SAE8620H steel was introduced from the American AISI standard. It was mainly applied on the gear of heavy automobile, digger, crane and other machinery. 8622H gear steel is produced by the EAF-LF(VD) refining-320 mm×480 mm continuous casting-hot rolling process at Nanjing Iron and Steel United Co., Ltd. The rational inner controlling has been formulated, as well as the key processes of the EAF endpoint control, deoxidization for producing the white slag in LF and casting with all protection at the low overheating temperature etc. have been strengthened. The 8622H steel presented by the paper has high cleanness, uniform microstructure and narrow bandwidth of quenching degree.