Acta Metallurgica Sinica (English Letters) ›› 1994, Vol. 7 ›› Issue (2): 114-118.
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WANG Chengguo. PENG Qifeng. LIU Junhai, SUN XitaiShandong Polytechnic University. Jinan, ChinaZHU Jing. CAI QigongCentral Iron and Steel Research Institute. Ministry of Metallurgical Industry. Beijing, China Manuscript received 14 April, 1994