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.
|Published (Last):||22 February 2011|
|PDF File Size:||10.88 Mb|
|ePub File Size:||16.16 Mb|
|Price:||Free* [*Free Regsitration Required]|
The ASTM A tests can determine if the proper heat treatment was performed or if the alloys are in danger of intergranular corrosion occurring in use. The test uses a visual inspection of the surface of the bent specimen to determine pass or fail.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Resistance to Intergranular Corrosion of Austenitic Stainless Steels
Intergranular corrosion occurs as a result of precipitation of nitridescarbidesand other intermetallic phasessuch as sigma phase, that occurs along the grain boundaries.
The test is generally performed for acceptance of materials, but not sufficient for rejection of materials. 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. G2MT Labs is one of the few 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.
These practices include five intergranular corrosion tests, namely: Practice B, also known as the Streicher test, uses weight loss analysis to provide a quantitative measure of the materials performance. Link to Active This link will always route to the current Active version of the standard.
This specification covers the standard practices for detecting susceptibility to intergranular attack in austenitic stainless steels.
Classification of the structure after A Practice A analysis will determine if the material is acceptable or if additional testing is required.
Duplicate samples from both sides of a sheet sample are evaluated to determine if carburization results in intergranular attack. See Appendix X1 for information regarding test selection. These tests are often run as a qualification test to ensure each batch of stainless steel is properly prepared. 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.
The test evaluates the resistance of extra-low-carbon steels to sensitization and intergranular attack from welding or heat treatment processes.
Corrosione intergranulare acciai inox austenitici ASTM A
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 typically used for stainless alloys such as andCr-Ni-Mo stainless alloys, adtm nickel alloys to evaluate the intergranular attack associated with the precipitation of chromium carbides at grain boundaries.
The bent samples are examined at low magnification, where the appearance of cracks or fissures indicate intergranular attack. 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.
Due to the variance of attack in different materials, numerous methods Practices B-F are used to assess intergranular corrosion. In everyday applications, corrosion varies by materials and solutions. Some specific hazards statements are given in Because it can be run quickly for screening, atm often run this test first.
If you are not sure, please contact us for assistance. 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.
Contact us now for pricing or a quote! Please share this page: Please specify the maximum allowable corrosion rate and any available data on the sensitizing heat treatment performed. Historical Version s – view previous versions of standard A62-13 Item s – proposed revisions of this standard Translated Version s: 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 ast, intergranular attack sensitization.
ASTM A Intergranular Corrosion Testing and Analysis
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. 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.
Based on your materials, application, and requirements, the other 4 methods provide specific focuses. 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.
Each ASTM A Practice specification a26-213 a list of the grades of stainless steels and the acceptable etch structures for the specific alloys.