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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Some specific hazards statements are given in 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.
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. B One surface shall be an original surface of the material under test and it shall be on the outside of the bend.
ASTM A Intergranular Corrosion Testing and Analysis
This may cause rapid intergranular ashm in the nitric acid test. Your comments will receive careful consideration at a meeting of the responsible technical committee,1 which you may attend. The test uses a visual inspection of the surface of the bent specimen to determine pass or fail.
Duplicate samples from both sides of a sheet sample are evaluated to determine if carburization results in intergranular attack.
Link to Active This link will always route to the current Active s262-10 of the standard. A convenient specimen size is 25 by 25 mm 1 by 1 in.
An equivalent area of copper shot or chips may be used. All specimens having nonacceptable etch structures must be tested in the ferric sulfate-sulfuric acid test.
When the available length is less than 1 cm, a full cross section should be used. Add the acid slowly to the water in the Erlenmeyer? These practices include five intergranular corrosion tests, namely: It should have three or four holes to increase circulation of the testing solution around the specimen.
ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
It does not detect susceptibility associated This or a greater concentration of end grain pits at using standard etching conditions indicates that the specimen must be tested when screening is for nitric acid test.
Fresh test solution would not be needed if the test were to run 48 or even 72 h. Preparation, etching, and the classi? Current edition approved April 1, The etch structure types used to classify the specimens are: Millimetres per month 3 0. Please share this page: In cases that appear to be dual structures, more extensive examination is required to determine if there are any grains completely encircled.
However, any susceptibility to intergranular attack is readily detected by pronounced ditches. 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 trip balance may be used. Therefore, the preferred sample is a cross section including the surface to be exposed in service.
Such treatment of test specimens is not permissible, except in tests undertaken to demonstrate such effects.
Steps between austenite matrix and ferrite pools. Specimens having nonacceptable etch structures must be tested in the speci? Such weight-loss determinations should be made with the accuracy prescribed in See Appendix X1 for information regarding xstm selection.
It is not permissible, for example, to conduct nitric-hydro? The test evaluates the resistance of extra-low-carbon steels to sensitization and intergranular attack from welding or heat treatment processes. As an alternative, when the test is being used for inspection prior to approval of steel for shipment, a procedure may be agreed upon by the purchaser and the manufacturer whereby the material will be released for shipment following satisfactory performance in three h boiling periods with?
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. However, the use of at least two specimens for check purposes is recommended. Whenever practical, a polished area of 1 cm2 or more is desirable.