Thermal processing method of chromium-containing ferrite refractory steel

A heat treatment method and heat-resistant steel technology, applied in the field of thermal processing of metal materials, can solve the problems of small grain size unfavorable long-term creep, lack of application prospects, etc., and achieve the effect of easy operation and simple process steps

Inactive Publication Date: 2013-09-11
TSINGHUA UNIV
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Problems solved by technology

In the patent with publication number CN101565798, a unique treatment method is proposed for a 11%-13%Cr ferritic heat-resistant steel, but its main purpose is to obtain a certain volume fraction of ferrite and reduce the Ferrite grain size, it is well known that small grain size is not conducive to long-term creep, so this method lacks application prospects in actual production applications

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  • Thermal processing method of chromium-containing ferrite refractory steel
  • Thermal processing method of chromium-containing ferrite refractory steel
  • Thermal processing method of chromium-containing ferrite refractory steel

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Embodiment Construction

[0018] The heat treatment method of the chromium-containing ferritic heat-resistant steel proposed by the present invention, the weight percentage of each element in the ferritic heat-resistant steel is:

[0019]

[0020]

[0021] Surplus is Fe, it is characterized in that this heat treatment method comprises the following steps:

[0022] (1) Heat the ferritic heat-resistant steel parts to 1050 ° C ~ 1250 ° C, and keep it warm for 1 to 2 hours;

[0023] (2) Cooling the ferritic heat-resistant steel part in step (1) to 800°C-900°C, keeping it warm for 1-2 hours, and water quenching to room temperature;

[0024] Or: cooling the ferritic heat-resistant steel parts in step (1) to 800°C-900°C, deforming the ferritic heat-resistant steel parts to reduce the thickness of the ferritic heat-resistant steel parts by 20%-70 %, heat preservation for 1 to 2 hours, water quenching to room temperature; (3) heat the ferritic heat-resistant steel parts in step (2) to 700°C to 800°C, hea...

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Abstract

The invention relates to a thermal processing method of chromium-containing ferrite refractory steel, belonging to the technical field of thermal processing of metal materials. The thermal processing method comprises the following steps of: heating a ferrite refractory steel component to 1050-1250 DEG C, and keeping the temperature for 1h-2h; cooling down to 800-900 DEG C, keeping the temperature for 1h-2h, water quenching to room temperature, or cooling down to 800-900 DEG C, carrying out deformation treatment on the ferrite refractory steel component so as to reduce the thickness of the ferrite refractory steel component by 20%-70%, keeping the temperature for 1h-2h, and water quenching to room temperature; finally, heating to 700-800 DEG C, keeping the temperature for 1h-5h, and air cooling to room temperature. By adopting the thermal processing method, MX phase precipitation is controlled through moderate-temperature heat treatment, and M23C6 phase precipitation is controlled by tempering, thus achieving the effect of regulating an MX phase and an M23C6 phase respectively. The method of the invention has the characteristics of simple process steps, easy operation and the like, and is an effective means for performance optimization of ferrite refractory steel.

Description

technical field [0001] The invention relates to a heat treatment method for ferritic heat-resistant steel containing chromium, in particular to a heat treatment method for ferritic heat-resistant steel containing 9%-12% chromium, and belongs to the technical field of thermal processing of metal materials. Background technique [0002] In recent years, with the rapid development of the national economy, there has been a shortage of power consumption in most parts of the country, and it is imminent to vigorously develop power construction. As a resource-based country that is rich in coal, short of oil, and low in gas, my country's thermal power generation is the main power generation method. This situation will continue for a long time to come, and the average coal consumption level of thermal power units in my country is about 357g / kWh, the average thermal efficiency is about 33%, which is far lower than the average thermal efficiency of 40% in advanced industrial countries. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00C22C38/26
Inventor 张弛张芮辉杨志刚夏志新
Owner TSINGHUA UNIV
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