Effect of Deoxidation Practice on the Mechanical Properties of Low Alloy Plain Carbon Steel

Abstract

The current research work insights the form and distribution of the sulphide inclusions in the steels. The deoxidation practice to the steels alter, the form and the distribution of the sulphide inclusions. In this present study, the effect of deoxidation practice on properties of low alloy and plain carbon steels done using, Aluminum (0.5–2.0 kg/T) and calcium silicide (0.5–2.5 kg/T) as deoxidants, and the comparative study of arc furnace and induction furnace is done. Ca–Si was added along with Al at the bottom of the ladle for the melt of arc furnace, whereas Al and Ca–Si were added separately to the ladle, for the induction furnace melt. The mechanism for the formation and the morphology of non-metallic inclusions were analyzed by determining the oxygen content and microstructure. From the microstructural analysis it has found that aluminium of size 40 μm in diameter produced elongated inclusions which may act as stress concentrators for originating cracks, where calcium–silicide form oxysulphides of spheroidal shape when added with 1.5 kg calcium silicide per ton of steel, which resulted in the rise in the ductility and impact properties.