1.What are some possible indirect application methods?
As raw material, it is processed into standard profiles.
Mainstream practice: Modern standardized light steel prefabricated house frames primarily use "cold-formed thin-walled steel." This type of steel is made from galvanized cold-rolled steel coils, which are cold-bent into specific cross-sectional shapes (such as C-shaped steel, U-shaped steel, and square tubing) using a specialized roll forming production line. These components are then assembled into the house frame using bolts.
Conclusion: In this standard model, cold-rolled coils are the upstream basic raw material, not the "frame material" used directly on-site.
On-site non-standard fabrication (unconventional, not recommended)
In non-standard, temporary, or extremely low-budget situations, theoretically, thicker cold-rolled flat sheets (derived from leveled cold-rolled coils) can be cut and welded into a frame.
However, this presents significant problems:
No corrosion resistance: Ordinary cold-rolled sheets rust easily and are unsuitable for construction site environments exposed to sun and rain.
Low structural efficiency: The strength and stability resistance of a frame welded from flat sheets are far lower than that of structurally optimized cold-formed steel (such as C-shaped steel).
Quality is difficult to guarantee: On-site welding deformation is large, and precision and strength are difficult to control.
2.What is the core form of cold-rolled coil (after being processed into cold-formed thin-walled steel sections)?
C-shaped steel, U-shaped steel, etc., are produced in standardized factories.
3.What are the key points to note?
Surface anti-corrosion treatment is mandatory.
Cold-rolled steel sheets directly exposed to the elements will rust rapidly. If used, hot-dip galvanized (GI) or galvanized aluminum-zinc (GL) sheets must be used as raw materials, or the formed frame must undergo thorough anti-corrosion spraying treatment.
Building codes must be met.
Although prefabricated houses are temporary structures, safety is paramount. The load-bearing capacity of the frame (wind load, snow load, construction load) must be calculated or conform to established design drawings. Using non-standard materials makes it difficult to guarantee safety.
Thickness (material thickness) is critical.
The base material thickness of cold-formed steel used in load-bearing structures is typically 0.8mm to 2.0mm, depending on the span and load. Too thin (e.g., <0.8mm) results in insufficient rigidity and easy deformation; too thick makes cold bending difficult and uneconomical.
Reliability of connection nodes.
Bolt connection holes should be prefabricated in the factory to ensure accuracy. Randomly drilling on-site will weaken the cross-section and affect installation accuracy.
4.What are some suggestions for formal construction site prefabricated housing projects?
We strongly recommend purchasing standard prefabricated houses or container houses directly from professional manufacturers, using a "galvanized cold-formed thin-walled steel" frame. This is the safest, fastest, most economical, and highest-quality solution. The "cold-rolled coils" used here have been optimized (i.e., shaped and galvanized profiles).
5.If you want to purchase the materials yourself and build the structure, what suggestions do you have?
Standard galvanized C-shaped/U-shaped steel profiles that meet design requirements should be purchased instead of cold-rolled coils for further processing. Uncoiling, forming, and galvanizing the steel yourself is neither practical nor cost-effective for a single project.