No-co ferrous alloy powder composition for sealing face of nuclear power valve

A technology of alloy powder and valve sealing, applied in metal material coating process, coating and other directions, can solve the problems of increased maintenance time, threat of maintenance personnel, expensive and other problems, achieve good high temperature wear resistance and prolong service life

Inactive Publication Date: 2010-08-11
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high price of cobalt-based alloys and the lack of cobalt resources in our country, it is an expensive strategic resource. Chinese scientific and technological workers have been looking for substitutes for cobalt-based alloys.
In addition, during the use of the valve with the cobalt-based cladding layer as the sealing surface of the nuclear valve, the Co59 in the wear and corrosion debris of the cobalt-based alloy will be excited by neutron irradiation to form a Co60 isotope. Co60 is a strong radiation with a very long half-life. source, which will increase the maintenance time and threaten the maintenance personnel during shutdown maintenance, and will also greatly increase the difficulty and cost of nuclear fuel shielding

Method used

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  • No-co ferrous alloy powder composition for sealing face of nuclear power valve
  • No-co ferrous alloy powder composition for sealing face of nuclear power valve
  • No-co ferrous alloy powder composition for sealing face of nuclear power valve

Examples

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Effect test

Embodiment 1

[0052] Use GS-TFL-10KW type high power cross-flow CO 2 For a 10,000-watt-class laser, a 1Cr18Ni9Ti stainless steel substrate with a size of 50mm×40mm×10mm is selected, and the substrate sample is installed on the workbench of a 6-axis 5-linkage CNC processing machine for cladding processing. The mode is selected as multi-mode, and the iron-based alloy is used The powder feeding method adopts the annular hollow light vertical powder feeding method, and uses the coaxial nozzle for powder feeding inside the light to feed the powder, and simultaneously blows inert gas protection to the molten pool.

[0053] According to the following steps, a laser cladding process is used to prepare a nuclear power valve sealing surface coating using a cobalt-free iron-based alloy powder composition:

[0054] (1) Mix powder according to the following mass percentage: chromium (Cr) 21%; nickel (Ni) 3.5%; manganese (Mn) 3.0%; silicon (Si) 2.5%; carbon (C) 1.0%; molybdenum (Mo) 1.5%; Tungsten (W) 1...

Embodiment 2

[0067] Use GS-TFL-10KW type high power cross-flow CO 2 For a 10,000-watt laser, a 1Cr18Ni9Ti stainless steel substrate with a size of 60mm×50mm×10mm is selected, and the substrate sample is installed on the workbench of a 6-axis and 5-linkage CNC processing machine for cladding processing. The mode is selected as multi-mode, and the iron substrate is used Alloy powder, inert gas protection is blown to the molten pool.

[0068] According to the following steps, a laser cladding process is used to prepare a nuclear power valve sealing surface coating using a cobalt-free iron-based alloy powder composition:

[0069] (1) Mix powder according to the following mass percentage: chromium (Cr) 21.5%; nickel (Ni) 3.0%; manganese (Mn) 3.5%; silicon (Si) 2.0%; carbon (C) 0.9%; molybdenum (Mo) 2.0%; Tungsten (W) 0.7%; Vanadium (V) 0.3%; Phosphorus (P) 0.02%; Sulfur (S) 0.02%; Yttrium (Y) 0.5%; Base alloy powder composition, the powder particle size reaches 300 mesh, and the powder densit...

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Abstract

The invention belongs to the field of alloy material, relating to no-co ferrous alloy, in particular to no-co ferrous alloy for enhancing material of the sealing face of a nuclear power valve. The no-co ferrous alloy powder composition contains the following ingredients by weight percent: 20.5%-21.5% of Cr, 3.0%-3.5% of Ni, 3.0%-3.5% of Mn, 2.0%-2.5% of Si, 0.9%-1.0% of C, 1.5%-2.0% of Mo, 0.7%-1.2% of W, 0.3%-0.5% of V, P is less than or equal to 0.02%, S is less than or equal to 0.02%, 0.5%-1.0% of Y and the balance of Fe. The no-co ferrous alloy powder composition contains no noble metal of Co, at the same time, since laser cladding technology is adopted to prepare the coating, the microhardness of the cladding layer is 1.6-1.8 times of that the stainless steel matrix. The no-co ferrous alloy powder composition has excellent high-temperature abrasion performance and high-temperature corrosion resistance, so the no-co ferrous alloy powder composition can prolong the service life of the valve.

Description

technical field [0001] The invention belongs to the field of alloy materials, and relates to a cobalt-free iron-based alloy powder combination, in particular to a cobalt-free iron-based alloy used as a strengthening material for nuclear power valve sealing surfaces. Background technique [0002] In the nuclear power industry, valves play a key role and are used in large quantities. At the same time, nuclear power valves are developing towards high parameters, such as large size, high temperature and high pressure resistance, strong corrosion resistance and strong friction, high reliability and long life. The operating conditions of nuclear power valves are quite harsh, and the required safety and reliability are very high. [0003] At present, the valves used in my country's mature second-generation nuclear power plant technology require a comprehensive service life of more than 40 years (the service life of nuclear-grade valves in third-generation pressurized water reactor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C23C24/10
Inventor 魏宏璞石世宏傅戈雁刘双刘秀波何结国徐梅刘嘉
Owner SUZHOU UNIV
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