Designation: A – 10 Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels1 This standard is. ASTM, 16 p, A Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels Abstract This. ASTM A – Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels Thanks in advance.
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This test may be used to evaluate the heat treatment accorded as-received material.
Work Item s – proposed revisions of this standard. The Huey test works well to analyze chromium depleted regions and intermetallic precipitates, such as sigma phase, and is also a2662-10 for materials in strongly oxidizing environments such as nitric acid. Normally, the maximum convenient weight of specimen is about g. A — 10 completely. Microscopical examination of an etch made on a specimen containing sheared edges, should be made on metal unaffected by shearing.
Preparation of Test Specimens The latter may be formed in molybdenum-bearing and in stabilized grades of austenitic stainless steels and may or may not be visible in the microstructure. NOTE 17—Conversion factors to other commonly used units for corrosion rates are as follows: For very heavy sections, specimens should be machined to represent the appropriate surface while maintaining a262-0 specimen size for convenient testing.
Such treatment of test specimens is not permissible, except in tests undertaken to demonstrate such effects. The purpose of these treatments is to remove any surface contamination that may not aetm accomplished by the regular cleaning method and which may increase the apparent weight loss of the specimen during the early part of the a262-1.
NOTE 5—Other equivalent means of specimen support, a26-10 as glass hooks or stirrups, may also be used. All stainless grades listed in the accompanying table may be evaluated in these combinations of screening and corrosion tests, except those specimens of molybdenum-bearing grades for exampleL,and Lwhich represent steel intended for use in nitric acid environments.
Some specific hazards statements are given in A — 10 determine the susceptibility of austenitic stainless steels to intergranular attack. Cold-rolled strip or sheets may be astj in the thickness supplied.
The test uses a visual inspection of the surface of the bent specimen to determine pass or fail. Intergranular corrosion occurs as a result of precipitation of nitridescarbidesand other intermetallic phasessuch as sigma phase, that occurs along the grain boundaries.
NOTE 2—All photomicrographs were made with specimens that were etched under standard conditions: It is not permissible, for example, to conduct nitric-hydro? If an encircled grain is found, the steel should be evaluated as a ditch structure.
One of these consists of a 1-L Erlenmeyer? The ferric a62-10 acid test will detect intergranular corrosion associated with sigma phase in the cast stainless steels CF-3M and CF-8M.
Chemical removal of scale is permissible when this is the case. Normally, a volume of about cm3 is used.
A — 10 in tubing or castings when lubricants or binders containing carbonaceous materials are employed adtm, it may be possible by heavy grinding or machining to remove the carburized surface completely.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. The presence asfm absence of intergranular corrosion in this test is not necessarily a measure of the performance of the material in other corrosive media.
ASTM A Intergranular Corrosion Testing and Analysis
Specimens having nonacceptable etch structures must be tested in the speci? This test also reveals susceptibility to end grain attack in all grades of stainless steels. For very heavy sections, specimens should be machined to represent the appropriate surface while maintaining reasonable specimen size ashm convenience in testing. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
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. An equivalent area of copper shot or chips may be used. American Iron a2662-10 Steel Institute designations for austenitic stainless steels.
Drying may be facilitated, if desired, a26-210 dipping the specimens in acetone after they are scrubbed. A visual comparison between these specimens should assist in interpretation. Calculation and Report It should have three or four holes to increase circulation of the testing solution around the specimen.
During the test, ferric sulfate is consumed at a rate of 10 g for each 1 g of dissolved stainless steel. Add the acid a226-10 to the water in the Erlenmeyer?