1. a evener each meter calcium quantity and is higher, the stabler active calcium content to guarantee that the calcium processing effect is stabler; 2. the thicker outside shell (millimeter) and the high density pure calcium core rod may feed the calcium to the molten steel in a deeper spot, and pauses a longer time below the critical depth, thus achieves the higher calcium returns-ratio; 3.the pure calcium, the calcium treating processes will not lead the powder package of core existence other oxide compounds to pollute the molten steel (for example: In calcium iron wire&＃039;s ferric oxide as well as calcium aluminum wire aluminum oxide and so on);