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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ASTM International takes no ashm respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. B One surface shall be an original surface of the material under test and it shall be on the outside of the bend. Deep interconnected ditches 7. The copper should be washed and degreased before use. Also, by mutual agreement, a combination of one h period and two h periods not necessarily in that order instead of?
The ground glass opening is somewhat over 38 mm 11? 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. Normally, the maximum convenient weight of specimen is about g.
Specimens containing welds should be cut so that no more than 13 mm 1? An air or hydraulic press may also be used for bending the specimens. NOTE 18—It may be necessary to embed large specimens, such as from heavy bar stock, in copper shot on the bottom of the test?
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. A visual comparison between these specimens should assist in interpretation. For inspection tests, specimens cut from bars, wires, or tubes should be proportioned so that the areas of the exposed cross sections shall not exceed a262-0 the total exposed area asstm the specimen.
It does not detect susceptibility to intergranular attack associated with sigma phase or end-grain corrosion, both of which have been observed to date only in certain nitric acid environments. Specimens containing welds should be cut so that no more than mm 1? The number 3 or 4 is limited only by the number of glass cradles that can be?
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 ashm.
Duplicate samples from both sides of a sheet sample are evaluated to determine if carburization results in intergranular attack. It may also be used to evaluate the resistance of extra-low-carbon grades to sensitization to intergranular attack caused by welding or heat treatments. Preparation of Test Specimens 5.
The use of the etch structure evaluations in connection with the nitric acid test is speci? Fresh test solution would not be needed if the test were to run 48 or even 72 h. If not 15 h, the test time shall be speci?
All specimens having nonacceptable etch structures must be tested in the nitric acid test.
Because it can be run quickly for screening, we often run this test first. 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. Cold-rolled strip or sheets may be tested in the thickness supplied. Excessive corrosion may often be detected by changes in the color of the test solution, and it may be appropriate to provide separate containers for such specimens without waiting until the end of the test period.
If more than one of the specimens tested in the same container fail to pass the test, it is necessary to retest all specimens in separate containers, since excessive corrosion of one specimen may result in accelerated corrosion of the other specimens tested with it.
D Must be tested in nitric acid test when destined for service in nitric acid. Work Item s – proposed revisions of this standard. Use of Etch Structure Classi? The heat treating is best carried out in air or neutral salt.
Therefore, even though the grain boundaries all have step structures, specimens having as much asrm more end grain pitting than that shown in Fig. A small amount of copper shot 8 to 10 pieces on the bottom of the? These lists may contain grades of steels in addition to those given in the rectangles.
This abstract is a brief summary of the referenced standard. Permission rights to photocopy the standard may also be secured from the ASTM website www. It depends on which Practice is selected, but typically ranges from a2621-0 days for different tests. See Appendix X1 for information regarding test selection. Please specify the maximum allowable corrosion rate and any available data on the sensitizing heat treatment performed.
Whenever practical, a polished area of 1 cm2 or more is desirable. Therefore, the area etched should be kept as small as possible satm at the same time meeting the requirements of desirable minimum area to be etched.
Last previous edition approved in as A — 02a A silicone grease is recommended for the ground glass joint. This will assure detection of intergranular attack resulting from carburization of one surface of sheet material during the? If there is an appreciable change in the level, the test must be repeated with fresh solution and a reground specimen. Such sharp, deep pits should not be confused with the shallow pits shown in Fig.
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.