Właściwości materiałów dodatkowych do spawania stali P92 stosowanych do budowy bloków na parametry super nadkrytyczne
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Abstract
Europejskie regulacje w zakresie obniżania emisji szkodliwych gazów do atmosfery mają decydujący wpływ na wymagania stawiane współczesnej energetyce. Poszukiwania efektywnych rozwiązań w zakresie ograniczenia emisji szkodliwych gazów do atmosfery stanowią od wielu lat największe wyzwanie dla współczesnej energetyki, jak również inżynierii materiałowej. Znaczny postęp w tym zakresie dokonał się wraz z wprowadzeniem nowego gatunku stali o 9% zawartości chromu typu T/P91, oraz w kolejnych latach także nowej generacji stali Cr-Mo, w tym charakteryzującą się 25÷30% wyższą odpornością na pełzanie stali T/P92. Wyższa odporność na pełzanie stali P92 umożliwia zastosowanie wyższych wartości parametrów pracy bloku do poziomu parametrów supernadkrytycznych. W artykule przedstawiono najważniejsze informacje na temat charakterystycznych przemian fazowych, doboru materiałów dodatkowych, jak również wpływu parametrów spawania i obróbki cieplnej na udarność.
Properties of T/P92 steel weld metal for ultra super critical power plants
Abstract
In order to achieve higher efficiencies and reduce emissions of environmentally damaging gases, new power generation technology requires high pressure and high temperature parameters. These have directly resulted in the introduction of ultra super critical (USC) plant and applications of a series of advanced Cr-Mo creep resistant steels. Among these newly developed ferritic steels, T/P92 has creep strength 25÷30% higher than the currently widely used modified 9% Cr steel T/P91 and has been specified as one of the major alloys for the construction of USC plant. The present paper summarises the important phase transformation characteristics and properties of matching filler metals for T/P92 steel and discus- ses factors that influence the performance of these weld metals.
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