Steelmaking degassing method

Details Steelmaking degassing method Steelmaking degassing method

1994-09-02

1996-05-28

Kastler, Scott

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

266210, C21C 710

Patent

active

055207189

ABSTRACT:
A method for degassing molten steel comprises the use of a lift gas which includes carbon dioxide. The inventive method includes providing a reaction zone isolated from the ambient atmosphere, and providing a bath of molten steel, at least a portion of which is located in the reaction zone. The pressure is reduced in the reaction zone to a sub-atmospheric pressure. A gas comprising carbon dioxide is supplied to the bath of molten steel in order to vertically circulate the molten steel. The method also preferably includes (a) supplying carbon dioxide, e.g., with a tuyere, to the reaction zone and (b) supplying carbon dioxide to the bath of molten steel, e.g., by gas bubbling or stirring. An apparatus for performing the method steps is also disclosed.

REFERENCES:
patent: 3581803 (1971-06-01), Finkl
patent: 3649246 (1972-03-01), Fulton et al.
patent: 3955964 (1976-05-01), MacDonald et al.
patent: 4104057 (1978-08-01), Maas et al.
patent: 4378242 (1983-03-01), Harris et al.
patent: 4541862 (1985-09-01), Finkl et al.
patent: 4545815 (1985-10-01), Toth et al.
patent: 4604137 (1986-08-01), Yamada
patent: 4810286 (1989-03-01), Schlichting et al.
patent: 4979983 (1990-12-01), Nishikawa et al.
patent: 4994108 (1991-02-01), Hammagami et al.
patent: 5242484 (1993-09-01), Schonewolf et al.
"Production of Steel Castings," Metals Handbook, Edited by Taylor Lyman, American Society For Metals, 8th Edition, vol. 5, Forging and Casting Dec. 1970, pp. 380-383.
"Vacuum Degassing of Steel For Ingots," The Making, Shaping and Treating of Steel, Edited by Harold E. McGannon, United States Steel, Ninth Edition Dec. 1971, pp. 591-598.
Okamoto, S. et al., "The Behavior of Hydrogen in Molten Steel During Steelmaking Processes," Proceedings of the Seventh International Conference on Vacuum Metallurgy (Special Melting and Metallurgical Coatings), Keidanren Kaikan, Tokyo, Japan, Nov. 26-30, 1982, pp. 1436-1443.
Paules et al., "Ladle Stirring & Stream Shrouding With Carbon Dioxide at Armco's Midwestern Steel Division," 70th Steelmaking Conference Proceedings, vol. 70, Pittsburgh Meeting, Mar. 29-Apr. 1, 1987, pp. 129-132.
Abratis, H. et al., "Vacuum Ladle Treatment at the KMS Plant in Georgsmarienhutte," International Conference Secondary Metallurgy (Preprints), Sep. 21-23, 1987, pp. 278-290.
Kittenbrink, Douglas A. et al., "The Start-Up of the First RH-OB Vacuum Degasser in North America," 71st Steelmaking Conference Proceedings, vol. 71, Toronto Meeting, Apr. 17-20, 1988, pp. 1-12.
Schlichting, Mark et al., "Design and Start-Up of Inland's New Vacuum Degassing Facility," Iron and Steel Engineer, vol. 66, No. 3, Mar. 1989, pp. 47-52.
Balajee, S. R. et al., "Conversion of Inland Steel's No. 4 BOF Shop To Combined Blowing With LD-CB," 1990 Steelmaking Conference Proceedings, vol. 73, Mar. 25-28, 1990, pp. 319-329.
Szatkowski, Marian T. et al., "Recent Advances in Vacuum Metallurgy Process Control," Iron and Steel Engineer, Jul. 1990, pp. 25-32.
"Developments In Gas Application Technology," TechTopics, Airco Industrial Gases Sep. 1992.
Nagasaka, Tetsuya et al., "Reaction Kinetics of CO.sub.2 -H.sub.2 O Gas Mixtures with Liquid Fe-C Alloys," ISIJ International, vol. 34 (Mar. 1994), No. 3, pp. 241-246.

Affiliated with

Also associated with

Rating

Steelmaking degassing method does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Steelmaking degassing method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Steelmaking degassing method will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-783335