Process for the production of semi-finished articles of hard ste

Details Process for the production of semi-finished articles of hard ste Process for the production of semi-finished articles of hard ste

1981-08-06

1986-10-14

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

148 12R, 148 3, 164486, 164263, 164476, 164477, C21D 800

Patent

active

046170677

ABSTRACT:
The present invention is directed to a continuous casting process for the production of semi-finished articles or blanks of hard steels such as bars, wires or tubes having a carbon content higher than 0.75%. In this process, the blank obtained by continuous casting is submitted to a secondary cooling under the mold, cut and within three minutes after cutting, introduced into a reheating furnace in which its temperature is brought to a level slightly lower than the solidus temperature, maintained for a short period, and finally elongated in the hot condition. In a preferred embodiment, the liquid steel is stirred during the continuous casting operation by means of magnetic fields induced in the steel by electromagnetic coils disposed around the blank thereby facilitating dissolution of carbides contained within the liquid steel.

REFERENCES:
patent: 3430684 (1969-03-01), Babel et al.
patent: 3961994 (1976-06-01), Thome
patent: 4077812 (1978-03-01), Tani
patent: 4221612 (1980-09-01), Thome
Gueussier et al, "Rotary Continuous Casting Enhances Control of Crystallization in Producing Tube Rounds, Industrial Heating, Sep. 1982.
Hanley, "Electromagnetic Linear Stirring for Quality Control in Continuous Casting", Industrial Heating, Sep. 1982.

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