HEAT INSULATION AGENT FOR MOLTEN STEEL IN CONTAINER

Japanese Patent JP3393803

B2

PROBLEM TO BE SOLVED: To prevent the pick-up of oxygen of the molten steel in a container, and to surely achieve the heat insulation by covering a solid heat insulation agent of the prescribed composition consisting of CaO, Al2O3 and MgO on an upper layer of the liquid phase heat insulation agent of the prescribed composition consisting of CaO, Al2O3, MgO and SiO2.
SOLUTION: A liquid phase heat insulation agent having the softening point lower than the general temperature of the molten steel is arranged on a surface of the molten steel in the container, and a solid heat insulation agent which is not reacted with the liquid phase heat insulation agent and not melted on its upper layer. The liquid phase heat insulation agent consists of CaO and Al2O3 with their content ratio CaO/Al2O3: 0.5-1.0, 5-30 wt.% MgO, and 10-20% Si. The solid heat insulation agent consists of CaO and Al2O3 with their content ratio CaO/Al2O3: below 0.5 or over 2.0, and 50-90% MgO. The coating of the solid heat insulation agent is preferably executed at the heat insulation part of the surface of the molten steel in the container, for example, in the vicinity of an inlet opening/closing stopper, in the vicinity of an inner wall, and the vicinity of a molten steel pouring nozzle immersion position.

Toshiaki Mizoguchi
Yoshiyuki Ueshima
Masaki Iwasaki
Katsuhiro Sasai

JP35468497A

April 07, 2003

December 24, 1997

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Nippon Steel Corporation

B22D11/10; B22D7/10; B22D11/108; B22D11/111; C04B35/00; C21C7/00; (IPC1-7): B22D11/108; B22D7/10; C04B35/00; C21C7/00

JP833960A
JP7124741A
JP4317451A
JP3198953A
JP751822A
JP6179059A
JP6170508A
JP6170507A
JP5337617A
JP5293616A
JP5662662A
JP624832A

Akio Najima (2 others)

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