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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Each ASTM A Practice specification includes a list of the grades of stainless steels and the acceptable etch structures for the specific alloys.
Resistance to Intergranular Corrosion of Austenitic Stainless Steels
This practice includes boiling the sample for 24 to hours in the solution above, and measures the materials performance quantitatively. Because it can be run quickly for screening, we often run this test first.
Work Item s – proposed revisions of this standard. Some specific hazards statements are given in How do you select the right ASTM corrosion testing method for your material?
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. Share on Tumblr Print.
Intergranular corrosion shows up as the dark black lines around the grain boundaries. In everyday applications, corrosion varies by materials and solutions. Practice A, the oxalic acid etch test is used as a rapid technique to screen samples of certain stainless steel s262-13 to ensure they are not susceptible to intergranular attack sensitization. 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.
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 to help find batches that are incorrectly processed.
Please specify the maximum allowable corrosion rate and any available data on the sensitizing heat treatment performed. The bent samples are examined at low magnification, where the appearance of cracks or fissures indicate intergranular attack.
The test evaluates the resistance of extra-low-carbon steels to sensitization and intergranular attack from welding or heat treatment processes. It is typically used for stainless alloys such a262-113 andCr-Ni-Mo stainless alloys, and nickel alloys to satm the intergranular attack associated with the precipitation of chromium carbides at grain boundaries.
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. 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.
Corrosione intergranulare acciai inox austenitici ASTM A
It depends on which Practice is selected, but typically ranges from to days for different tests. These tests are often run as a qualification test to ensure each batch of stainless steel is properly prepared. Contact us now for pricing or a quote!
Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: Due to the variance of attack in different materials, numerous methods Practices B-F are used to assess intergranular corrosion.
For example, in highly oxidizing solutions, intergranular attack s262-13 occur due to intermetallic phases, while attack of carbides may occur somewhat less oxidizing solutions.
ASTM A Intergranular Corrosion Testing and Analysis
qstm 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.
The etch structure types used to classify the specimens are: For example, many low-carbon and stabilized stainless steels e. Asstm test uses a visual inspection of the surface of the bent specimen to determine pass or fail.
This specification covers the standard practices for detecting susceptibility to intergranular attack in austenitic stainless steels. 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.
These tests do not provide a basis for predicting resistance a262-113 forms of corrosion other than intergranular, such as general corrosion, pitting, or stress-corrosion cracking. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
The chart below comes from the ASTM A standard for a26213 of the appropriate test by alloy type:.
What is your typical turnaround time? Please share this page: Like what you saw? If you are not sure, please contact us for assistance. Practice F, is a hour adtm based analysis that provides a quantitative measure of the materials performance, and is commonly used to analyze as-received stainless steels.