The frame is the most important load-bearing component in a car, and the longitudinal beam of the frame is one of the key parts, so the longitudinal beam plays an important load-bearing role in the car. The side beam frame, middle beam frame, etc. of the car all contain longitudinal beams.
Longitudinal beams are usually stamped from low-alloy steel plates, and their cross-sectional shape is generally groove shaped. Some are also made into Z-shaped or box shaped sections.
