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

Min Wang; Yan-ping Bao; Quan Yang; Li-hua Zhao; Lu Lin

doi:10.1007/s12613-015-1192-x

Volume 22 Issue 12

Dec. 2015

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International Journal of Minerals, Metallurgy and Materials > 2015 > 22(12): 1252-1259. > DOI: 10.1007/s12613-015-1192-x

Min Wang, Yan-ping Bao, Quan Yang, Li-hua Zhao, and Lu Lin, Coordinated control of carbon and oxygen for ultra-low-carbon interstitial-free steel in a smelting process, Int. J. Miner. Metall. Mater., 22(2015), No. 12, pp.1252-1259. https://dx.doi.org/10.1007/s12613-015-1192-x

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

Min Wang^1,2), ,,
Yan-ping Bao¹⁾,
Quan Yang²⁾,
Li-hua Zhao¹⁾ and
Lu Lin¹⁾

Author Affilications

State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China
National Engineering Research Center of Flat Rolling Equipment, University of Science and Technology Beijing, Beijing, 100083, China

Funds:

This work was 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), and the Doctoral Fund of the Ministry of Education of China (No. 20130006110023).

Received: 21 December 2014; Revised: 11 March 2015; Accepted: 16 March 2015; Available Online: 10 June 2021

Graphical Abstract

Abstract

Abstract

Low residual-free-oxygen before final 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.
- low carbon steel,
- smelting,
- decarburization,
- cleanness

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