I have been doing some research on coal-fired super-critical and ultra-super-critical power plants (steam temperature and pressure >565C and 250Bar). It seems that for the non USA market, the materials of choice for main steam pipes/headers are A182 Gr P91 and P92 but in the USA the materials of choice seem to be A182 Gr 304 and 347.
1. Is this true? 2. If yes, why? 3. Are there other pipe materials commonly used for >565C, <620C steam temperatures?
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