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Ironmaking & Steelmaking
Processes, Products and Applications
Volume 45, 2018 - Issue 5
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Research Article

Inclusion modification in Al-killed valve spring steel by Na2CO3 addition

Liangjun ChenState Key Laboratory of Advanced Metallurgy, University of Science and TechnologyBeijing, People’s Republic of China;Department of Materials Science & Engineering, University of Toronto, Toronto, ON, CanadaCorrespondence[email protected]
,
Weiqing ChenState Key Laboratory of Advanced Metallurgy, University of Science and TechnologyBeijing, People’s Republic of China
,
Wei YanState Key Laboratory of Advanced Metallurgy, University of Science and TechnologyBeijing, People’s Republic of China
,
Hongbing PengSchool of Metallurgical and Materials Engineering, Jiangsu University of Science and Technology, Zhangjiagang, People’s Republic of China
,
Yindong YangDepartment of Materials Science & Engineering, University of Toronto, Toronto, ON, Canada
&
Alexander McLeanDepartment of Materials Science & Engineering, University of Toronto, Toronto, ON, Canada
Pages 397-405 | Received 04 Apr 2018, Accepted 24 May 2018, Published online: 16 Jun 2018
 
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ABSTRACT

Hard inclusions with high melting temperatures such as Al2O3 (2054°C) and MgO·Al2O3 (2135°C) generate nozzle blockage problems during continuous casting of Al-killed valve spring steel and are very detrimental with respect to fatigue properties. In the present paper, inclusion modification in Al-killed valve spring steel by Na2CO3 addition was investigated in the laboratory using a graphite tube resistance furnace. The results show that inclusions with high melting temperature can be successfully modified into Na2O-containing inclusions with lower melting temperatures by the addition of Na2CO3. The effectiveness of inclusion modification can be enhanced by increasing the Na2CO3 addition and/or decreasing the amount of Al. This suggests that Na2CO3 addition could possibly be a substitute for Ca treatment as a method for preventing nozzle blockage during continuous casting of Al-killed steel.

Acknowledgements

The first author (L.J. Chen) would like to thank the China Scholarship Council (CSC) for support of his study abroad.

Disclosure statement

No potential conflict of interest was reported by the authors.

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