In this research, development of novel Ti-Ni intermetallic coatings on carbon tool steels has been investigated. For this purpose, nickel coatings as thickness of 20 mm were electrodeposited on steel specimens.Subsequently precoated specimens were titanized for a period of 6hs in an optimized pack cementation mixture of ferrotitanium, aluminium oxide, and ammonium choloride. In order to obtain the optimum intermetallic coatings and to reduce the compositional and hardness profile gradients, diffusion annealing process was performed on the specimens in an argon- controlled atmosphere. The microstructure and the phases developed in the coating were identified by metallography, microhardness, X-ray diffraction, and glow discharge optical spectroscopy techniques. Experimental results indicated that six distinct layers had been developed on the surface. The intermetallic compound layer of Ti2Ni was formed on the first surface and TiNi, TiNi3, TiNi , Ti2Ni+Ti(a) and FeNi compound layers formed werre beneath the surface.