Innovative applications in the field of materials engineering significantly enhance equipment reliability. The active gear utilizes 38CrMoAlA alloy steel treated with surface nitriding, achieving a surface hardness of HRC62. Coupled with the cobalt-based tungsten carbide coating process on the driven gear, the service life of the gear pair is extended to 20,000 hours. The pump body is cast with 4.5% molybdenum-containing heat-resistant cast iron, maintaining a Brinell hardness of over HB280 at 450°C high temperatures, with a thermal expansion coefficient controlled within 11×10^-6/°C, ensuring stability of assembly gaps under high-temperature conditions.Application Fields of High-Temperature Oil Pumps