Agent for maintaining surface temperature of molten steel and method for maintaining surface temperature of molten steel

A technology of heat preservation agent and surface temperature, applied in the field of molten steel surface heat preservation agent, which can solve problems such as the increase of surface defects of products

Active Publication Date: 2012-10-31
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the case of using roasted chaff as an insulating agent on the surface of molten steel, due to the SiO 2 Reacts with Al in molten steel to form Al 2 o 3 It is an inclusion, so there is a problem that the surface defects of the product increase

Method used

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  • Agent for maintaining surface temperature of molten steel and method for maintaining surface temperature of molten steel
  • Agent for maintaining surface temperature of molten steel and method for maintaining surface temperature of molten steel
  • Agent for maintaining surface temperature of molten steel and method for maintaining surface temperature of molten steel

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Embodiment

[0031] Hereinafter, the present invention will be described based on examples, but the conditions of the examples are examples of conditions adopted to confirm the possibility and effect of the present invention, and the present invention is not limited to these example conditions.

[0032] As long as the present invention does not deviate from the purpose of the present invention and can achieve the object of the present invention, various conditions and even combinations of conditions can be adopted.

[0033] The molten steel with a filling volume of 280t is subjected to molten iron pretreatment, converter decarbonization, and RH vacuum degassing treatment to smelt extremely low carbon steel. A tundish with a capacity of 60t is used to produce cast slabs by continuous casting. Continuous casting of molten steel with 15 fillings. The surface temperature of molten steel is set to 1560 to 1580°C. The surface insulation agent for molten steel of the present invention or comparative...

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Abstract

Disclosed is an agent for maintaining the surface temperature of molten steel, which is applied over the surface of molten steel that has a predetermined surface temperature. The agent for maintaining the surface temperature of molten steel contains not less than 50% by mass of a low melting point material that has a melting point lower than the surface temperature of the molten steel and less than 50% by mass of a high melting point material that has a melting point higher than the surface temperature of the molten steel, while containing 10-60% by mass of CaO, 10-70% by mass of Al2O3, 3-30% by mass of MgO and 0-10% by mass of SiO2 so that the total is not less than 70% by mass and the ratio of CaO to Al2O3, namely CaO/Al2O3 is 0.5-2.0. The agent for maintaining the surface temperature of molten steel has a melting point lower than the surface temperature of the molten steel, and is composed of a powder that contains particles having a particle diameter of 200-1000 [mu]m in an amount of not less than 70% by mass.

Description

Technical field [0001] The present invention relates to a surface insulating agent for molten steel that covers the surface of molten steel for the purpose of heat insulation and heat preservation or prevention of air oxidation when molten steel is transferred through a ladle or a tundish for continuous casting, or is subjected to refining treatment. [0002] This application claims priority based on Japanese Patent Application No. 2009-280205 filed on December 10, 2009, and the content is quoted here. Background technique [0003] Conventionally, when the molten steel is transferred through a tundish or ladle for continuous casting, or is refining, the surface of the molten steel is covered with a molten steel surface insulating agent to prevent the heat dissipation of the molten steel and the intrusion of outside air. As an insulating agent for the surface of molten steel, SiO is widely used 2 Baked chaff with C as the main ingredient. In the case of using roasted chaff as an in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/108B22D1/00B22D7/10B22D11/111C21C7/00
CPCC21C7/005B22D11/111B22D7/10B22D1/00B22D11/108C21C7/00
Inventor 沟口利明三木大辅内山德彦
Owner NIPPON STEEL CORP
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