Method Of Manufacturing Cold Rolled Low Carbon Microalloyed Steel Having High Strength, Ductility, And Formability

Abstract: The present disclosure provides a method (100) of manufacturing the a cold rolled low carbon micro-alloyed steel having high strength, ductility, and formability combination comprising the following composition expressed in weight %: (C): 0.04% - 0.08%, (Mn): 1.2% - 1.5%, (S): 0.003% - 0.004%, (P): 0.014% or less, (N): 70 ppm or less, (Si): 0.25% - 0.5%, (Al): 0.02% - 0.04%, (Cr): 0.5 - 0.75%, (Mo): 0.002% or less, (Cu): 0.009% or less, (V): 0.001% or less, (Ti): 0.01% or less, (Nb): 0.02% or less, (Ca): 0.003% or less, (B): 0.003% - 0.005%, (Ni): 0.02% or less and the balance being Iron (Fe) and unavoidable impurities. The steel comprising any one of a ferrite-bainite dual phase morphology or a fine grain ferrite-martensite dual phase morphology exhibits a unique combination of high 𝑟̅ (Normal Anisotropy), high strength and ductility.

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