NON-AGING TYPE COLD ROLLED STEEL SHEET WITH HIGH YIELD RATIO AND PROCESS FOR PRODUCING THE SAME

A non-aging type cold rolled steel sheet capable of enhancing yield strength and lowering in-plane anisotropy by fine MnS precipitates and AlN precipitates and a method for manufacturing the same are provided. A non-aging type cold rolled steel sheet with high yield ratio comprises, by weight percent, 0.005% or less of C, 0.01 to 0.3% of Mn, 0.005 to 0.08% of S, 0.1% or less of Al, 0.004 to 0.02% of N, 0.2% or less of P, 0.0001 to 0.002% of B and 0.005 to 0.15% of Ti with the balance being Fe and other inevitable impurities, wherein the Mn, S, Ti, N and C satisfy relational expressions of 1