The main production equipment of annealing process consists of 4 sets of STC annealing furnace, which is designed and manufactured by SAC company of Korea, and the continuous annealing furnace is composed of 2 units. All of the annealing furnace adopts RX as the protective gas, which can realize the automatic control of the whole annealing process, the carbon potential can be automatically balanced, and the annealing process can not be ensured, and the pearlite spheroidization rate can reach more than 90%. Annual output of 80 thousand tons.