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Tubular hard surface overlaying material

A technology of surfacing material and hard surface, applied in welding/cutting medium/material, welding medium, welding equipment, etc., can solve the problem of mismatch of strength, hardness and toughness, achieve good wear resistance and improve high temperature burning resistance. Corrosion resistance, the effect of improving wear resistance

Active Publication Date: 2009-10-14
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a tubular hard surface surfacing material, which can effectively avoid the melting loss of the hard surfacing material particles in the high temperature surfacing process, and satisfactorily solve the strength and hardness of the base metal. The problem of mismatch between toughness and toughness, significantly improving the wear resistance of the surfacing layer

Method used

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  • Tubular hard surface overlaying material
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Experimental program
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Effect test

Embodiment 1

[0029] Tubular electrode filler powder is composed of 60% surface-coated tungsten carbide particles with a particle size of 40-100 mesh; 35% single crystal tungsten carbide particles with a particle size of 40-200 mesh; 2.8% 200-mesh SiMn powder; 0.2% 200 mesh phenolic resin powder; 2% 200 mesh rare earth alloy powder. The tube skin is low carbon steel SPCD-SD, the tube diameter is 4mm, and the tube skin thickness is 0.4mm. The filler powder accounts for 60% of the weight of the electrode. Metallographic photos of surface-treated cast tungsten carbide particles are shown in figure 1 , the outside of the particle is a layer of 10-20μm thick coating composed of nanoscale cast tungsten carbide particles, and the core is a needle-shaped cast tungsten carbide eutectic structure. After surfacing, the metallographic phase of the surfacing layer is as follows: figure 2 , it can be seen from the metallographic diagram that the two kinds of hard particles have a clear interface with...

Embodiment 2

[0031] The filler powder for the tubular electrode consists of: 75% single crystal tungsten carbide particles with a particle size of 40-80 mesh; 22.3% surface coated tungsten carbide particles with a particle size of 80-100 mesh; 2% 200-mesh SiMn powder; 0.6% 200 mesh phenolic resin powder; 0.1% 200 mesh rare earth alloy powder. The tube skin is low carbon steel SPCD-SD, the tube diameter is 4mm, and the tube skin thickness is 0.2mm. The filler powder accounts for 80% of the weight of the electrode. The microhardness of cast tungsten carbide particles in the surfacing layer of this embodiment is: HV 0.1 2971, the microhardness of single crystal tungsten carbide particles is: HV 0.1 In 1975, the microhardness of the base metal was: HV 0.05 816, metal wet sand wear test shows that the wear resistance of this embodiment is 20-80% higher than that of similar electrodes.

Embodiment 3

[0033] The tubular electrode filler powder is composed of 73% single crystal tungsten carbide particles with a particle size of 40-80 mesh; 20% surface-coated tungsten carbide particles with a particle size of 80-100 mesh; 6% 200-mesh SiMn powder; 0.4% 200 mesh phenolic resin powder; 0.6% 200 mesh rare earth alloy powder. The tube skin is low carbon steel SPCD-SD, the tube diameter is 4mm, and the tube skin thickness is 0.3mm. The filler powder accounts for 70% of the weight of the electrode. The microhardness of cast tungsten carbide particles in the surfacing layer of this embodiment is: HV 0.1 2975, the microhardness of single crystal tungsten carbide particles is: HV 0.1 In 1978, the microhardness of the base metal was: HV 0.05820, metal wet sand wear test shows that the wear resistance of this embodiment is 50-100% higher than that of similar electrodes.

[0034] In summary, the present invention uses thermally stable hard particles to significantly improve the wear r...

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Abstract

The invention provides a tubular hardfacing surfacing material, including tube skin and filling powder, its composition: 20% to 40% of steel, 60% to 80% of filling powder; the component of filling powder: single crystal tungsten carbide particles 35-75%, surface-treated thermally stable cast tungsten carbide particles 20-60%, SiMn alloy powder 2-6%, resin powder 0.2-0.6%, rare earth metal 0.1-2%; the particle size of single crystal tungsten carbide particles 40-200 mesh; surface-treated cast tungsten carbide particles have a particle size of 40-100 mesh, and the outside of the particles is a layer of 10-20 μm thick coating layer composed of nano-sized tungsten carbide particles, and the core is needle-shaped cast carbide particles. Tungsten eutectic structure. The invention adopts thermally stable hard particles to significantly improve the wear resistance and weldability of the surfacing layer. In addition, adding a small amount of rare earth elements can simultaneously improve the hardness and toughness of the base metal, and significantly improve the impact resistance of the surfacing layer. And the ability to fix hard particles, thus prolonging the service life of the surfacing layer.

Description

technical field [0001] The invention relates to a surfacing material, in particular to a tubular hard surface surfacing material, which is mainly used for wear-resisting strengthening of the tooth surface of a steel-toothed cone bit, the palm tip and the working surfaces of other engineering tools. Background technique [0002] As we all know, in the process of oil drilling, the working environment is very harsh, and the mechanical parts are very worn; due to the special working conditions, the tooth surface of the gear tooth drill bit needs to be surfacing with a layer of wear-resistant materials. Tungsten carbide is one of the materials with the highest hardness and the best wear resistance except diamond used in industry. The traditional process of surfacing welding of the tooth surface of the gear steel tooth bit is to use the tube-packed granular cast tungsten carbide electrode and surfacing with oxy-acetylene flame. Impact and collapse, which is not conducive to impro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/368B23K35/12
Inventor 徐纯芳余立新马自强
Owner SHAREATE TOOLS
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