The effects of alloying elements on mechanical properties of NIOMOL 490K steel

Abstract

This paper is to study the effect of alloying elements on mechanical properties of highstrength low-alloy steel, NIOMOL 490K. This steel grade belongs to the class of molybdenum microalloyed steels, in which microalloying with molybdenum serves to increases the heat resistance of steel along with the effect of increasing the influences of other alloying elements. This steel grade is designed for welded pressure vessels fabrication and is primarily applied for dynamic loading conditions at low operating temperatures. Highstrength low-alloy steels used nowadays are usually obtained by means of suitable chemical composition and thermo-mechanical treatment. In present paper, the tensile and hardness tests were used to determine the effect of mechanical properties of NIOMOL 490K steel.