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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The weight loss is calculated after each step, and reveals if the sample has been properly heat-treated. The effect of post weld surface treatments on the ashm resistance of super duplex stainless steel welds in sea water ISO is specifically for duplex and all austenitic stainless steels, and recommends ageing at two different temperatures: ASTM G28 was designed for nickel-based alloys, and a list of applicable alloys for methods A and B is in the standard.

ASTM A Testing: An Overview of Intergranular Corrosion | Element

The samples are weighed at each interval to determine mass loss and degree of susceptibility to intergranular attack. Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: 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.

Since high temperature processing such as heat treatment is a common practice, many manufacturers wish to 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. G2MT Labs is one of the few labs to offer all five ASTM A corrosion testing practices, as well as the expertise to help you determine which tests to use, what to do if a test fails, and other corrosion consulting as needed.


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Suggested test methods for different corrosion resistant alloys. Metals like stainless steels and aluminum contain elements such as niobium and chromium, often integrated because of their natural corrosion resistance.

R Baboian, Corrosion Tests and Standards: If the structure is acceptable no additional testing is required. This website uses cookies to improve user experience. Where a standard is included in a purchase specification, this must be followed, although it is advised that unsuitable tests, such as the Huey test for duplex and super austenitic stainless steels, are queried. Due to the variance of zstm in different materials, numerous methods Practices B-F are used to assess intergranular corrosion.

These tests do not provide a basis for predicting resistance to forms of corrosion other than intergranular, such as general corrosion, pitting, or stress-corrosion cracking.

Intergranular Attack – ASTM A – Colorado-Metallurgical-Services

Contact us now for pricing or a quote! SEP also gives guidance on which of its methods apply to which alloys: Intergranular simply means that the corrosion is taking place between the grains or crystals, which is where sigma phase or chromium carbides are going to form which makes the material susceptible to IGA. Duplicate samples from both sides of a sheet sample are evaluated to determine if carburization results in intergranular attack.

ASTM G28 lists alloys and specifies the test exposure for each. Make an Enquiry Notice: Please refer to the specification for more details.


This specification is for detecting susceptibility to intergranular attack IGA.

Intergranular Corrosion Testing: An Overview of ASTM A262

Our knowledgeable scientists have the experience and expertise necessary to determine the most appropriate intergranular attack testing methods for your material while providing actionable results you can rely on. ASTM G28 does not require samples to be heat treated.

Link to Active This link will always route to the current Active version of the standard. How do you select the right ASTM corrosion testing method for your material? ASTM G28 method B is a more aggressive test than method Ast, and is intended for more corrosion resistant alloys, as listed in the document. This practice includes boiling the sample for 24 to hours in the solution above, and measures the materials performance quantitatively.

It has been used for the duplex stainless steel UNS Swhich has been used for nitric adtm cooler tubes. Classification of structure then provides either acceptance or further testing required, which typically moves you to one of the next practices. For example, many low-carbon and stabilized stainless steels e.

For an alloy that is not listed, look for an alloy with a similar composition to a listed alloy to determine the most suitable test. All austenitic stainless steels should meet this requirement, if proper annealing took place.