Lining for metallic heat treating furnace

Abstract

The present invention relates to one kind of liner of metal heat treatment furnace. The inner includes one first heat insulating layer with fiber cotton; one second heat insulating layer bricked up with light refractory bricks of density 0.8 g / cu cm; and one working layer bricked with light heat insulating refractory bricks of density 1.0-1.4 g / cu cm, normal compressive strength not lower than 8 MPa, heat shock more than 15 times, permanent linear change after heating at 1350 deg.c for 12 hr not greater than 1 % and heat conductivity at 350+ / -25 deg.c not higher than 0.41W / m*K. The working layer is bricked up with light heat insulating refractory bricks or pressed with the mixture of clay, polyethylene and organic ablative material. The present invention has the features of high strength, high heat shock performance, simple construction process, light weight and low cost.

Description

1. Technical field [0001] The invention belongs to the inner lining system of metal heat treatment furnaces, in particular to an inner lining for metal heat treatment furnaces such as heating furnaces, soaking furnaces and forging furnaces. 2. Background technology [0002] Heating furnaces, soaking furnaces, and forging furnaces are all used as metal heat treatment furnaces for heating blooms, continuous casting billets, steel ingots, etc. to the temperature required for hot rolling or forging. With the continuous progress of rolling technology , its role and function in the steel rolling system are becoming more and more important. However, what is incompatible with it is that the lining structure of these metal heat treatment furnaces, especially the working layer, has not been significantly improved, which affects energy saving and efficiency enhancement. [0003] The heating temperature of existing metal heat treatment furnaces is generally about 1000 ° C ~ 1350 ° C, a...

AI Technical Summary

Problems solved by technology

However, what is incompatible with it is that the lining structure of these metal heat treatment furnaces, especially the working layer, has not been significantly improved, which affects energy saving and efficiency enhancement.

[0003] The heating temperature of existing metal heat treatment furnaces is generally about 1000 ° C ~ 1350 ° C, and the lining working layer is heavy clay bricks, heavy high alumina bricks, heavy castables or plastic ramming materials, etc. The heat insulation of these materials The thermal insulation performance is poor, and the bulk density is high, resulting in increased energy consumption, furnace weight and steel structure weight, which cannot meet the requirements of energy saving and consumption reduction

In the existing metal heat treatment furnaces with a heating temperature of about 1000°C, fiber cotton is generally used as the lining working layer directly, but fiber cotton is easy to pulverize, it is difficult to degrade after disassembly and discarded, damages the environment, and is expensive; fiber dust during construction Easy to invade the human body and damage the health of workers

In addition, a large amount of electric energy is consumed in the process of producing fiber cotton, and fiber production itself is not energy-saving.

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