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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Experience has shown that the presence of even small amounts of hydro? Such sharp, deep pits should not be confused with the shallow pits shown in Fig.
Fresh test solution would not be needed if the test were to run 48 or even 72 h. Steps between austenite matrix and ferrite pools. Preparation, etching, and the classi? This test also reveals susceptibility to end grain attack in all grades of stainless steels. Bent area at magni? Preparation of Test Specimens A — 10 apparatus dictates the? Cold-rolled strip or sheets may be tested in the thickness supplied.
This polishing operation can be carried out in a relatively short time since all large scratches need not be removed. G2MT Labs is one of the few labs to offer all five ASTM A corrosion testing practices, as well as the expertise to help you determine which tests to use, what to do if a test fails, and other corrosion consulting as needed.
This abstract is a brief summary of the referenced standard. This may be used in connection with other evaluation tests to provide a rapid method for identifying those specimens that are certain to be 3 For referenced ASTM standards, visit the ASTM website, www.
Such treatment of test specimens is not permissible, except in tests undertaken to demonstrate such surface effects. 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.
The tests can be run without interruption for h. These practices include five intergranular corrosion tests, namely: Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
The use of etch structure evaluations in connection with the ferric sulfate-sulfuric acid test is speci?
Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version a26-10 If dry abrasive paper is used, polish slowly to avoid overheating. 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; in particular, it does not provide a basis for predicting resistance to forms of corrosion other than intergranular, such as general corrosion, pitting, or stress-corrosion cracking.
Originally approved in A number in parentheses indicates the year of last reapproval.
Chemical removal of scale is permissible when this is the case. NOTE 21—Measures should awtm taken to minimize bumping of the solution when glass cradles are used to support specimens.
NOTE 9—Intergranular attack in nitric acid is associated with one or more of the following: Alloy Casting Institute designations.
Cross-sectional areas in these products may be subject to end grain attack in nitric acid. Permission rights to photocopy the standard may also be secured from the ASTM website www.
Specimens containing welds should be cut so that no more than mm 1? Based on your materials, application, and requirements, the other 4 methods provide specific focuses. The ASTM A tests can determine if the proper heat treatment was performed or if the alloys are in danger of intergranular corrosion occurring in use. Please share this page: It may also be used to evaluate the effectiveness of stabilizing element additions Cb, Ti, and so forth and reductions in carbon content to aid in resisting intergranular attack.
The boiling nitric acid test should not be used for extra-low-carbon molybdenum-bearing grades unless the material tested is to be used in nitric acid service. Protect the eyes and face by face shield and use rubber gloves and apron when handling acid.
If there is an appreciable change in the level, repeat the test with fresh solution and a reground specimen. A trip balance may be used.
ASTM A Intergranular Corrosion Testing and Analysis
Up to 6 mm? A record should be made showing which specimens were tested together. In many cases we can reduce astk to as little as 24 hours more than the required testing time if you need fast results. The rate of heating depends on the total current ammeter reading passing through the cell. Satm heat treating is best carried out in air or neutral salt.
Current edition approved April 1, Rapid Screening Test 9. The etch structure types used to classify the specimens are: