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Surface repairing method for thin-strip continuous casting crystallizing roller or casting blank continuous casting crystallizer

A continuous casting mold and continuous casting crystallization technology, which is applied in the field of surface repair of thin strip continuous casting crystallizing rolls or slab continuous casting molds, can solve the problem of low hardness of pure nickel coating, general wear resistance, easy softening, etc. problems, to achieve uniform and efficient heat exchange process, enhance the bonding force of the coating, and reduce the internal stress of the coating

Inactive Publication Date: 2010-06-09
SHANGHAI BAOSTEEL EQUIP MAINTENANCE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hardness of this pure nickel coating is not high, it is easy to soften at high temperature, and its wear resistance is average.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Carry out surface machining treatment on the crystallization roller or crystallizer to remove the surface oxide layer and defect parts, and the surface roughness is about 3.2;

[0032] 2. Use acetone to clean the oil and metal slag on the surface of the substrate, and then rinse with water;

[0033] 3. Use a conventional alkaline degreasing solution for electroplating to wipe the surface of the substrate, the temperature of the solution is about 50°C, and then rinse with water;

[0034] 4. Electrodegreasing the crystallization roller or crystallizer, the crystallization roller or crystallizer is immersed in the degreasing liquid, the temperature of the degreasing liquid is about 70°C, and the current density is 5.0A / dm 2 , the treatment time is 3min, then hang out and rinse with clean water;

[0035] 5. Use conventional acid etching solution for electroplating to activate the surface of the crystallization roller or crystallizer, the etching time is 1min, and then r...

Embodiment 2

[0044] The steps are the same as in Example 1, except that a pre-nickel plating step is added after step 6. The pre-nickel plating adopts the conventional nickel chloride solution pre-nickel plating process.

[0045] The thickness of the coating obtained by the above process is uniform and dense, and the bonding strength with the substrate is particularly good, and its wear resistance and cold and heat fatigue resistance are excellent.

Embodiment 3

[0047] The steps are the same as in Example 1, except that in step 7, the Co-Ni coating with a composition gradient structure is prepared by continuously changing the current density, and the current density is changed from 100mA / cm 2 down to 10mA / cm 2 , then a gradient Co-Ni coating with a gradually increasing Co content from the inside to the outside is obtained.

[0048] The thickness of the coating obtained by the above process is uniform and dense, and has good bonding strength with the substrate, and its wear resistance and cold and heat fatigue resistance are excellent.

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Abstract

The invention discloses a surface repairing method for a thin-strip continuous casting crystallizing roller or a casting blank continuous casting crystallizer, comprising the following steps of: firstly, pre-processing the surface of the crystallizing roller or the crystallizer properly, then plating monolayer nickel base alloy on the surface of the crystallizing roller or the crystallizer, ending plating when the clad layer meets the requirement on size of the product and machining the crystallizing roller or the crystallizer. The nickel base alloy can be replaced by a nickel base composite clad layer which is formed by diffusing more than one micron-scale or nano-scale solid particles or fiber evenly in a substrate metal by taking pure nickel or the nickel base alloy as the substrate metal; the clad layer is even or of gradient; the clad layer further can be a multi-layer clad layer covered with the nickel base alloy or the nickel base composite clad layer again thereon by using pure nickel as a bottom clad layer. The method has the advantages that the clad layer of the crystallizing roller or the crystallizer is even and compact, has low inner stress, and high bonding strength with the matrix, thereby prolonging service life, reducing the manufacturing cost of continuous casting of the thin strip and casting blank and improving production efficiency and quality of product.

Description

technical field [0001] The invention relates to a method for repairing the surface of steelmaking and continuous casting equipment, in particular to a method for repairing the surface of a strip continuous casting crystal roll or a slab continuous casting crystallizer. Background technique [0002] Strip continuous casting technology can be divided into belt type, roll type, roll belt type, etc. due to the different ways of forming materials. Among them, the twin-roll thin strip continuous casting technology has the most development prospects. The principle of the process is to inject molten metal between a pair of counter-rotating crystallization rollers that are internally cooled by water, so that the molten metal solidifies between the two rollers to form a thin strip. Slab continuous casting is a continuous casting technology in which molten metal is solidified in a quadrilateral mold or copper tube mold composed of copper plates to form a slab. In the continuous castin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/00C25D3/56B23P6/00
Inventor 侯峰岩谭兴海黄丽房鸣李朝雄
Owner SHANGHAI BAOSTEEL EQUIP MAINTENANCE CO LTD
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