S350GD Steel Roll Forming Material Guide: Coil Sizes, Properties & Applications

S350GD Steel Roll Forming Material

1. Overview of S350GD Steel in Roll Forming

S350GD is a high-strength structural steel grade defined under EN 10346, commonly supplied in galvanized form. It offers a minimum yield strength of 350 MPa, making it ideal for structural and roll formed applications.

In roll forming, S350GD is widely used for purlins, roofing profiles, wall cladding systems, framing components, and structural sections. It provides a balance between strength, formability, and cost.

Compared to standard structural steels like S235 or S275, S350GD allows thinner material to be used while maintaining structural performance.

2. Material Composition & Structure

S350GD consists of:

Iron base metal
Carbon (low content for formability)
Manganese
Micro-alloying elements (for strength)

Structure

Fine grain steel structure
Designed for cold forming
Supplied as coated or uncoated

3. Available Coil Specifications

Thickness Range

0.5mm – 3.0mm

Coil Width

600mm – 1500mm

Coil Weight

3 tons – 10 tons

Coil ID / OD

ID: 508mm / 610mm
OD: up to 1600mm

Tolerance

Tight thickness control
Excellent flatness

4. Mechanical Properties

Typical values:

Yield Strength: ≥350 MPa
Tensile Strength: 420 – 550 MPa
Elongation: 16% – 22%
Hardness: 120 – 180 HB

5. Coating Types (VERY IMPORTANT FOR SEO)

S350GD is commonly supplied with:

Z (Zinc coating) → Z100, Z180, Z275, Z450
AZ (Aluzinc coating) → AZ100, AZ150
Painted (PPGI / PPGL)

Coating Thickness:

100–600 g/m² depending on application

6. Surface Finishes

Mill finish
Galvanized (spangle / zero spangle)
Aluzinc
Painted (color coated)

7. Common Roll Forming Applications

C and Z purlins
Roofing panels
Wall cladding systems
Steel framing
Decking profiles
Structural channels

8. Advantages of S350GD Steel

High yield strength
Good formability
Widely available globally
Excellent for roll forming
Compatible with coatings
Cost-effective structural material

9. Disadvantages / Limitations

Springback during forming
Requires proper tooling setup
Corrosion risk if uncoated
Not suitable for extreme forming shapes
Moderate ductility

10. Roll Forming Machine Considerations

Roll Tooling

Hardened rollers required
Additional forming passes may be needed

Speed

10–40 m/min

Lubrication

Optional depending on coating

Cutting

Hydraulic shear or flying shear

Common Issues

Springback
Coating damage
Edge cracking

11. Common Problems in Production

Springback affecting profile accuracy
Coating damage (especially PPGI)
Edge cracking in tight bends
Tool wear
Length accuracy issues

12. Pricing Guide

Typical global pricing:

Low: $700–$900 per ton
Medium: $900–$1200 per ton
High: $1200–$1600+ per ton

Factors affecting price:

Coating type (Z, AZ, painted)
Thickness
Origin
Market demand

13. Comparison with Other Materials

S350GD vs S250GD

S350GD = stronger
S250GD = easier to form

S350GD vs HSLA

S350GD = standardized grade
HSLA = broader category

S350GD vs Aluminum

Steel = stronger
Aluminum = lighter

14. Best Industries Using S350GD Steel

Construction
Steel building manufacturing
Roofing and cladding
Industrial fabrication
Agricultural buildings

15. How to Choose S350GD Steel

Choose S350GD When:

Structural strength required
Roofing or cladding systems
Purlins and framing
Cost-performance balance needed

Avoid When:

Complex shapes required
Extremely high strength needed (use AHSS)

16. FAQ Section

What is S350GD steel?

A high-strength structural steel grade used in roll forming.

Is S350GD galvanized?

Often supplied galvanized (Z coating).

What does 350 mean?

Minimum yield strength of 350 MPa.

Is S350GD good for purlins?

Yes, one of the most common materials.

Can S350GD be painted?

Yes, commonly used as PPGI/PPGL.

17. Machine Matcher Section

We supply roll forming machines for all material types including S350GD 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
0.5–3.0mm

Yield Strength
≥350 MPa

Coil Width
600–1500mm

Coil ID
508 / 610mm