A PROCESS FOR MANUFACTURING A HOT-ROLLED HIGH STRENGTH STEEL BY TSCR ROUTE

摘要

A process for manufacturing a hot-rolled high strength steel by TSCR method comprises steps of casting a steel of composition Carbon (C): 0.04-0.06, Manganese (Mn): 1.00-2.00, Sulphur (S): 0.002-0.010, Phosphorus (P): 0.005-0.050, Silicon (Si): 0.05-0.60, Aluminum (Al): 0.02-0.10, Nitrogen (N): 0.004-0.007, Tin (Ti): 0.06-0.12, Niobium (Nb): 0.005-0.100, Molybdenum (Mo): 0.15- 0.25, Iron (Fe) & unavoidable impurities:rest(all in wt. percentage),heating the steel in a tunnel furnace at a temperature 1130-1200ºC, rolling the steel at finished rolling temperature (FRT) OF 850-950 ºC,Cooling the steel at run out table (ROT) at a rate of 30-100 ºC and coiling the steel at coiling temperature of 600-700 ºC.