Process for processing valve seat

The invention provides a process for processing a valve seat, and relates to the technical field of valve seats. By adopting a laser alloying surface modification method, an in-situ synthesized particle reinforced nickel-based composite coating which is controllable in depth and forms firm metallurgical bonding with a base material is formed on the sealing surface of a valve seat main body; the hardness of the composite coating is 36-46HRC. According to the invention, Ni-based alloy powder is utilized to perform side powder injection laser alloying to prepare the in-situ synthesized particle reinforced nickel-based composite coating valve seat of which the thickness of the reinforced layer of a working sealed conical surface is 0.5-1.4mm.