Abstract
An investigation into the corrosion resistance of steels with various contents of carbon and microalloying elements was carried out. It was shown that the presence of a large amount of nanosized (2–3 nm and less) precipitates of the interphase type, particularly niobium carbonitride and vanadium carbonitride, leads to a decrease in the corrosion resistance of hot-rolled sheet products. It was found that, after heat treatment of rolled products at 710 °C, the corrosion resistance of the metal is improved. One of the reasons for this is a decrease in the amount of interphase precipitates, which negatively affect the corrosion resistance of steel, while particles formed in austenite and ferrite do not have such an effect. To ensure high corrosion resistance of steels for oil-field pipelines, microalloying with niobium instead of vanadium is advisable, as well as heat treatment at temperatures above 710 °C.
Highlights
The results presented below make it possible to assess the dependence of corrosion resistance of steels on, namely, the characteristics of precipitates of excess phases formed with the participation of microalloying elements: carbides or carbonitrides
For theseThe steels, as in the casechemical of steelscomposition with a lowerand content of microalloying influence of the precipitations of carbonitride excess elements, the main structural differenceresistance between heat-treated hot-rolled steelsenvironments, phases on the corrosion of low-alloy steels steelsand in neutral aqueous is a large fraction of nanosized mixed,conditions ferritic and precipitates
A decrease in typical for the operating of austenitic oil-field pipelines, has been investigated. It is shown a decrease in the corrosion resistance products is caused by the the fraction of that interphase precipitates, in this case, leads of to hot-rolled an increasesheet in the corrosion presence a large effect amount nanosized precipitates resistance of steel
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The possibilities of increasing the corrosion resistance of carbon and low-alloy steels, operating in neutral aqueous environments, are attracting great attention. The solution to this problem is especially relevant for oil-field pipelines. In addition to crude oil, they transport highly mineralized formation water that intensifies corrosion processes [1,2]
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