Corrosion evaluation of 13Cr (AISI 420) stainless steel: synergic effects of environmental factors and microstructure

Kazemipour, Mostafa (2020) Corrosion evaluation of 13Cr (AISI 420) stainless steel: synergic effects of environmental factors and microstructure. Masters thesis, Memorial University of Newfoundland.

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Abstract

13 Cr (AISI 420) martensitic stainless steel, widely used as an oil country tubular goods (OCTG), is sensitive to localized corrosion especially in the harsh downhole environment of oil and gas wells. The corrosion behavior of the material is determined by both the materials' intrinsic characteristics and environmental conditions. Accordingly, in the first part of the study, the corrosion properties of the 13Cr stainless steel were studied using response surface methodology in three different environmental parameters of temperature, pH, and chloride concentration at the ranges of 22-80°C, 4-7, and 1000-22000 mg/Lit. , respectively. The results were provided as a quadratic model correlating the materials pitting potential to the parameters. In the second part, the effect of the microstructure and micro-phase constituents of the steel on its corrosion performance was investigated. The results showed that a defect-free and partially tempered microstructure containing delta ferrite as a highly concentrated region of chromium could have suitable corrosion properties.

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