Abstract. A detailed study of AISI and stainless steels (SSs) has been conducted to correlate the degree of sensitization (DOS) measured by the. ASTM a Test, Intergranular Corrosion, IGC, ASTM A Practice, Copper – Copper Sulfate – 16% sulfuric acid, ASTM A – Practice E (Strauss Test). ASTM A Practice E test. This practice describes the procedure by which the copper-copper sulfate% sulfuric acid test is conducted to determine .

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A recent publication on intergranular corrosion. Our Corrosion Test services and capabilities are as follows: Some specific hazards statements are given in If materials with incorrect heat treatment enter service, they are liable to crack or fail by intergranular corrosion IGC much more rapidly than properly treated satm ASTM A is a screening test to help find batches that are incorrectly processed.

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This specification covers the standard practices for detecting susceptibility to intergranular attack in austenitic stainless steels. Similar to the Streicher test, the Huey test method uses a practie acid solution and subjects the specimen to five hour boiling intervals.

Because it can be run quickly for screening, we often run this test first. This website uses cookies to improve user experience. Sensitization causes the grain boundaries of a material to precipitate, creating carbide deposits and causing the material to be susceptible to practce attack. To understand intergranular corrosion testing or intergranular attack commonly abbreviated as IGC or IGAit is important to understand what causes the process to occur. Classification of the structure after A Practice A analysis will determine if the material is acceptable or if additional testing is required.

It depends on which Practice is selected, but typically ranges from to days for different tests. 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.


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. Share on Tumblr Print.

Work Item s – proposed revisions of this standard. In many cases we can reduce that to as little as 24 zstm more than the required testing time if you need fast results. This method is preferable for chromium depletions and corrosion in intermetallic phases.

Practice E, the Strauss test, is performed to assess attack associated with chromium-rich carbide formation; it does not detect susceptibility to sigma phase formation. Metals like stainless steels and aastm contain elements such as niobium and chromium, often integrated because of their natural corrosion resistance. If you are not sure, please contact us for assistance.

The ASTM A tests can determine if the proper heat treatment was performed or if the alloys are in danger of intergranular corrosion occurring in use. ASTM A testing is a popular method of choice due to the variety of practices available and the relatively short turnaround for results.

At the conclusion off the test, specimens are either visually examined or measured for weight loss and compared to an established corrosion rate for that specific material type. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part atsm the standard. Examination of intergranular cracks and fissures on bend surface. Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: Please specify the maximum allowable corrosion rate and any available data on the sensitizing heat treatment performed.


Due to the variance of attack in different materials, numerous methods Practices B-F are used to assess intergranular corrosion.

Intergranular Corrosion Testing: An Overview of ASTM A262

This test is used exclusively to determine corrosion in areas high in chromium carbide formations, and is not as pracgice for intergranular attack caused by other means. It is not sensitive to size or orientation, provided that edge attack is not ignored. Historical Version s – view previous versions of standard.

The test is generally performed for acceptance of materials, but not sufficient for rejection of materials.

Choosing the correct method s rely on a complete understanding of your material and processes, as well as the concept of corrosion itself. It is the prsctice of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

ASTM A Testing: An Overview of Intergranular Corrosion | Element

This abstract is a brief summary of the referenced standard. Intergranular corrosion occurs as a result of precipitation of nitridescarbidesand other intermetallic phasessuch as sigma phase, that occurs along the grain boundaries. This method is a hour boiling test for “as aetm specimens of stainless steel.

The first and fastest step is the ASTM A Practice A, a rapid same-day ast, method in Oxalic acid to determine the susceptibility to intergranular corrosion.

Sample condition before soaking in Ferric chloride solution. Bend Specimen after soaking. News Project Details Tools. Our laboratory is well organized, adequately equipped, and have competent staff who are trained to conduct these tests.

This test method does not determine the critical pitting temperature or test for the suitability for use in a particular environment.