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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Resistance to Intergranular Corrosion of Austenitic Stainless Steels
These tests are often run as a qualification test to ensure each batch of stainless steel is properly prepared. See Appendix X1 for information regarding test selection. The bent samples are examined at low magnification, where the appearance of cracks or fissures indicate intergranular attack. 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.
If you are not sure, please contact us for assistance. A recent publication on intergranular corrosion. The chart below comes from the ASTM A standard for selection of the appropriate test by alloy type:. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Intergranular corrosion shows up as the dark black lines around the grain boundaries. 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 as nitric acid. Practice B, also known as the Streicher test, uses weight loss asm to provide a quantitative measure of the materials performance.
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. 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.
What is your typical turnaround time? Classification of the a262-1 after A Practice A analysis will determine if the material is acceptable or if additional testing is required.
Practice F, is a hour weight-loss based analysis that provides a quantitative measure of the qstm performance, and is commonly used to analyze as-received stainless steels.
A62-13 etch structure types used to classify the specimens are: The inch-pound equivalents are in parentheses and may be approximate.
Please share this page: The ASTM A tests can determine if the proper heat treatment was performed or if the alloys are in danger of intergranular corrosion a2621-3 in use. For example, in highly oxidizing solutions, intergranular attack can occur due to intermetallic phases, while attack of carbides may occur somewhat less oxidizing solutions.
How do you select the right ASTM corrosion testing method for your material? It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
This specification covers the standard practices for detecting susceptibility to intergranular attack in austenitic stainless steels. ASTM does not give any ast express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
Like what you saw? Due to the variance of attack in different materials, numerous methods Practices B-F are used to assess intergranular corrosion. For example, many low-carbon and stabilized stainless steels e.
Intergranular corrosion occurs as a result of precipitation of nitridescarbidesand other intermetallic phasessuch as sigma phase, that occurs along the grain boundaries.
This abstract is a brief summary of the referenced standard. Historical Version s – view previous versions of standard. Because it can be run quickly for screening, we often run this test first.
Share on Tumblr Print. This practice includes boiling the sample for 24 to hours in the solution above, and measures the z262-13 performance quantitatively. Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: Some specific hazards statements are given in Practice A, the oxalic acid etch test is used as a rapid technique to screen samples of certain a26213 steel grades to ensure they are not susceptible to intergranular attack sensitization.
The test evaluates the resistance of extra-low-carbon steels to sensitization and intergranular attack from welding or heat treatment processes.
ASTM A Intergranular Corrosion Testing and Analysis
Each ASTM A Practice specification includes a list of the grades of stainless steels and the acceptable etch structures for the specific alloys. Duplicate samples from both sides of a sheet sample are evaluated to determine if carburization results in intergranular attack. Please specify the maximum allowable corrosion rate and any available data on the sensitizing heat treatment performed. 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.
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.
In everyday applications, corrosion varies by materials and solutions. 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.
It depends on which Practice is selected, but typically ranges from to days for different tests. The weight loss is calculated after each step, and reveals if the sample has been properly heat-treated. These practices include five intergranular corrosion tests, namely: The test uses a visual inspection of the surface of the bent specimen to determine pass or fail.
Work Item s – proposed revisions of this standard. 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 awtm a screening test to help find batches that are incorrectly processed. The test is generally performed for acceptance of materials, but not sufficient for rejection of materials.
Link to Active This link will always route to the current Active version of the standard. Contact us now for pricing or a quote! Based on your materials, application, and requirements, the other 4 methods provide specific focuses. 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.