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Surface reinforcing method for tuyere of blast furnace

A technology of surface strengthening and tuyere, applied in the direction of tuyere, superimposed layer coating, coating, etc., can solve the problem of frequent burning of blast furnace tuyere, etc., to improve service life, improve economic benefits, and make up for poor high temperature resistance. Effect

Inactive Publication Date: 2007-06-06
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually only one surface strengthening technology is used, which cannot effectively solve the frequent burning of blast furnace tuyere

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] On the surface of the tuyere of the blast furnace, the co-infiltration alloy elements are strengthened, and the co-infiltration elements are Cu-Al-Fe, Cu-Al-Fe-W or Cu-Al-Fe-W+rare earth elements or Al-Si-Cr or Al-Si- Cr + rare earth elements, co-infiltration temperature 600-900 ℃, holding time 3-10h; then use plasma arc spraying: plasma spraying Al 2 o 3 The process parameters are as follows: power 20 ~ 25kW, working gas flow N 2 2.5m 3 / h, H 2 0.3m 3 / h, powder feeding air flow N 2 0.5m 3 / h, powder feeding rate 1~1.5kg / h, powder particle size 220~320 mesh. The bonding strength of the coating is about 60-90N / mm 2 .

Embodiment 2

[0018] Adopt the surface of the blast furnace tuyere of embodiment 1 to carry out co-infiltration alloy element strengthening, plasma spraying ZrO 2 The process parameters are as follows: power 22 ~ 28kW, working gas flow N 2 2.0m 3 / h, H 2 0.3m 3 / h, powder feeding air flow N 2 0.6m 3 / h, powder feeding rate 1kg / h, powder particle size 160-320 mesh. The bonding strength of the coating is about 60-90N / mm 2 .

Embodiment 3

[0020] Adopt the surface of the blast furnace tuyere of embodiment 1 to carry out co-infiltration alloy element strengthening, plasma spraying Al 2 o 3 +Ni or TiC+Ni or WC+Co process parameters are as follows: power 18 ~ 24kW, working gas flow N 2 2.0m 3 / h, H 2 0.3m 3 / h, powder feeding air flow N 2 0.6m 3 / h, powder feeding rate 1kg / h, powder particle size 140-260 mesh. The bonding strength of the coating is about 60-90N / mm 2 .

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PUM

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Abstract

The present invention is surface reinforcing method for tuyere of blast furnace. The technological scheme of the present invention includes co-permeating alloy elements to reinforce the surface of tuyere and form surface copper alloy layer; and hot spraying to the surface of copper alloy layer to form a surface reinforcing layer. The method of the present invention has no high temperature falling-off of the coating and reinforcement on the co-permeated layer. The tuyere has excellent heat conducting performance, reinforced surface and long service life.

Description

technical field [0001] The invention relates to a method for strengthening the surface of a tuyere of a blast furnace. Background technique [0002] With the increasingly severe energy, energy-saving technology has attracted more and more attention. Ironmaking energy-saving technology represented by blast furnace coal injection is one of them. Among them, the tuyere is the key component of blast furnace smelting pig iron production. Due to the continuous improvement of the blast furnace smelting intensity and the application of coal injection technology, the working environment of the blast furnace tuyere is even harsher. It is located in the blast furnace hearth with a temperature above 2000 ° C, and bears the impact of radiation and convection in the high temperature zone; Erosion of liquid slag iron and materials at about 1500°C; hot air of 900°C to 1300°C passes through the tuyeres; strong oxidation and infiltration of trace elements ex...

Claims

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Application Information

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IPC IPC(8): C23C28/00C23C10/00C23C4/00C23C4/10C21B7/16C23C4/06C23C4/11C23C4/129C23C4/131C23C4/134
Inventor 李云涛张建褚亮
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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