FERRITIC STEEL

The present invention discloses a ferritic steel having decreased specific gravity and having excellent mechanical strength by suppressing formation of [kappa]-carbide. The ferrite steel may include:carbon (C) in an amount of about 0.05 to 0.12 wt %; aluminum (Al) in an amount of about 3.0 to 7.0 wt %; manganese (Mn) in an amount of about 0.5 wt % or less (not 0%); nickel (Ni) in an amount of about 0.5 wt % or less (not 0%); chromium (Cr) in an amount of about 0.75 wt % or less (not 0%); silicon (Si) in an amount of about 0.3 to 0.75 wt %; a combined amount of titanium (Ti) and vanadium (V) in an amount of about 0.25 to 0.7 wt %; and a balance being iron (Fe), all the wt % are based on the total weight of the ferritic steel. 本文公开了一种通过抑制κ-碳化物的形成而具有降低的比重和具有优异的机械强度的铁素体钢。铁素体钢可以包括：约0.05wt％至0.12wt％的量的碳；约3.0wt％至7.0wt％的量的铝；约0.5wt％或更少但大于0wt％的量的锰；约0.5wt％或更少但大于0wt％的量的镍；约0.75wt％或更少但大于0wt％的量的铬；约0.3wt％至0.75wt％的量的硅；约0.25wt％至0.7wt％的量的钛和钒的组合量；和余量的铁，所有wt％均基于铁素体钢的总重量。