620 ℃高效火电机组用CB2铸钢件材质特性与质量状态分析

doi:10.11896/cldb.21090184

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Abstract The development of 620 ℃ high-efficiency USC power generation technology has gained intensive attention from China since 2013. The reheating system of the unit is facing a more severe service environment, as the temperature of reheated steam rises to 620 ℃. Hence, the traditional 12% martensitic heat-resistant steel cannot meet the service requirements of the key components of steam turbine, and CB2 steel cas-tings with better performance are thought to be good candidate for the manufacturing of massive castings, such as IP inner cylinder, and main or reheat steam valve. Herein, we systematically demonstrated the manufacturing process, key procedures, alloying principles, and main perfor-mance characteristics of CB2 steel castings. Moreover, the quality status of CB2 steel castings manufactured by domestic and imported manufacturers was compared and analyzed. It was found that the chemical composition and mechanical properties of those castings were comparable, with tempered martensite as the metallographic structure. However, compared with the imported products, the domestic CB2 steel castings still possessed some shortcomings in some aspects, involving precise control of grain size, non-metallic inclusions, and delta-ferrite content. It is believed that the conclusions can provide technical reference for the purchase, order, quality assessment of CB2 steel castings, and pave the way for their quality improvement of CB2 steel castings.

Key words： USC steam-turbine CB2 steel casting manufacturing quality chemical composition mechanical property

Published: 25 July 2023 Online: 2023-07-24

CLC number:

TG142.1

Fund:Science & Technology Found of China Huaneng Group Co., Ltd.(HNKJ18-H05).

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	Articles by authors
	TIAN Xiao
	LIU Delai
	XU Hui
	QIN Chengpeng
	LI Taijiang
	LI Yimin
	YANG Baixun

Cite this article:

TIAN Xiao,LIU Delai,XU Hui, et al. Analysis of Materials Characteristics and Quality State of CB2 Steel Castings for 620 ℃ High-efficiency Ultra-supercritical Steam-Turbine Unit[J]. Materials Reports, 2023, 37(14): 21090184-8.

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http://www.mater-rep.com/EN/10.11896/cldb.21090184 OR http://www.mater-rep.com/EN/Y2023/V37/I14/21090184

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