Steel plate for automobile and production method thereof

The invention discloses a steel plate for the automobiles. The steel plate comprises the following chemical compositions in percent by mass: 0.0015%<=C<=0.004%, 0.35%<=Mn<=0.65%, Si<=0.03%, 0.03%<=P<=0.05%, S<=0.015%, 0.02-0.07% of Als, 0.005%<=Nb<=0.015%, 0.0002%<=B<=0.0015%, N<=0.004% and the balance of Fe and trace elements. The invention also discloses a method for producing the steel plate for the automobiles. The steel plate produced by the method provided by the invention is characterized by stable bake hardenability BH2 and good aging resistance, and achieves the aims of energy saving and emission reduction. Through the invention, the product quality is improved, and considerable economic benefits are brought.