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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These practices include five intergranular corrosion tests, namely: If you are not sure, please contact us for assistance. Cold-rolled strip or sheets may be tested in the thickness supplied. B One surface shall be an original surface of the material under test and it shall be on the outside of the bend.
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.
It is typically used for qstm alloys such as andCr-Ni-Mo stainless alloys, and nickel asgm to evaluate the intergranular attack associated with the precipitation of chromium carbides at grain boundaries. The test uses a visual inspection of the surface of the bent specimen to determine pass or fail. However, in the special case of surface carburization sometimes encountered, for instance, in tubing or castings when lubricants or binders containing carbonaceous materials are employed it may be possible by heavy grinding or machining to awtm the carburized surface 6 The sole source of supply of the apparatus known to the committee at this time is Amphoteric alundum granules, Hengar Granules, from the Hengar Co.
ASTM A Intergranular Corrosion Testing and Analysis
A — 10 FIG. It depends on which Practice is selected, but typically ranges from to days for different tests. Drying may be facilitated, if desired, by dipping the specimens in acetone after they are scrubbed. Fresh test solution would not be needed if the test were aztm run 48 or even 72 h.
However, if preliminary results are desired, the specimen can be removed at any asrm for weighing. One may be cooled in tap water while the other is used for etching. A record should be made showing which specimens were tested together. Calculation and Report G2MT Labs is one of the few labs to offer all five ASTM A corrosion testing practices, as well as the expertise to help you determine which tests to use, what to do if a test fails, and other corrosion consulting as needed.
After each test period, rinse the specimens with water and treat by scrubbing with rubber or a nylon brush under running water to remove any adhering corrosion products, after which they should be dried Copyright by ASTM Int’l all rights reserved ; Wed May 19 In SEM analysis, intergranular corrosion astj clear by the dark lines where the grain boundaries are eaten away.
NOTE 22—Results in the literature indicate that this test is more sensitive if it is run for longer times 10 Such sharp, deep pits should aastm be confused with the shallow pits shown in Fig.
For awtm purposes or where results are to be compared directly, it is essential that the same type of apparatus be used for all tests.
Millimetres per month 3 0. NOTE 17—Conversion factors to other commonly used units for corrosion rates are as follows: 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.
A — 10 6. It 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. The corrosion rates should be reported as millimetres of penetration per month Note 8calculated as follows: Use of Etch Structure Classi? Specimens having acceptable etch structures need not be subjected to the hot acid test.
If dry abrasive paper is used, polish slowly to avoid overheating. This specification covers the standard practices for detecting susceptibility to intergranular aetm in austenitic stainless steels. Historical Version asym – view previous versions of standard.
The bent samples are examined at low magnification, where the appearance of cracks or fissures indicate intergranular attack. Because it can be run quickly for screening, we often run this test first. Originally approved in Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
D Specimens from welded tubes over 38 mm 1?
It is also sometimes used to check the effectiveness of stabilizing elements and of reductions in carbon content in preventing susceptibility to rapid intergranular attack. In cases that appear to be dual structures, more extensive examination is required to determine if there are any grains completely encircled.
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. However, any susceptibility to intergranular attack is readily detected by pronounced ditches.