燃煤电站用大型铸锻件材料设计及热处理现状

doi:10.13228/j.boyuan.issn0449-749x.20220497

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Abstract The research status of material design and heat treatment of steel and alloy used for large castings and forgings of coal-fired power station is reviewed from the aspects of development background,development history,alloying characteristics,heat treatment process,microstructure and evolution. Advanced industries such as Europe,America and Japan have made remarkable achievements in the research,development and production of large castings and forgings for coal-fired power stations after decades of continuous investment and efforts. Our country also made large investment in this aspect,since 1980,pay attention to the study of subcritical,supercritical rotor material,to the ultra supercritical materials after 2000,2015 to present advanced supercritical materials research,on the basis of the introduction of digestion-absorption,has obtained certain achievements,began to create new steel and alloy with independent intellectual property rights,And realized the stable supply of some products. With the increase of coal steam parameters,the chemical composition of steel used for large forgings tends to be complicated,and the 10⁵h extrapolation endurance strength of steel increases continuously. In the composition design of new martensitic heat resistant steel castings,more attention is paid to the application of trace elements B and N,and the compound addition of W,Mo and Co. Domestic scholars have reported many researches on the microstructure and mechanical properties of steel for large forgings,and the researches are more in-depth and systematic. It is necessary to strengthen the creation of prototype steel grade or alloy by using the new material design method combined with the existing strong plastic processing ability in China. Sufficient attention should be paid to the research and development of generator rotor protection ring materials,which should be strengthened. The key physical properties of several typical steels for rotor,turbine cylinder and valve were compared and analyzed. The future development direction of steel or alloy materials for large castings and forgings used in ultra-supercritical power plants with high parameters is discussed based on experience.

Key words： large casting and forging part martensitic heat resistant steel steel and alloy for retaining ring alloying heat treatment process

Received: 26 July 2022

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	WANG Jing-zhong
	YAO Hui-qin
	ZHAO Ji-qing
	YANG Xi-rong
	YANG Gang
	DING Kai-lun

Cite this article:

WANG Jing-zhong,YAO Hui-qin,ZHAO Ji-qing等. Design and heat treatment of large-scale casting and forging materials for coal-fired power stations[J]. Iron and Steel, 2023, 58(2): 19-29.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220497 OR http://www.chinamet.cn/Jweb_gt/EN/Y2023/V58/I2/19

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