<p>N80 steel is a widely used oil pipe material, which is often damaged due to wear and corrosion. Conventional nitriding technology can improve its wear and corrosion resistance to a certain extent, but there are problems such as slow nitriding speed and thin and brittle nitrided layer. In order to solve these problems, Ni₂Cr₁Ti_0.05La_x (x = 0, 0.01, 0.03 and 0.05) was deposited on the surface of N80 steel by laser cladding, then nitriding treatment was carried out. The effects of the rare earth La content on the nitriding speed and the structure, wear resistance and corrosion resistance of the composite treated samples were investigated. The results show that the trace addition of La does not change the phases of the cladded layers and nitrided layers, but it can significantly refine the grains, and increase the thickness and density of the nitrided layer with the increase in the La content. The hardness values of the Ni₂Cr₁Ti_0.05La_x cladded layers are much higher than that of the N80 substrate. With the increase in the La content, the wear resistance and the corrosion resistance are improved. Under the same experimental conditions, the nitriding speed of the sample with Ni₂Cr₁Ti_0.05La_0.05 is about four times as that of the sample without La, its wear volume and self-corrosion current densities in 3.5%NaCl solution are only about 3.1% and 25% of the conventional nitrided sample. The addition of La provides more heterogeneous nucleation, lattice defects and solid solution strengthening, which refines the grains and provides more channels for the diffusion of N. In addition, the laser cladding treatment not only improves the hardness gradient but also replaces the phase structure of the nitrided layer with CrN phase, which has better wear and corrosion resistance than Fe₄N. Therefore, the composite treatment greatly improves the nitriding efficiency and overall performance, solves the problems of conventional nitriding and has a broader application prospect.</p>