Fire Resistance Rating and Testing of Stainless Steels

This resource explains fire testing and fire rating of stainless steel components. Stainless steels do not have an intrinsic fire rating but all families (austenitic, duplex, ferritic) have inherent oxidation resistance and elevated temperature strength. Testing is done on specific grades under precise conditions according to BS 476 Parts 20, 21 (load bearing elements) and 22 (non load bearing elements). The results of fire test show that for load bearing applications stainless steel has better heat resistance than carbon steels, melting at 1375 degrees C and maintaining 55% of its ambient temperature 0.2% proof stress at 800 degrees C.