Galvalume Steel Plate (GL), also known as Aluzinc Steel Plate, is coated with a 55% aluminum, 43.5% zinc, and 1.5% silicon alloy, providing:
Superior corrosion resistance (2–3× HDG)
Excellent heat reflectivity
Strong oxidation resistance
Longer outdoor service life
Smooth, bright metallic appearance
GL steel plate is widely used in roofing systems, building panels, HVAC ducts, automotive components, and industrial equipment.
🟪 Product Specifications
Thickness: 0.3 – 3.0 mm
Width: 600 – 1500 mm
Length: Custom lengths available
Al‑Zn Coating (GL):
AZ50 / AZ70 / AZ100 / AZ150 / AZ185
Standards:
ASTM A792
JIS G3321
EN 10346
Surface Types:
Regular Spangle
Zero Spangle
Surface Treatment:
Chromated
Oiled
Dry
Anti‑fingerprint
🟪 Key Features
2–3× corrosion resistance of HDG
Excellent heat reflectivity
Strong oxidation resistance
Smooth and attractive metallic appearance
Good formability and weldability
Long service life in outdoor environments
🟪 Included Grades
Commercial Grades
SGLC / SGLCC / SGLCD
Structural Grades
SGLC490 / SGLC590
🟪 Mechanical Properties (Typical)
Grade
Yield Strength
Tensile Strength
Elongation
Notes
SGLCC
≥140 MPa
270–410 MPa
≥22%
Standard GL steel
SGLC490
≥490 MPa
550–650 MPa
≥16%
High‑strength
🟪 Chemical Composition (Typical)
Element
Content (%)
C
≤0.12
Mn
≤0.60
Si
≤0.50
P
≤0.10
S
≤0.045
🟪 Physical Properties (General)
Density: 7.85 g/cm³
Corrosion Resistance: Very high
Heat Reflectivity: Excellent
Service Life: 20–40 years depending on coating
Surface Smoothness: High
🟪 Applications
Roofing and wall panels
HVAC ducts and ventilation systems
Automotive parts
Electrical cabinets and appliances
Agricultural equipment
Industrial fabrication
Outdoor structures and enclosures
🟪 Why Use It
Galvalume steel plate provides superior corrosion resistance, excellent heat reflectivity, and long‑term durability, making it ideal for roofing, construction, and industrial applications where HDG steel is not sufficient.
