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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Contact us now for pricing or a quote! Specimens containing welds should be cut so that no more than 13 mm 1? Chemical removal of scale is permissible when this is the case.
Methods for preparing the test specimens, rapid screening tests, apparatus setup and testing procedures, and calculations and report contents are described for each testing practice. The use of etch structure evaluations s262-10 connection with the ferric sulfate-sulfuric acid astmm is speci? A62-10 18—It may be necessary to embed large specimens, such as from heavy bar stock, in copper shot on the bottom of the test? Permission rights to photocopy the standard may also be secured from the ASTM website www.
Preparation of Test Specimens The Strauss test is commonly used to evaluate zstm heat-treatment of as-received material, the effectiveness of alloying additions of elements such as Nb and Ti, or the effectiveness of reducing carbon content to resist intergranular attack.
It does not detect susceptibility to attack associated with sigma phase. The ground glass opening is somewhat over 38 mm 11? NOTE 2—The oxalic acid etch test may be applied to the grades of stainless steels listed in the rectangles when used in connection with the test indicated by the arrow.
The pits which now appear completely black are end grain pits.
These lists may contain grades of steels in addition to those given in the rectangles. If there is an appreciable change in the level, the test must be repeated with fresh solution and a satm specimen. If not 15 h, the test time shall be speci?
ASTM A Intergranular Corrosion Testing and Analysis
This polishing operation can be carried out in a relatively short time since all large scratches need not be removed. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Intergranular corrosion occurs as a result of precipitation of nitridescarbidesand other intermetallic phasessuch as sigma phase, that occurs along the grain boundaries.
Each ASTM A Practice specification includes a list of the grades of stainless steels and the acceptable etch structures for the specific alloys.
Such sharp, deep pits should not be confused with the shallow pits shown in Fig. However, in the special case of surface carburization sometimes encountered, for instance, in tubing or castings when lubricants or binders asfm carbonaceous materials are employed it may be possible by heavy grinding or machining to completely remove the carburized surface. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete awtm up to date.
The second type of container is the so-called multi-sample testing apparatus s262-10 which was designed 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.
The tests can be run without interruption for h. Add the acid slowly to the water in the Erlenmeyer? These practices include five intergranular corrosion tests, namely: Practice A, the oxalic acid etch test is used as a rapid technique to screen samples of certain stainless steel grades to ensure they are not susceptible to intergranular attack sensitization. Because a62-10 can be run quickly for screening, we often run this test first.
These specimens are identi? Intergranular corrosion shows xstm as the dark black lines around the grain boundaries. During the test, ferric sulfate is consumed at a rate of 10 g for each 1 g of dissolved stainless steel. Due to the variance of attack in different materials, numerous methods Practices B-F are used to assess intergranular corrosion.
This may cause rapid intergranular attack in the nitric acid test. One may be cooled in tap water while the other a22-10 used for etching. If dry abrasive paper is used, polish slowly to avoid overheating.
No further reproductions authorized. When this occurs, the? NOTE 13—For routine evaluations, it is acceptable to test as many as three specimens in the same container provided that they all are of the same grade and all show satisfactory resistance to corrosion.
Duplicate samples from both sides of a sheet sample are evaluated to determine if carburization results in intergranular attack.
Heavy specimens a26210 require bending in a? E To date, no data have been published on the effect of sigma phase on corrosion of AISI in this test.
Also needed are the following: It does not detect susceptibility to end grain attack, which is also found only in certain nitric acid environments. It is typically used for stainless alloys such as andCr-Ni-Mo stainless alloys, and nickel alloys to evaluate the intergranular attack associated with the precipitation of chromium carbides at grain boundaries. Experience has shown that the presence of even small amounts of hydro?