To establish a localized heat treatment technique, a heat treatment test plate capable of withstanding destructive testing was developed. Through boundary condition analysis, the equivalent boundary conditions for both the heat treatment test plate and the process equipment were determined. The numerical thermal simulation method, implemented by ANSYS software and validated through experiments, was employed to analyze the heat treatment process for the test plate and the corresponding equipment. The results demonstrate that the temperature distribution and holding temperature of the test plate align closely with those of the equipment, confirming the feasibility of deriving the equipment’s heat treatment technique from the test plate results. However, the complex manufacturing processes of the test plate make single-use applications economically unviable. To enhance its utility, thermodynamic and heat transfer calculations were used to formulate equations for test plates with varying materials and thicknesses. These formulas allow for the determination of heat treatment techniques for equipment of different materials and thicknesses using a single test plate. The results indicate that the temperature gradient across the plate thickness increases with thickness, and when the thickness exceeds 120 mm, single-sided heating may cause treatment failure due to excessive temperature differences between the two sides. Moreover, material properties such as specific heat capacity and thermal conductivity influence the heat treatment process: materials with higher specific heat capacity have lower thermal conductivity, and higher heat treatment temperatures require longer processing times and greater energy consumption.