Transactions of Materials and Heat Treatment

Title：Material characteristics and quality state of FB2 rotor steel used in 620 ℃ high-efficiency thermal power unit

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ClassificationCode：TK265

year,vol(issue):pagenumber：2022,47(7):42-52

Abstract：

The manufacturing process, key procedures, alloying principles, strengthening mechanism and main performance characteristics of FB2 rotor forgings were systematically introduced, and at the same time, the manufacturing quality of FB2 rotor forgings from different manufacturers was compared and analyzed. Then, the performance differences of FB2 rotor forgings from different manufacturers were obtained, and the main reasons for its occurrence were analyzed. The results show that the main alloy element contents and room temperature tensile strength of FB2 rotor forgings produced by JSW, JCFC and Fomas are at the same level, and the microstructures are all 100% tempered martensite with uniform microstructure and properties. The quality difference of imported FB2 rotor forgings is mainly manifested in the difference of non-metallic inclusions, room temperature elongation and impact toughness, which is mainly caused by the difference in B content of FB2 rotor forgings. Thus, it is recommended that B content of FB2 rotor forgings is strictly controlled to prevent the precipitation of a mass of block BN inclusions, so as to ensure the comprehensive mechanical properties of FB2 rotor forgings. The results of this research can provide a technical basis for the purchase, ordering and quality acceptance of FB2 rotor forgings, and provide a reference for the domestic manufacture of FB2 rotor forgings.

Funds：

中国华能集团公司总部科技项目（HNKJ15-H03）

作者简介：田晓（1985-），女，硕士，高工 E-mail：tianxiao@tpri.com.cn

Reference：

[1]张学忠，刘健生，何文武，等. 12%Cr超超临界转子钢热变形行为及高温塑性本构方程[J]. 锻压技术, 2020,45(8): 184-189.

Zhang X Z，Liu J S，He W W, et al. Hot deformation behavior and high temperature plastic constitutive equation for 12%Cr ultra-supercritical rotor steel[J]. Forging & Stamping Technology, 2020,45(8): 184-189.

[2]熊林敞，田仲良. 超超临界汽轮机转子用耐热钢研究进展[J]. 上海金属, 2018,40(1): 90-94.

Xiong L C，Tian Z L. Development of heat-resistant steels used for ultra-supercritical steam turbine rotor[J].Shanghai Metals, 2018,40(1): 90-94.

[3]潘秀兰，王艳兰，梁慧智.国内外电渣重熔技术的发展与展望[J].鞍钢技术，2005，(2):5-10.

Pan X L, Wang Y L, Liang H Z. Development and prospect of electroslag remelting technology at home and abroad[J]. Angang Technology，2005，(2):5-10.

[4]庞庆，彭建强.625 ℃等级超超临界汽轮机高中压转子材料研究[J]. 汽轮机技术,2014,56(1):75-77.

Pang Q, Peng J Q. Study on high & intermediate pressure rotor for ultra-super critical steam turbine operating at 625 ℃[J]. Turbine Technology,2014,56(1):75-77.

[5]Semba H, Abe F. Creep deformation behavior and microstructure in high boron containing 9% Cr ferritic heat-resistant steels [A]. Advances in Materials Technology Proceedings from the 4th International Conference [C]. Hilton Head Island, USA, 2004.

[6]梅林波，沈红卫，王思玉，等. 625 ℃汽轮机转子材料的开发及性能分析[J].热力透平, 2012, 41(3): 184-187.

Mei L B, Shen H W, Wang S Y, et al. Development and property analysis of rotor material for 625 ℃ steam turbines[J]. Thermal Turbine, 2012, 41(3): 184-187.

[7]赵吉庆, 杨钢, 赵林，等. 高性能9%～12%Cr转子钢发展现状及锻件国产化概况[J].汽轮机技术，2021,63(1):71-76.

Zhao J Q, Yang G, Zhao L, et al. Developing of high-performance 9%-12%Cr rotor steels and localization overview of forging used for steam turbine rotors[J].Turbine Technology, 2021,63(1):71-76.

[8]李克俭, 蔡志鹏,吴瑶,等. FB2 马氏体耐热钢在焊接热作用下奥氏体相变过程研究[J].金属学报，2017，53（7）:778-788.

Li K J, Cai Z P, Wu Y, et al. Research on austenite transformation of FB2 heat-resistant steel during welding heating process[J]. Acta Metallurgica Sinica, 2017，53（7）:778-788.

[9]田晓，秦承鹏，徐慧,等.620 ℃汽轮机用FB2转子钢高温时效过程的组织与性能演变[J].中国电机工程学报,2021，41(9):3232-3240.

Tian X, Qin C P, Xu H, et al. Microstructure and mechanical properties evolution of FB2 steel used for 620 ℃ steam-turbine during high temperature long-term aging[J]. Proceedings of the CSEE，2021, 41(9):3232-3240.

[10]罗国华，张帆，范植金，等.含硼氮中碳铝镇定钢中BN夹杂析出热力学分析[J]. 武汉科技大学学报，2014，37(6)：406-410.

Luo G H, Zhang F, Fan Z J, et al. Thermodynamic analysis of BN inclusion precipitation in medium-carbon aluminum killed steel containing B and N[J]. Journal of Wuhan University of Science and Technology, 2014，37(6)：406-410.

[11]周斌，高振桓，李清松，等. 超超临界汽轮机转子FB2材料性能及蠕变组织演化规律研究[J].东方汽轮机, 2016, (1): 42-49.

Zhou B, Gao Z H, Li Q S, et al. Property and microstructural evolution of FB2 used for rotor of ultra-supercritical steam turbine [J]. Dongfang Tubine, 2016, (1): 42-49.

[12]Gianfrancesco A D, Cipolla L, Venditti D. High temperature properties and creep behavior of a CrMoCoB （FB2） steel trial rotor[A]. 17th International Forgemasters Meeting[C]. Santander,Spain:AFID Congresos，2008.

[13]Kern T-U, Scarlin B, Donth B. The european COST536 project for the development of new high temperature rotor materials[A]. 17th International Forgemasters Meeting[C]. Santander：AFID Congresos，2008.

[14]Gianfrancesco A D, Cipolla L, Venditti D, et al. The role of boronin long term stability of a CrMoCoB (FB2) steel for rotor application[A]. Advances in Materials Technology Proceedings From the 6th International Conference[C].New Mexico, 2010.

[15]GB/T 10561—2005, 钢中非金属夹杂物含量的测定标准评级图显微检验法[S].

GB/T 10561—2005, Steel—Determination of content of nonmetallic inclusions—Micrographic method using standards diagrams[S].

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