Uses of galvanized coils

1. Building and structural engineering
Core requirements: atmospheric corrosion resistance, structural strength, economy
Typical applications:
Roof and wall materials:
Manufacture of color-coated steel plates (such as color steel tiles), building roof panels, and exterior wall decorative panels, using the zinc layer to resist rain and ultraviolet erosion and extend service life (common coating weight 60-275g/m²).
Steel structures and brackets:
Manufacture of steel structure purlins, light steel keels, photovoltaic brackets, and scaffolding, using the galvanized layer to prevent steel from rusting, especially suitable for humid areas (such as coastal buildings).
Ventilation ducts and drainage systems:
Manufacture of central air-conditioning ducts, rainwater pipes, and sewage pipes, using the anti-humidity and corrosion properties of the galvanized layer.
2. Automobile manufacturing and transportation industry
Core requirements: body corrosion protection, lightweight, and formability
Typical applications:
Body parts:
Manufacture of automobile chassis parts (such as crossbeams, longitudinal beams), door frames, and instrument panel brackets, using hot-dip galvanized coils (coating thickness 8-25μm) to prevent road salt water, rain and snow corrosion.
Automobile shell and interior:
Some low-end models or interior parts use electro-galvanized coils (smoother surface), such as door inner panels and fuel tank shells.
Traffic facilities:
Manufacturing highway guardrails, traffic signs, and light poles, reducing maintenance costs through the weather resistance of the galvanized layer.
3. Home appliances and consumer electronics
Core needs: beautiful surface, fingerprint resistance, and corrosion resistance
Typical applications:
White appliance shell:
The production of refrigerator back panels, washing machine inner drums, and air conditioner outer shells uses fingerprint-resistant galvanized coils (surface passivation treatment), which are both corrosion-resistant and easy to clean.
Kitchen appliances:
Manufacturing range hood panels and gas stove bases, the galvanized layer can resist oil fume erosion, and some products are covered with organic coatings to improve the appearance.
Electronic equipment brackets:
Such as computer cases and server cabinets, using the conductivity and structural strength of galvanized coils.
4. Industrial equipment and containers
Core requirements: acid and alkali corrosion resistance, sealing, strength
Typical applications:
Industrial pipelines and storage tanks:
Manufacturing liquid delivery pipelines and oil storage tanks in the chemical industry, using high coating weight galvanized coils (such as 275g/m²) to resist mildly corrosive media.
Agriculture and animal husbandry:
Manufacturing granaries, feed storage tanks, and breeding equipment (such as pig fences) to prevent rust in humid environments.
Mechanical parts:
Manufacturing motor housings, bearing end covers, and flanges, using galvanized layers to reduce the anti-corrosion treatment process after processing.
5. Packaging and container manufacturing
Core requirements: good toughness, moisture resistance, and low cost
Typical applications:
Metal packaging barrels:
Manufacturing food-grade galvanized iron barrels (such as milk powder and grease), industrial chemical barrels, the zinc layer can prevent the contents from getting wet or reacting with metal.
Cable trays:
Protect power cables from external mechanical damage and corrosion, and are widely used in building wiring systems.
2. Classification and performance differences of galvanized coils
Classification Type Features Typical uses
Galvanizing process Hot-dip galvanized coils Thick zinc layer (60-300g/m²), strong adhesion, excellent corrosion resistance, rough surface with zinc flowers Building structure, automobile chassis, outdoor facilities
Electro-galvanized coils Thin zinc layer (8-20g/m²), smooth and uniform surface, weak corrosion resistance but suitable for precision coating Home appliance housing, electronic components
Surface treatment Passivated galvanized coils The surface of the zinc layer is treated with chromate or chromium-free passivation to enhance corrosion resistance and coating adhesion Color-coated substrates, workpieces that require subsequent spraying
Fingerprint-resistant galvanized coils The surface is coated with an organic film to prevent fingerprint contamination and improve lubricity, which is convenient for stamping and forming Refrigerator panels, washing machine inner drums
Substrate type Cold-rolled galvanized coils The substrate has high precision and a smooth surface, suitable for complex forming and processing Auto parts, home appliance panels
Hot-rolled galvanized coils Low cost, high strength, but large surface roughness Large structural parts, industrial pipelines
III. Core advantages of galvanized coils
High-efficiency anti-corrosion:
The zinc layer uses the sacrificial anode protection principle (zinc is more active than iron and corrodes first). Even if the coating is damaged, it can delay the rusting of the substrate, and the service life is 5-10 times longer than that of bare steel.
High cost performance:
Compared with stainless steel, the cost of galvanized coils is 30%-50% lower, suitable for large-scale replacement of bare steel for medium-corrosion environments.
Flexible processing:
Secondary processing such as stamping, welding, and bending can be performed to meet the needs of various shapes (such as corrugated plates and C-shaped steel).
Environmental protection and energy saving:
The energy consumption of the galvanizing process is lower than that of stainless steel smelting, and waste galvanized coils can be 100% recycled and reused.
IV. Typical application cases
Case 1: Roof of high-rise residential buildings
Use hot-dip galvanized color-coated coils (coating 275g/m² + color coating), with a design life of more than 20 years and no frequent maintenance required.
Case 2: New energy vehicle battery pack
Cold-rolled galvanized coil (coating 12μm) is used to make the battery shell, which has passed the salt spray test for more than 1,000 hours and meets the requirements of waterproof and anti-corrosion.
Case 3: Supermarket shelves
Electro-galvanized coil (coating 8μm) is spray-coated to make shelves. The surface is beautiful and resistant to hand sweat corrosion, suitable for indoor storage environment.
Summary
Galvanized coil is a "universal anti-corrosion material" in the industrial field. Its core value lies in the significant improvement of steel corrosion resistance at low cost, which is widely used in construction, automobiles, home appliances and other livelihood and industrial scenes. With the popularization of environmental protection technologies such as chromium-free passivation and high weather-resistant coating, galvanized coil is moving towards more environmentally friendly, higher performance and more refined application, and continues to support the basic material needs of various industries.
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