Iron Sheets for Container Mobile Houses

The iron sheets of container mobile houses are usually made of galvanized steel sheets or color-coated steel sheets, and some high-end products use stainless steel sheets or composite sheets. The following is an elaboration from three aspects: material characteristics, application scenarios, and performance optimization.

Material Characteristics and Selection Basis

1. Galvanized Steel Sheets
   Based on cold-rolled steel sheets, the galvanized layer on the surface usually has a thickness of 60-100g/m². A dense oxide film is formed through the hot-dip galvanizing process, which can effectively resist wind and sand erosion as well as corrosion in humid environments. For example, the outer layers of container houses used in Inner Mongolia often adopt 0.6mm-thick galvanized sheets. Combined with a bottom elevated layer design, it can block the conduction of ground cold bridges, reducing the indoor temperature fluctuations by about 40% compared to traditional color-coated steel sheet houses.

2. Color-Coated Steel Sheets
   Based on galvanized steel sheets, the surface is coated with organic coatings (such as polyester and silicone-modified polyester), which are rich in color and have strong weather resistance. The container mobile houses produced by Beijing Falilai Company use color-coated steel sheets as wall materials. Through special sound insulation and heat insulation filler treatments, they can achieve fire prevention, sound insulation, and heat insulation functions, suitable for construction sites, warehouses, and other scenarios.

3. Stainless Steel Sheets and Composite Sheets
   High-end products or those used in special environments (such as coastal areas with high salt spray) will use 304 stainless steel sheets, which have better corrosion resistance than galvanized steel sheets but are more costly. Some companies optimize the thermal performance through a broken-bridge lining structure (filling rigid polyurethane foam between the steel frame and the inner wall panels), reducing the heat exchange efficiency between the inside and outside of the container by about 40%.

Application Scenarios and Performance Adaptation

• Severe Cold Regions in the North: A three-layer structure design is adopted, with the outer layer being galvanized sheets to resist wind and sand, the middle layer filled with 80-100mm-thick rock wool as the main insulation layer, and the inner layer being PVC-coated steel sheets to reduce heat radiation. For example, the products of Baotou Xinxing Color Plate Steel Structure Manufacturing Co., Ltd. use this structure, making the indoor temperature 8-10 degrees Celsius higher than the outside in winter without heating.

• Temporary Accommodation and Eco-Friendly Buildings: The iron sheets need to meet the requirements of rapid assembly and disassembly while controlling the disassembly and assembly loss rate. Taking a 20-foot container as an example, its steel consumption is about 1.2 tons. If a one-time poured concrete temporary house is used, the carbon emissions per unit area are 2.3 times that of a container house.

Performance Optimization and Technological Innovation

• Anti-Corrosion Treatment: By shot blasting for rust removal and then spraying zinc-rich primer and polyurethane topcoat, the steel can maintain an effective service life of more than 15 years in the wind and sand and temperature difference environments of northwest China.

• Structural Reinforcement: To address the problem of insufficient floor stiffness caused by the large spacing between the longitudinal beams of the traditional container bottom frame, some companies adopt the method of adding C-shaped steel purlins between the bottom beams to evenly distribute the load to each main beam, enabling the container to maintain structural stability even when stacked three layers high.