For this spiral bevel gear, we recommend using 20CrMnTi alloy steel processed with Carburizing and Quenching for gear materials and heat treatments. This material offers an exceptional balance of surface hardness and core toughness. The carburizing process involves heating the gear in a carbon-rich atmosphere to around 930°C, allowing carbon to diffuse into the surface layer to form a high-carbon case. Subsequent quenching (usually in oil) transforms the surface austenite into martensite, achieving a surface hardness of HRC 58–62, which provides excellent wear and pitting resistance. The core retains a tough, ductile structure (such as tempered martensite or ferrite-pearlite), ensuring strong impact resistance and preventing brittle fracture under heavy loads. Compared to 40Cr, 20CrMnTi delivers deeper and more uniform hardening, making it far more durable in demanding applications. Post-heat treatment, we perform gear lapping (running-in) to eliminate microscopic imperfections and ensure optimal tooth contact, resulting in quiet and reliable operation. All processes are traceable, and we provide full inspection documentation, including hardness mapping and metallographic analysis, to ensure compliance with international quality standards.