1. Gearboxes: Steel casings for wind turbine gearboxes need to handle high stress and torque.

2. Turbine Hubs: The hub connects the blades to the rotor and requires strong materials for stability.

3. Yaw Systems: These parts help orient the turbine towards the wind, often made from robust cast steel.

4. Nacelle Frames: The nacelle houses the generator and other components, requiring a sturdy, cast structure.

5. Mounting Brackets: Used to secure various turbine components, these need to be reliable and strong.

6. Slewing Rings: Allow smooth rotation of the turbine, needing precise casting for optimal performance.

7. Base Frames: The foundational structure for the turbine, designed for stability and durability.

The casting process must ensure high-quality steel with the right properties, such as toughness, fatigue resistance, and corrosion resistance, to enhance the longevity and performance of wind turbines.