CAJ | 학술논문

简要介绍和比较了国内外700℃超超临界电站过热器和再热器管候选材料GH2984、Haynes 230、CCA 617、Nimonic 263、Inconel 740及其改型合金Inconel 740H的组织、持久强度和耐腐蚀性能等研究结果,对几种材料的强度、耐腐蚀性能、工艺性能和使用经济性进行了分析,并阐述了中国在发展700℃超超临界燃煤电站时锅炉用高温合金的选择.结果表明：Inconel 740H合金具有的持久强度最高、耐蚀性能最好,工艺性能和使用经济性良好,比Inconel 740合金具有更好的长期组织稳定性,它应是中国700℃超超临界锅炉过热器和再热器首选的管材;针对700℃超超临界机组用关键材料,提出了尽早开展自主研制,实现关键材料国产化的建议.
간요개소화비교료국내외700℃초초림계전참과열기화재열기관후선재료GH2984、Haynes 230、CCA 617、Nimonic 263、Inconel 740급기개형합금Inconel 740H적조직、지구강도화내부식성능등연구결과,대궤충재료적강도、내부식성능、공예성능화사용경제성진행료분석,병천술료중국재발전700℃초초림계연매전참시과로용고온합금적선택.결과표명：Inconel 740H합금구유적지구강도최고、내식성능최호,공예성능화사용경제성량호,비Inconel 740합금구유경호적장기조직은정성,타응시중국700℃초초림계과로과열기화재열기수선적관재;침대700℃초초림계궤조용관건재료,제출료진조개전자주연제,실현관건재료국산화적건의.
Research achievements on major candidate materials for superheater/reheater tubes of plants at home and abroad are reviewed and compared,such as the GH2984,Haynes 230,CCA 617,Nimonic 263,Inconel 740 and Inconel 740H,while their microstructure,stress rupture strength and corrosion resistance as well as their workability and economy were analyzed.A discussion is moreover carried out to the selection of superalloys for superheater/reheater tubes of domestic 700 ℃ A-USC power plants.Results show that superalloy Inconel 740H exhibits the highest stress rupture strength,strongest corrosion resistance,better workability and economy among above six alloys;its microstructure is more stable than that of Inconel 740 during long term aging,which is therefore at present believed to be most preferable for superheater/reheater tubes of domestic 700 ℃ A-USC power plants.For localization of key materials for relevant power plants,it is suggested that RD on these materials should be performed as early as possible.