The following three types of containers are commonly used for transporting steel pipes, all of which conform to ISO 668 international standards:

1. 20-foot standard container (20'GP)
Inner dimensions: 5.89m (length) × 2.35m (width) × 2.39m (height)
Load capacity: Approximately 28 tons

2. 40-foot standard container (40'GP)
Inner dimensions: 12.03m (length) × 2.35m (width) × 2.39m (height)
Load capacity: Approximately 26.5 tons (due to slightly lower structural strength than the 20'GP)

3. Specialty container
Open top: Expandable to 2.69m in height, suitable for lifting extremely tall and long steel pipes.
Flat rack: Has no side walls or roof, suitable for transporting large steel pipes with a diameter of 1m or greater, with a maximum load capacity of 40 tons (according to Maersk Line data).

Generally speaking, the internal length of a standard 20-foot container is approximately 5.898 meters, while the internal length of a 40-foot container is approximately 12.032 meters. Therefore, the length of steel cannot exceed these values.
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