Galvanized Steel Coils (GI)

Steel Grade / Base Metal Type
Structural Quality (SQ)
Drawing Quality (DQ)
Extra Deep Drawing Quality (EDDQ)
Common grades: DX51D, DX52D, DX53D, DX54D (According to European Standard EN 10346)

Substrate Thickness
Commonly used range: 0.3mm ~ 1.5mm

Substrate Width
Conventional Range: 600mm ~ 1250mm
Can be customized according to customer requirements.

Coating Type
Hot-Dip Galvanized (GI): Pure zinc coating, provides cathodic protection.
Galvalume (GL): Coating composition: ~55% Al, 43.4% Zn, 1.6% Si. Better corrosion resistance than GI.

Coating Weight/Thickness - Core Parameter
Unit: g/m² (Total both sides)

Common designations:
Z60 | Z100 | Z120 | Z150 | Z180 | Z225
e.g., Z120 indicates a total coating mass of 120 g/m², typically about 60 g/m² per side.
Conversion: Approximately 50 g/m² (total both sides) ≈ 7.1 µm (total coating thickness).

Surface Treatment
Chromate Passivation (C): Standard treatment, provides basic anti-rust capability.
Chromium-Free Passivation (F): Environmentally friendly treatment.
Oiling (O): Provides short-term rust prevention and lubrication.
Anti-Fingerprint (AF): Used in appliances, improves surface appearance and stain resistance.

Surface Finish
Regular Spangle (R)
Minimal Spangle (M)
Spangle-Free (F): Typically used for subsequent painting.
Skin-Passed (S): Smoother surface, suitable for deep drawing or painting.

Yield Strength (YS)
Unit: MPa
Range: 140 MPa ~ 500 MPa+ (Depends on steel grade)

Tensile Strength (TS)
Unit: MPa
Range: 270 MPa ~ 600 MPa+ (Depends on steel grade)

Elongation (El)
Unit: %
Measures the ductility of the material.
CQ: Typically > 20%
DQ/EDDQ: Typically > 28%