ASTM A262-13 PDF
This standard is issued under the fixed designation A ; the number immediately following 1 These practices are under the jurisdiction of ASTM Committee A01 on Steel, containing welds should be cut so that no more than 13 mm (1⁄2. Fast, high-quality ASTM A intergranular corrosion testing run by corrosion experts. ASTM has standardized the test procedure and the specifications are detailed in ASTM A standard (ASTM, ) and ASTM G standard (ASTM.
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In everyday applications, corrosion varies by materials and solutions. In many cases we can reduce that to as little as 24 hours more than the required testing time if you need fast results.
Work Item s – proposed revisions of this standard.
ASTM A Intergranular Corrosion Testing and Analysis
Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: 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. These practices include five intergranular corrosion tests, namely: The chart below comes from the ASTM A standard for selection of the appropriate test by alloy type:.
Due to the variance of attack in different materials, numerous methods Practices B-F are used to assess intergranular corrosion. 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. Each ASTM A Practice specification includes a list of the grades of stainless steels and the acceptable etch structures for the specific alloys.
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. The Strauss test is commonly used to evaluate the heat-treatment of as-received material, the effectiveness of alloying additions of elements such as Nb and Ti, or the effectiveness of reducing carbon content to resist intergranular attack.
Corrosione intergranulare acciai inox austenitici ASTM A
Intergranular corrosion shows up as the dark black lines around the grain boundaries. Please share this page: Because it can be run quickly for screening, we often run this test first. 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.
In SEM analysis, intergranular corrosion is clear by the dark lines where the grain boundaries are eaten away. The Huey test works well to analyze chromium depleted regions and intermetallic precipitates, asfm as sigma phase, and is also used for materials in strongly oxidizing environments such as nitric acid. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
This specification covers the standard practices for detecting susceptibility to intergranular attack in austenitic stainless steels. The inch-pound equivalents are in parentheses and may be approximate.
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. Link to Active This link will always route to the current Active version of the standard. Contact us now for pricing or a quote!
Practice B, also known as the Streicher test, uses weight loss analysis to provide a quantitative measure of the materials performance. Like what you saw? The weight loss is calculated after each step, and reveals if the sample has been properly heat-treated.
The test evaluates the resistance of extra-low-carbon steels to sensitization and intergranular attack from welding or heat treatment processes. The first and fastest step is the ASTM A Practice A, a rapid same-day screening method in Oxalic acid to determine the susceptibility to intergranular corrosion.
Resistance to Intergranular Corrosion of Austenitic Stainless Steels
The etch structure types used to classify the specimens are: Share on Tumblr Print. The test uses a visual inspection of the surface of the bent specimen to determine pass or fail. 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.
Classification of the structure after A Practice A analysis will determine if the material is acceptable or if additional testing is required. If materials with incorrect astk treatment enter service, they are liable to crack or fail by intergranular corrosion IGC much more rapidly than properly treated materials; ASTM A is a screening test to help find batches that are incorrectly processed.
The bent samples are examined at low magnification, where the appearance of cracks or fissures indicate intergranular attack.