Fluorocarbon Coating (PVDF)

Polyester Coating (PE)

Silicon-Modified Polyester (SMP)

High-Durability Polyester (HDP)

Outdoor Weathering Life

15-20 years

5-10 years

10-15 years

10-15 years

UV Resistance

Extremely strong (almost no chalking)

Moderate (prone to chalking)

Relatively strong (slow chalking)

Relatively strong (slower chalking)

Salt Spray Resistance

>5000 hours (no corrosion)

1000-2000 hours

2000-3000 hours

2000-3000 hours

Cost

High (about 2-3 times that of PE)

Low

Medium (about 1.5 times that of PE)

Medium (about 1.2-1.5 times that of PE)

Flexibility

Moderate (hard coating)

Good

Good

Good

Applicable Scenarios

High corrosion resistance requirements (e.g., curtain walls in coastal areas, building facades in heavily polluted industrial areas)

Indoor or mild outdoor climates (e.g., home appliance casings, indoor decorative components)

General outdoor (e.g., non-coastal areas, such as warehouse and commercial building walls/roofs)

General outdoor environments (e.g., industrial factory walls, ordinary building roofs)

Specification Parameters

- Thickness: 0.1-2.0mm- Width: 600-1500mm- Length: Customizable (coiled or flat)- Yield strength: 235-345MPa- Tensile strength: 375-500MPa- Density: 7.85g/cm³

- Thickness: 0.1-2.0mm- Width: 600-1500mm- Length: Customizable (coiled or flat)- Yield strength: 235-345MPa- Tensile strength: 375-500MPa- Zinc coating thickness: 80-275g/m² (hot-dip galvanizing)- Density: 7.85g/cm³

- Thickness: 0.1-2.0mm- Width: 600-1500mm- Length: Customizable (coiled or flat)- Yield strength: 235-345MPa- Tensile strength: 350-500MPa- Coating: 55%Al-43.4%Zn-1.6%Si alloy, thickness 50-150g/m²- Density: 7.85g/cm³

Material

Low-carbon steel (e.g., SPCC, DC01/03) with carbon content ≤0.25%, no coating, and smooth surface

Low-carbon steel substrate (same as cold-rolled steel plates) + zinc coating (hot-dip or electro-galvanized), where the zinc layer provides rust resistance

Low-carbon steel substrate + zinc-aluminum alloy coating (55% aluminum, 43.4% zinc, 1.6% silicon) with stronger coating adhesion

Uses

Stamped parts (e.g., auto parts, home appliance casings), structural supports, mechanical components, decorative parts, etc.

Automobile bodies, building envelopes (e.g., light steel keels), home appliances (refrigerators, washing machines), ventilation ducts, outdoor brackets, etc.

High-weather-resistance building roofs/walls, chemical equipment enclosures, containers, coastal area components, solar brackets, etc.

Application Scenarios

Indoor dry environments (e.g., workshop equipment, furniture frames), avoiding moisture (prone to rusting)

Humid environments (e.g., kitchen equipment, bathroom hardware), moderately corrosive environments (e.g., urban building exteriors)

Highly corrosive environments (coastal areas, industrial zones, chemical zones), long-term outdoor exposure scenarios (e.g., highway guardrails, grain silos)

Style

Flat plates, coiled plates; surfaces can be pickled or phosphated (no coating)

Flat plates, coiled plates; surfaces can have zinc flowers (hot-dip galvanizing) or no zinc flowers (electro-galvanizing); some can be pre-treated for color coating

Flat plates, coiled plates; silver-gray surface with uniform coating, usable directly or for color coating

Production Process Flow

Hot-rolled steel plates → cold rolling (thickness reduction) → annealing (stress relief) → temper rolling (precision adjustment) → shearing/coiling

Cold-rolled steel plates → degreasing and cleaning → hot-dip galvanizing (or electro-galvanizing) → cooling → passivation (anti-white rust) → shearing/coiling

Cold-rolled steel plates → degreasing and cleaning → hot-dip zinc-aluminum alloy (molten coating) → cooling → passivation → shearing/coiling

Quality Control

- Dimensional tolerance: Thickness deviation ≤±0.02mm, width deviation ≤±1mm- Surface quality: No cracks, pitting, or scale- Mechanical properties: Tensile test (yield/tensile strength)

- Zinc coating thickness: Hot-dip galvanizing ≥80g/m² (single side), electro-galvanizing ≥10g/m²- Adhesion: No coating peeling in bending test- Corrosion resistance: Salt spray test ≥48 hours without red rust

- Coating composition: Al 55%±2%, Zn 43.4%±2%- Coating thickness: ≥50g/m² (single side)- Corrosion resistance: Salt spray test ≥500 hours without red rust