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  • ASTM
    A262-13 Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
    Edition: 2013
    $113.57
    Unlimited Users per year

Description of ASTM-A262 2013

ASTM A262 - 13

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

Active Standard ASTM A262 | Developed by Subcommittee: A01.14

Book of Standards Volume: 01.03




ASTM A262

Abstract

This specification covers the standard practices for detecting susceptibility to intergranular attack in austenitic stainless steels. These practices include five intergranular corrosion tests, namely: (1) oxalic acid etch test for classification of etch structures of austenitic stainless steels; (2) ferric sulfate-sulfuric acid test, (3) nitric acid test and (4) copper-copper sulfate-sulfuric acid test for detecting susceptibility to intergranular attack in austenitic stainless steels; and (5) copper-copper sulfate-50% sulfuric acid test for detecting susceptibility to intergranular attack in molybdenum-bearing cast austenitic stainless steels. 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. The etch structure types used to classify the specimens are: step structure, dual structure, ditch structure, isolated ferrite, interdendritic ditches, end-grain pitting I, and end-grain pitting II.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

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),

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

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

1.1.4 Practice E CopperCopper SulfateSulfuric Acid Test for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels (Sections 22 to 31 , inclusive), and

1.1.5 Practice F CopperCopper Sulfate50?% Sulfuric Acid Test for Detecting Susceptibility to Intergranular Attack in Molybdenum-Bearing Austenitic Stainless Steels (Sections 32 to 38 , inclusive).

1.2 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 etch test is applicable only to those grades listed in the individual hot acid tests and classifies the specimens either as acceptable or as suspect.

1.3 The ferric sulfatesulfuric acid test, the coppercopper sulfate50?% 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 coppercopper sulfate16?% sulfuric acid test is based on visual examination of bend specimens and, therefore, classifies the specimens only as acceptable or nonacceptable.

Note 1 See Appendix X1 for information regarding test selection.

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

1.5 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 .)


2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ISO Standard

ISO3651-2 Determination of Resistance to Intergranular Corrosion of Stainless Steels--Part 2: Ferritic, Austenitic, and Ferritic-Austenitic (Duplex) Stainless Steels--Corrosion Test in Media Containing Sulfuric Acid

ASTM Standards

A370 Test Methods and Definitions for Mechanical Testing of Steel Products


Keywords

austenitic stainless steel; copper sulfate; corrosion testing; etch structures; ferric sulfate; intergranular corrosion; nitric acid; oxalic acid;


ICS Code

ICS Number Code 77.140.20 (Steels of high quality)


DOI: 10.1520/A0262

ASTM International is a member of CrossRef.

ASTM A262

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ASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide.
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