Influence of plastic deformation of S235JR steel rods on their mechanical properties and corrosion behavior in NaCl solution

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.

S235JRC+C Steel Response Analysis Subjected to Uniaxial Stress Tests in the Area of High Temperatures and Material Fatigue

“…the values of the tested mechanical properties of steel S235JRC + C shown in this paper and those shown for the material S235JRC in [11], differ from each other.…”

“…The values of ultimate tensile strength, yield strength and modulus of elasticity of S235JRC shown in [11] are higher by 14%, 14.5% and 6%, respectively, compared to those related to the S235JRC + C steel tested in this study (this paper). Furthermore, the ultimate tensile strength values of S235JRC + C steel obtained at high temperatures in this study, can be compared with those relating to some other low-carbon (plain) steels such as AISI 1008 and AISI 1020, shown in [17].…”

“…• the chemical composition of the test material specified in this paper as well as chemical composition of the material specified in [11] is within the limits set by the EN standard.…”

“…In [10] the fatigue response of electrodeposited Ni-W on low carbon cold drawn steel (S235JRC) discs was studied, and it was considered as promising substitute for toxic hard chromium coatings. Further, in [11] the change of the ultimate tensile strength and the change of yield strength related to hot rolled S235JR steel and cold drawn S235JRC steel was investigated and analyzed. These test results were needed to compare the mechanical properties of two grades of steel, but also as a starting point for determining the change in mechanical properties during the development of corrosion.…”

“…Data comparison: Chemical composition and mechanical properties-standard, this research and Ref [11]…”