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Lasebikan, Bamidaley Ademola
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article
The Mechanical Behavior of a 25Cr Super Duplex Stainless Steel at Elevated Temperature
Abstract
Super duplex stainless steel (SDSS) is a candidate material for production tubing in oil and gas wells and subsea pipelines used to transport corrosive hydrocarbon fluids. The suitability of this material for high temperature applications is examined in this paper.The uniaxial tensile properties are determined for a 25Cr super duplex stainless steel over a range of temperature relevant to high pressure – high temperature oil and gas wells.It is shown that there is a significant effect of temperature on the uniaxial tensile properties.Elevated temperature was shown to reduce the Young’s modulus and increase the strain hardening index; temperature effects on these two parameters are usually neglected in the design of subsea pipelines and oil well tubulars and this could lead to wrong predictions of the collapse pressure. The manufacturing process of the super duplex tubular did not lead to significant anisotropy in the hardness and the ultimate tensile and uniaxial yield strengths.