Abstract
Modern high-strength steels achieve their strength exclusively through the manufacturing process, as the chemical composition of these steels is very similar to the composition of standard-quality steels. Typically, hot-dip galvanizing is used to form a protective zinc layer on the steel parts of structures; nonetheless, the material is exposed to high temperatures during the process. With high-strength steels, this can lead to deterioration of the mechanical properties. This study aims to experimentally examine and evaluate the extent of deterioration of the mechanical properties of high-strength-steel members. The effect was studied on specimens made of three different types of steel with the yield strength ranging from 460 to 1250 MPa. For each type of steel, selected mechanical properties—yield strength, tensile strength, and hardness—were determined on specimens with and without hot-dip galvanization, and the obtained results were mutually compared. Our study shows a significant impact of the hot-dip galvanization process on the mechanical properties of some high-strength steels. With the studied types of steel, the yield strength decreased by up to 18%, the tensile strength by up to 13%, and the hardness by up to 55%.
Highlights
Steels are commonly classified as high-strength steels if their yield strength exceeds460 MPa
The fracturing mode was different in these steels: Ductile fractures appeared in the case of DOMEXbrand steels; the steels with a higher yield strength showed, on the other hand, cleavage fracture
Experimental research has confirmed that hot-dip galvanizing causes a significant deterioration of the mechanical properties of selected types of high-strength steels
Summary
Steels are commonly classified as high-strength steels if their yield strength exceeds460 MPa. High-strength steels can be used for either entire load-bearing structures, or key (high-stressed) structural components only With this advantage, they are used in structures such as silos, tanks, hoppers, towers, and masts; for load-bearing structures in manufacturing facilities; and for loadbearing elements in bridges and footbridges [1]. They are used in structures such as silos, tanks, hoppers, towers, and masts; for load-bearing structures in manufacturing facilities; and for loadbearing elements in bridges and footbridges [1] These applications are implied by their high strength, which allows the transmission of high-intensity loads while using more economically sized elements [2]. Atmospheric corrosion of structures and structural members made from steel represents an important technical and economic problem, which concerns standard-quality steels (i.e., steels with a yield strength of up to 460 MPa, mainly steels S235 and S355) as well as high-strength steels.
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