Refractory material for submersed nozzle inner hole body

A refractory, immersion technology, applied in the field of automotive steel, can solve the problems of not fully meeting the requirements of use, thermal shock resistance, etc., and achieves the effect of less difficulty in production, good anti-clogging effect, and good thermal shock resistance.

Inactive Publication Date: 2016-10-05
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology

However, this kind of material still has the problem of poor therma

Method used

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  • Refractory material for submersed nozzle inner hole body

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with specific examples.

[0015] The manufacturing method of the inner hole body of the submerged nozzle of the present invention is as follows: calcium hexaaluminate, calcium dialuminate and aluminum-magnesium spinel are used as main raw materials, and phenolic resin is used as a binder. After granulation and drying, it is compounded with aluminum carbon body and zirconium carbon slag wire. After isostatic pressing, it is fired in a non-oxidizing atmosphere. The firing temperature is between 900 ° C and 1200 ° C to produce the required submerged nozzle.

[0016] Table 1 lists the composition (weight percent) and characteristics of the porous material of the present invention; Table 2 lists the composition (weight percent) and characteristics of the comparative example.

[0017] Composition (percentage by weight) and characteristics of the present embodiment of table 1

[0018]

[0019] Table 2 Co...

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Abstract

The invention relates to a refractory material for a submersed nozzle inner hole body. The refractory material is used for an aluminum-killed steel continuous casting nozzle and particularly for casting of ultra-low-carbon automotive steel with high aluminum content. The refractory material for the submersed nozzle inner hole body is prepared from, by weight, 28%-58% of calcium hexaluminate, 20%-40% of calcium dialuminate, 20%-30% of alumina-magnesia spinel, 4%-6% of additionally added binding agent, namely, phenolic resin and the balance metallic silicon and boron carbide. The refractory material for the inner hole body has excellent alumina clogging resistance, molten steel erosion resistance and thermal shock resistance, can be used for aluminum-killed steel continuous casting and is relatively long in service life, and particularly, when the refractory material is used for casting of the ultra-low-carbon automotive steel with high aluminum content, secondary oxidation caused by the refractory material at the nozzle can be effectively reduced, and nozzle clogging caused by adhesion of alumina in molten steel can be effectively prevented.

Description

technical field [0001] The invention relates to a refractory material for an inner hole body of a submerged nozzle, which is used for an aluminum-killed steel continuous casting nozzle, especially ultra-low carbon steel with high aluminum content for automobiles. Background technique [0002] In addition to mechanical damage and corrosion of the aluminum carbon submerged nozzle, alumina blockage will also occur during the continuous casting process. Especially when casting aluminum-killed steel, it is often caused by Al in molten steel 2 o 3 Such inclusions are deposited on the inner wall of the nozzle and blockage occurs, which affects the continuous operation of continuous casting. At the same time, the inclusions adhered to the inner surface of the nozzle may fall off and fall into the molten steel during the casting process, resulting in non-metallic inclusions in the continuous casting slab, thereby affecting the quality of the continuous casting slab. The parts in t...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 金从进何平显王涛姚金甫赵明甘菲芳王峰
Owner BAOSHAN IRON & STEEL CO LTD
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