Patent ID: 8012276

Claim:
A method for manufacturing a steel sheet for a tinplate or a TFS steel sheet each having excellent formability and a target hardness level (HR30T) in the range of 61±3 to 76±3, comprising the steps of: hot rolling a steel containing in terms of percent by mass: C: 0.0030 to 0.0060%, Si: 0.04% or below, Mn: 0.60% or below, P: 0.005 to 0.03%, S: 0.02% or below, Al: more than 0.005% to 0.1%, N: 0.005% or below, satisfying the following formula <1>, and the balance of Fe and unavoidable impurities, at a finish rolling temperature of an Ar 3 temperature or above and a coiling temperature within the range of greater than 650° C. and not exceeding 750° C.; cold rolling at a reduction ratio of 85 to 95%; then annealing at a recrystallization temperature or above; and temper rolling or double reduce rolling to selectively manufacture a steel sheet having said target hardness level (HR30T) in the range of 61±3 to 76±3, and a sheet thickness of 0.2 mm or below, with a reduction ratio selected according to said target hardness level: 1.6× C× 10 4 +0.93× P× 10 3 ≧70 <1>.