Coordinated control of carbon and oxygen for ultra-low-carbon interstitial-free steel in a smelting process

作     者：Min Wang Yan-ping Bao Quan Yang Li-hua Zhao Lu Lin 

作者机构：State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing National Engineering Research Center of Flat Rolling Equipment University of Science and Technology Beijing 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2015年第22卷第12期

页      面：1252-1259页

核心收录：

学科分类：080602[工学-钢铁冶金] 080802[工学-电力系统及其自动化] 0808[工学-电气工程] 08[工学] 0806[工学-冶金工程] 

基　　金：financially supported by the State Key Laboratory of Advanced Metallurgy Foundation in China (No. KF13-09) the National Natural Science Foundation of China (No. 51404018) the Fundamental Research Funds for the Central Universities (No. FRF-TP-14-125A2) the Doctoral Fund of the Ministry of Education of China (No. 20130006110023) 

主　　题：low carbon steel smelting decarburization cleanness 

摘      要：Low residual-free-oxygen before fmal de-oxidation was beneficial to improving the cleanness of ultra-low-carbon steel. For ultra-low-carbon steel production, the coordinated control of carbon and oxygen is a precondition for achieving low residual oxygen during the Ruhrstahl Heraeus （RH） decarburization process. In this work, we studied the coordinated control of carbon and oxygen for ultra-low-carbon steel during the basic oxygen furnace （BOF） endpoint and RH process using data statistics, multiple linear regressions, and thermodynamics computations. The results showed that the aluminum yield decreased linearly with increasing residual oxygen in liquid steel. When the mass ratio of free oxygen and carbon （[O]/[C]） in liquid steel before RH decarburization was maintained between 1.5 and 2.0 and the carbon range was from 0.030wt% to 0.040wt%, the residual oxygen after RH natural decarburization was low and easily controlled. To satisfy the requirement for RH decarburization, the carbon and free oxygen at the BOF endpoint should be controlled to be between 297 × 10^6 and 400 × 10^-6 and between 574 × 10^-6 and 775 × 10^-6, respectively, with a temperature of 1695 to 1715℃ and a furnace campaign of 1000 to 5000 heats.