A device for identifying a metal substrate present in a strongly metallic environment that may also be dusty. The device includes a passive radio-frequency identification (RFID) label, a label carrier suitable for being attached to the metal substrate and to position the label at a distance therefrom, and a RFID reader having an antenna that includes, as an induction loop, two sections of a coaxial cable having a substantially identical length and each including a metal core and a metal pleat surrounding the core, the two sections being linked together, on the one hand, at one end thereof by connecting the core of one to the pleat of the other and conversely and, on the other hand, at the other end thereof by connecting only the pleats together, the cores thereof being separated at said other end.