(1) Analyze the main factors, secondary factors that influence properties of deformed steel bar like yield strength, tensile strength and percentage elongation after fracture, and analyze the correlation between these factors.
(2) Model the influence rule between deformed steel bar properties and chemical elements like C, Mn, Cr, V, N,
(3) Research the reduction of alloy material like Mn and V in allowance range of deformed steel bar properties by Cr content increase, present the content modification scope of Mn, V, etc, and design composition optimization scheme.