Smart Alloying Eliminates Manufacturing Steps in Automotive Gears

The shift toward electrification, combined with the demand for greater energy efficiency, means that the automotive industry is undergoing a period of profound transformation. In particular, the increasing uptake of electric drivetrains calls for gears to meet increasing requirements for torque capacity, durability, and NVH (noise, vibration, and harshness), while also supporting more sustainable and cost-effective manufacturing. Historically, conventional carburizing steels like 20MnCr5 have proved successful in gear applications. However, they usually require post-treatment processes, including shot peening to achieve the required fatigue performance, and tooth root grinding for a further boost. These additional steps add complexity and cost. Against this background, Ovako has investigated the application of innovative alloying design to minimize intergranular oxidation and eliminate the need for post-treatment. The result of this program is 20NiMo9-7 (Ovako 158Q) that offers a potential pathway to more efficient, reliable, and sustainable gear manufacturing.