The "square tube for containers" typically refers to the square steel tube or tubular structure used in the manufacture of containers. It plays a crucial role in the design and production of containers.

Primary Locations:

1. Framework Support: The square tube serves as the main support structure of the container, forming its skeleton and ensuring overall structural strength and stability.
2. Corner Protection: The corners of the container are the most vulnerable areas, and the square tube effectively protects these regions from damage during transportation and handling.
3. Connecting Components: The square tube is also used to connect various parts of the container, such as the sidewalls, roof, and floor, to form a complete structure.

Functions:

1. Bearing and Weight Distribution: Containers need to carry a significant amount of cargo, and the square tube effectively distributes this weight to ensure that the container does not deform or damage due to excessive load.
2. Impact and Vibration Resistance: During transportation, the container is subjected to various impacts and vibrations. The structural design of the square tube absorbs these impacts, protecting the cargo from damage.
3. Providing Stable Structure: The container structure formed by the square tube is stable and not prone to deformation, ensuring the safety of the cargo during transportation.

In summary, the "square tube for containers" occupies an important position in the design and manufacture of containers, serving as a crucial component in ensuring their structural strength, stability, and safety.