HIGH TENSILE STRENGTH THIN STEEL SHEET FOR PRESS WORKING AND ITS MANUFACTURE

摘要: PURPOSE:To obtain a high tensile strength thin steel sheet good in ductility, deep drawability and secondary working brittleness resistance by subjecting contg. specified C, Si, Mn, P, N, Al, S Fe to heat treatment, rolling or the like under prescribed conditions. CONSTITUTION:A constituted of, weight, 0.0005 0.005% 0.5 2.5% 3% -1 +2% (Mn-Si), 0.04 0,15% >=5Mn/P, 0.01% =48X(N/14+C/12) Ti balance is melted. This hot-rolled at <=Ar3 transformation point coiled an ordinary temp. 700 deg.C. Next, descaled, thereafter cold-rolled 50 90% draft furthermore subjected recrystallization annealing.