A.1000±50 B.700±50 C.1200±50 D.900-1000
A.Fe≤±0.05%,S≤±0.01% B.S≤±0.01%,P≤±0.01% C.SiO2≤±0.4%,CaO≤±0.2% D.Fe≤±0.05%,SiO2≤±0.03%