Paper Title:
Long-Term Stabilization of Creep-Resistant Ferritic Steels for Highly Efficient Ultra-Supercritical Power Plants
  Abstract

Alloy-designing of high-strength ferritic heat resistant steels has been investigated for application to highly efficient, low emission ultra-supercritical power plant with maximum steam temperature of 700 oC. Ferritic heat resistant steels can be applied to the next highest temperature components and are strongly desired to expand their temperature range up to 650 oC in order to minimize the requirement of expensive nickel base superalloys. A dispersion of nanometer size MX nitrides along boundaries and the addition of boron significantly improve long-term creep strength. Newly alloy-designed 9Cr-3W-3Co-0.2V-0.05Nb steel with 160 ppm boron and 85 ppm nitrogen exhibits excellent creep strength of base metal and no degradation in welded joints at 650 oC. The protective Cr2O3-rich scale forms on the surface of 9Cr steel by pre-oxidation treatment in Ar gas, which significantly improves the oxidation resistance in steam at 650 oC.

  Info
Periodical
Edited by
Pietro VINCENZINI, Cynthia POWELL, Marco VITTORI ANTISARI, Vincenzo ANTONUCCI and Fausto CROCE
Pages
12-21
DOI
10.4028/www.scientific.net/AST.72.12
Citation
F. Abe, "Long-Term Stabilization of Creep-Resistant Ferritic Steels for Highly Efficient Ultra-Supercritical Power Plants", Advances in Science and Technology, Vol. 72, pp. 12-21, 2010
Online since
October 2010
Authors
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Fujio Abe
Abstract:The effect of boron on microstructure evolution and creep deformation behavior has been investigated for a tempered martensitic...
569
Authors: You Hwan Lee, Sang Yoon Lee, Duk Lak Lee
Abstract:In order to save natural resources and to reduce production costs, many industries have conducted studies on new developed steels and...
767
Authors: Alexander S. Chaus, Matej Beznák
Abstract:The microstructure and chemical composition of MC carbides in the modified variants of AISI M2 type high-speed steel after casting,...
1065
Authors: Liang Ying, Ying Chang, Ping Hu, Guo Zhe Shen, Li Zhong Liu, Xiao Dong Li
Abstract:The influence of low tempering temperature (TT) on mechanical properties and fracture toughness of ultra high strength boron steel 22MnB5 for...
160