Metal treatment – Stock – Ferrous
Reexamination Certificate
2008-03-25
2008-03-25
Wyszomierski, George (Department: 1742)
Metal treatment
Stock
Ferrous
C420S083000
Reexamination Certificate
active
10481800
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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Acta Metallurgica Sinica, Jun 1978, vol. 14, No. 2, pp. 196-197.
Kimura Yoshiaki
Matsumiya Tooru
Nakashima Junji
O-hashi Wataru
Sasai Katsuhiro
Kenyon & Kenyon LLP
Nippon Steel Corporation
Wyszomierski George
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