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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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. Use of Etch Structure Classi? Alloy Casting Institute designations.
Classification of the structure after A Practice A analysis will determine if the material is acceptable or if additional testing is a622-10. The rate of heating depends on the total current ammeter reading passing through the cell.
Sandblasting should not be used. These specimens are identi?
Such specimens have low corrosion rates in the various hot acid tests, requiring from 4 to h of exposure. In cases that appear to be dual structures, more extensive examination is required to determine if there are any grains completely encircled.
Steps between austenite matrix and ferrite pools. This standard has been approved for use by agencies of the Department of Defense. The corrosion rate should be reported as millimetres of penetration per month Note 8 calculated as follows: Because of the a262–10 accumulation of corrosion products in the testing solution, the rates ast with the multi-sample tester are consistently lower than those obtained with the conventional apparatus; the differences are small on properly annealed or stabilized material, which will show low rates in both types of test but can be very large for sensitized specimens.
Preparation, etching, and the classi? How do you select the right ASTM corrosion testing method for your material? If an encircled grain is found, the steel should be evaluated as a ditch structure.
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. Due to the variance of attack in different materials, numerous methods Practices B-F are used to assess intergranular corrosion. X262-10 length of time used for this sensitizing treatment determines the maximum permissible corrosion rate in the nitric acid test. Care should be taken to avoid carburizing or nitriding the specimens.
A — 10 The etch structure types used a262-110 classify the specimens are: No further reproductions authorized. Residual oxide scale causes galvanic action and consequent ashm in the test solution. These tests do not provide a basis for predicting resistance to forms of corrosion other than intergranular, such as general corrosion, pitting, or stress-corrosion cracking. Cold-rolled strip or sheets may be tested in the thickness supplied.
Important characteristics of each of these tests are described below. Such sharp, deep pits should astk be confused with the shallow pits shown in Fig. It may be applied to wrought products including tubescastings, and weld metal.
The inch-pound equivalents are in parentheses and may be approximate. A — 10 6. This polishing operation can be carried out in a relatively short time since ashm large scratches need not be removed. NOTE 4—To detect susceptibility to intergranular attack associated with sigma phase in austenitic stainless steels containing molybdenum, the nitric acid test, Practice C, should be used.
Summary of Practice The number 3 or 4 is limited only by the number of glass cradles that can be? Approved April 1, 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. Practice F, is a hour weight-loss based analysis that provides a quantitative measure of the materials performance, and is commonly used to analyze as-received stainless steels.
The test does not provide a basis for predicting resistance to forms of corrosion other than intergranular, such as general corrosion, pitting, or stress-corrosion cracking.
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. However, if with this shorter test procedure the rate of attack in the third period should exceed that in either the?
For research purposes or where results are to be compared directly, it is essential that the same type of apparatus be used for all tests. A small amount of copper shot 8 to 10 pieces on the bottom of the? If you are not sure, please contact us for assistance. Please specify the maximum allowable corrosion rate and any available data on the sensitizing heat treatment performed. A trip balance may be used. Current edition approved April 1, D Must be tested in nitric acid test when destined for service in nitric acid.
The test does not provide a basis for predicting resistance to other forms of corrosion, such as general corrosion, pitting, or stresscorrosion cracking.