Abstract: Abstract: There is a problem that subsoiling shovel tips are poor in wear resistance and lose effectiveness frequently. In order to solve the problems of poor wear resistance and frequent failure, Fe-Cr-Ni alloy coating was prepared on 45 steel substrate using flame spray welding process. And the spray welding coating has been quenched using the specimen residual temperature. The quenching temperature is 800 ℃. Microstructure, composition and phase of alloy coating were analyzed by scanning electron microscope, energy dispersive spectrometer, and X-ray diffraction. The microhardness was tested by microhardness tester. The wear properties were tested by soil abrasive wear testing machine. The results showed that the coating zone, binding zone and substrate zone are obvious, metal interpenetration phenomenon has been found in binding zone, and metallurgical bonding can be achieved between the coating and substrate. The good metallurgical bonding can be obtained between the coating and iron substrate. The alloy coating consists of carbide Cr7C3 and Cr23C6, boride Fe2B, (Cr,Fe)7C3 and solid solution γ-Fe(Cr,Ni,C,Si) and (Fe,Ni). On the effect of oxygen and acetylene hot resource, Fe and Cr elements in the alloy were heated to molten state, and then Fe, Cr and C, B were combined to form carbide and boride. As the role of the austenite stable element Ni, there is γ-Fe (Cr,Ni,C,Si) solid solution formed in the coating, which is helpful to reduce the brittleness of the spray welding layer. Compared with the unquenched coating, the microstructure of quenched coating is refined, and the hard phase is shown as rectangular block, lozenge block and ball block, whose size is from 5 to 20 μm. The microhardness of the quenched coating can reach up to 900 HV, and the average microhardness is about 800 HV, increased by about 100 HV compared with the unquenched coating. The contrast tests have been carried out between quenched coating, unquenched coating and 65 Mn subsoiling shovel tip. The average wear loss of quenched coating is about 0.30 g, that of the unquenched coating is about 0.35 g, and the average wear loss of 65 Mn subsoiling shovel tip is about 0.50 g, about 2 times as much as the quenched coating. After carrying out field test, the wear loss of subsoiling shovel tip with quenched coating is 32 g, and 65 Mn subsoiling shovel tip is 70 g. As shock cooling effect of quenching, alloy elements transfer is difficult, which is not conducive to the growth of carbide. As a result, the carbides are refined. Furthermore, supersaturated solid solution of carbon is formed owing to diffusion failure of some carbon elements. The supersaturated solid solution leads to the increase of dislocation density, the lattice distortion, and the hardness increase. The dispersion distribution of hard phase Cr7C3, (Cr,Fe)7C3, Cr23C6 and Fe2B is obtained on the softer substrate. The hard phase plays a role of increasing the energy consumption of the abrasive, and reducing the cutting and ploughing effect of abrasive grains on the coating surface. The hard phase, supersaturated solid solution and Fe, Ni have been fused together, showing alternate distribution. The substrate metal with good toughness has good bonding effect on hard phase. There is good wear resistance for quenched coating. The spray welding coating has been quenched using the coating residual temperature successfully. The cost of quenching process is low and the efficiency is high. The process is convenient and flexible, which can meet the needs of the subsoiling shovel surface strengthening and practical application.