effect of phosphorus on properties of steel

in this article, the experiments carried out on making, rolling and measuring the physical and mechanical properties of iow - carbon ferritic steels of various phosphorus contents ranging from 0.0 11 to 0.085 percent are discussed • the results indicate that possibility of performance of both cold and hot rolling operations up to at least one fourth of the initial thickness exists through a sequential heating technique. the formation of marginal cracks in the specimens with higher phosphorus contents, however , causes wasting of the metal and lessening of the percentage of the thickness - reduction in each stage of the rolling operation • hot rolling creates less cracks than cold rolling because of the hiqher formability, the lower yeild stress and the closure of the shrinkage holes at the hot rolling temperatures • an increase in the phosphorus content also causes grain refinement, growth of the yeild stress; enhancement of the ultimate tensile strength, raise of the intergranular and transgranular hardness and a limited change in the elongation of the samples.