ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
In order to improve the durability of high efficiency waste-to-energy boilers, it is essentialto develop and apply high temperature corrosion-resistant materials having a long life time accordingto the intensity of the corrosion conditions. Two types of high Cr-high Si-Fe-Ni base and high Cr-highSi-Ni-Fe base alloy seamless tubes; MAC-N (26Cr-3.5Si-11Fe-Ni base) alloy and MAC-F(23Cr-3.8Si-38Ni-Fe base) alloy respectively which contain no expensive Mo and have bettercorrosion resistance than the existing alloys under severe corrosive environments of wastecombustion gas, have developed. The optimum alloy composition range were defermined byconfirming the effect of the alloying elements on the corrosion resistance in the laboratory corrosiontests. Furthermore, the seamless tubes were mounted on the actual superheater of the 500oC/9.8MPahigh efficiency waste-to-energy boiler to examine the durability over a period of four years. As aresult, it was confirmed that the MAC-N and MAC-F alloys have better corrosion resistance than theAlloy625 and 310HCbN. In addition, it has become clear that corrosion resistance of both alloys isdisplayed through the formation of SiO2 rich protective scale due to the combined addition of theprincipal elements, Si, Cr, Fe and Ni. Under conditions of high Cl content molten deposits and severethermal cycle, the corrosion rate increases as the results of deterioration of protective oxidation scale
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.522-523.513.pdf
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