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Submersed nozzle and preparation method thereof

An immersion, nozzle technology

Active Publication Date: 2012-07-25
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of too much graphite flakes brings the following four problems: (1) due to the dissolution of C in molten steel, the carburization of molten steel is serious, which greatly restricts the technological development of ultra-pure steel and special steel; (2) the material heat High conductivity leads to rapid temperature drop of molten steel and large heat loss; (3) low material strength, easy to damage under oxidative conditions, and large consumption of refractory materials; (4) carbon oxidation produces a large amount of CO2 Gas, exacerbating the greenhouse effect and consuming large amounts of carbon resources
"Continuous casting stopper head and submerged nozzle wrist material" (CN 200910051898.4) patented technology, although the carbon content has been reduced, but due to the addition of chromium oxide, it may cause environmental pollution problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A submerged nozzle and a preparation method thereof. Submerged nozzle raw materials include body raw materials and slag line raw materials:

[0016] The main raw materials and their contents are: 25~32wt% for tabular corundum, 16~20wt% for zircon mullite, α-Al 2 o 3 Micro powder is 28~32wt%, flake graphite is 6~8wt%, expanded graphite is 0.5~2wt%, SiC powder is 3.5~5wt%, elemental Si powder is 3~5wt%, B 4 C powder is 0.5~1.5wt% and thermosetting phenolic resin is 4~6wt%.

[0017] The raw materials and content of the slag line are: 70~75wt% of calcium oxide partially stabilized zirconia, 6~8wt% of flake graphite, 2~3.5wt% of expanded graphite, 3~5wt% of SiC powder, and 3~5wt% of Si powder. 3.5~5wt%, B 4 C powder is 2~3wt% and thermosetting phenolic resin is 4~6wt%.

[0018] In this embodiment: the expanded graphite in the bulk raw material and the slag line raw material is graphite obtained by treating graphite oxide with a particle size of less than 0.18mm at 900-1...

Embodiment 2

[0022] A submerged nozzle and a preparation method thereof. Submerged nozzle raw materials include body raw materials and slag line raw materials:

[0023] The main raw materials and their contents are: 32~38wt% for tabular corundum, 14~18wt% for zircon mullite, α-Al 2 o 3 Micro powder is 23~28wt%, flake graphite is 4~6wt%, expanded graphite is 2~3.5wt%, SiC powder is 2~3.5wt%, simple Si powder is 0.5~2wt%, B 4 C powder is 1.5~2.5wt% and thermosetting phenolic resin is 3~5wt%.

[0024] The raw materials and content of the slag line are: 75~80wt% of calcium oxide partially stabilized zirconia, 4~6wt% of flake graphite, 2~3.5wt% of expanded graphite, 3~5wt% of SiC powder, and 3~5wt% of Si powder. 2~3.5wt%, B 4 C powder is 1.5~2.5wt% and thermosetting phenolic resin is 3~5wt%.

[0025] In this embodiment: the expanded graphite in the bulk raw material is graphite oxide with a particle size of less than 0.18mm treated at 900-1100°C, and then impregnated with sol to form an an...

Embodiment 3

[0029] A submerged nozzle and a preparation method thereof. Submerged nozzle raw materials include body raw materials and slag line raw materials:

[0030] The main raw materials and their contents are: tabular corundum 38~45wt%, zircon mullite 10~14wt%, α-Al 2 o 3 Micro powder is 18~23wt%, flake graphite is 3~5wt%, expanded graphite is 3.5~5wt%, SiC powder is 1~2.5wt%, elemental Si powder is 2~3.5wt%, B 4 C powder is 2~3wt% and thermosetting phenolic resin is 5~8wt%.

[0031] The raw materials and content of the slag line are: 80~85wt% of calcium oxide partially stabilized zirconia, 4~6wt% of flake graphite, 3.5~5wt% of expanded graphite, 1~3wt% of SiC powder, and 0.5wt% of simple Si powder ~2wt%, B 4 C powder is 0.5~1.5wt% and thermosetting phenolic resin is 5~8wt%.

[0032] In this embodiment: the expanded graphite in the raw material of the body is graphite obtained by treating graphite oxide with a particle size of less than 0.18mm at 900-1100°C; the expanded graphit...

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Abstract

The invention relates to a submersed nozzle and a preparation method of the submersed nozzle. The technical scheme is that the main raw materials and contents are as follows: 25-50wt% of corundum, 6-20wt% of zircon mullite, 15-32wt% of alpha-Al2O3, 3-8wt% of crystalline flake graphite, 0.5-5wt% of expanded graphite, 1-5wt% of SiC powder, 0.5-5wt% of simple substance Si powder, 0.5-3wt% of B4C powder and 3-8wt% of thermosetting phenolic resin; raw materials and contents of a slag line part are as follows: 70-90wt% of stable zirconia in the calcium oxide part, 3-8wt% of crystalline flake graphite, 0.5-5wt% of expanded graphite, 1-5wt% of SiC powder, 0.5-5wt% of simple substance Si powder, 0.5-3wt% of B4C powder and 3-8wt% of thermosetting phenolic resin. The preparation method comprises thesteps of uniformly mixing the raw materials and pelletizing, moulding, sintering at 1050-1200 DEG C and under a reducing atmosphere, performing surface processing, and drying. The product is featuredwith low carbon content, high strength, excellent thermal shock resistance and slag corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a submerged nozzle and a preparation method thereof. Background technique [0002] In the process of continuous casting, in order to protect molten steel from secondary oxidation and prevent nitrogen or slag from immersing in molten steel, iron and steel enterprises use submerged nozzles for protective casting during the process of molten steel from the tundish to the crystallizer. Currently widely used Al 2 o 3 -C / ZrO 2 -C composite submerged nozzle: the main body is mainly made of Al 2 o 3 -C quality, ZrO is used in the slag line 2 -C quality composite material. The carbonaceous raw material of the carbon composite refractory is mainly flake graphite, and because its addition amount is generally 20-30wt%, it has good thermal shock stability and slag erosion resistance. However, the introduction of too much graphite flakes brings the following fou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66B22D41/50
Inventor 李亚伟朱天彬王庆虎桑绍柏别传玉赵雷李远兵金胜利李淑静
Owner WUHAN UNIV OF SCI & TECH
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