Stress Corrosion Cracking Test

Stress Corrosion Cracking Test Methods

Stress Corrosion Cracking (SCC) is the term used to describe the cracking or fracture failure of metallic materials when stress and a certain medium are present. Commonly used metallic materials in engineering, such as stainless steel, carbon steel, high-strength steel, etc., may face SCC in a specific medium, and according to the harsh degree of corrosion conditions, the material can fail in a few minutes or years. Microcracks develop in the material during corrosion before growing into macroscopic cracks. 

Laboratory stress corrosion cracking tests include:

• ASTM G139: Determining Stress-Corrosion Cracking Resistance of Heat-Treatable Aluminum Alloy Products Using Breaking Load Method.
• ASTM G103: Evaluating Stress-Corrosion Cracking Resistance of Low Copper 7XXX Series Al-Zn-Mg-Cu Alloys in Boiling 6 % Sodium Chloride Solution.
• ASTM G129: Slow Strain Rate Testing to Evaluate the Susceptibility of Metallic Materials to Environmentally Assisted Cracking.
• ASTM G35: Determining the Susceptibility of Stainless Steels and Related Nickel-Chromium-Iron Alloys to Stress-Corrosion Cracking in Polythionic Acids.
• ASTM G36: Evaluating Stress-Corrosion-Cracking Resistance of Metals and Alloys in a Boiling Magnesium Chloride Solution.
• ASTM G37: Use Mattson’s Solution of pH 7.2 to Evaluate the Stress-Corrosion Cracking Susceptibility of Copper-Zinc Alloys.
• ASTM G41: Determining Cracking Susceptibility of Metals Exposed Under Stress to a Hot Salt Environment.
• ASTM G47: Determining Susceptibility to Stress-Corrosion Cracking of 2XXX and 7XXX Aluminum Alloy Products.

Industrial Uses of Stress Corrosion Cracking Test:

• The industrial uses of Stress Corrosion cracking tests are numerous and varied. 
• This test is used to measure the susceptibility of a material to corrosion-related failure. 
• It is an important tool for assessing the performance of materials in service and is often used to determine the life expectancy of components in industrial applications. For example, in the petrochemical industry, the stress corrosion cracking test can be used to assess the performance of pipes and pressure vessels used in the transport and storage of oil and gas. 
• This test can also be used to assess the weldability of components used in pipeline construction. The results of the test provide information about the mechanical properties of the material and its resistance to corrosion-related failure.