An integrally cast steel piston for internal engines formed by pouring a cast steel into a sand mold having a cavity having a shape of said integrally cast steel pistons, wherein said cast steel has a microstructure containing eutectic carbides forming eut...

An integrally cast steel piston for internal engines, the cast steel having (a) a composition comprising 0.8% or less of C, 3% or less of Si, 3% or less of Mn, 0.2% or less of S, 3% or less ofNi, 6% or less of Cr, 6% or less of Cu, and 0.01-3% of Nb, the b...