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Method for thermally spraying protective coating on surface of copper plate of continuous casting crystallizer

A technology of continuous casting crystallizer and crystallizer copper plate, which is applied in the direction of coating, metal material coating process, molten spraying, etc., and can solve the problems of restricting the mass application of thermal spraying technology, poor coating consistency and stability, etc. Achieve the effect of simple process operation and production, good overall consistency and strong binding force

Active Publication Date: 2010-08-11
SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, thermal spraying technology also has some shortcomings in practical application, such as poor coating consistency and stability, which seriously restricts the mass application of thermal spraying technology in the protective coating on the copper plate surface of continuous casting mold

Method used

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Examples

Experimental program
Comparison scheme
Effect test

comparative example 1

[0020] The sample is Cr-Zr-Cu alloy continuous casting crystallizer short-side copper plate regular use product, thermal spraying powder material alloy composition range: 0.4-1.0%C, 12-20%Cr, 2.5-4.0%B, 2.0-5.0 %Si, 12%W, ≤5%Fe, ≤4%Mo, ≤4%Cu, the balance being Ni; other methods are the same as this method.

[0021] Conclusion: Due to the high content of tungsten, the thermal spray coating on the surface is prone to cracks. Many tests have found that the qualified rate of thermal spray coating products is low, and it is difficult to realize mass industrialization.

comparative example 2

[0023] The sample is Cr-Zr-Cu alloy continuous casting mold short-side copper plate regular use product, thermal spraying powder material alloy composition range: 0.4-1.0%C, 1.0-4.0%B, 2.0-5.0%Si, ≤10% Cr, ≤5% Fe, ≤4% Mo, ≤4% Cu, the balance being Ni; other methods are the same as this method.

[0024] Conclusion: The qualified rate of thermal sprayed coating products is very high, but because it does not contain the reinforcing phase tungsten element, and the content of chromium element is also small; so its durability has not yet reached 70% of this method.

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Abstract

The invention discloses a method for thermally spraying a protective coating on the surface of a copper plate of a continuous casting crystallizer. The method comprises the following steps: pretreating the surface of the copper plate of the crystallizer; using an alloy powder material which consists of the following thermal spraying powder components in percentage by weight: 0.4 to 1.0 percent of C, 12 to 20 percent of Cr, 2.5 to 4.0 percent of B, 2.0 to 5.0 percent of Si, less than or equal to 10 percent of W, less than or equal to 5 percent of Fe, less than or equal to 4 percent of Mo, less than or equal to 4 percent of Cu and the balance of Ni and has a grain size of between 10 and 70 mu m; spraying the alloy powder material on the surface of the copper plate for the crystallizer by using an ultrasonic flame spraying device or a powder flame spraying device, wherein the thickness of the coat is between 0.1 and 1.2 millimeters; and performing thermal treatment with the following thermal treatment technical parameters that: a thermal treatment temperature is between 950 and 1,100 DEG C; and heat preservation time is between 10 and 50 minutes. The method has simple operation process, and the prepared coating has high bonding strength with a substrate body of the copper plate of the crystallizer and high consistency and stability.

Description

technical field [0001] The invention relates to a method for thermal spraying of a protective coating on the surface of a continuous casting crystallizer copper plate. Background technique [0002] Continuous casting is one of the advanced technologies in the modern iron and steel industry, and the mold is the core equipment of the continuous casting unit. Its quality directly affects the quality of the billet and the operating rate of the continuous casting machine. With the development of continuous casting technology towards high-speed, large-scale and automation, the requirements for mold copper plates are getting higher and higher: first, it has good thermal conductivity; second, it has strong anti-deformation ability; third, it has Sufficiently high surface wear resistance; therefore, modern continuous casting mold copper plates are almost always surface treated. [0003] At present, electroplating technology is most commonly used in the large-scale surface treatment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C23C4/12C23C4/02C23C4/18C23C4/129
Inventor 毕刚郝荣亮李益明赵娜
Owner SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE
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