Sara R Anderson

US Patent:

48061565, Feb 21, 1989

Filed:

Jul 24, 1987

Appl. No.:

7/077168

Inventors:

Sara H. Anderson - Westmont IL
Noel F. Lutgen - Dowyers Grove IL

Assignee:

Liquid Air Corporation - Walnut Creek CA

International Classification:

C22B 900

US Classification:

75 96

Abstract:

Liquid argon, nitrogen or carbon dioxide is poured onto the surface of a bath of molten metal in a furnace. According to the invention, liquefied gas is discharged onto the surface in an amount which ranges from about 0. 025 to 0. 060 lb/cu. in. of metal in the furnace, while a skirt is preferably set around the open end of said furnace. Oxygen concentration above the bath remains lower than about 3. 0%, while hydrogen and nitrogen pick up are reduced.

US Patent:

51905779, Mar 2, 1993

Filed:

Dec 11, 1990

Appl. No.:

7/625955

Inventors:

Curtis L. Bermel - Chicago IL
Sara H. Anderson - Westmont IL
Daniel R. Urban - Westmont IL

Assignee:

Liquid Air Corporation - Walnut Creek CA

International Classification:

C21C 535

US Classification:

75552

Abstract:

In a method for decarburizing metals and alloys, a two-gas component mixture consisting only of oxygen and carbon dioxide is introduced into molten metals or alloys at least during the first decarburization phase.

US Patent:

48286095, May 9, 1989

Filed:

Mar 1, 1988

Appl. No.:

7/162655

Inventors:

Sara H. Anderson - Westmont IL
Jocelyne McGeever - LaGrange IL
Casey McGeever - LaGrange IL
Greg Carr - Indianapolis IN

Assignee:

Liquid Air Corporation - Walnut Creek CA

International Classification:

C22B 900

US Classification:

75 96

Abstract:

Inert liquid gas such as liquid nitrogen or liquid argon is used in vertical melting furnaces to prevent oxidation of the metal during holding periods. The method can be applied to any kind of metal. The use of inert liquid gas for the "blow-dow" of the furnace will flush art all existing furnace atmosphere and prevent oxidation. The casting recovery time may be reduced from about one hour to 15 minutes. Also the layers of oxide resulting from oxidation can be negated, allowing for fewer rejects, if any, during further surface treatment.

US Patent:

49901834, Feb 5, 1991

Filed:

Aug 24, 1989

Appl. No.:

7/397976

Inventors:

Sara H. Anderson - Westmont IL
Noel Lutgen - Igny, FR
Jean Foulard - Ablon, FR

Assignee:

L'Air Liquide - Paris
Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges
Claude - Paris
Liquid Air Corporation - Walnut Creek CA

International Classification:

G21C 534

US Classification:

75555

Abstract:

The present invention relates to a process for producing steel in a ladle furnace in which the molten steel is stirred by injection of an inert gas in the lower part of the furnace. According to the invention, the stirring of the bath of steel is effected by the injection of gaseous argon so as to distribute in a homogeneous manner the additives added and the metal temperature in the course of the treatment, while there is simultaneously injected liquid argon above the surface of the bath in the region of intumescence. In this way, substantially any increase in the concentration of nitrogen of the bath of steel in the course of the treatment is avoided. In some cases, and in particular when wires of the type filled with silico-calcium are employed, a reduction in the concentration of nitrogen in the bath of steel is found.

Author:

Sara Anderson

ISBN #:

0525444017

Author:

Sara Anderson

ISBN #:

0525444041

Author:

Sara Anderson

ISBN #:

1929766211

Author:

Sara Long Anderson

ISBN #:

0323003907

Author:

Sara Long Anderson

ISBN #:

0323017258

Author:

Sara Long Anderson

ISBN #:

0534524109

Author:

Sara Long Anderson

ISBN #:

0534527094

Author:

Sara Long Anderson

ISBN #:

0534558674