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):||11 February 2018|
|PDF File Size:||14.83 Mb|
|ePub File Size:||20.75 Mb|
|Price:||Free* [*Free Regsitration Required]|
The test evaluates the resistance of extra-low-carbon steels to sensitization and intergranular attack from welding or heat treatment processes. A622-13 practice includes boiling the sample for 24 to hours in the solution above, and measures the materials performance quantitatively.
Resistance to Intergranular Corrosion of Austenitic 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.
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 inch-pound equivalents are in parentheses and may be approximate. 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. 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.
Link to Active This link will always route to the current Active version of the standard. The test is generally performed for acceptance 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. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. A recent publication on intergranular corrosion. Please share this page: 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.
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. The etch structure types used to classify the specimens are: Work Item s – proposed revisions of this standard. 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.
ASTM A Intergranular Corrosion Testing and Analysis
If you are not sure, please contact us for assistance. Due to the variance of attack in different materials, numerous methods Practices B-F are used to assess intergranular corrosion. 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. Some specific hazards statements are given in What is your typical turnaround time?
The test uses a visual inspection of the surface of the bent asmt to determine pass or fail. In everyday applications, corrosion varies by materials and solutions. These practices aa262-13 five intergranular corrosion tests, namely: It depends on which Practice is selected, but typically ranges sstm to days for different tests.
Duplicate samples from both sides of a sheet sample are evaluated to determine if carburization results in intergranular attack.
For example, in highly oxidizing solutions, intergranular attack can occur due to intermetallic phases, while attack qstm carbides may occur somewhat less oxidizing solutions. See Appendix X1 for information regarding test selection.
Historical Version s – view previous versions of standard. These tests are often run as a qualification test to ensure each batch of stainless steel is properly prepared. 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.
How do you select the right ASTM corrosion testing method for your material? This specification covers the standard practices for detecting susceptibility to intergranular attack in austenitic stainless steels. Share on Tumblr Print.
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.
Intergranular corrosion occurs as a result of precipitation of nitridescarbidesand other intermetallic phasessuch as sigma phase, that occurs along the grain boundaries. Classification of the structure after A Practice A analysis will determine if the material is acceptable or if additional testing is required. Methods for preparing the test specimens, rapid screening tests, apparatus setup and testing procedures, and calculations and report contents sstm described for each testing practice.
Practice E, the Strauss test, is performed to assess attack associated with chromium-rich qstm formation; it does not detect susceptibility to sigma phase formation. Historical Version s – view previous versions of axtm Work Item s – proposed revisions of this standard Translated Version s: Contact us now for pricing or a quote!
The weight loss is calculated after each step, and reveals if the sample has been properly heat-treated. 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.
Practice B, also known as the Streicher test, uses weight loss analysis to provide a quantitative measure of the materials performance.