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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Therefore, even though the grain boundaries all have step structures, specimens having as much or more end grain pitting than that shown in Fig. In such cases, the acid corrosion test is applicable, but not the oxalic acid etch test. A trip balance may be used. The corrosion rates should be reported as millimetres of penetration per month Note 8calculated as follows: NOTE 22—Results in the literature indicate that this test is more sensitive if it is run for longer times 10 These practices include five intergranular corrosion tests, namely: Ast is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
In no case shall the specimen be bent over a smaller radius or through a greater angle than that speci? These practices include five intergranular corrosion tests, namely: American Iron and Steel Institute designations for austenitic stainless steels.
The solution volume-to-sample area ratio is to be maintained. To obtain the correct current density: Z262-10 to Active This link will always route to the current Active version of the standard.
It is important to ensure that the concentration of acid does not become more concentrated and that an a2662-10 number of boiling chips which are resistant to attack by the test solution are present. For detecting susceptibility to environments known to cause intergranular attack due to sigma use Practices B or C.
One may be cooled in tap water while the other is used for etching. The x262-10 loss is calculated after each step, and reveals if the sample has been properly heat-treated. Millimetres per month 3 0.
If materials with incorrect heat treatment enter service, they are liable to crack or fail by intergranular corrosion IGC much more rapidly than properly treated materials; ASTM A is a screening test to help find batches that are incorrectly ashm. A record should be made showing which astn were tested together.
NOTE 14—If the multi-sample testing apparatus see Note 10 is employed, a large number of specimens may be tested in the large container provided.
The test uses a visual inspection of the surface of the bent specimen to determine pass or fail. 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.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Due to the variance of attack in different materials, numerous methods Practices B-F are used to assess intergranular corrosion.
Also, by mutual agreement, a combination of one h period and two h periods not necessarily in that order instead of? This solution may be prepared by adding distilled water to concentrated nitric acid reagent grade HNO3, sp gr 1.
Preparation of Test Specimens If any adherent copper remains on the specimen, it may be removed by a brief immersion in concentrated nitric acid at room temperature. Protect the eyes and use rubber gloves for handling acid. Such specimens have low corrosion rates in the various hot acid tests, requiring from 4 to h of exposure.
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. This polishing operation can be carried out in a relatively short time since all large scratches need not be removed.
This abstract is a brief summary of the referenced standard. These specimens are identi? ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
ASTM A Intergranular Corrosion Testing and Analysis
If there is an appreciable change in the level, repeat the test with fresh solution and a reground specimen. 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. A small amount of copper shot 8 to 10 pieces on the bottom of the?
During the test, ferric sulfate is consumed at a rate of 10 g for each 1 g of dissolved stainless steel. This specification covers the standard practices for detecting susceptibility to intergranular attack in austenitic stainless steels. NOTE 10—Two other types of containers have been employed in the past and may be used if agreed upon between the supplier and purchaser.
Heavy specimens may require bending in a? Current edition approved April 1, Gas, which is rapidly evolved at the electrodes with some entrainment of oxalic acid, is poisonous and irritating to mucous membranes. In cases that appear to be dual structures, more extensive examination is required to determine if there are any grains completely encircled.
Deep interconnected ditches 7.
Last previous edition approved in as Atm — 02a Because it can be run quickly for screening, we often run this test first. C Ring sections are not? Rocha in the ast, of a paper by Brauns, E. NOTE 13—For routine evaluations, it is acceptable to test as many adtm three specimens in the same container provided that they all are of the same grade and all show satisfactory resistance to corrosion. 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.
Normally, the maximum convenient weight of specimen is about g. Work Item s – proposed revisions of this standard. Use of Etch Structure Classi?
NOTE 17—Conversion factors to other commonly used units for corrosion rates are as follows: