Galvalume Steel Roll Forming Material Guide: Aluzinc Coating, Coil Sizes & Applications

Galvalume Steel Roll Forming Material

1. Overview of Galvalume Steel in Roll Forming

Galvalume steel (also known as Aluzinc steel) is a coated steel material consisting of an aluminum-zinc alloy coating applied to a steel substrate. The typical coating composition is 55% aluminum, 43.4% zinc, and 1.6% silicon.

In roll forming, Galvalume is widely used for roofing, wall cladding, and structural applications due to its superior corrosion resistance compared to standard galvanized steel (GI). It performs particularly well in outdoor environments, offering long service life and excellent heat reflectivity.

Galvalume is one of the most popular materials globally for metal roofing systems and is often used as the base material for painted products (PPGL).

2. Material Composition & Structure

Galvalume steel consists of:

Steel base (cold rolled steel)
Aluminum-zinc alloy coating

Coating Composition:

55% Aluminum
43.4% Zinc
1.6% Silicon

Layer Structure:

Steel core
Aluminum-zinc alloy coating
Protective oxide layer (forms naturally)

3. Available Coil Specifications

Thickness Range

0.3mm – 3.0mm

Coil Width

600mm – 1250mm (up to 1500mm available)

Coil Weight

3 tons – 12 tons

Coil ID / OD

ID: 508mm / 610mm
OD: up to 1500mm

Tolerance

Tight thickness control
Excellent flatness for roll forming

4. Mechanical Properties

Typical values:

Yield Strength: 230 – 550 MPa
Tensile Strength: 300 – 700 MPa
Elongation: 15% – 30%
Hardness: 120 – 200 HB

Common grades:

AZ50 / AZ150 coating grades
Structural grades (S320GD / S350GD)

5. Coating Types

Aluzinc Coating (AZ)

AZ50 (light coating)
AZ100
AZ150 (most common)

Coating Thickness

AZ150 ≈ 20–25 microns

Lifespan

Indoor: 30+ years
Outdoor: 20–40+ years

Cost Level

Medium

6. Surface Finishes

Smooth metallic finish
Fine spangle appearance
Matte or reflective surface
Suitable for painting (PPGL base)

7. Common Roll Forming Applications

Galvalume steel is used in:

Roofing panels (standing seam, trapezoidal, corrugated)
Wall cladding systems
Industrial buildings
Agricultural structures
Gutters and downpipes
Structural panels
Solar mounting structures

8. Advantages of Galvalume Steel

Superior corrosion resistance vs galvanized steel
Excellent heat reflectivity
Longer lifespan in outdoor environments
Lightweight and strong
Ideal for roofing applications

9. Disadvantages / Limitations

Higher cost than standard GI
Not ideal for coastal environments with salt exposure (without coating)
Can crack in tight bends
Requires proper handling to avoid surface damage

10. Roll Forming Machine Considerations

Roll Tooling

Chrome plated rollers recommended
Smooth finish to avoid coating damage

Speed

15–60 m/min

Lubrication

Usually not required

Cutting

Hydraulic or flying shear
Clean cutting to prevent edge damage

Common Issues

Edge cracking in tight bends
Surface scratches
Coating damage from worn rollers

11. Common Problems in Production

Edge corrosion if cut edges exposed
Surface scratches affecting appearance
Oil canning in roofing panels
Coil camber affecting alignment
Handling damage before forming

12. Pricing Guide

Typical global pricing:

Low: $900–$1100 per ton
Medium: $1100–$1400 per ton
High: $1400–$1800+ per ton

Factors affecting price:

Coating level (AZ50, AZ150)
Thickness
Steel grade
Supplier and origin

13. Comparison with Other Materials

Galvalume vs Galvanized Steel (GI)

Galvalume = better corrosion resistance
GI = cheaper

Galvalume vs Aluminum

Galvalume = stronger
Aluminum = lighter and more corrosion resistant

Galvalume vs PPGL

Galvalume = base material
PPGL = painted version

14. Best Industries Using Galvalume Steel

Construction and roofing
Industrial buildings
Agriculture
Solar energy
Infrastructure

15. How to Choose Galvalume Steel

Choose Galvalume When:

Roofing applications
Outdoor environments
Long lifespan required
Heat reflectivity is important

Avoid When:

Coastal/marine environments without coating
Tight forming profiles
Budget is very limited

16. FAQ Section

What is Galvalume steel?

It is steel coated with an aluminum-zinc alloy.

Is Galvalume better than galvanized steel?

Yes, for corrosion resistance in most environments.

What is AZ150?

It is a coating weight of 150 g/m².

Is Galvalume good for roofing?

Yes, it is one of the best roofing materials.

Can Galvalume be painted?

Yes, it is used as the base for PPGL.

17. Machine Matcher Section

We supply roll forming machines for all material types including Galvalume steel.

Custom-built machines to your profile
New machines built to specification
Global delivery available
UK and USA technical support

Contact:
Machine Matcher
Sales & Technical Team

Quick Specs

Thickness
0.3–3.0mm

Yield Strength
230–550 MPa

Coil Width
600–1250mm

Coil ID
508 / 610mm