Intergranular Corrosion Test (IGC) per ASTM A At TCR Engineering Services, several methods exist for the testing of intergranular corrosion. To conduct. Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels. ASTM A is the specification which governs five practices used to determine if the. Abstract. A detailed study of AISI and stainless steels (SSs) has been conducted to correlate the degree of sensitization (DOS) measured by the.

Author: Migal Goltizahn
Country: Bolivia
Language: English (Spanish)
Genre: Sex
Published (Last): 15 October 2012
Pages: 326
PDF File Size: 4.21 Mb
ePub File Size: 20.22 Mb
ISBN: 755-9-34649-945-1
Downloads: 4569
Price: Free* [*Free Regsitration Required]
Uploader: Nijar

The most convenient size is often a cylinder 10mm w262 by mm long, but other dimensions are possible to suit particular product forms. Learn more about our laboratories – where they are located; the unique capabilities they have and how they can help you solve your technical and commercial challenges.

ISO is the most rigorous in terms of defining test methods, and says which alloys should use which test methods as follows: What is your typical turnaround time? This document also points out which alloys the tests are intended for, and recommends the most appropriate test when none is specified.

Typical examination magnification is X to X. These tests are often run as a qualification test to atsm each batch of stainless steel is properly prepared. Please refer to the specification for more details. The test uses a visual inspection of the surface of the bent specimen to determine pass or fail.

G2MT Laboratories

Suggested test methods for different corrosion resistant alloys. The exception to this is ASTM G28 method A, where rates for the onset of intergranular corrosion are described in reference 1. SEP also gives guidance on which of its methods apply to which alloys: The samples are etched after metallographic preparation for cross-sectional examination which is thoroughly viewed with a traverse from inside to outside diameters of rods and tubes, from face to face on plates, and across all zones such as weld metal, weld-affected zones, and base plates on specimens containing welds.


All five methods within this specification involve exposing specimens to a chemical mixture designed to encourage corrosive behavior. Please share this page: This method is preferable for chromium depletions and corrosion in intermetallic phases.

ASTM A testing is a popular method of choice due to the variety of practices available and the relatively short turnaround for results. None of these are identical and cross substitution of results is not possible.

Selection of a Test A62 The test methods in Table 1 were designed with specific alloys in mind, but the proliferation of new CRAs has meant that the selection of a suitable test method is difficult.

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.

Intergranular Corrosion Testing: An Overview of ASTM A262

The Tests Table 1 below shows the various methods for four common standards: Make an Enquiry Notice: Get in Touch Contact us by Phone or Email to find out how we satm help your industry. There are other requirements in these standards over details that are not discussed in this document, and these should be followed, such as conducting bend tests. All bend tests require a tensile test machine or similar, with suitable grips and sufficient strength to bend the strongest alloy.


Intergranular corrosion is the proper use, though the specification calls it attack, corrosion is what is taking place.

Intergranular Corrosion Tests for CRAs

Vickers Hardness 5Kg and 10Kg. In SEM analysis, intergranular corrosion is clear by the dark lines where the grain boundaries are eaten away. Contact us by Phone or Email to find out how we can help your industry.

Test Samples Samples may be rectangular or cylindrical to suit the test vessel, but where a2622 bend test is required, it is suggested that the sample be a minimum of mm long. Contact us now for pricing or a quote! For alloys not listed in this standard, it will be necessary to carry out some tests on material in various conditions to determine the threshold.

Intergranular Attack – ASTM A – Colorado-Metallurgical-Services

ASTM G28 lists alloys and specifies the test exposure for each. As 15 hours is a difficult test period in practice, and is only a ashm, conducting the test for 20 hours overnight means that the two tests are equivalent. By using our website you consent to all cookies in accordance with our Cookie Policy.

This specification is for detecting susceptibility to intergranular attack IGA. The chart below comes from the ASTM A standard for selection of the appropriate test by alloy type:. Classification of the structure after A Practice A analysis will determine if the material is acceptable or if additional testing is required. The latter is a German test, but it is often called up in European projects.

Author: admin