1. Research Institute of Technology Shougang Group Co., Ltd. Beijing 100043 P. R. China
2. Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology Beijing 100043 P. R. China
3. Beijing Engineering Research Center of Energy Steel Beijing 100043 P. R. China
4. Steelmaking Department Shougang Jingtang United Iron & Steel Co., Ltd. Tangshan Hebei 063200 P. R. China