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A kind of metal-ceramic coating continuous casting crystallizer copper tube and preparation method thereof

A cermet coating and continuous casting mold technology, which is applied in metal material coating process, coating, fusion spraying and other directions, can solve the problem of inability to prepare cermet coating with HVOF spray gun

Active Publication Date: 2020-07-07
东创博实(沈阳)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the inner diameter of the copper tube of the continuous casting crystallizer is basically impossible to use the HVOF spray gun to prepare the cermet coating

Method used

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  • A kind of metal-ceramic coating continuous casting crystallizer copper tube and preparation method thereof
  • A kind of metal-ceramic coating continuous casting crystallizer copper tube and preparation method thereof
  • A kind of metal-ceramic coating continuous casting crystallizer copper tube and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A preparation method of R6-160*160*900 metal ceramic coating continuous casting mold copper tube adopts HVAF process, and the process steps are as follows:

[0040] step 1:

[0041] (1) Straightening the surface of the copper tube: Use a press to straighten the copper tube. The radius of the curved surface on one side is 6000mm±1mm, and the flatness on the straight side is less than 1mm to obtain the straightened copper tube.

[0042] (2) Degreasing the surface of the copper tube: Use industrial alcohol to deoil the surface of the straightened copper tube, and use acetone to purify the surface to be sprayed before spraying.

[0043] Step 2: Sandblasting and preheating the surface of the copper pipe

[0044] Set the robot program, use the HVAF inner hole spray gun, start the HVAF spraying system, ignite and send the sandblasting powder. The thermal temperature is 90-120°C. The surface roughness Ra after sandblasting is 2.5 to 4 μm. The relevant parameters of sandblas...

application example 1

[0062] In February 2018, a steel mill used the cermet coating continuous casting mold copper tube prepared in Example 1 of the present invention. After use, it was found that the cermet coating continuous casting mold copper tube of the present invention has the following advantages:

[0063] 1. Over 36,000 tons of steel, the maximum wear amount is 0.4mm, which is much smaller than the wear amount of 2-3mm when the electroplated copper tube passes over 7,500 tons of steel;

[0064] 2. Because there is almost no wear and tear, the taper of the narrow copper pipe is well maintained;

[0065] 3. Reduce the workload of disassembly and repair;

[0066] 4. Extend the life of copper tube.

application example 2

[0068] In May 2018, a steel mill used the cermet coating continuous casting mold copper tube prepared in Example 1 of the present invention. After use, it was found that the cermet coating continuous casting mold copper tube of the present invention has the following advantages:

[0069] 1. The average amount of steel passing is increased by 4.5 times;

[0070] 2. A single copper tube is used twice on average, and its service life reaches 80,000 tons, an increase of 11 times;

[0071] 3. The shape of the corners of the billet is stable, which greatly reduces cracks;

[0072] 4. The heat flow is stable and the rotten edges are reduced.

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Abstract

The invention discloses a metal ceramic coating continuous casting crystallizer copper pipe and a preparing method thereof, and belongs to the technical field of continuous casting crystallizer surface treatment. The method comprises the steps that the copper pipe is straightened and subjected to oil removal; an HVAF inner hole spray gun is used, an HVAF spraying system with a combustion improverbeing air is started, sand blasting and preheating are conducted, the spraying technology procedure is started, ignition is conducted, spraying material WC-10Co-4Cr powder is conveyed, a metal ceramiclayer is sprayed to the preheated copper pipe, and the copper pipe with a metal ceramic coating is obtained; and the three-layer hole sealing technology is adopted for conducting copper pipe surfacehole sealing, then, copper pipe surface layer curing is conducted, the hardness of the metal ceramic coating ranges from HV1200 to HV1350, the porosity is smaller than or equal to 1%, and the bondingforce of the metal ceramic coating and the continuous casting crystallizer copper pipe is larger than or equal to 70 MPa. The prepared metal ceramic coating continuous casting crystallizer copper pipeis high in coating hardness, low in brittleness and porosity and high in bonding force.

Description

technical field [0001] The invention relates to the technical field of continuous casting mold surface treatment, in particular to a metal ceramic coating continuous casting mold copper tube and a preparation method thereof. Background technique [0002] Mold copper tube is the core component of continuous casting equipment in steelmaking plants. The molten steel is cooled in the mold, preliminarily cooled and solidified, and uniformly forms a shell with a certain thickness. The solidification process is carried out under the continuous and relative motion of the shell and the copper tube wall of the mold under the action of gravity and external vibration device. For this reason, the wear resistance of the inner surface of the copper tube of the continuous casting mold is better to improve the service life. In the method of improving the wear resistance of the inner surface of the copper tube of the crystallizer, the electroplating wear-resistant layer is mainly used at pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/129C23C4/06C23C4/18B22D11/059
CPCB22D11/059C23C4/06C23C4/129C23C4/18
Inventor 刚占库涂赣峰姚顺宇李宝雄夏广林庄绪成
Owner 东创博实(沈阳)科技有限公司
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