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Process for performing laser cladding on alloy coating with characteristics of wear resistance and heat resistance by hot rolling of seamless steel pipe

A seamless steel pipe, laser cladding technology, applied in the heat-resistant alloy coating process, laser cladding technology to repair metallurgical equipment components, laser cladding wear-resistant field of hot-rolled seamless steel pipe conveyor roller, can solve the problem of conveyor roller stack Welding repair failure, large dilution rate, overheating structure and other problems

Active Publication Date: 2014-12-31
BEIJING DALU TIANRUI LASER ENG TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The deterioration of the surface condition of the hot-rolled seamless steel pipe delivery roller due to wear affects the surface quality of the steel pipe off the production line
[0003] The main methods for surface modification of hot-rolled seamless steel pipe conveyor rolls are traditional surfacing and spray welding. The surfacing layer obtained by traditional surfacing and spray welding has a coarse structure, a large heat-affected zone, and a large dilution rate. Coarse grains and overheated structures are prone to occur, the bonding strength is not high, and it is prone to shedding and peeling
The poor wear resistance of the overlapping area of ​​the surfacing belt leads to preferential wear grooves, which is often the main reason for the failure of the surfacing repair of the conveyor roller

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The laser cladding wear-resistant and heat-resistant alloy coating process method for hot-rolled seamless steel pipe conveying roller table includes the following process.

[0037] (1) Surface pretreatment of hot-rolled seamless steel pipe conveyor rolls.

[0038] Degrease and derust the processed surface of the conveying roller at room temperature, and clean it with alcohol.

[0039] The processed parts of the workpiece are inspected by the coloring flaw detection method, and the processed parts are required to be free of cracks, pores, inclusions and other defects.

[0040] (2) Selection and preparation of alloy powder.

[0041] The binder phase alloy powder is selected from superhard high-speed steel powder alloy powder with excellent high-temperature red hardness and good metallurgical compatibility with the matrix. The chemical composition of high-speed steel powder is as follows: C: ≤0.03%, Cr: 0-1.0%, Ni: 5-7%, Mo: 6-7.5%, Si: ≤0.1%, W: 12-15% , Al: 0.05-0.15...

Embodiment 2

[0062] The laser cladding wear-resistant and heat-resistant alloy coating process method for hot-rolled seamless steel pipe conveying roller table includes the following process.

[0063] (1) Surface pretreatment of hot-rolled seamless steel pipe conveyor rolls.

[0064] Degrease and derust the processed surface of the conveying roller at room temperature, and clean it with alcohol.

[0065] The processed parts of the workpiece are inspected by the coloring flaw detection method, and the processed parts are required to be free of cracks, pores, inclusions and other defects.

[0066] (2) Selection and preparation of alloy powder.

[0067] The binder phase alloy powder is selected from superhard high-speed steel powder alloy powder with excellent high-temperature red hardness and good metallurgical compatibility with the matrix. The chemical composition of high-speed steel powder is as follows: C: ≤0.03%, Cr: 0-1.0%, Ni: 5-7%, Mo: 6-7.5%, Si: ≤0.1%, W: 12-15% , Al: 0.05-0.15%...

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Abstract

The invention relates to a process for performing laser cladding on an alloy coating with characteristics of wear resistance and heat resistance by hot rolling of a seamless steel pipe, which is characterized by comprising the following steps: removing oil and rust on the surface of a transport roller under room temperature, washing by alcohol; preparing the alloy powder, mixing superhard high speed steel powder alloy powder and carbide powder according to proportion of 4:1; selecting a 3.5*1mm focusing mirror, adjusting defocusing amount to make a focused laser spot as an elliptical shape, employing a synchronization powder feeding apparatus for automatically seeding the alloy powder into a laser molten pool, focusing laser beam with high power, feeding by an automatic powder feeding head along the axial direction of the transport roller of the seamless steel pipe, setting rotating speed for rotation, forming an uniform and compact laser cladding layer on the surface of the transport roller; performing hot rolling on the transport roller of the seamless steel pipe, and then performing heat treatment; and grinding and processing a laser cladding hard alloy coating to the required size. The cladding layer hardness of the formed uniform and compact wear-resistant anti-corrosion cladding layer can reach more than HRC 65, and the service life is increased by more than 8 times.

Description

technical field [0001] The invention relates to a method for repairing metallurgical equipment components using laser cladding technology, in particular to a laser cladding wear-resistant and heat-resistant alloy coating process method for hot-rolled seamless steel pipe delivery rollers, which belongs to the technical field of laser cladding . Background technique [0002] The hot-rolled seamless steel pipe conveyor roller is one of the supporting equipment components of the hot-rolled seamless steel pipe production line. Its service life and surface condition have a crucial impact on the quality and production capacity of the seamless steel pipe. The hot-rolled seamless steel pipe conveyor roller is water-cooled during the working process, resulting in alternating hot and cold surfaces, which is prone to fatigue and cracks; at the same time, it is affected by the pressure and high temperature of the steel pipe, and the surface wears due to friction. The wear failure modes ...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C38/14C22C38/52C22C38/54
Inventor 赵越陈海涛张威
Owner BEIJING DALU TIANRUI LASER ENG TECHCO
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