OPTIMIZATION OF HIGH STRENGTH LOW ALLOY STEEL TO ACHIEVE REQUIRED OEM WEAR AND TENSILE PROPERTIES

The aim of this research was to study the effect of Nickel additions to high strength steel alloys and to obtain an optimal chemical composition that does not compromise the tensile strength and wear resistance properties provided by the OEM (Original equipment manufacturer) with cost saving to the manufacturing local foundry. The nickel content was added in composition from 0.5 wt% to 3.5 wt% to the molten metal. The test bar was then cut from the keel block and sectioned for laboratory analysis for determining tensile strength properties (ultimate tensile strength. yield strength and % elongation and wear resistance. The results obtained shows that there is significant increase in tensile strength and wear resistance and slight decrease in toughness with increase in nickel additions. The best optimal chemical composition was observed to be 2.0 % nickel alloy for optimal cost to fulfil the OEM mechanical and wear properties for the high strength steel used for mining grounding application, so this meant a 22.7 % cost saving when compared to the current chemical composition used in the foundry.