Low carbon steel sheet and low carbon steel slab and process...

Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal

Reexamination Certificate

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C148S540000, C148S541000, C164S468000, C164S499000

Reexamination Certificate

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08048197

ABSTRACT:
The present invention provides a low carbon steel sheet and a low carbon steel slab on which formation of surface defects can be surely prevented by preventing aggregation of inclusions in the molten steel and finely dispersing inclusions in the steel sheet or slab, and a process for producing the steel sheet and slab. The present invention provides a process comprising the steps of decarburizing a molten steel so as to produce a carbon concentration of up to 0.01% by mass, pre-deoxidizing the molten steel by adding Al thereto so as to produce a dissolved oxygen concentration from 0.01 to 0.04% by mass, adding thereto Ti and at least La and/or Ce, and casting the molten steel, and a steel sheet and a steel slab obtained by the process.

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The Iron and Steel Institute of Japan, “Waga Kuni ni okeru Hagane no Renzoku Chuzo Gijutsushi”, Nov. 30, 1996, pp. 286-287.
Acta Metallurgica Sinica, Jun. 1978, vol. 14, No. 2, pp. 196-197.

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