The problems of low qualification ratio of steel plate properties exist in production of SS 400 steel plate at AISC Wide and Heavy plate Plant. The influence of chemicalcomposition in steel on the yield strength, tensile strength and elongation of steel is approached in view of SS400 steel plate produced previously,it is concluded that the main factors influencing them are carbon content and steel plate thickness. The lineal regression analysis of chemical composition and mechanical properties of steel plat...