Influence of Al content on the corrosion resistance of micro-alloyed hot rolled steel as a function of grain size

Abstract

High-strength low-alloy steel (HSLA) has been widely used in many applications involving automobiles, aerospace, construction, and oil and gas pipelines due to their enhanced mechanical and chemical properties. One of the most critical elements used to improve these properties is Aluminium. This work will explore the effect of Al content on the corrosion behaviour of hot rolled high-strength low-alloy steel as a function of grain size. The method of investigation employed was weight loss technique. It was obvious that the increase in Al content enhanced corrosion resistance through refinement of grain size obtained through AlN precipitation by pinning grain boundaries and hindering their growth during solidification which was found to be beneficial in reducing corrosion rate.

Effect of Heat Treatment Conditions on Corrosion Resistance of 0.28C–1.4Mn–0.3Si–0.26Cr Steel with Nb, Ti, and V Microadditions

“…Ferritic steels are characterized by a very good corrosion resistance due to the uniform distribution of ferrite. While cathode and anode regions are close to each other, there is no possibility of forming galvanic cells [36][37][38]. Steels with a strength higher than ferritic steels, with martensitic or bainitic microstructure, have lower corrosion resistance due to the presence of high density lattice defects that favor corrosion.…”

Investigation of corrosion resistance of high-strength low-alloy (HSLA) steel in fresh and salt water for pipeline application

“…In the current work, the cooling rate was kept low enough, ~30 o C min -1 , to prevent the formation of lower transformation products. Refinement of grain size has been found to be beneficial in promoting corrosion resistance of HSLA steel [2]. Optimising the thermal treatment and the addition of grain refining alloys can contribute considerably in refining grain size and hence improving corrosion behaviour of HSLA steel.…”

“…However, corrosion was not the primary consideration during the development of HSLA steel and hence more work is essential to understand the reactivity of the steel in a given environment. Corrosion is a natural process that causes damage and degradation of metal properties due to some chemical reactions with external environments [2].…”