Serrated metal gasket selects mild steel, carbon steel, copper, stainless steel, chromium steel, monel alloy steel, alloy of aluminum and other metal plate or rod by mechanical processing, surface processing into a 90 ?° angle between the ring gear. 
Can increase the inner, outer ring position. 
In order to protect the sealing flange and effective, you can paste in the gasket sealing surface layer, the material choice of PTFE, graphite and so on. 
        
Power plants (or nuclear power) Steam generators, marine generators in the heat exchanger or pipe flange gasket sealing gaskets, manhole gaskets, also can be used in chemical industry high temperature and high pressure sealing location.