Regular Spangle Galvanized Steel Roll Forming Material Guide: Surface Finish, Coil Specs & Uses

Regular Spangle Galvanized Steel Roll Forming Material

1. Overview of Regular Spangle Galvanized Steel in Roll Forming

Regular spangle galvanized steel is the most traditional and widely used galvanized steel finish, characterized by its visible zinc crystal pattern (spangle) formed during the cooling process after hot dip galvanizing.

In roll forming, regular spangle steel is used extensively in construction, roofing, cladding, and general fabrication where appearance is less critical or where the spangle pattern is acceptable or even preferred.

It is available across all coating levels (Z100 to Z600), with Z275 being the most common. This material offers a strong balance of corrosion resistance, cost, and availability, making it one of the most widely used materials globally.

2. Material Composition & Structure

Regular spangle galvanized steel consists of:

• Steel base (cold rolled steel)
• Zinc coating (varies depending on grade)

Layer Structure:

1. Steel core
2. Iron-zinc alloy bonding layer
3. Zinc coating (with visible crystal pattern)

Surface Characteristic:

• Visible spangle (crystal pattern)
• Natural zinc finish
• Varies in size depending on process control

3. Available Coil Specifications

Thickness Range

• 0.3mm – 4.5mm

Coil Width

• 600mm – 1500mm

Coil Weight

• 3 tons – 20 tons

Coil ID / OD

• ID: 508mm / 610mm
• OD: up to 1800mm

Tolerance

• Thickness tolerance: ±0.02–0.05mm
• Good flatness for roll forming

4. Mechanical Properties

Typical values:

• Yield Strength: 250 – 550 MPa
• Tensile Strength: 350 – 700 MPa
• Elongation: 15% – 30%
• Hardness: 120 – 200 HB

Grades:

• DX51D (forming grade)
• S320GD / S350GD (structural grades)

5. Coating Types

Regular spangle can be applied to:

• Z100
• Z180
• Z275
• Z450
• Z600

Coating Thickness

• Depends on coating weight
• Example: Z275 ≈ 19–20 microns

Lifespan

• Based on coating level used

Cost Level

• Lowest among galvanized finishes

6. Surface Finishes

• Regular spangle (visible pattern)
• Large spangle (older process)
• Controlled spangle (modern processes)

7. Common Roll Forming Applications

Regular spangle galvanized steel is used in:

• Roofing sheets (corrugated, trapezoidal)
• Wall cladding panels
• Agricultural buildings
• C and Z purlins
• Fencing systems
• Structural components
• General fabrication

8. Advantages of Regular Spangle Galvanized Steel

• Most cost-effective galvanized option
• Widely available globally
• Good corrosion resistance
• Proven performance in construction
• Easy to source in all grades

9. Disadvantages / Limitations

• Visible pattern not suitable for architectural finishes
• Poor paint adhesion compared to zero spangle
• Inconsistent appearance between coils
• Less suitable for high-end applications

10. Roll Forming Machine Considerations

Roll Tooling

• Standard chrome plated rollers
• Less sensitive to minor surface defects

Speed

• 20–60 m/min

Lubrication

• Typically not required

Cutting

• Hydraulic or flying shear
• Standard blade setup

Common Issues

• Surface marking less noticeable
• Zinc cracking in tight bends
• Coil variation affecting finish

11. Common Problems in Production

• White rust due to poor storage
• Surface inconsistency between batches
• Spangle variation affecting appearance
• Edge corrosion over time
• Coil camber affecting alignment

12. Pricing Guide

Typical global pricing:

• Low: $750–$950 per ton
• Medium: $950–$1200 per ton
• High: $1200–$1600+ per ton

Factors affecting price:

• Coating weight
• Steel grade
• Coil thickness
• Supplier

13. Comparison with Other Materials

Regular Spangle vs Zero Spangle

• Regular = visible pattern
• Zero = smooth finish

Regular Spangle vs Minimized Spangle

• Regular = larger visible crystals
• Minimized = reduced pattern

Regular Spangle vs PPGI

• Regular = base material
• PPGI = painted finish

14. Best Industries Using Regular Spangle Steel

• Construction and roofing
• Agriculture
• Industrial buildings
• Infrastructure
• General fabrication

15. How to Choose Regular Spangle Galvanized Steel

Choose Regular Spangle When:

• Cost is a priority
• Appearance is not critical
• Standard construction applications
• Large volume production

Avoid When:

• Architectural finishes required
• Painting or coating required
• High-end visual applications

16. FAQ Section

What is regular spangle galvanized steel?

It is galvanized steel with a visible zinc crystal pattern.

Is it cheaper than zero spangle?

Yes, it is typically cheaper.

Can it be painted?

Yes, but surface preparation is required.

Is it suitable for roofing?

Yes, it is widely used for roofing.

Does spangle affect performance?

No, it mainly affects appearance.

17. Machine Matcher Section

We supply roll forming machines for all material types including regular spangle galvanized 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
0.3–4.5mm

Yield Strength
250–550 MPa

Coil Width
600–1500mm

Coil ID
508 / 610mm