Batch annealing interstitial-free (IF) steel and production method thereof

The invention discloses batch annealing interstitial-free (IF) steel. The steel comprises, by mass, 0.0005-0.0035 of carbon, no more than 0.03 of silicon, 0.05-0.30 of manganese, no more than 0.008 of phosphorus, no more than 0.012 of sulphur, no more than 0.004 of nitrogen, 0.02-0.07 of aluminum, 0.04-0.09 of titanium, 0.003-0.015 of niobium, 0.0003-0.0020 of barium and the balance ferrum and trace elements. The invention also discloses a production method of the IF steel. By the aid of the steel and the method, the component design is proper, a process optimization method in which the batch is retreated and the stress and the recrystallization are performed is used, the crystal boundary distribution condition of the IF steel is improved, the ductile-brittle transition temperature (DBTT) of the IF steel is lowered to below -60 DEG C, the secondary-processing brittle resistant performance of the IF steel is improved, and automatic industry requirements are met well.