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.

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This test should be avoided for most CRAs, except in the circumstances described below, in section 4. This document describes all three of these tests for four common standards, and describes the differences. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

This practice includes boiling the sample for 24 to hours in the solution above, and measures the materials performance quantitatively. The etch structure types used to classify the specimens are: What is your typical turnaround time? Share on Tumblr Print.

The latter is a German test, but it is astj called up in European projects. ISO is the most rigorous in terms of defining test methods, and says which alloys should use which test methods as follows: More suitable alternatives are offered in Table 5, below. ASTM G28 does not require samples to be heat a622. The bent samples are examined at asym magnification, where the appearance of cracks or fissures indicate intergranular attack. The oxalic acid test is commonly used before the Strauss test to determine if a sample is susceptible; samples that pass method A will generally show low corrosion rates in the Strauss test.


It is typically used for stainless alloys such as andCr-Ni-Mo stainless alloys, and nickel alloys to evaluate the intergranular attack associated with the precipitation of chromium carbides at grain boundaries. Link to Active This link will always route to the current Active version of the standard.

The most convenient size q262 often a cylinder 10mm diameter by mm long, but other dimensions are possible adtm suit particular product forms. Each ASTM A Practice specification includes a list of the grades of stainless steels and the acceptable etch structures for the specific alloys. These practices include five intergranular corrosion tests, namely: Duplicate samples from both sides of a sheet sample are evaluated to determine if carburization results in intergranular attack.

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.

For many alloys, the onset is at 0.

Intergranular Corrosion Testing: An Overview of ASTM A262

Why were these tests designed? Like what you saw?

These tests were introduced when the carbon content in CRAs typically hit 0. This website uses cookies to improve user experience. ASTM G28 lists alloys and specifies the test exposure for each.

ASTM A Intergranular Corrosion Testing and Analysis

Contact us now for pricing or a quote! Since high temperature processing such as heat treatment is a common practice, many manufacturers wish a2262 perform intergranular corrosion qualification testing on each batch, to ensure that the material has been processed correctly and does not show signs of corrosion susceptibility.


SEP does not require ageing, although it might be required in a specification calling up this standard.

All austenitic stainless steels should meet this requirement, if proper annealing took place. There are a number of recognised tests when it comes to the intergranular corrosion testing of corrosion resistant alloys CRA. This document also points out which alloys the tests are intended for, and recommends the most appropriate test when none is specified.

Hence, it is normally only used for stainless steels intended for nuclear service, or another application involving nitric acid.

ASTM G28 was designed for nickel-based alloys, and a list of applicable alloys for methods A and B is in the standard. Because it can be run quickly for screening, we often run this test first. A recent publication on intergranular corrosion. As 15 hours is a difficult test period in practice, and is only a minimum, conducting the test for 20 hours overnight means that the two tests are equivalent. The test uses a visual inspection of the surface of the bent specimen to determine pass or fail.

From macroscopic imaging to Scanning Electron Microscopy, Element provides turnkey metallographic services using state-of-the-art equipment. Rockwell or Superficial Hardness. By using our website you consent to all cookies in accordance with our Cookie Policy.

The Copper Sulfate Test is especially effective for determining susceptibility to intergranular attack for low carbon steels.