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Continuous-casting cast rod for overlay welding of high-temperature and high-pressure valve and welding technology thereof

A high temperature and high pressure, welding process technology, applied in the field of remanufacturing, can solve the problems of corrosion, waste of resources, and high maintenance costs, and achieve the effects of avoiding waste, prolonging service life, and high hardness of the matrix

Inactive Publication Date: 2017-12-01
安徽鼎恒再制造产业技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After a period of use, high temperature and high pressure valves will be corroded and worn to varying degrees, and need to be replaced in time. There is a problem of high maintenance costs, and the worn high temperature and high pressure valves have not been effectively recycled, resulting in waste of resources

Method used

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  • Continuous-casting cast rod for overlay welding of high-temperature and high-pressure valve and welding technology thereof
  • Continuous-casting cast rod for overlay welding of high-temperature and high-pressure valve and welding technology thereof
  • Continuous-casting cast rod for overlay welding of high-temperature and high-pressure valve and welding technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A continuous casting rod for surfacing welding of high-temperature and high-pressure valves, comprising the following components in mass percentage:

[0019]

[0020]

[0021] The vanadium carbide powder includes the following components in mass percentage: 17% of total carbon, 0.1% of free carbon, 0.5% of Fe, 0.2% of Si, and the balance of VC.

[0022] The metal manganese nitride powder includes the following components in mass percentage: N is 6.5%, C is 0.5%, Si is 1%, P is 0.1%, S is 0.05%, and Mn is the balance.

[0023] A welding process of continuous casting rods for surfacing welding of high-temperature and high-pressure valves, the welding process is: adopting an oxygen-acetylene carbonization flame welding method (manual or automatic) for surfacing welding.

[0024] Preheating treatment is carried out before surfacing, the preheating temperature is 300 ℃, and the temperature between surfacing layers is 250 ℃.

[0025] Stress relief heat treatment should...

Embodiment 2

[0027] A continuous casting rod for surfacing welding of high-temperature and high-pressure valves, comprising the following components in mass percentage:

[0028]

[0029] The vanadium carbide powder includes the following components in mass percentage: 19% of total carbon, 0.05% of free carbon, 0.1% of Fe, 0.5% of Si, and the balance of VC.

[0030] The metal manganese nitride powder includes the following components in mass percentage: N is 9.0%, C is 0.1%, Si is 0.5%, P is 0.2%, S is 0.1%, and Mn is the balance.

[0031] A welding process of continuous casting rods for surfacing welding of high-temperature and high-pressure valves, the welding process is: adopting an oxygen-acetylene carbonization flame welding method (manual or automatic) for surfacing welding.

[0032] Preheating treatment is carried out before surfacing, the preheating temperature is 250 ℃, and the temperature between surfacing layers is 250 ℃.

[0033] Stress relief heat treatment should be carrie...

Embodiment 3

[0035] A continuous casting rod for surfacing welding of high-temperature and high-pressure valves, comprising the following components in mass percentage:

[0036]

[0037] The vanadium carbide powder includes the following components in mass percentage: 18% of total carbon, 0.1% of free carbon, 0.5% of Fe, 0.5% of Si, and the balance of VC.

[0038] The metal manganese nitride powder includes the following components in mass percentage: N is 7.3%, C is 0.4%, Si is 0.8%, P is 0.15%, S is 0.1%, and Mn is the balance.

[0039] A welding process of continuous casting rods for surfacing welding of high-temperature and high-pressure valves, the welding process is: adopting tungsten argon arc welding (manual or automatic) for surfacing welding.

[0040] Preheating treatment is carried out before surfacing, the preheating temperature is 350°C, and the interlayer temperature of surfacing is 250°C.

[0041] Stress relief heat treatment should be carried out immediately after the w...

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Abstract

The invention relates to a continuous-casting cast rod for overlay welding of a high-temperature and high-pressure valve and a welding technology thereof. The continuous-casting cast rod is prepared from the following components including, by mass percent, 0.5% to 0.7% of active carbon powder, 17% to 28% of vanadium carbide powder, 3%-4% of high-purity tungsten powder, 5%-7% of calcium-silicon powder, 3%-5% of metal manganese nitride powder, 1%-2% of nickel-chromium alloy powder and the balance cobalt-chromium alloy powder. The technology provided by the invention is reasonable in step arrangement; size repairing of the high-temperature and high-pressure valve is realized by adopting specific components and a specific proportion; and meanwhile, properties of the high-temperature and high-pressure valve are greatly improved, so that the service life of the high-temperature and high-pressure valve is easily prolonged and waste of resources is avoided.

Description

technical field [0001] The invention relates to the technical field of remanufacturing, in particular to a continuous casting rod for surfacing welding of high-temperature and high-pressure valves and its welding process. Background technique [0002] The valve is a control component in the fluid delivery system, which has functions such as cut-off, adjustment, flow diversion, reverse flow prevention, pressure stabilization, flow diversion or overflow pressure relief. Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. Valves are also divided into cast iron valves, cast steel valves, stainless steel valves, chrome-molybdenum steel valves, chrome-molybdenum-vanadium steel valves, duplex steel valves, plastic valves, non-standard custom-made valves, etc. according to the material. [0003] For special-purpose valves, such as high-temperature and high-pressure valves...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/24B23K9/04B23K9/167B23K5/18
CPCB23K5/18B23K9/04B23K9/167B23K35/24
Inventor 程敬卿薛卫昌周乾坤
Owner 安徽鼎恒再制造产业技术研究院有限公司
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