A high-strength and ductility, low specific gravity and its manufacturing method, a steel

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PROBLEM TO BE SOLVED : To provide a high-strength low-specific gravity steel sheet having excellent ductility, and to provide its production method. ŽSOLUTION : The high-strength low-specific gravity steel sheet having excellent ductility and workability has a composition comprising, by mass, >0.1 to 0.5% C, 0.2 to 3.0% Si, >0.2 to 3.0% Mn, 3.0 to 10.0% Al, 0.003 to 0.01% N and >0.1 to 1.0% Ti, and in which the content of P is limited to ≤0.02% and S to ≤0.01%, satisfying 0.2COPYRIGHT : (C)2009, JPO&INPIT Ž