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What is Yield Strength?
Yield strength, in relation to OCTG, refers to the maximum stress or load that a material can withstand before it undergoes deformation or starts to exhibit plastic behavior. It is an essential mechanical property that indicates the material’s ability to resist deformation under applied stress.
Yield strength is typically measured using a tensile test, also known as a tension test. This test involves subjecting a specimen of material, such as a small section of OCTG casing or tubing, to an applied force or lead in tension until it undergoes deformation.
During the tensile test, the specimen is placed in a testing machine, commonly known as a universal testing machine. The machine applies a gradually increasing tensile force to the specimen, causing it to elongate until it reaches the point of yield. The force and the resulting elongation or deformation are continuously measured throughout the test.
Once the yield strength is determined, it serves as a parameter useful in assessing its suitability for various well conditions and it’s ability to withstand applied loads and pressures in oil and gas wells. The yield strength value is typically reported in units of force per unit area, such as pounds per square inch (psi) or 1,000 pounds per square inch (ksi). Generally, the higher the yield strength the greater the ability to withstand applied loads, higher pressures, more severe downhole conditions.