1.What are the applications of galvanized coils in building envelope systems?
Roofing Systems
Main Applications: Roofs for large buildings such as industrial plants, warehouses, gymnasiums, and shopping malls.
Applications: Galvanized coils are typically not used directly, but rather as a substrate for color-coated steel sheets. This involves coating the galvanized coils with various colored coatings (such as PVC and PVDF) to create a more weather-resistant and aesthetically pleasing color-coated coil. The resulting coated coils are then processed into corrugated steel sheets or sandwich panels.
Advantages: Lightweight, high strength, quick installation, excellent waterproofing, and long service life.
Wall Systems
Main Applications: Exterior and interior wall panels for buildings.
Applications: Also often processed into wall panels in the form of color-coated steel sheets. For buildings requiring thermal insulation, sandwich panels with galvanized coils as the surface layer (filled with insulating materials such as polyurethane and rock wool) are often used.
Advantages: They contribute to the building's exterior while also providing thermal insulation, heat insulation, and fire protection.
2.What are the applications of galvanized coils in the main structural system of buildings?
Lightweight Steel Structural Components
Main Applications: In steel structures, structural components manufactured from galvanized coils using a cold-formed process are extensively used.
Specific Components:
Purlins: Secondary structural components connecting the primary structure (steel beams) to the roof/wall panels, making them one of the most widely used structural components.
Wall Beams: Similar to purlins, these components are used in wall surfaces.
C-/Z-Sections: Steel with C- or Z-shaped cross-sections manufactured using a cold-formed machine, used as purlins, wall beams, or lightweight frames.
Advantages: Factory-produced, high precision; excellent corrosion resistance; no on-site painting required, shortening construction time.
Auxiliary Structures and Connectors
Specific Components: Various supports, tie rods, brackets, connecting plates, etc. Galvanizing these small components ensures the durability of the entire structural system.
3.What are the applications of galvanized coils in building auxiliary facilities and interior decoration?
Floor Decking (Steel Decking)
Application: In multi-story steel structures, galvanized steel coils are formed into a permanent formwork, upon which concrete is poured. They serve both as formwork during construction and as the structural reinforcement for the floor slab during operation.
Advantages: Fast construction, reduced use of wooden formwork, and high structural strength.
Ventilation Ducts
Application: Central air conditioning supply and exhaust systems in buildings. Galvanized steel coils are the primary material for ventilation ducts.
Advantages: Corrosion resistance, easy processing, low cost, and long service life.
Gutter and Downspout Systems
Application: Systems for collecting and draining rainwater from roofs.
Advantages: Resistant to rainwater corrosion and well-matched with roofing materials.
Interior Components
Application: Lightweight steel frame partitions, suspended ceiling systems, etc. Galvanized lightweight steel frame is a popular alternative to wooden frame, offering fire resistance, moisture resistance, and excellent deformation resistance.
4.What types of galvanized coils are commonly used for roofing/walling?
Hot-dip galvanized coil (GI) typically has a spangled or no spangled surface. Key requirements: a smooth surface for easy painting and long-lasting corrosion resistance.
5.What are the types of galvanized coils commonly used for structural parts (purlins, C-shaped steel)?
Hot-dip galvanized coil (GI), high-strength steel
Core requirements: High strength (yield strength) and zinc layer thickness (e.g., Z180 and above)