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ASTM A262

Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels

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Organization: ASTM
Publication Date: 10 November 2002
Status: inactive
Page Count: 17
ICS Code (Stainless steels): 77.140.20
scope:

(Footnote *)

These practices cover the following five tests:

Practice A - Oxalic Acid Etch Test for Classification of Etch Structures of Austenitic Stainless Steels (Sections 3 to 7, inclusive),

Practice B - Ferric Sulfate-Sulfuric Acid Test for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels (Sections 8 to 14, inclusive),

Practice C - Nitric Acid Test for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels (Sections 15 to 21, inclusive),

Practice E - Copper-Copper Sulfate-Sulfuric Acid Test for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels (Sections 22 to 31, inclusive), and

Practice F - Copper-Copper Sulfate-50 % Sulfuric Acid Test for Detecting Susceptibility to Intergranular Attack in Molybdenum-Bearing Cast Austenitic Stainless Steels (Sections 32 to 38, inclusive).

The following factors govern the application of these practices:

Susceptibility to intergranular attack associated with the precipitation of chromium carbides is readily detected in all six tests.

Sigma phase in wrought chromium-nickel-molybdenum steels, which may or may not be visible in the microstructure, can result in high corrosion rates only in nitric acid.

Sigma phase in titanium or columbium stabilized alloys and cast molybdenum-bearing stainless alloys, which may or may not be visible in the microstructure, can result in high corrosion rates in both the nitric acid and ferric sulfate-sulfuric acid solutions.

The oxalic acid etch test is a rapid method of identifying, by simple etching, those specimens of certain stainless steel grades that are essentially free of susceptibility to intergranular attack associated with chromium carbide precipitates. These specimens will have low corrosion rates in certain corrosion tests and therefore can be eliminated (screened) from testing as "acceptable."

The ferric sulfate-sulfuric acid test, the copper-copper sulfate-50 % sulfuric acid test, and the nitric acid test are based on weight loss determinations and, thus, provide a quantitative measure of the relative performance of specimens evaluated. In contrast, the copper-copper sulfate-16 % sulfuric acid test is based on visual examination of bend specimens and, therefore, classifies the specimens only as acceptable or nonacceptable.

In most cases either the 24-h copper-copper sulfate-16 % sulfuric acid test or the 120-h ferric sulfate-sulfuric acid test, combined with the oxalic acid etch test, will provide the required information in the shortest time. 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 example 316, 316L, 317, and 317L), which represent steel intended for use in nitric acid environments.

The 240-h nitric acid test must be applied to stabilized and molybdenum-bearing grades intended for service in nitric acid and to all stainless steel grades that might be subject to end grain corrosion in nitric acid service.

Only those stainless steel grades are listed in Table 1 for which data on the application of the oxalic acid etch test and on their performance in various quantitative evaluation tests are available.

Extensive test results on various types of stainless steels evaluated by these practices have been published in Ref (1).(Footnote 2)

The values stated in SI units are to be regarded as standard. The inch-pound equivalents are in parentheses and may be approximate.

This standard does not purport to address all of the safety problems, if any, associated with its use. 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. (Specific precautionary statements are given in 5.6, 11.1.1, 11.1.9, and 35.1.)

Footnote * - A Summary of Changes section appears at the end of this standard.

Footnote 2- The boldface numbers in parentheses refer to the list of references found at the end of these practices.

Document History

September 1, 2015
Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
These practices cover the following five tests: Practice A—Oxalic Acid Etch Test for Classification of Etch Structures of Austenitic Stainless Steels (Sections 4 to 13, inclusive), Practice...
July 1, 2014
Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
These practices cover the following five tests: Practice A—Oxalic Acid Etch Test for Classification of Etch Structures of Austenitic Stainless Steels (Sections 4 to 13, inclusive), Practice...
May 1, 2013
Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
These practices cover the following five tests: Practice A-Oxalic Acid Etch Test for Classification of Etch Structures of Austenitic Stainless Steels (Sections 3 to 7, inclusive), Practice B-Ferric...
April 1, 2010
Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
These practices cover the following five tests: Practice A—Oxalic Acid Etch Test for Classification of Etch Structures of Austenitic Stainless Steels (Sections 3 to 7, inclusive), Practice B—Ferric...
November 10, 2002
Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
(Footnote *) These practices cover the following five tests: Practice A - Oxalic Acid Etch Test for Classification of Etch Structures of Austenitic Stainless Steels (Sections 3 to 7, inclusive),...
November 10, 2002
Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
These practices cover the following five tests: Practice A - Oxalic Acid Etch Test for Classification of Etch Structures of Austenitic Stainless Steels (Sections 3 to 7, inclusive), Practice B -...
ASTM A262
November 10, 2002
Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
(Footnote *) These practices cover the following five tests: Practice A - Oxalic Acid Etch Test for Classification of Etch Structures of Austenitic Stainless Steels (Sections 3 to 7, inclusive),...
November 10, 2002
Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
These practices cover the following five tests: Practice A—Oxalic Acid Etch Test for Classification of Etch Structures of Austenitic Stainless Steels (Sections 3 to 7, inclusive), Practice B—Ferric...
November 10, 2002
Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
(Footnote *) These practices cover the following five tests: Practice A - Oxalic Acid Etch Test for Classification of Etch Structures of Austenitic Stainless Steels (Sections 3 to 7, inclusive),...
June 10, 2002
Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
These practices cover the following five tests: Practice A - Oxalic Acid Etch Test for Classification of Etch Structures of Austenitic Stainless Steels (Sections 3 to 7, inclusive), Practice B -...
September 10, 2001
Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
Scope These practices cover the following five tests: Practice A - Oxalic Acid Etch Test for Classification of Etch Structures of Austenitic Stainless Steels (Sections 3 to 7, inclusive), Practice B...
November 10, 1998
Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
1. Scope 1.1 These practices cover the following five tests: 1.1.1 Practice A--Oxalic Acid Etch Test for Classification of Etch Structures of Austenitic Stainless Steels (Sections 3 to 7, inclusive),...
December 15, 1993
Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
A description is not available for this item.
July 15, 1993
STANDARD PRACTICES FOR DETECTING SUSCEPTIBILITY TO INTERGRANULAR ATTACK IN AUSTENITIC STAINLESS STEELS
A description is not available for this item.
December 15, 1991
STANDARD PRACTICES FOR DETECTING SUSCEPTIBILITY TO INTERGRANULAR ATTACK IN AUSTENITIC STAINLESS STEELS
A description is not available for this item.
December 28, 1990
STANDARD PRACTICES FOR DETECTING SUSCEPTIBILITY TO INTERGRANULAR ATTACK IN AUSTENITIC STAINLESS STEELS
A description is not available for this item.
August 29, 1986
STANDARD PRACTICES FOR DETECTING SUSCEPTIBILITY TO INTERGRANULAR ATTACK IN AUSTENITIC STAINLESS STEELS
A description is not available for this item.
October 25, 1985
STANDARD PRACTICES FOR DETECTING SUSCEPTIBILITY TO INTERGRANULAR ATTACK IN AUSTENITIC STAINLESS STEELS
A description is not available for this item.
March 29, 1985
Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
These practices cover the following five tests: Practice A-Oxalic Acid Etch Test for Classification of Etch Structures of Austenitic Stainless Steels (Sections 3 to 7, inclusive), Practice B-Ferric...
July 31, 1981
Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
These practices cover the following five tests: Practice A-Oxalic Acid Etch Test for Classification of Etch Structures of Austenilic Stainless Steels (Sections 2 to 6, incl), Practice B- Ferric...
July 27, 1979
Standard Recommended Practices for DETECTING SUSCEPTIBILITY TO INTERGRANULAR ATTACK IN STAINLESS STEELS
These recommended practices cover the following five tests: Practice A - Oxalic Acid Etch Test for Classification of Etch Structures of Stainless Steels (Sections 2 to 6, incl), Practice B - Ferric...
August 26, 1977
Standard Recommended Practices for Detecting Susceptibility to Intergranular Attack in Stainless Steels
These recommended practices cover the following five tests: Practice A-Oxalic Acid Etch Test for Clauification of Etch Structures of Stainless Steels (Sections 2 to 6, incl), Practice B - Ferric...
July 28, 1970
Standard Recommended Practices for Detecting Susceptibility to Intergranular Attack in Stainless Steels
These practices cover the following five tests: Practice A - Oxalic Acid Etch Test for Classification of Etch Structures of Austenitic Stainless Steels (Sections 3 to 7, inclusive), Practice B -...

References

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