Stainless steel can be divided into Cr stainless steel, Cr-Ni stainless steel, Cr-Ni-Mo stainless steel according to chemical composition, and can be divided into medical stainless steel, atmospheric corrosion-resistant stainless steel, oxidation-resistant stainless steel, Cl-corrosion-resistant stainless steel, etc. according to the application fields. But the most commonly used classification is based on the structure of the steel, which can generally be divided into ferritic stainless steel, austenitic stainless steel, martensitic stainless steel, duplex stainless steel and precipitation hardening stainless steel.
In petroleum and petrochemical applications, austenitic stainless steel, ferritic stainless steel and duplex stainless steel account for a large proportion. Petroleum pipelines are the bulk of consumption of stainless steel pipes. Stainless steel plays an important role in equipment manufacturing, oil extraction, oil refining and transportation in the petroleum industry.
In the petroleum and petrochemical industry, stainless steel is mainly used in pipeline transportation systems, including high-pressure furnace pipes, piping, petroleum cracking pipes, fluid transmission pipes, heat exchange pipes, etc. which is required to perform well under wet and acid service.
