Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method for upper nozzle used for continuous casting

A technology of continuous casting and raw materials, which is applied in the field of preparation of upper nozzles for continuous casting. It can solve problems such as poor corrosion resistance of quartz nozzles, difficulty in meeting casting process requirements, and infiltration of molten steel into non-metallic inclusions, so as to prevent poor steel flow. Effects of even clogging, excellent slag resistance, and stable air permeability

Inactive Publication Date: 2014-05-07
WUXI SHENJIA HYDRAULIC TECH
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although fused silica can be used directly without baking, the quartz nozzle has poor corrosion resistance, which is not conducive to continuous pouring of multiple furnaces, and it is easy to make molten steel penetrate into non-metallic inclusions, which affects the quality of molten steel; aluminum carbon or aluminum carbon zirconium nozzles It is easy to block during use, which affects normal production; mullite upper nozzle has poor corrosion resistance; corundum and high alumina have poor thermal shock resistance and are easy to peel off during use
[0006] In recent years, the advanced casting technology of multi-furnace continuous casting and high-speed casting has been used to prevent air inhalation at the upper nozzle of the tundish, prevent aluminum oxide clogging, resist thermal shock peeling, corrosion resistance, wear resistance, high-strength mechanical properties, etc. Higher requirements have been put forward. None of the existing technical products can fully meet the comprehensive performance requirements of the upper nozzle use conditions for materials at the same time. The service life in the continuous casting process is limited, and it is difficult to meet the new casting process requirements. In addition, the molding process is more complicated. , higher manufacturing cost

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for preparing an upper nozzle for continuous casting, the upper nozzle is composed of inner and outer layers, and the raw materials of the inner layer are composed of the following raw materials in parts by weight: 76 parts of -200 mesh aluminum titanate, 14 parts of -200 mesh silicon nitride , 6 parts of -200 mesh aluminum nitride, 6 parts of phenolic resin; The raw material of outer layer is made up of following raw material by weight: 20-200 mesh porous mullite ceramic particles 30 parts, -200 mesh mullite fine powder 46 Parts, -200 mesh zircon mullite fine powder 6 parts, -200 mesh Cr 2 o 3 5 parts of fine powder, 4 parts of -200 mesh clay fine powder, 3 parts of -200 mesh activated α-alumina micropowder, 3 parts of silica sol, and the preparation method comprises the following steps:

[0019] 1) Mixing: mix and stir the inner layer and outer layer raw materials in the mixer according to the above ratio, and then granulate;

[0020] 2) Forming: isostatic ...

Embodiment 2

[0023] A method for preparing an upper nozzle for continuous casting. The upper nozzle is composed of two layers, an inner layer and an inner layer. The raw materials of the inner layer are composed of the following raw materials in parts by weight: 80 parts of -200 mesh aluminum titanate, 12 parts of -200 mesh silicon nitride , 8 parts of -200 mesh aluminum nitride, 4 parts of phenolic resin; The raw material of outer layer is made up of following raw material by weight: 20-200 mesh porous mullite ceramic particles 34 parts, -200 mesh mullite fine powder 42 8 parts, -200 mesh zircon mullite fine powder, -200 mesh Cr 2 o 3 3 parts of fine powder, 6 parts of -200 mesh clay fine powder, 1 part of -200 mesh activated α-alumina micropowder, 5 parts of silica sol, and the preparation method includes the following steps:

[0024] 1) Mixing: mix and stir the inner layer and outer layer raw materials in the mixer according to the above ratio, and then granulate;

[0025] 2) Forming:...

Embodiment 3

[0028] A method for preparing an upper nozzle for continuous casting, the upper nozzle is composed of two layers inside and outside, and the raw materials of the inner layer are composed of the following raw materials in parts by weight: 78 parts of -200 mesh aluminum titanate, 13 parts of -200 mesh silicon nitride , 7 parts of -200 mesh aluminum nitride, 5 parts of phenolic resin; The raw material of outer layer is made up of following raw material by weight: 20-200 mesh porous mullite ceramic particles 32 parts, -200 mesh mullite fine powder 44 7 parts, -200 mesh zircon mullite fine powder, -200 mesh Cr 2 o 3 4 parts of fine powder, 5 parts of -200 mesh clay fine powder, 2 parts of -200 mesh activated α-alumina micropowder, 4 parts of silica sol, and the preparation method includes the following steps:

[0029] 1) Mixing: mix and stir the inner layer and outer layer raw materials in the mixer according to the above ratio, and then granulate;

[0030] 2) Forming: isostatic ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a preparation method for an upper nozzle used for continuous casting. The upper nozzle is composed of an inner layer and an outer layer, wherein the inner layer comprises aluminum titanate, silicon nitride and aluminum nitride, and the outer layer comprises a porous mullite ceramic particle, fine mullite powder, fine zirconia mullite powder, fine Cr2O3 powder, fine clay powder and 200-mesh active alpha alumina micro powder. The preparation method comprises the following steps: 1) mixing: a step of respectively and uniformly mixing inner layer raw materials and outer layer raw materials in a mixer with stirring and carrying out granulation; 2) molding: a step of respectively subjecting the inner layer and the outer layer of the upper nozzle to compression molding through isostatic pressing; and 3) sintering: a step of drying a molded green body and sintering the green body in a reducing atmosphere at a temperature of 1460 to 1500 DEG C or in an anoxic environment. The upper nozzle has service life of more than 20 h and good thermal shock resistance and can effectively prevent alumina in molten steel from adhesion and accumulation in the inner cavity of the upper nozzle and prevent obstruction of steel flow.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy refractory materials, in particular to a method for preparing an upper nozzle for continuous casting. Background technique [0002] With the development of modern high-speed, high-efficiency continuous casting technology and clean steel smelting technology, further improving the performance of existing continuous casting functional refractory materials and developing new materials to meet the requirements of contemporary continuous casting technology are urgent problems to be solved at present. . The upper nozzle is a disposable refractory component used for continuous casting. It is installed at the bottom of the ladle or tundish, and the lower part is connected with the submerged nozzle. The upper nozzle is in direct contact with molten steel during use, so the use of the upper nozzle of the tundish is improved. The service life requires that its material should be able to wit...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 沈志坚
Owner WUXI SHENJIA HYDRAULIC TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com