Method of making ultra-low carbon and sulfur steel

Details Method of making ultra-low carbon and sulfur steel Method of making ultra-low carbon and sulfur steel

1994-01-26

1995-12-05

Andrews, Melvyn

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

C21C 710

Patent

active

054724791

ABSTRACT:
A method of making ultra-low carbon, ultra-low sulfur content steel comprising introducing molten metal and slag into a vacuum decarburizer to reduce the carbon content of the metal to below 0.005%, followed by deoxidizing the molten steel, deoxidizing the slag and mixing the slag with the molten steel to reduce the sulfur content to below 0.005%.

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patent: 3867211 (1975-02-01), Easton
patent: 3925061 (1975-12-01), Carlsson et al.
patent: 4564390 (1986-01-01), Gupta et al.
patent: 5304231 (1994-04-01), Kato et al.
Hatakeyana et al., Develpment of a New Secondary Refining Process Using an RH Vacuum Degasser, Jul. 1989 I & SM pp. 23-29.
Performance Specification Level II Software LFT/VTD, Messo Metallurgie, 25, Feb. 1991, p. 2.
Endoh et al., Development of Multifunctional Secondary Refining Process (RH-Injection Process), Nippon Steel Technical Report, No. 45 Apr. 1990, pp. 23-28.

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