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 SEM analysis, intergranular corrosion is clear by the dark lines where the grain boundaries are eaten away. In many cases we can reduce that to a2622-13 little as 24 hours more than the required testing time if you need fast results.
Please share this page: Practice F, is a hour weight-loss based analysis that provides a quantitative measure of the materials performance, and is commonly used to analyze as-received stainless steels.
These practices include five intergranular corrosion tests, namely: The inch-pound equivalents are in parentheses and may be approximate. Classification of the structure after A Practice A analysis will determine if the material is acceptable or if additional testing is required.
Intergranular corrosion shows up as the dark black lines around the grain boundaries. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Like what you saw?
Practice A, the oxalic acid etch test is used as a rapid technique to screen samples of certain stainless steel grades to ensure they are not susceptible to intergranular attack sensitization.
Historical Version s – view previous versions of standard Work Item s – atsm revisions of this standard Translated Version s: If you are not sure, please contact us for assistance.
Resistance to Intergranular Corrosion of Austenitic Stainless Steels
Each ASTM A Practice specification includes a list of the grades of stainless steels and the acceptable etch structures for the specific alloys. The chart below comes from the ASTM A standard for selection of the appropriate test by alloy type:.
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. 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.
ASTM A Intergranular Corrosion Testing and Analysis
Duplicate samples from both sides of a sheet sample are evaluated to determine if carburization results in intergranular attack. These tests are often run as a qualification test to ensure each batch of stainless steel is properly prepared. The test uses a visual inspection of aastm surface of the bent specimen qstm determine pass or fail. Historical Version s – view previous versions of standard.
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.
The test evaluates the resistance of extra-low-carbon steels to sensitization and intergranular attack from welding or heat treatment processes. Please specify the maximum allowable corrosion rate and any available data on the sensitizing heat treatment performed. The Huey test works well to analyze chromium depleted regions and intermetallic precipitates, such asym sigma phase, and is also used for materials in strongly oxidizing environments such as nitric acid. G2MT Labs is one of the a22-13 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.
Corrosione intergranulare acciai inox austenitici ASTM A
Share on Tumblr Print. These tests astj not provide a basis for predicting resistance to forms of corrosion other than intergranular, such as general corrosion, pitting, or stress-corrosion cracking. 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 materials; ASTM A is a screening test a22-13 help find batches that are incorrectly processed. Practice B, also known as the Streicher test, uses weight loss analysis to provide a quantitative measure of the materials performance.
The etch structure types used to classify the specimens are: Xstm 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. Intergranular corrosion occurs as a result of precipitation of nitridesa226-13and other intermetallic phasessuch as sigma phase, that occurs along the grain boundaries.
In everyday applications, corrosion varies by materials and solutions.
The test is generally performed for acceptance of materials, but not sufficient for rejection of materials. For example, many low-carbon and stabilized stainless steels e. Due to the variance of attack in different materials, numerous methods Practices B-F are used to assess intergranular corrosion.
A recent publication on intergranular corrosion. The bent samples are examined at low magnification, where the appearance of cracks or fissures indicate intergranular attack. What is your typical turnaround time? 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 aastm grain boundaries.
Work Item s – proposed revisions of this standard. Some specific hazards statements are given in It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. The weight loss is calculated after each step, and reveals if the axtm has been properly heat-treated.
See Appendix X1 for information ast, test selection. It depends on which Practice is selected, but typically ranges from to days for different tests.