ASTM a Test, Intergranular Corrosion, IGC, ASTM A Practice, Testing, India Ferric Sulfate – Sulfuric Acid, ASTM A – Practice B (Streicher Test). ASTM A practice – Free download as Excel Spreadsheet .xls /.xlsx), PDF File .pdf), Text File .txt) or read online for free. ASTM A Practice B test. In this test a sample of surface area cm. 2 is exposed for a period of hours to boiling solution of 50% H2SO4 + %.
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All austenitic stainless steels should meet this requirement, if proper annealing took place. To understand intergranular corrosion testing or intergranular attack commonly abbreviated as IGC or IGAit is important to understand what causes the process to occur. See Appendix X1 for information regarding test selection.
For example, in highly oxidizing solutions, intergranular attack can occur due to intermetallic phases, while attack of carbides may occur somewhat less oxidizing solutions. Some specific hazards statements are given in We provide intergranular corrosion evaluation, salt spray testing, stress corrosion, and various other methods to simulate exposure of your products or materials to corrosive environments.
Wilson Hardness Conversion Chart.
How do you select the right ASTM corrosion testing method for your material? ASTM A is a common intergranular corrosion testing method that can quickly screen batches of material to determine corrosion susceptibility. 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 is generally performed for acceptance of materials, but not sufficient for rejection of materials.
ASTM A Intergranular Corrosion Testing and Analysis
Choosing an Intergranular Corrosion Test Method Since high temperature processing such as heat treatment is a common practice, many manufacturers wish to perform intergranular corrosion qualification testing on each batch, to ensure that the material has been processed correctly and does not show signs of corrosion susceptibility.
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 Copper Sulfate Test is especially effective for determining susceptibility to intergranular attack for low carbon steels. ASTM A testing is a popular method of choice due to the variety of practices available and the relatively short turnaround for results.
This method is a hour boiling test for “as received” specimens of stainless steel.
Choosing the correct method s rely on a complete understanding of your material and processes, as well as the concept of corrosion itself. Share on Tumblr Print.
Intergranular Corrosion Testing: An Overview of ASTM A262
Discover perspectives, resources, and advice from our world-leading Engaged Experts. Our knowledgeable scientists have the experience and expertise necessary to determine the most appropriate intergranular attack testing methods for your material while providing actionable results you can rely on.
A bend test followed by a visual or micro-examination are used to determine “Pass” or “Fail” of test specimens. Strauss test specimens are boiled in a Copper Sulfate – Sulfuric Acid mixture for 15 hours.
The inch-pound equivalents are in parentheses and may be approximate. Due to the variance of attack in different materials, numerous methods Practices B-F are used to assess intergranular corrosion.
Please refer to the specification for more details. Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: 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. Work Item s – proposed revisions of this standard.
Each ASTM A Practice specification includes a list of the grades of stainless steels and the acceptable etch structures for the specific alloys. Typical examination magnification is X to X. This simple etching technique is used as a quick screening method to ensure that a material is free of intergranular corrosion susceptibility. This specification covers the standard practices for detecting susceptibility to intergranular attack in austenitic stainless steels. In many cases we can reduce that to as little as 24 hours more than the required testing time if you need fast results.
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.
The Oxalic Acid test is also only applicable to corrosion associated with chromium carbide precipitates and is only useful for specific material grades. This abstract is a brief summary of the referenced standard. 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.
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. 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.
Contact us now for pricing or a quote! The samples are weighed at practicr interval to determine mass loss and degree of susceptibility to intergranular attack.
Based on your materials, application, and requirements, the other 4 methods provide specific focuses. The etch structure types used to classify the specimens are: