Process for continuous casting of a slightly deoxidized steel sl

Details Process for continuous casting of a slightly deoxidized steel sl Process for continuous casting of a slightly deoxidized steel sl

1979-11-06

1981-11-03

Baldwin, Robert D.

Metal founding

Process

Shaping liquid metal against a forming surface

164418, 164467, 164473, 164474, B22D 2702, B22D 1100

Patent

active

042980500

ABSTRACT:
In the continuous casting of steel, it has been possible to produce killed steel industrially, but semikilled and rimmed steel have not been successfully produced due to rimming action occurring in the oscillating mold. The present invention involves a concept of suppressing the nuclei of bubbles which will later grow into CO bubbles. In order to suppress the nuclei of bubbles and to form a non-defective solidification layer of a continuously cast strand, the present invention provides a combination of: a free oxygen concentration of from 50 to 200 ppm in the molten steel; a concave shape at the short sides of the mold; a propulsion forces of the molten steel directed along the long sides of the mold in directions opposite to one another; subjecting a solidification interface to an electromagnetic flow having a speed of from 0.1 to 1.0 m/sec, and; solidifying the molten steel at the solidification interface under the influence of the electromagnetic flow, until a non-defective solidification layer without blow holes is obtained.

REFERENCES:
patent: 3952791 (1976-04-01), Ito et al.
patent: 4042007 (1977-08-01), Zavaras et al.

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