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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Please specify the maximum allowable corrosion rate and any available data on the sensitizing heat treatment performed. Contact us adtm for pricing or a quote! See Appendix X1 for information regarding test selection. 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 stainless steel grades to ensure they are not susceptible to intergranular attack sensitization. The test is generally performed for asmt of materials, but not sufficient for rejection of materials.
Corrosione intergranulare acciai inox austenitici ASTM A
The chart below comes from the ASTM A standard for selection of the appropriate test by alloy type:. Historical Version adtm – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: The bent samples asym examined at low magnification, where the appearance of cracks or fissures indicate intergranular attack.
If you are not sure, please contact us for assistance. The Huey test works well to analyze chromium a26-213 regions and intermetallic precipitates, such as sigma phase, and is also used for materials in strongly oxidizing environments such as nitric acid. Intergranular corrosion occurs as a result of precipitation of nitridescarbidesand other intermetallic phasessuch as sigma phase, that occurs along the grain boundaries.
For example, many low-carbon and stabilized stainless steels e. What is your typical turnaround time?
Resistance to Intergranular Corrosion of Austenitic Stainless Steels
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. A recent publication on intergranular corrosion. Work Item s – proposed revisions of this standard.
In everyday applications, corrosion varies by materials and solutions. The inch-pound equivalents are in parentheses and astj be approximate.
ASTM A Intergranular Corrosion Testing and Analysis
Intergranular corrosion shows up as the dark black lines around the grain boundaries. 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.
Because it can be run quickly for screening, we often run this test first. This a622-13 covers the standard practices for detecting susceptibility to intergranular attack in austenitic stainless steels. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. This practice includes boiling the sample for 24 to hours in the solution above, and measures the materials performance quantitatively.
In many cases we can reduce that to as little as 24 hours more than the required testing time if you need fast results. 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. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations ast to use.
Like what you saw? Classification of the structure after A Practice A analysis will determine if the material is acceptable or if additional testing is required.
Link to Active This link will always route to the current Active version of the standard. Due to the variance of attack in different materials, numerous methods Practices B-F are used to assess intergranular corrosion.
The ASTM A tests can determine if the proper heat treatment was performed or if the alloys are in danger of intergranular corrosion astn in use. Practice B, also known as the Streicher test, uses weight loss analysis to provide a quantitative measure of the materials performance. 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.
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.