High-temperature wear-resistant CREE rare earth heat-resistant steel for power station fluidized bed hood and preparation method thereof

A high-temperature wear-resistant, fluidized bed technology, applied in the direction of manufacturing tools, casting molding equipment, metal processing equipment, etc., can solve the problems of low alloy cost, wear, insufficient strength of heat-resistant steel, etc., to achieve reduced high-temperature wear and uniform composition , The effect of Ni content reduction

Pending Publication Date: 2022-03-01
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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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 provide a high-temperature wear-resistant CNRE rare earth heat-resistant steel for power station fluidized bed hood and its preparation method, through C, N co-alloying and V, Nb, RE micro-alloying, high temperature strength and high temperature resistance can be improved Grinding performance, solving the technical problems of insufficient strength and severe wear of traditional high Cr-high Ni heat-resistant steel, and has a lower alloy cost, thereby greatly improving the production efficiency of the fluidized bed and reducing production costs

Method used

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  • High-temperature wear-resistant CREE rare earth heat-resistant steel for power station fluidized bed hood and preparation method thereof
  • High-temperature wear-resistant CREE rare earth heat-resistant steel for power station fluidized bed hood and preparation method thereof
  • High-temperature wear-resistant CREE rare earth heat-resistant steel for power station fluidized bed hood and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0055] In this embodiment, the high-temperature wear-resistant CNRE rare earth heat-resistant steel is used for the wind cap of the fluidized bed of the power station, and the specific components are as follows by weight percentage:

[0056] element Content (mass fraction, wt.%) C+N 0.66 (C0.35, N0.31) Si 2.0 mn 10.8 Cr 23.4 Ni 3.9 Mo 0.8 V 0.07 Nb 0.14 RE 0.024 Fe margin

[0057] In this example, the preparation process of the high-temperature wear-resistant CNRE rare earth heat-resistant steel for the fluidized bed hood of the power station is as follows:

[0058] The molten steel is smelted in an intermediate frequency furnace, and the lining of the intermediate frequency furnace is made of alkaline refractory materials and alkaline ladles. Alloy ingredients are scrap steel, graphite block, metal chromium, ferrochromium nitride, electrolytic manganese, nickel plate, ferrosilicon, ferromolybdenum, fe...

Embodiment 2

[0063] In this embodiment, the high-temperature wear-resistant CNRE rare earth heat-resistant steel is used for the wind cap of the fluidized bed of the power station, and the specific components are as follows by weight percentage:

[0064] element Content (mass fraction, wt.%) C+N 0.88 (C0.43, N0.45) Si 1.8 mn 7.2 Cr 18.4 Ni 1.9 Mo 0.3 V 0.25 Nb 0.09 RE 0.033 Fe margin

[0065] In this example, the preparation process of the high-temperature wear-resistant CNRE rare earth heat-resistant steel for the fluidized bed hood of the power station is as follows:

[0066] The molten steel is smelted in an intermediate frequency furnace, and the lining of the intermediate frequency furnace is made of alkaline refractory materials and alkaline ladles. Alloy ingredients are scrap steel, low-carbon ferrochrome, high-carbon ferrochrome, ferrochrome nitride, electrolytic manganese, nickel plate, ferrosilicon, ferro...

Embodiment 3

[0071] In this embodiment, the high-temperature wear-resistant CNRE rare earth heat-resistant steel is used for the wind cap of the fluidized bed of the power station, and the specific components are as follows by weight percentage:

[0072]

[0073]

[0074] In this example, the preparation process of the high-temperature wear-resistant CNRE rare earth heat-resistant steel for the fluidized bed hood of the power station is as follows:

[0075] The molten steel is smelted in an intermediate frequency furnace, and the lining of the intermediate frequency furnace is made of alkaline refractory materials and alkaline ladles. Alloy ingredients are scrap steel, low-carbon ferrochrome, high-carbon ferrochrome, ferrochrome nitride, electrolytic manganese, nickel plate, ferrosilicon, ferromolybdenum, ferroniobium, ferrovanadium, high-purity rare earth metals, etc. Among them, ferrochromium nitride is crushed to less than 45mm, together with ferrosilicon, ferromolybdenum, low-carbo...

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Abstract

The invention relates to the field of energy power, in particular to high-temperature wear-resistant CREE rare earth heat-resistant steel for a fluidized bed hood of a power station and a preparation method thereof. The high-strength steel comprises the following chemical components in percentage by weight: 0.2%-0.5% of C, 1.5%-2.5% of Si, 6.0%-13.0% of Mn, 15.0%-25.0% of Cr, 1.0%-5.0% of Ni, 0.1%-1.0% of Mo, 0.05%-0.50% of V, 0.05%-0.50% of Nb, 0.2%-0.6% of N, 0.005%-0.5% of RE and the balance of Fe. According to the high-temperature wear-resistant rare earth heat-resistant steel, strong solid solution strengthening and precipitation strengthening effects are generated through C and N co-alloying and V and Nb micro-alloying, and the initial strength of the hood is improved; by means of rare earth microalloying, the high-temperature structure is stabilized, the high-temperature strength attenuation rate is reduced, and high-temperature abrasion and deformation of the hood are reduced. Moreover, an intermediate frequency furnace high-nitrogen alloying technology, a high-purity rare earth treatment technology and a shell mold precision casting technology are adopted to obtain a hood casting which is uniform in component, compact in structure and excellent in performance, and the technical problems that the hood is seriously abraded by high-temperature dust and the like can be effectively solved.

Description

technical field [0001] The invention relates to the field of energy and electric power, in particular to a high-temperature wear-resistant CNRE rare-earth heat-resistant steel for a fluidized bed hood of a power station and a preparation method thereof. Background technique [0002] As a clean and efficient power generation technology, circulating fluidized bed has been widely used in thermal power boilers. The air distribution device of the circulating fluidized bed is mainly composed of a support plate, an air cap, an air chamber and a slag discharge pipe. Among them, the hood is located in the place with the worst combustion environment. It has been affected by the high temperature (900-1000°C) of fuel combustion for a long time and washed away by high-concentration coal powder, which is prone to high-temperature wear and deformation. Therefore, the high temperature wear resistance of the air cap directly determines whether the fluidized bed can run safely and stably. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/34C22C38/44C22C38/46C22C38/48C22C38/58C21C7/00B22C9/04C21C7/06C22C33/06
CPCC22C38/02C22C38/34C22C38/58C22C38/44C22C38/46C22C38/48C22C38/001C22C38/005C22C33/06C21C7/0006C21C7/06B22C9/04
Inventor 胡小强郑雷刚夏立军李殿中
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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