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 The production of hydrogen from natural gas and steam requires the use of catalyst tubes in a fired heater. These large heaters use pressure, temperature and catalyst to produce the desired reaction to produce hydrogen. Since the furnace operating temperatures are lower than that of ethylene pyrolysis furnaces, and the lack of carburizion attack, the ability of the catalyst tube resist creep at temperature is of key importance. Catalyst tubes are typically made from HK or HP alloys. Versions of these base alloys have been modified through microalloy additions to enhance their high temperature strength and creep resistance.
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