Materials for Container Mobile Housing
The main materials for container mobile housing include structural steel, enclosure panels, connectors, and anti-corrosion coatings, as detailed below:
Structural Steel
The core load-bearing structure of container mobile housing typically employs high-strength weather-resistant steel (such as Q355B grade), which offers approximately 30% higher yield strength than ordinary carbon steel, enabling the formation of a self-balancing system and reducing the need for external supports. For instance, rigid connections between corner fittings and side beams, along with corrugated longitudinal roof panels that disperse stress through their geometric shape, prevent local buckling while reducing material usage by about 15%. Some products utilize hot-dip galvanized cold-formed steel sections, which exhibit excellent rust and corrosion resistance, making them suitable for long-term use.
Enclosure Panels
The enclosure structure must balance thermal insulation, fire resistance, and durability:
- Rock wool sandwich panels: With a thickness of 75-100 mm, the fibers are arranged perpendicular to the heat flow path, resulting in a thermal conductivity below 0.040 W/(m·K). When combined with a 5 mm air gap to form a composite structure, the overall heat transfer coefficient (U-value) is below 0.5 W/(m²·K), effectively suppressing condensation risks.
- Aluminum-zinc alloy-coated steel sheets: As the outer layer material, they offer strong corrosion resistance and a service life exceeding 15 years.
- Fire-resistant materials: Some products adopt fire-resistant polyurethane sandwich panels, meeting fire resistance requirements above Grade B1 and delaying the spread of fire.
Connectors and Seismic Design
For regions with high seismic design intensities (e.g., intensity 7), connection nodes employ a "wedge-shaped lock + high-strength bolt" dual-fixing mode. The wedge-shaped lock, made of 45# steel through heat treatment with a 15-degree inclined surface angle, generates a self-locking effect under horizontal shear forces. During simulated magnitude 8 earthquakes, displacement is controlled within 3 mm, outperforming conventional welded nodes by approximately 40% in terms of deformation amplitude.
Surface Anti-Corrosion and Coatings
The coating system utilizes a "epoxy zinc-rich primer + polyurethane topcoat" combination:
- Primer: With a zinc powder content exceeding 80%, it protects the base metal through the sacrificial anode principle.
- Topcoat: Incorporating nano-silica particles, it achieves a hardness of 3H, resisting wind and sand erosion. Salt spray tests (ASTM B117 standard) demonstrate that this coating system remains free of red rust after 1000 hours, equivalent to a 15-year protection cycle in coastal or industrial pollution environments, supporting a 25-year service life for the main structure of the container body.
Other Materials
- Flooring materials: Commonly used are cement fiber boards or steel-wood composite floors, balancing strength and moisture resistance.
- Door and window systems: Employ broken bridge aluminum alloy or plastic-steel materials, paired with insulated glass, to enhance sound insulation and thermal insulation performance.
