chloride. Astm a923 testing detecting intermetallic phases in.
Practical guidelines for the fabrication of duplex stainless steel. Astma923 standard test methods for detecting detrimental. Testing of these materials per astm a923 was used to determine if the foundry. Corrosion, toughness, weldability and metallurgical. Astm g48 pitting resistance testing corrosion and corrosion. One important difference is that g 48 permits the tester to disregard corrosion on the edges of the specimen.
Astm a923 testing detecting intermetallic phases in duplex. Important characteristics of each of the test methods are described as follows. The pcm is a systematic, manual counting procedure. Standard test methods for detecting detrimental intermetallic. Use of duplex stainless steels in the oil refining industry.
Annex c informative example of special welding and fabrication. A 370 test methods and definitions for mechanical testing 1. Jan 15, 2020 astm a provides three methodspractices to determine the extent of intermetallic precipitation in duplex stainless steels. Apr 26, 2017 astm a 923 method c specifically addresses each of these issues, and provides a basis for acceptance of the duplex stainless steels with regard to the absence of detrimental intermetallic phases. A92314 standard test methods for detecting detrimental intermetallic phase. A923 03 standard test methods for detecting detrimental intermetallic phase in wrought duplex austeniticferritic stainless steels, charpy impact test, detrimental intermetallic phase detection, duplex stainless steel, etch structures, ferric chloride corrosion test, intermetallic phase detection, sodium hydroxide etch test, stainless steel, wrought duplex stainless steel, detrimental.
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