Abstract
Studies show that although commonly used steels are standardized, some of their mechanical properties (such as tensile strength) vary widely and knowledge of their corrosion behavior is insufficient. Additional treatments, such as plastic deformation, alter the structure of carbon steels and affect their properties. This article explores one of the most widely used materials in mechanical and civil engineering - steel S235. Two types of rods, 6 mm in diameter, from hot-rolled non-alloy structural steel (S235JR, BDS EN 10025-2: 2005) and bright cold drawn steel (S235JRC, BDS EN 10277-2: 2008) have been tested. Tensile tests have been carried out, stress-strain curves are constructed and compared, the main mechanical properties such as yield strength, tensile strength and modulus of elasticity are determined. The typical consequences of plastic deformation such as increased yield strength have been identified. The assessment of corrosion behavior was done by means of the weight loss method in a 3,5% NaCl water solution for 5 weeks. It was found out that in the studied period the two types of rod exhibit close corrosion resistance, with the tendency for the cold drawn steel to have a higher uniform corrosion rate over a longer period.
Highlights
Low-cost carbon steels are used as the preferred construction material across industries and are considered to be a more economical option than the costly corrosionresistant alloys [1]
Depending on the carbon content they are divided into 3 groups – low carbon steels (
The results presented here belong to the initial stage of a comprehensive study of the impact of corrosion on the mechanical properties of steel S235JR and S0235JRC rods
Summary
Low-cost carbon steels are used as the preferred construction material across industries and are considered to be a more economical option than the costly corrosionresistant alloys [1]. Carbon steels are used in a wide range of applications, such as structural components, industrial pipes, pipelines that supply gas and oil, construction and others They are susceptible to corrosion under the conditions of industrial operations. That is why it is of great importance to study the impact of corrosion on the mechanical properties in order to be able to make a correct assessment of the corroded steel structures. This allows for the building of models for adequate forecasting and evaluation of the behavior and safety of these constructions. The results presented here belong to the initial stage of a comprehensive study of the impact of corrosion on the mechanical properties of steel S235JR and S0235JRC rods
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