Corrosion-resistance nickel-based alloy powder for use in plasma spray welding

A technology of nickel-based alloy and alloy powder, which is applied in the field of anti-corrosion nickel-based alloy powder for ion spray welding, and can solve problems such as poor anti-corrosion effect

Inactive Publication Date: 2015-03-04
SHANGHAI FINEWAY ENERGY ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problem that the existing anti-corrosion nickel-based alloy powder spray welding layer has poor anti-corrosion effect when facing the strong corrosion flue gas in the boiler

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The invention provides an anticorrosion material used for flue gas corrosion of the membrane water wall of a thermal power plant boiler.

[0016] Step 1 alloy melting

[0017] In terms of mass percentage, the chemical composition of the nickel-based alloy powder is selected as: Cr: 22%, Mo: 13%, Cu: 1.6%, Si: 2.0%, Fe: 3%, Nb: 3%, Al: ≤ 1%, C: ≤ 0.01%, O: ≤ 0.1%, Ni is the balance. Melting in a vacuum induction furnace or manual electric arc furnace or consumable vacuum electric arc furnace or non-electric arc furnace. Use argon or nitrogen protection during melting.

[0018] Step 2 Milling

[0019] The alloy in molten state is atomized by water atomization or gas atomization. Adjust the flow and pressure of atomized water or atomized gas during atomization to control the particle size and uniformity of the powder;

[0020] Step 3 Powder particle size screening

[0021] Screen the powder with a particle size ranging from 40 to 500 meshes from the prepared powder, ...

Embodiment 2

[0025] The invention provides an anticorrosion material used for flue gas corrosion of a boiler superheater in a thermal power plant.

[0026] Step 1 alloy melting

[0027] In terms of mass percentage, the chemical composition of the nickel-based alloy powder is selected as: Cr: 22%, Mo: 13%, Cu: 1.6%, Si: 2.0%, Fe: 3%, Nb: 3%, Al: ≤ 1%, C: ≤ 0.01%, O: ≤ 0.1%, Ni is the balance. Melting in a vacuum induction furnace or manual electric arc furnace or consumable vacuum electric arc furnace or non-electric arc furnace. Use argon or nitrogen protection during melting.

[0028] Step 2 Milling

[0029] The alloy in molten state is atomized by water atomization or gas atomization. Adjust the flow and pressure of atomized water or atomized gas during atomization to control the particle size and uniformity of the powder;

[0030] Step 3 Powder particle size screening

[0031] Screen the powder with a particle size ranging from 40 to 500 meshes from the prepared powder for spray w...

Embodiment 3

[0035] The invention provides an anticorrosion material used for flue gas corrosion of boiler four-pipe accessories (wearing parts, flow blocking parts, supporting parts, etc.) of a thermal power plant.

[0036] Step 1 alloy melting

[0037] In terms of mass percentage, the chemical composition of the nickel-based alloy powder is selected as: Cr: 22%, Mo: 13%, Cu: 1.6%, Si: 2.0%, Fe: 3%, Nb: 3%, Al: ≤ 1%, C: ≤ 0.01%, O: ≤ 0.1%, Ni is the balance. Melting in a vacuum induction furnace or manual electric arc furnace or consumable vacuum electric arc furnace or non-electric arc furnace. Use argon or nitrogen protection during melting.

[0038] Step 2 Milling

[0039] The alloy in molten state is atomized by water atomization or gas atomization. Adjust the flow and pressure of atomized water or atomized gas during atomization to control the particle size and uniformity of the powder;

[0040] Step 3 Powder particle size screening

[0041] Screen the powder with a particle si...

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PUM

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Abstract

The invention relates to corrosion-resistance nickel-based alloy powder for use in plasma spray welding. The corrosion-resistance nickel-based alloy powder comprises the following components in percentage by weight: 20-25 percent of Cr, 10-18 percent of Mo, less than or equal to 3 percent of Cu, less than or equal to 4 percent of Fe, less than or equal to 4 percent of Nb, less than or equal to 1 percent of Al, less than or equal to 3 percent of Si, less than or equal to 0.01 percent of C, less than or equal to 0.1 percent of O and the balance of Ni. The granularity of the alloy powder is 40-500 meshes. The nickel-based alloy powder has the advantages of suitability for reductive corrosive media, suitability for oxidative corrosive media, excellent corrosion prevention generality and applicability to flue gas corrosion protection during burning of coal with high sulfur content, high chlorine content and high alkali content. During plasma spray welding of equipment such as a boiler, a spray welding layer is controllable in thickness, so that the weight of the boiler equipment can be increased controllably; the hardness of the spray welding layer is smaller than the hardness of an original substrate material, so that the machining and manufacturing of equipment are not influenced; when the powder is spray-welded on the heating surface of the boiler, the linear expansion coefficient of the spray welding layer is approximate to that of the original substrate material without influencing the thermal expansion and cold contraction of the heating surface or increasing the internal stress of heating surface equipment.

Description

[technical field] [0001] The invention relates to an alloy powder for spray welding, in particular to an anti-corrosion nickel-based alloy powder for plasma spray welding. [Background technique] [0002] Power plant boiler economizer, water wall, superheater, reheater and other heating surfaces are caused by high-temperature flue gas corrosion on the flue gas side, which leads to pipe bursting, which is one of the main reasons for shutdown accidents, especially when burning high-sulfur, high-chlorine , High-alkali fuel, the flue gas will strongly intensify the corrosion of the heating surface, thereby greatly reducing the service life of the boiler. For example, in the Xinjiang region in the west of China, there are a large number of cheap coals with high sulfur, alkali, and chlorine content. Due to the strong corrosiveness of the flue gas produced when burning this coal, the service life of conventional boiler equipment is only a few months. It has practical industrial sig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K10/02
CPCB23K10/02B23K35/304C22C1/02C22C19/055
Inventor 杨少民
Owner SHANGHAI FINEWAY ENERGY ENG
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