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Ferritic heat-resistant steel used for coal-fired thermal power generation boiler piping and valve castings and preparation method thereof

A boiler tube and heat-resistant steel technology, applied in the field of metal materials, can solve the problems of lack of heat resistance and strong corrosion resistance, and achieve the effect of excellent high-temperature corrosion resistance, low price and strong corrosion resistance

Active Publication Date: 2017-05-24
JIANGSU SHENGTAI VALVE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is a lack of a ferritic heat-resistant steel with strong heat resistance and corrosion resistance for coal-fired thermal power generation boiler piping and valve castings and its preparation method

Method used

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  • Ferritic heat-resistant steel used for coal-fired thermal power generation boiler piping and valve castings and preparation method thereof
  • Ferritic heat-resistant steel used for coal-fired thermal power generation boiler piping and valve castings and preparation method thereof
  • Ferritic heat-resistant steel used for coal-fired thermal power generation boiler piping and valve castings and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A ferritic heat-resistant steel used for coal-fired thermal power generation boiler pipelines and valve castings of the present invention, the ferritic heat-resistant steel used for coal-fired thermal power generation boiler pipelines and valve castings is calculated by mass percentage Consists of the following components:

[0032]

[0033]

[0034] The preparation method of the ferritic heat-resistant steel used for coal-fired thermal power generation boiler pipelines and valve castings according to the present invention comprises the following steps:

[0035] (1) Batching is carried out according to the above-mentioned component distribution ratio, and the selected furnace materials include: pig iron, scrap steel, ferrosilicon, ferromanganese, micro-carbon ferrochrome, ferro-niobium, ferro-vanadium, aluminum wire, etc.

[0036] The ferritic heat-resistant steel described in the present invention is developed to solve the serious corrosion problems faced by power...

Embodiment 2

[0055]The difference between Embodiment 2 and Embodiment 1 is that a ferritic heat-resistant steel used for coal-fired power generation boiler pipelines and valve castings of the present invention is used for coal-fired power generation boiler pipelines and valve castings. Ferritic heat-resistant steel consists of the following components by mass percentage:

[0056]

[0057]

[0058] The preparation method of the ferritic heat-resistant steel used for coal-fired thermal power generation boiler pipelines and valve castings according to the present invention comprises the following steps:

[0059] In step (2), the proportioned raw materials are smelted and cast; smelting equipment is used in the smelting, and the smelting equipment is a vacuum induction melting furnace.

[0060] In step (4), the normalizing process is as follows: install a furnace below 200°C, heat up at a rate of 40°C / h, keep warm at 1050°C, and then air-cool;

[0061] The tempering process is as follow...

Embodiment 3

[0063] The difference between embodiment 3 and embodiment 1 is:

[0064] A ferritic heat-resistant steel used for coal-fired thermal power generation boiler pipelines and valve castings of the present invention, the ferritic heat-resistant steel used for coal-fired thermal power generation boiler pipelines and valve castings is calculated by mass percentage Consists of the following components:

[0065]

[0066]

[0067] The preparation method of the ferritic heat-resistant steel used for coal-fired thermal power generation boiler pipelines and valve castings according to the present invention comprises the following steps:

[0068] In step (2), the proportioned raw materials are smelted and cast; smelting equipment is used in the smelting, and the smelting equipment is an electric arc melting furnace.

[0069] In step (4), the normalizing process is as follows: install the furnace below 200°C, the heating rate is equal to 80°C / h, keep warm at 1050°C, and then air cool;...

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Abstract

The invention discloses a ferrite type heat-resistant steel used for coal-fired power generation boiler pipeline and valve type castings. The ferrite type heat-resistant steel used for the coal-fired power generation boiler pipeline and valve type castings comprises, by mass, 0.08-0.11% of C, 9.5-10.0% of Cr, 0.90-0.95% of Al, 2.00-2.20% of Ni, 0.40-0.44% of Si, 1.05-1.10% of Mn, 0.85-0.90% of Mo, 0.05-0.09% of Nb, 0.20-0.25% of V, 0.003-0.008% of N, and the balance Fe. The ferrite type heat-resistant steel is low in preparation price, high in heat resistance and high in corrosion resistance, and has a certain room temperature mechanical property.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a ferritic heat-resistant steel used for coal-fired thermal power generation boiler pipelines and valve castings and a preparation method thereof. Background technique [0002] Heat-resistant steel is often used in the manufacture of parts that work under high temperature conditions in industrial sectors such as boilers, steam turbines, industrial furnaces, power machinery, aviation and petrochemicals. At present, heat-resistant steels for thermal power boiler pipelines are mainly divided into two types: ferritic heat-resistant steels and austenitic heat-resistant steels. The price of austenitic heat-resistant steel is high, the coefficient of thermal expansion is large, and the thermal conductivity and processing performance are poor. In contrast, ferritic heat-resistant steel is low in cost, easy to process, has good thermal conductivity and welding performance, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/48
Inventor 赵成志严涛张贺新丁超张泽成汪中厚姜风春李伟朱海昌
Owner JIANGSU SHENGTAI VALVE CO LTD
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