Hot Dipped Galvanized
0.40 - 1.0 mm thick5 - 1500 mm wide
S260GD to S550GD Structural Galvanized Steel Strip
Structural galvanized strip, zinc 30 to 350 g/m2, 0.40 to 1.0 mm, slit 5 to 1500 mm.
Overview
What This Grade Range Is For
The GD grades are specified by minimum yield strength, which is what a roll formed structural section is actually designed around. S260GD suits general sections; S550GD lets a purlin or stud carry its load in noticeably thinner material. The zinc comes from the same 30 to 350 gram per square metre range as the forming grades, so structural performance and corrosion life are chosen separately. Gauge runs 0.40 mm to 1.0 mm.
Specifications
| Quality Designation | Construction steel S260GD - S550GD |
| Temper | Annealed |
| Zinc Weight | 30 - 350 gram/m2 |
| Thickness | 0.40 - 1.0 mm |
| Width | 5 - 1500 mm |
Ranges as supplied. Exact grade within the range is confirmed against your application.
Key Benefits
- Yield strength is the specified property, so section design has a number to work from
- Higher grades allow thinner sections and lower shipped weight
- Galvanized and structural in a single product, with no separate coating operation
- Coating weight independent of grade across the full 30 to 350 gram per square metre range
Problems It Solves
- A section is designed in mild steel and then painted, adding a process and a failure point
- Thickness is driven by load rather than by function, pushing up weight and freight
- The required strength grade is available only in widths far beyond the section needed
Who It Is For
- Roll formers producing building framing components
- Racking and storage system manufacturers
- Steel building component suppliers
Application Scenarios
- Roll formed purlins, studs and track
- Light steel framing components
- Racking and shelving uprights
- Structural trays and decking profiles
Technical Features
- Grade designation states minimum yield strength in megapascals, from 260 to 550
- Supplied annealed with a hot dip zinc coating
- Formability decreases as the grade rises, so roll forming setups need review on a grade change
Manufacturing Process
How This Material Reaches You
Cold rolling to gauge
Continuous hot dip galvanizing
Skin passing
Slitting to the section developed width
Recoiling and packing
Materials
- Hot dipped galvanized structural steel, grades S260GD to S550GD
Quality Control
- Yield strength confirmed against the ordered grade
- Coating weight verified before release
- Slit width held to the developed width the roll former needs
Customization Options
- Grade selected against the calculated section load
- Slit width matched to the developed width of the profile
- Coating weight set by the exposure class of the building element
Comparison
How It Compares With The Alternatives
| Compared With | What Changes |
|---|---|
| DX51D to DX56D Galvanized Strip | Same zinc, different steel. DX grades are chosen for forming behaviour; GD grades are chosen for a stated yield strength. |
| HSLA 260 to 550 Cold Rolled Strip | Comparable strength range without the coating. HSLA suits enclosed or separately finished parts; GD suits anything exposed. |
Use Guide
Getting The Specification Right First Time
- Design the section against the grade minimum yield, not against a nominal mild steel figure
- Re-check roll forming setup when the grade changes, because springback moves with strength
- Order the slit width to the developed width of the profile so nothing is trimmed later
- Choose the coating weight from the exposure class of the finished building element
What to Include in Your Enquiry
- The part and how it is formed, including the tightest bend radius
- The service environment and expected design life
- The strip width your die or roll former actually needs
- Coil inner diameter and maximum coil weight your decoiler accepts
S260GD to S550GD Structural Galvanized Steel Strip Questions
What does GD mean in S350GD?
S is structural, 350 is the minimum yield strength in megapascals, and GD denotes the hot dip galvanized condition.
Can I get structural grades thinner than 0.40 mm?
Not in this family. Below 0.40 mm the DX forming grades cover down to 0.15 mm, but they are not specified on yield strength.
Does a higher grade need a different zinc coating?
No. The 30 to 350 gram per square metre range applies across all the GD grades, so the two decisions stay independent.
Is S550GD formable?
It roll forms, but it is considerably less ductile than S260GD. Bend radii need opening up and springback compensation increases.
Related Materials
DX51D to DX56D Hot Dipped Galvanized Steel Strip
Forming grade galvanized strip, zinc 30 to 350 g/m2, 0.15 to 1.0 mm, slit 5 to 1500 mm.
View Specification
HSLA 260 to 550 Cold Rolled Steel Strip
High strength low alloy strip from 260 to 550, annealed, 0.40 to 1.0 mm, slit 5 to 1500 mm.
View Specification
Get a Quote on Hot Dipped Galvanized
Send the specification or just the part drawing. We will confirm what is achievable in gauge, width and temper before anything is priced.