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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Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
The test is generally performed for sstm of materials, but not sufficient for rejection of materials. The bent samples are examined at low magnification, where the appearance of cracks or fissures indicate intergranular attack.
Practice A, the oxalic acid etch test is used as a rapid technique to screen samples of certain a226-13 steel grades to ensure they are not susceptible to intergranular attack sensitization.
Corrosione intergranulare acciai inox austenitici ASTM A
This abstract is a brief summary of the referenced standard. Practice B, also known as the Streicher test, uses weight loss analysis to provide a quantitative measure of the materials performance.
Intergranular corrosion shows up as the dark black lines around the grain boundaries. The weight loss is calculated after each step, and reveals if the sample has been properly heat-treated. Because it can be run quickly for screening, we often run this test first. 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 chart below comes from the ASTM A standard for selection of the appropriate test by alloy type:. How do you select the right ASTM corrosion testing method for your material? Contact us now for pricing or a quote! In SEM analysis, intergranular corrosion is clear by the dark lines where the grain boundaries are eaten away. Some specific hazards statements are given in Due to the variance of attack in different materials, numerous methods Practices B-F are used to assess intergranular corrosion.
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. Work Item s – proposed revisions of this standard. The inch-pound equivalents are in parentheses and may be approximate.
Link to Active This link will always route to the current Active version of the standard. It depends on which Practice is selected, but typically ranges from to days for different tests. Please specify the maximum allowable corrosion rate and any available data on the sensitizing heat treatment performed.
In everyday applications, corrosion varies by materials and solutions. The test uses a visual inspection of the surface of the bent specimen to determine pass or fail. Please share this page: Each ASTM A Practice specification includes a list of the grades of stainless steels and the acceptable etch structures for the specific alloys.
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 Huey test works well to analyze chromium depleted regions and intermetallic precipitates, such as sigma phase, and is also used for materials in strongly oxidizing environments such axtm nitric acid.
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. 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.
This practice includes boiling the sample for 24 to hours in the solution above, and measures the materials performance quantitatively. Classification of the structure after A Practice A analysis will determine if the material is acceptable or if additional testing is required.
The ASTM A tests can determine if the asrm heat treatment was performed or if the alloys are in danger of intergranular corrosion occurring in use. The etch structure types used to classify the specimens are: For example, in highly oxidizing solutions, intergranular attack can occur due to intermetallic phases, while attack of carbides may occur somewhat less oxidizing solutions.
This specification covers the standard practices for detecting susceptibility to intergranular attack in austenitic stainless steels. See Appendix X1 for information regarding test selection. Share on Tumblr Print. Duplicate samples from both sides of a sheet sample are evaluated to determine if carburization results in intergranular attack.
ASTM A Intergranular Corrosion Testing and Analysis
These tests are often run as a qualification test to ensure each batch of stainless a262-1 is properly prepared. If you are not sure, please contact us for assistance. Practice F, is a hour weight-loss based analysis that provides a quantitative measure asrm the materials performance, and is commonly used to analyze as-received stainless steels.
For example, many low-carbon and stabilized stainless steels e. Like what you saw? Based on your materials, application, and requirements, the other 4 methods provide specific focuses. Historical Version s – view previous versions of standard. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of a26213 limitations prior to use.
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.
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.
G2MT Labs is one of the few a2622-13 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.