Dual phase steel and method of forming the same

Abstract

A dual phase steel and a method of forming the same are provided. The method includes the following steps: a steel billet is provided; a hot-rolling operation is performed to the steel billet to obtain a hot-rolled steel; a cold-rolling operation is performed to the hot-rolled steel to obtain a cold-rolled steel; and a continuous annealing operation is performed to the cold-rolled steel. The continuous annealing operation includes the following steps: an isothermal annealing step is performed to the cold-rolled steel to obtain an annealed steel; and an air cooling step is performed to the annealed steel to obtain the dual phase steel. Therefore, the dual phase steel can have great tensile strength, great elongation and great work hardening index.

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