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Laser surface alloying treatment process for heating furnace hearth roll collar

A technology of surface alloying and treatment process, applied in the direction of metal material coating process, coating, etc., can solve problems such as instability, and achieve the effect of improving service life, improving operation efficiency, and good anti-nodule ability.

Inactive Publication Date: 2017-01-18
WUHAN DIANJIN LASER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are also attempts to spray oxide ceramics on the surface of the hearth roller, such as the zirconia-yttria system and the alumina-chromia system. These ceramic coatings have a strong anti-nodulation effect at high temperatures, but at high temperatures Instable, even chemical reaction with the elements precipitated on the surface of the steel plate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A laser surface alloying treatment process for the hearth roll ring of a heating furnace, comprising the following process steps:

[0034] (1) Use a cleaning agent to degrease and derust the ring surface of the bottom roller of the heating furnace at room temperature, and clean it with alcohol; use the coloring flaw detection method to inspect the processing part of the eye plate, and it is required that the processing part has no cracks, pores, and inclusions and other defects;

[0035] (2) Selection of alloy powder and powder feeding method: select the self-developed high-temperature-resistant chromium-nickel-carbon alloy powder, and its composition by weight percentage is: Cr: 71%, Ni: 24%, C: 5%; use the same Shaft powder feeding method;

[0036] (3) Selection of scanning method: select Φ3mm narrow-band spot to scan the substrate;

[0037] (4) Laser alloying treatment of wear-resistant surface: open 5000 type CO 2 Laser, the working platform is SIMENS CNC laser p...

Embodiment 2

[0045] A laser surface alloying treatment process for the hearth roll ring of a heating furnace, comprising the following process steps:

[0046] (1) Use a cleaning agent to degrease and derust the ring surface of the bottom roller of the heating furnace at room temperature, and clean it with alcohol; use the coloring flaw detection method to inspect the processing part of the eye plate, and it is required that the processing part has no cracks, pores, and inclusions and other defects;

[0047] (2) Selection of alloy powder and powder feeding method: select the self-developed high-temperature-resistant chromium-nickel-carbon alloy powder, and its composition by weight percentage is: Cr: 71%, Ni: 24%, C: 5%; Shaft powder feeding method;

[0048] (3) Selection of scanning method: select 10×1mm broadband spot to scan the substrate;

[0049] (4) Laser alloying treatment of wear-resistant surface: open 5000 type CO 2 Laser, the working platform is SIMENS CNC laser processing mac...

Embodiment 3

[0057] A laser surface alloying treatment process for the hearth roll ring of a heating furnace, comprising the following process steps:

[0058] (1) Use a cleaning agent to degrease and derust the ring surface of the bottom roller of the heating furnace at room temperature, and clean it with alcohol; use the coloring flaw detection method to inspect the processing part of the eye plate, and it is required that the processing part has no cracks, pores, and inclusions and other defects;

[0059] (2) Selection of alloy powder and powder feeding method: select the self-developed high-temperature-resistant chromium-nickel-carbon alloy powder, and its composition by weight percentage is: Cr: 65%, Ni: 28%, C: 7%; Shaft powder feeding method;

[0060] (3) Selection of scanning method: select Φ3mm narrow-band spot to scan the substrate;

[0061] (4) Laser alloying treatment of wear-resistant surface: open 5000 type CO 2 Laser, the working platform is SIMENS CNC laser processing mac...

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Abstract

The invention relates to a laser surface alloying treatment process for a heating furnace hearth roll collar. The process includes the steps of: adopting chromium nickel carbon alloy powder comprising the following components by weight percentage: 65%-80% of Cr, 17%-28% of Ni, and 3%-7% of C; selecting phi 3mm narrowband light spot or 10*1mm broadband light spot to scan the matrix; starting a CO2 laser, using a CNC laser processing machine as the work platform; employing a coaxial or paraxial powder feeding device to send the alloy powder automatically into a laser molten pool so as to form a uniform and compact alloying coating on the roll collar surface with a thickness of 0.3-0.5mm; and performing crack and flaw detection and judging whether crack is produced. The process provided by the invention reinforces the hearth roll collar surface, improves the service life of the roll collar, basically solves the problem of nodulation on the roll collar surface, saves the roll changing time and maintenance time, improves the heating furnace work efficiency, and reduces the production cost.

Description

technical field [0001] The invention relates to the field of surface strengthening technology for the bottom roller ring of a heating furnace, in particular to a laser surface alloying treatment process for the bottom roller ring of a heating furnace. Background technique [0002] The hearth roller is a key component in the conveying process of various heat treatment parts in the metallurgical industry. It is widely used in various heat treatment furnaces, including continuous annealing furnaces, heating furnaces, heat treatment normalization furnaces, etc. The hearth roller of the heating furnace plays the role of conveying the billet, and in order to ensure that the billet does not have quality problems in the subsequent rolling process, it is very important to prevent the formation of nodules on the surface of the steel rod when the steel rod is in contact with the steel plate at high temperature. Heating furnace hearth roll rings are now commonly made of Co50 alloy, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C27/06
Inventor 陶兴启黄旭东董容刚
Owner WUHAN DIANJIN LASER TECH
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