Engine piston
The piston head is the
seat of the part above the piston pin, piston head of the piston ring, to
prevent the high temperature, high pressure gas into the crankcase, and prevent
oil from entering the combustion chamber; the top of the piston absorbed most
of the heat also passed to the cylinder through the piston head, and then
through the cooling medium.
The piston of a large marine low-speed diesel
engine is usually a crosshead type.
The heat treatment process by normalizing
and annealing, and iron pearlite are ferrite organization, has good heat
resistance.
Piston alloy quenched and tempered steel has better heat
resistance and corrosion resistance. The skirt with nodular cast iron annealing
treatment, with good wear resistance.