Abstract
Polar steel requires good strength and excellent toughness for breaking icy surfaces in low-temperature sea water environments. In this study, the effect of inclusions and metallurgical structure on the mechanical property of polar steel was examined. The composition and morphology of the inclusions in steel were formed using different deoxidation methods during steel refining, and steel plates were rolled by the same rolling process. The results show that there are lower inclusion densities and more globular inclusions in steel deoxidized using Zr–Ti than deoxidized using Al. The mean diameters of grains in Zr–Ti-killed steel from different thicknesses are smaller than that in Al-killed steel, the impact toughness and yield strength of Zr–Ti-killed steel are substantially higher than those of Al-killed steel. It is determined that the use of the Zr–Ti deoxidizer has a positive effect on the ductility of the steel.
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