ASTM A262-10 PDF
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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Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. If these pits are sharp and so deep that they appear black Fig. The tests can be run without interruption for a622-10. Work Item s – proposed revisions of this standard.
a26210 C Ring sections are not? Fresh test solution would not be needed if the test were to run 48 or even 72 h. A number in parentheses indicates the year of last reapproval. A small amount of copper shot 8 to 10 pieces on the bottom of the? The use of etch structure evaluations in connection with the ferric sulfate-sulfuric acid test is speci?
ASTM A Intergranular Corrosion Testing and Analysis
The inch-pound equivalents are in parentheses and maybe approximate. Asfm the test, ferric sulfate is consumed at a rate of 10 g for each 1 g of dissolved stainless steel. A — 10 NOTE 1—The variable resistance and the ammeter are placed in the circuit to measure and control the current on the specimen to be etched.
A — 10 determine the susceptibility of austenitic stainless steels to intergranular attack.
Because it can be run quickly for screening, we often aa262-10 this test first. All specimens having nonacceptable etch structures must be tested in the ferric sulfate-sulfuric acid test. Including alloyed steels, corrosion-resistant steels, heat-resisting steels, etc.
Gas, which is rapidly evolved at the electrodes with some entrainment of oxalic acid, is poisonous and irritating to mucous membranes. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
For very heavy sections, specimens should be machined to represent the appropriate surface while maintaining reasonable specimen size for convenience in testing. An equivalent area of copper shot or chips may be used. The presence or absence of intergranular attack in this axtm is not necessarily ashm measure of the performance of the material in other corrosive environments.
Such specimens have low corrosion rates in the various hot acid tests, requiring from 4 to h of exposure.
In everyday applications, corrosion varies by materials and solutions. The etch structure types used to classify the specimens are: The first and fastest step is the ASTM A Practice A, a rapid same-day screening method in Oxalic acid to determine the susceptibility to intergranular corrosion.
In no case shall the specimen be bent over a smaller radius or through a greater angle than that speci? These tests are often run as a qualification test to ensure each batch of stainless steel is properly prepared.
NOTE 21—Measures should be taken to minimize bumping of the solution when glass cradles are used to support specimens. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: The length of time of heating used for this sensitizing treatment determines the maximum permissible corrosion rate for such grades in the ferric sulfate-sulfuric acid test.
D Specimens from welded tubes over 38 mm 1?
It is ideal to have all the specimens in one? Specimens having nonacceptable etch structures must be tested in the speci? This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Your comments will receive careful consideration at a meeting of the responsible technical committee,1 which you may attend.
The test does not provide a basis for predicting resistance to forms of corrosion other than intergranular, such as general corrosion, a2622-10, or stress-corrosion cracking.
Specimens containing welds should be cut so that no more than 13 mm 1? Such treatment of test specimens is not permissible, except in tests undertaken to demonstrate such surface effects. All stainless grades listed in the accompanying table may be evaluated in these combinations of screening and corrosion tests, except those specimens of molybdenum-bearing grades for exampleL,and Lwhich represent steel intended for use in nitric acid environments.
Also, by mutual agreement, a combination of one h period and two h periods not necessarily in that order instead of? The corrosion rates should be reported as millimetres of penetration per month Note 8calculated as follows: Therefore, even though the grain boundaries all have step structures, specimens having as much or more end grain pitting than that shown in Fig.
A — 10 FIG. Practice E, the Strauss test, is performed to assess attack associated with chromium-rich carbide formation; it does not detect susceptibility to sigma phase formation. The proportion of end grain in the specimen should therefore be kept low unless such surface is actually to be exposed in service involving nitric acid.
After exposure in the boiling solution, the specimen is bent. 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.