Abstract
The results of study of influence of the chemical composition of steel, the structural condition and contamination of nonmetallic inclusions of various types on its corrosion resistance in seawater are presented in the paper. The requirements for increased-corrosion-resistance steel for marine conditions and oilfield pipelines have been compared. It has been shown that a mandatory requirement for ensuring high corrosion resistance of steels is to ensure the purity of steels from unfavorable types of nonmetallic inclusions. It has also been shown that reducing the carbon content and alloying with nickel lead to an increase in the corrosion resistance of steel.
Highlights
IntroductionImproving the resistance of steel metal products against general and local corrosion in neutral aqueous media with a pH value of pH 6–8 is important for numerous structures operating in atmospheric conditions, in seawater, for heat pipelines, infield pipelines, water supply systems, and many other types of structures and equipment
Improving the resistance of steel metal products against general and local corrosion in neutral aqueous media with a pH value of pH 6–8 is important for numerous structures operating in atmospheric conditions, in seawater, for heat pipelines, infield pipelines, water supply systems, and many other types of structures and equipment.Systematic studies on improving the reliability service of steels for oilfield pipelines have shown the possibility of significantly increasing their corrosion resistance by optimizing the chemical composition, structural condition, and increasing the purity of steel from certain types of nonmetallic inclusions [1]The influence of nonmetallic inclusions (NMI) on the corrosion resistance of steels for oilfield pipelines has been dealt with in many papers [1,2,3]
It has been established that part of the requirements for steels with increased corrosion resistance for oilfield pipelines and that for marine conditions are the same, but there are significant differences as well
Summary
Improving the resistance of steel metal products against general and local corrosion in neutral aqueous media with a pH value of pH 6–8 is important for numerous structures operating in atmospheric conditions, in seawater, for heat pipelines, infield pipelines, water supply systems, and many other types of structures and equipment. Systematic studies on improving the reliability service of steels for oilfield pipelines have shown the possibility of significantly (by 2–5 times) increasing their corrosion resistance by optimizing the chemical composition, structural condition, and increasing the purity of steel from certain types of nonmetallic inclusions [1]. The influence of nonmetallic inclusions (NMI) on the corrosion resistance of steels for oilfield pipelines has been dealt with in many papers [1,2,3]. The influence of chemical composition and structural characteristics on the corrosion resistance of steels for oilfield pipelines was considered in [4]. The purpose of this work was to determine the nature of influence of the chemical composition of steel, structural condition, and contamination with nonmetallic inclusions of various types on its corrosion resistance in seawater and to compare the requirements for increasedcorrosion-resistance steel for marine conditions and oilfield pipelines
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