Steel Content Requirements for Container Houses
The steel content requirements for container houses vary depending on design, purpose, and structural components, with the overall proportion of steel materials ranging from approximately 60% to 80%. The steel content of the main structure typically ranges from 25KG/m² to 80KG/m².
1. Steel Content by Structural Component
Structural Framework: As the core load-bearing part of container houses, the main structural steel accounts for the highest proportion, approximately 60% to 70%. This steel must possess high strength and resistance to deformation, typically using low-carbon alloy steels such as Q235 or Q345. The framework is formed through welding or bolting to ensure the overall stability of the house. For example, the steel content of the framework for a standard 20-foot container can exceed 1.2 tons, with a unit area steel content of approximately 40KG/m² to 60KG/m².
Wall Materials: Steel in the walls accounts for about 20% to 30%, mostly in the form of sandwich panels. These panels consist of two thin steel plates (0.4mm to 1.2mm thick) on the inner and outer layers, with insulation materials such as polyurethane or rock wool in between, meeting both structural strength and thermal insulation and fire resistance requirements. Some high-end products use fire-resistant boards instead of traditional steel plates to further reduce steel usage.
Roof and Floor: The roof accounts for about 10% to 15% of the steel content, commonly using fire-resistant sandwich panels or galvanized steel sheets, requiring waterproof and corrosion-resistant properties. The floor accounts for about 5% to 10% of the steel content, often using moisture-resistant cold-rolled steel sheets or checkered plates with a thickness of typically 1.5mm to 3mm to withstand human activity and furniture loads.
Other Components: Small components such as doors, windows, and connectors account for about 5% to 10% of the steel content. Door and window frames are mostly made of aluminum alloy (with low steel content), but connectors (such as corner fittings and bolts) require stainless steel or galvanized steel to ensure durability. For example, the steel content of corner fittings for a single container is about 20kg to 30kg, accounting for about 5% of the total steel content.
2. Range of Steel Content in the Main Structure
The steel content of the main structure of container houses is significantly influenced by size, number of floors, and design standards. Single-story standard containers (20 feet) have a steel content of approximately 25KG/m² to 50KG/m². Multi-story or customized containers (such as modular buildings) may have a steel content increased to 60KG/m² to 80KG/m² due to the need for enhanced structural strength. For example, in a three-story container apartment project, the unit area steel content reached 75KG/m², much higher than that of single-story products.
3. Design Optimization and Material Substitution Trends
To reduce costs or meet special requirements, some designs reduce steel usage. For example, using a lightweight steel structure framework combined with high-strength composite material walls can reduce the overall steel content to below 50%. Alternatively, optimizing joint design (such as using mortise-and-tenon joints instead of welding) can reduce the steel content of connectors. However, it should be noted that excessively low steel content may affect the house's earthquake and wind resistance, requiring a balance based on the usage scenario (such as temporary buildings or permanent residences).
