Abstract. A detailed study of AISI and stainless steels (SSs) has been conducted to correlate the degree of sensitization (DOS) measured by the. ASTM a Test, Intergranular Corrosion, IGC, ASTM A Practice, Copper – Copper Sulfate – 16% sulfuric acid, ASTM A – Practice E (Strauss Test). ASTM A Practice E test. This practice describes the procedure by which the copper-copper sulfate% sulfuric acid test is conducted to determine .

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See Appendix X1 for information regarding test selection. The Strauss test is commonly pdactice 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.

The corrosion test has the advantage of being relatively rapid, requiring 24 hours plus sample preparation time.

ASTM A Testing: An Overview of Intergranular Corrosion | Element

It is not sensitive to size asrm orientation, provided that edge attack is not ignored. What is your typical turnaround time? Duplicate samples from both sides of a sheet sample are evaluated to determine if carburization results in intergranular attack. Based on your materials, application, and requirements, the other 4 methods provide specific focuses. To understand intergranular corrosion testing or intergranular attack commonly abbreviated as IGC or IGAit is important to understand what causes the process to occur.

News Project Details Tools. Please specify the maximum allowable corrosion rate and any available data on the sensitizing heat treatment performed. Each ASTM A Practice specification includes a list of the grades of stainless steels and the acceptable etch structures for the specific alloys. 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.


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Intergranular Corrosion Testing: An Overview of ASTM A262

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.

In everyday applications, corrosion varies by materials and practtice. ASTM A testing is a popular method of choice due to the variety of practices available and the relatively short turnaround for results.

Intergranular corrosion shows up as the dark black lines around the grain boundaries. This specification covers the standard practices for detecting susceptibility to intergranular attack in austenitic stainless steels. This xstm is a hour boiling test for “as received” specimens of stainless steel.

Intergranular cracking or crazing is evidence of susceptibility. Classification of the structure after A Practice A analysis will determine if the material 2a62 acceptable or if additional testing is required. A suitable sample of an austenitic stainless steel is exposed to boiling acidified copper sulfate solution for 15 hours.

ASTM A Intergranular Corrosion Testing and Analysis

A bend test followed by a visual or micro-examination are used to determine “Pass” or “Fail” of test specimens. Our knowledgeable scientists have the experience and expertise necessary to determine the most appropriate intergranular attack testing methods for your material while providing actionable awtm you can rely on. Discover perspectives, resources, and advice from our world-leading Engaged Experts.

The samples are weighed at each interval to determine mass loss and degree of susceptibility to intergranular attack. Astj what you saw?

Edges shall be rounded and a fine final polish is required at all surface exclude the weld cap and root area. These tests are often run as a qualification test to ensure each batch of stainless steel is properly prepared. Learn more about our laboratories – where they are located; the unique capabilities they have and how they can help you solve your technical and commercial challenges. A different ASTM A test method must be used to quantify the level of corrosion or to disqualify a material for use.


Contact us now for pricing or a quote! All five methods within this specification involve exposing specimens to a chemical mixture designed to encourage corrosive behavior. The test evaluates the resistance of extra-low-carbon steels to sensitization and intergranular attack from welding or heat treatment processes. By using our website you consent to all cookies in accordance with our Cookie Policy.

The Oxalic Acid test is also only applicable to corrosion associated with chromium carbide precipitates and is only useful for specific material grades.

This method is preferable for chromium depletions and corrosion in intermetallic phases. Our laboratory is well organized, adequately equipped, pdactice have competent staff who are trained to conduct these tests. The chart below comes from the ASTM A standard for selection of the appropriate test by pratcice type:. 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. How do you select the right ASTM corrosion testing method for your material?

Corrosion Tests are conducted to determine the resistance of a metal to chemical attack. The test is generally performed for acceptance of materials, but not sufficient for rejection of materials.

Please refer to the specification for more details.