🟧 Product Overview

Galvalume steel coil (GL), also known as Alu‑Zinc coated steel or AZ steel, is produced by coating cold‑rolled steel with a 55% Aluminum, 43.5% Zinc, 1.5% Silicon alloy.

Compared with hot‑dip galvanized steel (HDG), Galvalume offers:

• 2–6× higher corrosion resistance
• Superior heat resistance
• Better surface reflectivity
• Longer service life in coastal and industrial environments

Galvalume is widely used in roofing, wall cladding, structural components, and outdoor applications requiring long‑term durability.

🟧 International Standards

ASTM A792（USA）

• AZ50 / AZ55 / AZ70 / AZ100 / AZ150 / AZ185

JIS G3321（Japan）

• SGLCC – Commercial quality
• SGLCD – Drawing quality
• SGLC – Deep drawing

EN 10346（Europe）

• DX51D+AZ
• DX52D+AZ
• DX53D+AZ

🟧 Global Alu‑Zinc Coating Matrix

Coating	Coating Mass (g/m²)	Typical Use
AZ50	50 g/m²	Indoor, light duty
AZ70	70 g/m²	General construction
AZ100	100 g/m²	Roofing, wall panels
AZ150	150 g/m²	High‑corrosion outdoor
AZ185	185 g/m²	Coastal, industrial, long‑life roofing

🟧 Base Steel Grade Matrix

Standard	Grade	Description	Formability
JIS G3321	SGLCC	Commercial quality	★★★
JIS G3321	SGLCD	Drawing quality	★★★★
JIS G3321	SGLC	Deep drawing	★★★★★
EN 10346	DX51D+AZ	General forming	★★★
EN 10346	DX52D+AZ	Drawing quality	★★★★
EN 10346	DX53D+AZ	Deep drawing	★★★★★

🟧 Galvalume Coating Structure (55% Al‑Zn Alloy)

The coating consists of:

• Aluminum-rich layer – provides long‑term corrosion resistance
• Zinc-rich layer – offers sacrificial protection
• Silicon – improves adhesion and coating stability

This unique alloy structure gives Galvalume:

• 2–6× the corrosion resistance of HDG
• Excellent heat reflectivity
• Superior durability in coastal environments

🟧 Product Specifications

Dimensions

• Thickness: 0.12 – 2.0 mm
• Width: 600 – 1500 mm
• Coil ID: 508 / 610 mm
• Coil Weight: 3 – 10 MT

Surface Finishes

• Regular spangle
• Zero spangle
• Anti‑finger coating (AFC)
• Chromated / Non‑chromated
• Oiled / Dry
• Skin‑passed

🟧 Mechanical Properties (typical)

Grade	Yield Strength	Tensile Strength	Elongation
SGLCC	140–300 MPa	270–500 MPa	≥ 22%
SGLCD	120–260 MPa	260–420 MPa	≥ 26%
SGLC	110–220 MPa	260–380 MPa	≥ 30%

🟧 GL vs. HDG vs. EG (Flagship Comparison)

Property	Galvalume (GL)	Galvanized (HDG)	Electro‑Galvanized (EG)
Corrosion Resistance	★★★★★	★★★★	★★★
Heat Resistance	★★★★★	★★★	★★★
Surface Appearance	★★★★	★★★	★★★★★
Paintability	★★★★	★★★★	★★★★★
Best Use	Coastal, roofing	Structural, general	Automotive, appliances

🟧 Applications

Construction

• Roofing sheets
• Wall cladding
• Corrugated panels
• Structural components

Industrial

• HVAC equipment
• Electrical enclosures
• Machinery housings

Home Appliances

• Refrigerator panels
• Microwave housings
• Washing machine bodies

Outdoor

• Fencing
• Carports
• Agricultural buildings

🟧 Why Choose Galvalume Steel Coil

• 2–6× corrosion resistance vs. galvanized steel
• Excellent heat and weather resistance
• Long service life in coastal environments
• Superior reflectivity and energy efficiency
• Ideal for roofing and outdoor structures

🟧 Why Choose WelSteels

• Full range of AZ coatings (AZ50–AZ185)
• Stable mechanical and surface quality
• Advanced Alu‑Zinc coating lines
• SGS / BV inspection available
• Export‑grade seaworthy packaging
• Reliable delivery for global projects