PURPOSE: To obtain a steel for a piston ring with superior wear, corrosion and thermal fatigue resistances at the service temp. of the piston ring by adding specified amounts of C, Si, Mn, Ni, Cr, Mo and V.

CONSTITUTION: The composition of a material for a piston ring is composed of, by weight, 0.5W1% C, <1.5% Si, <1% Mn, <2% Ni, 11W13% Cr, 0.4W1.5% Mo, <1.5% V and the balance Fe with inevitable impurities. This steel is refined, worked into the shape of a ring, and subjected to hardening and tempering under restraint in the shape to obtain a ring product. The resulting piston ring has superior performance and enables a reduction in the size of the ring product.