Corrosion behavior of 316L stainless steel weld under constant strain

Abstract

316L stainless steel is widely used in the fields of thermonuclear industry and petrochemical industry due to its excellent comprehensive mechanical properties and corrosion resistance. Especially in the petroleum industry, 316L stainless steel is commonly used as oil pipelines and storage tanks because of its high corrosion resistance to media such as CO2. However, Petroleum and natural gas generally contain corrosive media, such as high concentrations Cl-, CO2, H2S. When petroleum pipelines work in such a strong corrosion environment for a long time, pitting corrosion or stress corrosion cracking is easy to occur, and these corrosion behaviors preferentially occur in defects such as welds and heat-affected zones. Therefore, in order to ensure the safety and durability of oil and gas export process, it is necessary to study the stress corrosion cracking sensitivity of oil and gas pipeline, especially the stress corrosion sensitivity of oil and gas pipeline weld seam, heat affected zone and other defects. the paper uses three-point bending loading method, and the corrosion morphology of the sample is analyzed by optical microscope. Researching 316L stainless steel weld corrosion behaviors under constant strain.