Method for manufacturing spinel composite monoblock stopper for continuous casting of low-carbon free-cutting steel

A free-cutting steel and spinel technology, which is used in foundry equipment, manufacturing tools, casting melt containers, etc. Strength, the effect of ensuring the erosion resistance of hot molten steel

Inactive Publication Date: 2011-05-04
北京利尔高温材料股份有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the extension of casting time and the deterioration of casting conditions, especially the need to smelt high-quality low-carbon free-cutting steels such as Y12, Y15 and other steels, ordinary spinel carbon materials have a large amount of erosion and erosion during use. , it is difficult to meet the actual needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: 36% of bauxite in the rod aluminum carbon material, 35% of corundum, 22% of graphite, 4% of SiC, 3% of Si; 84% of spinel in the rod head spinel material, graphite 8%, aluminum-silicon alloy powder 3%, activated alumina powder 5%, the silicon content in the aluminum-silicon alloy powder is 30%, the adding height of transition material is 30mm in this embodiment, wherein the rod head and rod body material added The raw materials are uniformly mixed according to the proportion respectively, and then obtained by vacuum granulation; the pressure of isostatic pressing is 115MPa, and the stopper blank is heat-treated in a reducing atmosphere at a heat-treatment temperature of 970°C.

Embodiment 2

[0018] Example 2: 37% of bauxite in the rod body aluminum carbon material, 35% of corundum, 24% of graphite, 2% of SiC, 2% of Si; 85% of spinel in the rod head spinel material, graphite 7%, aluminum-silicon alloy powder 2%, activated alumina powder 6%, wherein the silicon content in the aluminum-silicon alloy powder is 20%, the adding height of the transition material is 30mm in this embodiment, wherein the rod head and rod body added The materials are prepared by uniformly mixing the raw materials according to the proportion, and then vacuum granulation; the isostatic pressing pressure is 120MPa, and the stopper blank is heat-treated in a reducing atmosphere at a temperature of 980°C.

Embodiment 3

[0019] Example 3: 36% of bauxite in the rod body aluminum carbon material, 34% of corundum, 25% of graphite, 3% of SiC, 2% of Si; 86% of spinel in the rod head spinel material, graphite 6%, aluminum-silicon alloy powder 2%, activated alumina powder 6%, wherein the silicon content in the aluminum-silicon alloy powder is 30%, the addition height of the transition material is 30mm in this embodiment, wherein the added rod head and rod body The materials are prepared by uniformly mixing the raw materials according to the ratio, and then vacuum granulation; the isostatic pressing pressure is 125MPa, and the stopper blank is heat-treated in a reducing atmosphere at a temperature of 1000°C.

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PUM

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Abstract

The invention provides a method for manufacturing a spinel composite monoblock stopper for the continuous casting of low-carbon free-cutting steel, belonging to the field of a novel refractory material for continuous casting. The body of the monoblock stopper is made from an alumina-carbon material, the head of the monoblock stopper is made from spinel composite material, and the part between the body and head of the monoblock stopper is made from the mixed transitional material of the alumina-carbon material and the spinel composite material. The main raw material of the head of the monoblock stopper is fused spinel, and the auxiliary raw material comprises 2-6 percent of aluminum-silicon alloy powder, 2-5 percent of activated alumina micropowder and 5-9 percent of graphite. In the invention, the content of the graphite in the spinel composite material is reduced, and the aluminum-silicon alloy powder which can promote the resintering of the material in situ in the heat treatment process and the activated alumina micropowder which can form in-situ spinel in the heat treatment process are added to the spinel composite material to improve the compactness and strength of the material of the head of the monoblock stopper and ensure the hot molten steel erosion resistance of the material of the head of the monoblock stopper during use.

Description

Technical field [0001] The invention belongs to the field of novel continuous casting functional refractory materials and provides a method for manufacturing a spinel composite integral stopper for continuous casting. Background technique [0002] The integral stopper rod is installed in the continuous casting tundish. During operation, the flow of molten steel from the tundish to the crystallizer in the continuous casting process is controlled by adjusting the gap between the integral stopper rod head and the integral submerged nozzle or the upper nozzle bowl of the tundish. , to ensure the stability of the molten steel in the crystallizer and the stability of the continuous casting process. Its specifications vary according to different tundishes, and the structure can also be designed to blow argon at the tip of the rod, that is, argon is introduced from the center of the connecting rod of the stopper rod and blown out at the tip of the rod, which can reduce the inclusion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D41/18
Inventor 王次明焉凤明王晓东冯改山徐延庆张建超赵继增田海玉
Owner 北京利尔高温材料股份有限公司
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