Recent Developments in Niobium Containing Austenitic Stainless Steels for Thermal Power Plants
The challenge of growing continuously in a sustainable way is the main driver to improve efficiency in the use of natural resources.The increasing demand for energy has made thermal power based countries to set audacious programs to increase efficiency of thermal power generation.In China,coal-burning accounts nowadays for approximately 65%of the total primary energy supply being responsible for around 25%of the countries CO2 emission,this coal-based energy supply scenario is believed to continue until 2020.Therefore,the country has invested strongly in the last years in the construction of more efficient power plants.To attend higher operating temperatures and steam pressures,the application of higher performance materials is mandatory,presenting improved mechanical resistance-to stand the higher pressures applied-and having sufficient high temperature and corrosion resistance with the best cost-benefit relation possible.The present work addresses some research developments made in niobium containing austenitic stainless steels for super heaters and re-heater tubes in the past years as a joint effort between industry and academia to understand mechanisms and optimize the steel chemical composition,improving its performance.Niobium role has been studied in detail in heat resistant stainless steels TP347H,Super 304 and HR3C,a summary of such studies is presented in this paper.Niobium improves high temperature properties as it precipitates as nano-size MX and NbCrN,well dispersed in the matrix,hindering dislocation movement,increasing precipitation strengthening and creep resistance.
niobium power generation creep high-temperature corrosion resistance
Mariana Perez de Oliveira Wei Zhang Hongyao Yu Hansheng Bao Xishan Xie
Companhia Brasileira de Metalurgia e Minera(c)(a)o 12901,Av das Na(c)(o)es Unidas,230 andar,S(a)o Pa CITIC Metal,Capital Mansion 1903,Beijing 100004,China China Iron & Steel Research Institute Group,Beijing 100081,China University of Science & Technology Beijing,Beijing 100083,China
国际会议
Energy Materials 2014(第一届能源材料国际会议)
西安
英文
271-277
2014-11-04（万方平台首次上网日期，不代表论文的发表时间）