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Monday, March 23, 2009: 2:20 PM
C303 (Georgia World Congress Center)
In collaboration with different industrial actors, a new austenitic stainless steel has been developed for use in advanced coal fired power boilers
The grade is designed for high creep- and oxidation resistance, high microstructural stability and good fabricability. It can be utilized at temperatures up to around 700°C, higher than other stainless steels.
The temperature strength is reached by precipitate strengthening through precipitations of Nb(C,N), fine NbCrN, M23C6 and Cu-rich precipitates. Addition of W further improves the strength.
Code cases as per The American Society of Mechanical Engineers Boiler and Pressure Vessel Code, Section I and Section VIII, are applied for.
Tubes were installed 2004 and 2005, in test loops, in three coal fired power boilers inEurope .
The obtained test results indicate that the grade has high oxidation resistance and higher mechanical properties than other known austenite. It is furthermore a more economical alternative to nickel base alloys.
The paper presents properties and results from manufacturing and testing during the development and verification of data for the new material.
The grade is designed for high creep- and oxidation resistance, high microstructural stability and good fabricability. It can be utilized at temperatures up to around 700°C, higher than other stainless steels.
The temperature strength is reached by precipitate strengthening through precipitations of Nb(C,N), fine NbCrN, M23C6 and Cu-rich precipitates. Addition of W further improves the strength.
Code cases as per The American Society of Mechanical Engineers Boiler and Pressure Vessel Code, Section I and Section VIII, are applied for.
Tubes were installed 2004 and 2005, in test loops, in three coal fired power boilers in
The obtained test results indicate that the grade has high oxidation resistance and higher mechanical properties than other known austenite. It is furthermore a more economical alternative to nickel base alloys.
The paper presents properties and results from manufacturing and testing during the development and verification of data for the new material.