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Method for laser cladding Co-based alloy coating at blast-furnace tuyere

A technology of laser cladding and high-temperature alloys, which is applied in the coating process of metal materials, coatings, tuyere, etc., can solve the problems that the performance is difficult to meet the needs of actual use, the hardness of the multi-component co-infiltration layer is low, and the high temperature resistance is poor. , to achieve excellent wear resistance and high temperature oxidation resistance, improve hardness, and inhibit cracking

Active Publication Date: 2009-09-02
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese Patent Publication No. 2203977 discloses a dual-cavity combined blast furnace tuyere with equal flow, which solves the problem of the dead angle of the tuyere water flow
Although the above technologies have realized the metallurgical combination of the alloy strengthening layer and the matrix, the multi-component co-infiltration layer has defects such as low hardness, poor high temperature resistance, and poor thermal fatigue resistance, and the prepared infiltration layer has a certain gradient, and the actual effective infiltration layer is relatively low. Thin
[0006] To sum up, due to the limitations of processing methods, the existing blast furnace tuyere modification technology is still difficult to meet the needs of actual use in terms of performance. In production, there is an urgent need for a method that can significantly Improve the surface wear resistance of the tuyere, and the effective working layer and the substrate are firmly bonded, and the method is low in cost

Method used

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Embodiment 1

[0027] In the present invention, the laser cladding Co50 alloy coating is applied to the working face of the tuyere of the blast furnace tuyere, and the process includes the following steps:

[0028] (1) The copper matrix of the tuyere of the blast furnace tuyere is pickled to remove rust, and then the tuyere is placed in 80g / l H at room temperature. 2 SO 4 Soak in the air for 1 minute to activate it, use gas argon arc welding to pre-deposit nickel-based superalloy on the surface of the activated air outlet, the thickness of the primer alloy coating is 1.0mm, and the surface of the pre-deposited coating is polished and cleaned with acetone , to achieve smooth and clean surface of the workpiece to be treated; (2) Co50 cladding alloy powder particle size is 58 ~ 104 μm, after drying for use; (3) Laser cladding process: the pretreated blast furnace tuyere is pretreated at 350 ° C After heating for 4 hours, it is fed by TJ-HL-T5000 cross-flow CO 2 A complete set of equipment con...

Embodiment 2

[0030] The present invention laser cladding Co 50 alloy coating on the air outlet working surface of blast furnace tuyeres, the process comprises the following steps:

[0031] (1) The copper matrix of the tuyere of the blast furnace tuyere is pickled to remove rust, and then the tuyere is placed in 80g / l H at room temperature. 2 SO 4 Immerse in medium for 1.5 minutes to activate it, use gas argon arc welding to pre-deposit nickel-based superalloy on the surface of the activated air outlet, the thickness of the primer alloy coating is 0.8mm, and the surface of the pre-deposited coating is polished and cleaned with acetone , to achieve smooth and clean surface of the workpiece to be treated; (2) Co50 cladding alloy powder particle size is 58 ~ 104 μm, after drying for use; (3) Laser cladding process: the pretreated blast furnace tuyere is pre-treated at 450 ° C After heating for 2 hours, it is fed by TJ-HL-T5000 cross-flow CO 2 A complete set of equipment consisting of lasers,...

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Abstract

The invention discloses a method for laser cladding Co-based alloy coating on the surface of a blast-furnace tuyere, which includes the following steps of: (1) preprocessing the surface of an air outlet of the blast-furnace tuyere; (2) praying predeposited base alloy on the surface of the air outlet; (3) before being fed into a CO2 laser, preprocessing a blast-furnace tuyere workpiece; (4) feeding powder in a backward synchronous way or a coaxial way, and then multi-pass cladding Co-based alloy powder at the work layer of the air outlet of the blast-furnace tuyere which is predeposited by the gas argon arc welding by the CO2 laser; simultaneously, protecting the region which is processed in the laser cladding way by inert gases; and (5) follow-up processing. Under the premise of not affecting the thermal conductance of the copper matrix, the method can obtain the coating with high-hardness, wear-resistance and high temperature oxidation-resistance and can make the coating firmly bonded with the matrix in a metallurgical way; therefore, the method can significantly prolong the service life of the blast-furnace tuyere. In addition, the method has the advantage of low cost and can be used in the partial restoration of a waste blast-furnace tuyere.

Description

technical field [0001] The invention belongs to the technical field of blast furnace tuyere surface strengthening, and in particular relates to a method for preparing a cobalt-based alloy coating on the surface of a blast furnace tuyere by laser cladding. Background technique [0002] Blast furnace tuyeres have a special status in the equipment necessary for blast furnace smelting air supply, and the length of service life directly affects whether the blast furnace can keep running smoothly, obtain high production and reduce ironmaking costs. The working environment of the air outlet is extremely harsh, it has to withstand the high-speed scour of high-temperature hot air, the impact and erosion of high-temperature coke, and the wear and tear of coal powder under the condition of coal powder injection. In addition, because the temperature of the cooling water in the blast furnace tuyere is very low, the outer surface of the tuyere wall has to bear the high temperature radiati...

Claims

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Application Information

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IPC IPC(8): C21B7/16C23C24/10C22F1/00
Inventor 颜永根何宜柱张晖陆明和顾之毅
Owner BAOSHAN IRON & STEEL CO LTD
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