Abstract : The industrial aim of this work performed on Hadfield steels is to increase the railway crossings life. The work is divided in four parts. The first part analyses the problems encountered in present time on the railways crossings. The second part is a state of the knowledges on the properties of steels with composition near the actual one (GX120Mn13). Five alloys have been chosen, which have been submitted to mechanical and tribological tests in the third and the fourth parts. A device on a rotatory tribometer has been designed in order to perform rolling fatigue tests. An impact-sliding-wear machine has been designed and checked in order to impose to the materials solicitations near the service ones. With regard to the mechanical tests has been studied the behaviour in tensile and compression at strain rates till 10 s-1. These tests demonstrated the very high workhardening of these austenitic alloys. The tribological tests (rolling fatigue, impact-sliding wear tests) enabled to identify the alloys with the highest wear resistance.