Superalloys and the Development of Advanced Ultra-Supercritical Power Plants

Abstract:

A 700 advanced ultra-supercritical (A-USC) power plant technology project was initiated in China in the year of 2011. The highest temperature components in A-USC boiler are superheater and reheater tubes. The fire-side metal temperature can reach 750 (even higher). Based on the very long time service (30-40 years) these important high temperature tubes require 10⁵h long time stress rupture strength higher than 100MPa and the corrosion/oxidation layer loss less than 2mm for 2×10⁵h. The highest temperature components in 700 steam turbine are the buckets of different stages and require very long service time. At this severe condition only superalloys can fulfill these unusual requirements. This paper reviewed Fe-Ni and Ni-base superalloys from the view point of structure stability and long term mechanical properties and corrosion/oxidation resistance for 700 A-USC power plant materials selection.

• Periodical: Materials Science Forum (Volumes 747-748)
• Pages: 594-603
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.747-748.594
• Online since: February 2013
• Authors: Xi Shan Xie, Cheng Yu Chi, Shuang Qun Zhao, Jian Xin Dong, Fu Sheng Lin
• Keywords: 700ºC A-USC Power Plant, Fe-Ni, Ni Based Superalloy, Structure Stability

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