Achilles B Vassilicos

US Patent:

57333580, Mar 31, 1998

Filed:

Sep 11, 1995

Appl. No.:

8/526448

Inventors:

Gordon H. Geiger - Minneapolis MN
Asish K. Sinha - Cranberry Twp. PA
Achilles Vassilicos - Pittsburgh PA
Zhiyou Du - Croton-on-Husdon NY

Assignee:

USX Corporation and Praxair Technology, Inc.

International Classification:

C21C 534

US Classification:

75501

Abstract:

A two stage reaction for the production of steel from iron carbide is carried out in two separate but interrelated reactors. In the first reactor, iron carbide, with slag formers, is fed into a feed end and the reaction is well-mixed by the vessel geometry, the stirring action below-surface injection of oxygen and iron carbide feed, and the evolution of gases from the liquid metal bath. The product, containing about 0. 5-2% carbon, is fed into the second reactor where it is refined with subsurface-injected oxygen. The second reaction is autogenous, and the evolved carbon monoxide is fed to the first reactor where it is burned with oxygen in a foamy slag, which, with post-combustion burning in the slag of CO evolved in the first reactor, and with iron carbide preheating with the sensible heat of the off-gas from the first reaction, makes that reaction also essentially autogenous.

US Patent:

56700750, Sep 23, 1997

Filed:

Jan 22, 1996

Appl. No.:

8/589392

Inventors:

Achilles Vassilicos - Pittsburgh PA

Assignee:

USX Corporation - Pittsburgh PA

International Classification:

B22D 4124
B22D 4128
B22D 4142

US Classification:

222603

Abstract:

In the continuous casting of steel, gas is prevented or inhibited from contacting molten steel through the valve slide plate by feeding inert gas through channels in the slide plate and adjacent parts; the channels contain porous refractory inserts and can be connected to outside sources through juxtaposed side channels.

US Patent:

58853251, Mar 23, 1999

Filed:

Aug 18, 1997

Appl. No.:

8/914607

Inventors:

Gordon H. Geiger - Minneapolis MN
Asish K. Sinha - Cranberry Township PA
Achilles Vassilicos - Pittsburgh PA
Zhiyou Du - Croton-on-Hudson NY

Assignee:

USX Corporation - Pittsburgh PA

International Classification:

C21C 534

US Classification:

75501

Abstract:

A two stage reaction for the production of steel from iron carbide is carried out in two separate but interrelated reactors. In the first reactor, iron, carbide, with slag formers, is fed into a feed end and the reaction is well-mixed by the vessel geometry, the stirring action below-surface injection of oxygen and iron carbide feed, and the evolution of gases from the liquid metal bath. The product, containing about 0. 5-2% carbon, is fed into the second reactor where it is refined with subsurface-injected oxygen. The second reaction is autogenous, and the evolved carbon monoxide is fed to the first reactor where it is burned with oxygen in a foamy slag, which, with post-combustion burning in the slag of CO evolved in the first reactor, and with iron carbide preheating with the sensible heat of the off-gas from the first reaction, makes that reaction also essentially autogenous.

US Patent:

51604809, Nov 3, 1992

Filed:

Jun 3, 1991

Appl. No.:

7/709468

Inventors:

Achilles Vassilicos - Pittsburgh PA

Assignee:

USX Corporation - Pittsburgh PA

International Classification:

B22D 4100
B22D 4102

US Classification:

266275

Abstract:

A pouring pad is provided for use in a tundish during sequence continuous casting. The pouring pad has a plurality of concentric primary ridge portions adjacent to the location of impact of a pouring stream from a ladle with the pad. The primary ridge portions are of a height within a range for creating pockets of recirculation so as to dissipate turbulence without deflection of molten metal from its radially outward flow along the pad. The radial spacing between adjacent primary ridge portions as measured between top inner edge surfaces at corresponding radial points is at least 2. 0 times the height of the inner of the adjacent primary ridge portions.

US Patent:

56761953, Oct 14, 1997

Filed:

Jul 27, 1995

Appl. No.:

8/508261

Inventors:

Achilles Vassilicos - Pittsburgh PA

Assignee:

USX Corporation - Pittsburgh PA

International Classification:

B22D 1110
B22D 4158

US Classification:

164475

Abstract:

Ingress of gas such as air through the joint of a pour tube and tube holder of a continuous caster is prevented or inhibited by passing an inert gas into a circumferential channel around the orifice and at the interface of the joint; the gas is evenly distributed within the channel over the entire configuration of a porous refractory insert in the circumferential channel; the porous refractory insert assures even distribution of the gas to the desired location in the joint.