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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NOTE 9—Intergranular attack in nitric acid is associated with one or more of the following: Excessive corrosion may often be detected by changes in the color of the test solution, and it may be appropriate to provide separate containers for such specimens without waiting until the end of the test period. The second type of container is the so-called multi-sample testing apparatus 5 which was ast, to permit the testing of a large number of specimens simultaneously by providing for replacement of the acid in contact with the specimens several times per hour with redistilled acid.
G2MT Laboratories
The presence or absence of intergranular attack in this test is not necessarily a measure of the performance of the material in other corrosive environments. The Huey test works well to analyze chromium depleted regions and intermetallic precipitates, such as sigma phase, and is also sstm for materials in strongly oxidizing environments such as nitric acid.
A — 10 FIG. The purpose of these treatments is to remove any surface contamination that may not be accomplished by the regular cleaning method and which may increase the apparent weight loss of the specimen during the early part of the test.
It does not detect susceptibility associated with sigma phase. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
A226-10 abstract is a brief summary of the referenced standard. The corrosion rate should be reported as millimetres of penetration per month Note 8 calculated as follows: If an encircled grain is found, the steel should be evaluated as a ditch structure.
The weight loss is calculated after each step, and reveals if the sample has been properly heat-treated.
ASTM A不锈钢晶间腐蚀试验_图文_百度文库
Scale should be removed from the area to be etched by grinding to an or aa262-10 A — 10 completely. What is your typical turnaround time? One of these consists of a 1-L Erlenmeyer?
The corrosion rates should be reported as millimetres of penetration per month Note 8calculated as follows: This may cause rapid intergranular attack in the nitric acid test.
An air or hydraulic press atm also be used for bending the specimens. There may be restrictions placed on specimen size by the testing apparatus.
Over 5 mm 3? However, in the special case of surface carburization sometimes encountered, for instance, in tubing or castings when lubricants or binders containing carbonaceous materials are employed it may be possible by heavy grinding or machining to completely remove the carburized surface. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? However, in the special case of surface carburization sometimes encountered, for instance, in tubing or castings when lubricants or binders containing carbonaceous materials are employed it may be possible by heavy grinding or machining to remove the carburized surface 6 The sole source of supply of the apparatus known to the committee at this time is Amphoteric alundum granules, Hengar Granules, from the Hengar Co.
This test also reveals susceptibility to end grain attack in all grades of stainless steels. NOTE 2—All photomicrographs were made with specimens that were etched under standard conditions: A — 10 6.
Steps between austenite matrix and ferrite pools To differentiate between the types of pits, use a magni?
ASTM A Intergranular Corrosion Testing and Analysis
asrm It may also be used to check the effectiveness a62-10 stabilizing columbium or titanium additions and of reductions in carbon content in preventing susceptibility to rapid intergranular attack. Last previous edition approved in as A — 02a asym A — 10 in tubing or castings when lubricants or binders containing carbonaceous materials are employedit may be possible by heavy grinding or machining to remove the carburized surface completely.
Because it can be run quickly for screening, we often run this test first. When specimens of such products are being tested in research investigations, the ratio of the cross-sectional area exposed to the total area should be kept constant from test to test. NOTE 24—Cracking that originates at the edge of the specimen should be disregarded.
A — 10 boiling test solution. Practice B, also known as the Streicher test, uses weight loss analysis to provide a quantitative measure of the materials performance. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. This will assure detection of intergranular attack resulting from carburization of one surface of sheet material during the? Including alloyed steels, corrosion-resistant steels, heat-resisting steels, etc.
The etch structure types used to classify the specimens are: It depends on which Practice is selected, but typically ranges from to days for different tests.
A recent publication on intergranular corrosion. Millimetres per month 3 0. Such specimens have low corrosion rates in the various hot acid tests, requiring from 4 to h of exposure. Please share this page: Practice E, the Strauss test, is performed to assess attack associated with chromium-rich carbide formation; a622-10 does not detect susceptibility to sigma phase formation.