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High-temperature sulfur corrosion resisting cored wire used for spraying

A technology of powder core wire and sulfur corrosion, which is applied in the field of high temperature sulfur corrosion resistant spray powder core wire, which can solve the problems of poor resistance to high temperature sulfur corrosion and achieve high sulfur corrosion resistance

Inactive Publication Date: 2014-04-16
BEIJING SURYEE SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the past, electric arc spraying was used to repair the four tubes of the boiler, most of which were stainless steel spraying materials, but the resistance of these materials to high temperature sulfur corrosion was not very good

Method used

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  • High-temperature sulfur corrosion resisting cored wire used for spraying
  • High-temperature sulfur corrosion resisting cored wire used for spraying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] All welding wires in the examples are produced by the existing mature flux-cored wire forming machine:

[0014] 1. Use 10×0.3 (width 10mm, thickness 0.3mm) 304 stainless steel strip. Roll it into a U shape first. Take 30 grams of metal chromium powder, 15 grams of nickel powder, 20 grams of ferroboron, 10 grams of ferrosilicon, 10 grams of aluminum powder, 10 grams of copper powder, and 5 grams of rare earth. (The particle size of the powder taken is that it can pass through a 40-mesh sieve). The various powders taken are put into a powder mixer and mixed for 10 minutes, and then the mixed powder is added into a U-shaped H08A cold-rolled steel strip groove, and the filling rate is 20%. Close the U-shaped groove so that the powder is wrapped in it. Then make it pass through drawing dies with diameters of 3.4mm, 3.15mm, 2.95mm, 2.8mm, 2.6mm, 2.4mm, 2.0mm, 1.8mm, and 1.6mm, draw and reduce the diameter one by one, and finally make the diameter up to 1.6mm. Then sprayi...

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Abstract

The invention relates to a high-temperature sulfur corrosion resisting cored wire used for spraying. The invention belongs to the welding field in material processing engineering. The cored wire is mainly used in spraying on power plant boiler pipeline parts bearing high-temperature sulfur corrosion. The cored wire is characterized in that: a flux core comprises components of, by weight: 30-70% of metal chromium, 6-15% of nickel, 10-20% of boron iron, 5-10% of ferrosilicon, 5-10% of aluminum, 2-10% of copper, and 2-5% of rare earth. The invention aims at solving the defects of traditional corrosion-resisting spraying materials, and providing a hot-spraying cored wire which can effectively resist high-temperature sulfur-corrosion.

Description

technical field [0001] It belongs to the field of spraying in material processing, and is mainly used in the spraying of boiler pipes in power plants that withstand high-temperature sulfur corrosion. Background technique [0002] my country is a country dominated by thermal power generation. In thermal power plants, the corrosion and wear of water-cooled wall tubes, superheater tubes, reheater tubes, and economizer tubes (referred to as boiler four tubes) of high-temperature and high-pressure boilers is a long-term problem. Economic and technical problems plaguing power plants. The fuel contains Na, K, S, etc., and the Na formed after combustion 2 O and K 2 O condenses on the pipe wall, and SO in the flue gas 3 Combined to form sulfate. Under the action of high temperature, low-melting-point composite sulfates are formed on the surface of the tube wall, causing thermal corrosion; the fly ash formed by combustion scours the surface of the furnace tube under the action of a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/08
Inventor 胡为峰蒋旻葛爽
Owner BEIJING SURYEE SCI & TECH