Usually, a kiln operates with inside temperature in excess of 1000°C for calcination of raw material.
And the steel shell plate is protected with suitable refractory. Upon suitable refractory installation with the requires specifications, maximum shell temperature observed on the outer surface of the shell is 300°C. Exceedance of the temperature on outer surface, the steel shell plates develop warpage upon continuous exposure to the higher temperature. The condition demands higher strength steel for the purpose of better reliability and longer life. IS 2041 Grade B, ASTM 560 Gr 70 is an appropriate material for cement kiln shells.
Allan Smith supplies the supply of kiln shells with suitable grade steel, if requires outer surface is machined for enhanced reliability. The choice is made upon extensive engineering to ensure Extended reliable operation