to rupture by virtue of the propagation of microfissures which may form during the operation of the internal combustion engine this occurs as a result of the greater presence of hard phases carbides following the nitriding and in this manner the greater disposition to crack propagation subsequent to these being initiated in the interface between the hard phases and the matrix the invention has the objective on the one hand of providing a piston ring 10 having the same hardness characteristics and consequently high wear resistance nevertheless promoting a greater tenacity in the ring such as to improve the qualities thereof of fatigue strength both static and dynamic in order to minimize or even eliminate problems related with the rupture of the ring in this sense the invention concerns a ring 10 of an internal combustion engine 20 mounted upon the piston 24 of the engine 20 and in contact with the cylinder 22 wall or liner the ring is realized in a particular manner in a stainless steel 12 comprising between 8 and 15 by weight of chromium in addition to other elements and inevitable impurities the balance being formed by iron typically a stainless steel having these characteristics in the composition thereof comprises an average hardness lying between 350 and 420 hv chromium as is known by those versed in the art is an element.