What is IGC practice a?
Practice A is a microscopic method for determining the susceptibility to IGC due to the precipitation of mainly chromium carbide M23C6 at grain boundary. It detects susceptibility to inter granular attack with mainly M23C6 precipitated at grain boundary in a stabilized austenitic stainless steel.
What is IGC A262 practice E?
Strauss Test (ASTM A262 Practice E) This test is used exclusively to determine corrosion in areas high in chromium carbide formations, and is not as effective for intergranular attack caused by other means. Strauss test specimens are boiled in a Copper Sulfate – Sulfuric Acid mixture for 15 hours.
What is the IGC test?
Intergranular Corrosion (IGC) or Intergranular Attack (IGA), is an efficient test for screening a material’s corrosion resistance under certain conditions. Intergranular corrosion refers to material degradation that occurs along the grain boundaries of metallic materials after exposure to a corrosive environment.
Is IGC applicable for carbon steel?
How to reduce the risk of intergranular corrosion (IGC) Materials with less than 0.05% carbon normally have sufficient resistance against intergranular corrosion after welding. ELC (extra low carbon content) steels, i.e. steels with maximum 0.030% carbon, have very good resistance to intergranular corrosion.
What type of inspection is usually required to detect intergranular corrosion?
Ultrasonic inspection can detect corrosion damage on some surfaces. It is commonly used to detect exfoliation and stress-corrosion cracks.
How is intergranular corrosion treated?
Fortunately, heat treatments can often resolve the issue and return the metal’s structure to a near-original state. In some cases, solution-annealing (also known as quench-annealing or solution-quenching) is an effective means of reversing intergranular corrosion damage in austenitic stainless steels.
How can sensitization in austenitic stainless steel be avoided?
Remedies. There a number of methods of avoiding or repairing sensitisation: Use stainless steel with a low carbon content. The ‘L’ grades have a maximum of 0.03% carbon, and pickled & passivated HAZs are effectively as corrosion resistant as the parent material in most corrosion conditions.
How is intergranular corrosion detected?
Copper-based alloys become sensitive when depletion of copper content in the grain boundaries occurs. Intergranular corrosion induced by environmental stresses is termed stress corrosion cracking. Inter granular corrosion can be detected by ultrasonic and eddy current methods.
How is intergranular corrosion removed How is it inspected?
Intergranular corrosion is inspected by using the NDT method, such as ultrasonic inspections or radiography inspection. It is removed by replacing the part.
