The pipe should be able to withstand high pressure and temperature for a long period.
Generally the tubes are made of stainless steel, copper alloys such as brass or
bronze, cupro nickel, or titanium depending on several selection criteria.
high press. seamless black steel is the most common economical material.
A thorough knowledge of the service applications is needed i.e.stress-bearing service; cyclic loading or not; frequency of cycling; impact or erosion effects; thermal expansion and contraction. Materials used for high-temperature steam piping, X20 (12 percent chromium, 1 percent molybdenum, 0.25 percent vanadium) and P91 (9 percent chromium, 1 percent molybdenum, 0.25 percent vanadium) are often used because of their very high creep rupture properties at elevated temperatures.
Mr.Loo Kian Sing actually the boiler materials selection is depents on the temperture of the area ... its have some techno-economical analysis and value a\engineering aspects .. mostly super heaters parts are made up SS , steam drum is made up of SA515 or SA516 & economizer , boiler bank is made up of of alloys steel... if you like to do brify study means use ASME section 2..
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