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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C Ring sections are not? A — 10 A — 10 determine the susceptibility of austenitic stainless steels to intergranular attack. Preparation, etching, and the classi? NOTE 6—No substitutions for this equipment may be used. 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.
It does not detect susceptibility associated with sigma phase. The rate of heating depends on the total current ammeter reading passing through the cell. The corrosion rate should be reported as millimetres of penetration per month Note 8 calculated as follows: 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.
These practices include five intergranular corrosion tests, namely: It is important to ensure that the concentration of acid does not become more concentrated and that an adequate number of boiling chips which are resistant to attack aetm the test solution are present.
Use of Etch Structure Classi? Whenever practical, a polished area of 1 cm2 or more is desirable. To pass through the ground glass joint on the Erlenmeyer? For example, many low-carbon and stabilized stainless qstm e.
Preparation of Test Specimens 5.
Add the acid slowly to the water in the Erlenmeyer? The ASTM A tests can asm if the proper heat treatment was performed or if the alloys are in danger of intergranular corrosion occurring in use.
An equivalent area of copper shot or chips may be used. The inch-pound equivalents are in parentheses and axtm approximate. D Must be tested in nitric acid test when destined for service in nitric acid. Intergranular cracking or crazing is evidence of susceptibility. 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.
This practice includes boiling the sample for 24 to hours in the solution above, and measures the materials performance quantitatively. A — 10 to the oxalic acid etch test. Cold-rolled strip or sheets may be tested in the thickness supplied. It depends on which Practice is selected, but typically ranges from to days for different tests.
Share on Tumblr Print. Such weight-loss determinations should be made with the accuracy prescribed in See Practice A, Oxalic Acid Etching Test, for information on a262-100 most appropriate of the several test methods available for the evaluation of speci? This will assure detection of intergranular attack resulting from carburization of one surface of sheet material during the? The presence or absence of intergranular attack in this test is not necessarily a measure of the performance of the material in a62-10 corrosive environments.
This increases the resistance of the etching cell. NOTE 15—Care should be a262-1 to prevent contamination of the testing solution, especially by? The heat treating qstm best carried out in air or neutral salt.
Over 5 mm 3? No further reproductions authorized. Microscopical examination of an etch made on a specimen containing sheared edges, should be made on metal unaffected by shearing.
Normally, a volume of about cm3 is used. Determine the maximum angle of bend without causing cracks in such material by bending an untested specimen of the same con? However, any susceptibility to intergranular attack is readily detected by pronounced ditches.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. NOTE 5—Other equivalent means of specimen support, such as glass hooks or stirrups, may also be used.
Such sharp, deep pits should not 2a62-10 confused with the shallow pits shown in Fig. Areas near a262-110 should be examined for evidence of surface carburization. Because of the lesser accumulation of corrosion products in the testing solution, the rates obtained 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.
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.
ASTM A Intergranular Corrosion Testing and Analysis
Practice B, also known as the Streicher test, uses weight loss analysis to provide a quantitative measure of the materials performance. The solution volume-to-sample area ratio is to be maintained. A trip balance may be used. An electrically heated hot plate is satisfactory for this a2262-10.