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Heat treatment furnace for metal chunk, method for repairing heat treatment furnace for metal chunk, and method for producing infill for hearth used for heat treatment furnace for metal chunk

A technology for heat treatment furnaces and manufacturing methods, applied to furnaces, lining repairs, furnace components, etc., can solve problems such as low strength and corrosion resistance, and reduced heat insulation, so as to prevent the decline of fire resistance or heat insulation, and suppress fire resistance or the effect of a decrease in thermal insulation

Active Publication Date: 2013-05-15
NIPPON STEEL CORP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the refractories constituting the heat-insulating layer (hereinafter also referred to as heat-insulating layer refractory materials) generally contain many bubbles, so their strength and corrosion resistance are low. Deterioration, reduced thermal insulation

Method used

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  • Heat treatment furnace for metal chunk, method for repairing heat treatment furnace for metal chunk, and method for producing infill for hearth used for heat treatment furnace for metal chunk
  • Heat treatment furnace for metal chunk, method for repairing heat treatment furnace for metal chunk, and method for producing infill for hearth used for heat treatment furnace for metal chunk
  • Heat treatment furnace for metal chunk, method for repairing heat treatment furnace for metal chunk, and method for producing infill for hearth used for heat treatment furnace for metal chunk

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Embodiment

[0152] Next, examples for confirming the effects of the heat treatment furnace for metal ingots and the repairing method thereof according to the present invention will be described. First, the used refractory castable material (alumina-magnesia-based castable refractory material) used in the ladle of the steelmaking process is used, and the substrate attached to the used refractory castable material is chiseled. Metal and slag removal. Then, crush it with a jaw crusher so that the maximum particle size of the granular refractory material reaches 50mm. This crushing is carried out by throwing a block of the used refractory castable material between the paired tooth plates of the jaw crusher, so that a compressive force is mainly applied to the used refractory castable material. In addition, the so-called maximum particle size of the granular refractory material is 50 mm, which means that after the granular refractory material is screened once with a sieve with a nominal mesh ...

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Abstract

Provided is a heat treatment furnace for a metal chunk, provided with a hearth structure having a filling layer of granular refractory on the furnace operation surface side, wherein the filling rate of the granular refractory is 65-100 volume %, and the thickness of the filling layer is more than twice the maximum gain size of the granular refractory.

Description

technical field [0001] The present invention relates to various furnaces for heat-treating metal ingots, such as heat-treating furnaces for metal ingots such as holding furnaces for continuously cast slabs, heating furnaces for hot-rolled slabs, and annealing furnaces for steel plates, and heat-treating furnaces for metal ingots. A method for repairing and a method for manufacturing a hearth filling material used in a heat treatment furnace for metal ingots. Background technique [0002] Generally, the side exposed to the furnace (hereinafter also referred to as the working surface in the furnace) of the hearth of a furnace (hereinafter also referred to as a heat treatment furnace) for heat treatment of metal ingots is mostly composed of a refractory layer, and a heat insulating layer is installed on the back side. layer. The purpose of providing the heat-insulating layer in the heat-treating furnace in this way is to achieve the heat-insulating properties of the heat-treat...

Claims

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Application Information

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IPC IPC(8): F27D1/16F27D1/00
CPCF27D1/1621F27D1/16F27D1/00
Inventor 板楠元邦河野幸次
Owner NIPPON STEEL CORP
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