Method of producing ultra-low-carbon steel

Details Method of producing ultra-low-carbon steel Method of producing ultra-low-carbon steel

1991-09-30

1992-10-06

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

75511, C21C 710

Patent

active

051528312

ABSTRACT:
A method of producing an ultra-low-carbon steel by using a vacuum degasser on a molten steel has the steps of conducting vacuum decarburization to attain a predetermined level of carbon content, e.g., 25 ppm or below, in the molten steel while progressively reducing the pressure in said vacuum degasser, conducting addition of hydrogen in which hydrogen is dissolved in said molten steel while said pressure is temporarily elevated to 20 Torr or above, and conducting final decarburization after reducing said pressure to 2 Torr or below. The addition of hydrogen may be conducted to meet the following conditions:

REFERENCES:
patent: 3337329 (1967-08-01), Finkl
patent: 4071356 (1978-01-01), Yamamoto
patent: 5011531 (1991-04-01), Takahashi

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