We have an application that requires the building of a mock-up for training firefighters. The mock-up will be steel (plate/sections and approximately 30 feet long and 10 foot high) and will be exposed to a fuel-rich propane fire (probably in the 600ºC or higher range). The duration of the fire will be sufficiently long to ensure the mock-up has achieved near maximum temperature and since it is a firefighter trainer it will be hit with multiple streams of cold water. Therefore, the structure will experience repeated heating and quenching cycles and, with a planned life of 10 to 15 years, the number of cycles will be in the 10000 range. ASTM A387 chrome-molybdenum alloy steel seems to be suitable for the temperature but what effect would the quenching have on performance (mainly buckling)? Does anyone have any guidance on what steel alloy would suit so that a performance and cost comparison could be carried out.