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

A heat-insulating agent and surface temperature technology, which is applied in the field of molten steel surface heat-insulating agents, can solve problems such as the increase of product surface defects

Active Publication Date: 2012-08-29
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

[0029] The present invention will be described below based on examples, but the conditions of the examples are examples of conditions employed to confirm the feasibility and effects of the present invention, and the present invention is not limited to these example conditions.

[0030] As long as the present invention does not deviate from the purpose of the present invention and the purpose of the present invention can be achieved, various conditions and combinations of conditions can be adopted.

[0031] Molten iron pretreatment, converter decarburization, and RH vacuum degassing are performed on molten steel with a loading capacity of 280t at one time to smelt ultra-low carbon steel. A tundish with a capacity of 60t was used to make a slab by continuous casting. Continuous casting was performed on 15 charges of molten steel. The surface temperature of molten steel is set at 1560-1580°C. The molten steel surface heat preservation agent of the present invention or the compa...

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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 two or more kinds of high melting point materials that have a melting point higher than the surface temperature of the molten steel, while containing 10-70% by mass of CaO, 10-60% by mass of Al2O3, 5-30% 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 30-100 [mu]m in an amount of not less than 70% by mass.

Description

technical field [0001] The present invention relates to a molten steel surface heat-retaining agent for covering 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 refined. [0002] This application claims priority based on Japanese Patent Application Japanese Patent Application No. 2009-280206 filed on December 10, 2009, and the content thereof is incorporated herein. Background technique [0003] Conventionally, when transferring molten steel through a tundish or ladle for continuous casting or performing refining treatment, the surface of molten steel is covered with a molten steel surface insulating agent to prevent heat dissipation of molten steel and intrusion of outside air. As the surface insulation agent of molten steel, SiO is widely used 2 and C as the main ingredients of roasted chaff (baked chaff). In the c...

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
CPCB22D11/111C21C7/005B22D11/108B22D1/00C21C7/00
Inventor 沟口利明三木大辅内山德彦
Owner NIPPON STEEL CORP
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