Galvanized Steel Strip
Narrow zinc coated strip slit to your width from full width galvanized master coil
Specifications
GI/PPGI Steel Coil
Color Coated Galvanized Steel Coil PPGI
Color finished galvanized coil that leaves the roll former ready to install
Pre-painted galvanized steel coil is galvanized base coil that carries its paint finish from the coil line rather than from a spray booth after fabrication. It is specified by roll formers, panel makers and appliance manufacturers who want the zinc layer and the color coat settled before the strip reaches their line. Painting at coil stage removes the masking, handling and touch-up that follow painting a formed part, and it makes the finish repeatable from one delivery to the next instead of varying with booth conditions. Base grades run from SGCC and DX51D through Q195 to Q345B and G250 to G550, with zinc coating from G20 to Z350 applied hot-dipped or by the electro route.
- Product Name — Pre-Painted Galvanized Steel Coil
- Also Known As — PPGI color coated galvanized steel coil
- Material — G250 G350 G450 G550 A36 SS400 S275 S235 Q195 Q215 Q235B Q345B SGCC DX51D
- Zinc Coating — G20 G30 G40 G60 G90 Z40 Z60 Z80 Z100 Z120 Z150 Z275 Z350
- Galvanizing Technology — Hot-dipped or electro
Why It Is Specified
Key Benefits of Pre-Painted Galvanized Steel Coil
Paint Applied Before Forming Not After
The color coat is on the strip when it arrives, so panels come off the roll former finished. There is no spray booth stage between fabrication and dispatch.
Two Galvanizing Routes From One Supply
Zinc can be applied hot-dipped or electro. Hot-dipped suits heavier coating mass for exposure while electro suits a smoother base where the paint finish is the visible surface.
Zinc Coating Mass Chosen for the Exposure
Coating runs from G20 and Z40 up to Z275 and Z350, so an indoor panel and an exterior wall sheet can be specified from the same product without overpaying on zinc.
Structural and Drawing Grades in One Range
The base covers drawing grades such as SGCC and DX51D and structural grades such as Q235B, Q345B, S275, S235 and G550, so a forming job and a load bearing profile can come from the same order.
Consistent Color Across Deliveries
A coil coated finish repeats from batch to batch, which matters when a building is clad in stages or a replacement panel has to sit next to one installed a year earlier.
Less Waste Handling at the Fabricator
No paint booth means no solvent handling, no drying racks and no rejects from dust in wet paint on your own shop floor.
Problems It Solves
What This Material Removes From Your Process
Paint Failing on Fabricated Parts
Painting after forming leaves thin coverage on bends and edges where the coating is worked hardest. A coil coated finish is applied flat and carried through the form.
Color Drifting Between Production Batches
Booth painted parts vary with temperature, humidity and operator. Coil coating gives a finish that repeats, so panels installed months apart still match.
Finishing Steps Blocking the Fabrication Line
A paint and dry cycle between forming and packing sets the pace of the whole shop. Pre-painted coil takes that stage out of the sequence.
Corrosion Under the Paint on Bare Steel
Paint on bare steel fails from underneath once moisture reaches the substrate. The zinc layer under the color coat stays as the corrosion barrier if the paint is scratched.
Mixed Grade Callouts Across a Project
Drawing grades and structural grades on the same job usually mean two suppliers. SGCC, DX51D, Q195 to Q345B, S235, S275 and G250 to G550 come from the same coil range.
Application Scenarios
Where It Is Used
Roof and Wall Cladding Panels
Roll formed exterior sheeting where the color coat is the finished surface and the zinc layer underneath carries the corrosion duty.
Sandwich Panel Facings
Insulated panel skins bonded to a core, where a uniform painted face is needed on both sides of the panel line.
Home Appliance Housings
Formed cabinet panels and covers where a painted galvanized base replaces a paint line inside the appliance plant.
Ceiling Systems and Interior Partitions
Light gauge interior components using a lighter zinc coating because exposure is low but the finish still has to look uniform.
Shutters Doors and Framing Profiles
Roller shutter slats, door skins and framing sections that are formed from strip and installed without further finishing.
Who It Is For
Buyers Who Specify This Product
- Roll forming plants buying color coated coil for roof and wall profiles
- Sandwich panel manufacturers sourcing painted facings for continuous panel lines
- Appliance manufacturers replacing an in-house paint line with pre-finished strip
- Building contractors specifying cladding that arrives finished on site
- Metal service centers decoiling painted coil to strip widths for regional fabricators
- Project buyers matching a base grade callout such as SGCC DX51D Q235B or G550
Technical Data
Specifications and Technical Features
Values below come from the product data published by Shandong Tianyu Metal Products. Confirm the exact grade and size against your order.
| Product Name | Pre-Painted Galvanized Steel Coil |
|---|---|
| Also Known As | PPGI color coated galvanized steel coil |
| Material | G250 G350 G450 G550 A36 SS400 S275 S235 Q195 Q215 Q235B Q345B SGCC DX51D |
| Zinc Coating | G20 G30 G40 G60 G90 Z40 Z60 Z80 Z100 Z120 Z150 Z275 Z350 |
| Galvanizing Technology | Hot-dipped or electro |
| Base Product | Galvanized steel coil |
| Finish | Pre-painted color coat over the zinc layer |
| Form | Coil or cut to length sheet |
| Place of Origin | China |
Technical Features
- Base steel grades G250 G350 G450 G550 A36 SS400 S275 S235 Q195 Q215 Q235B Q345B SGCC and DX51D
- Zinc coating G20 G30 G40 G60 G90 Z40 Z60 Z80 Z100 Z120 Z150 Z275 and Z350
- Galvanizing technology hot-dipped or electro
- Color coat applied at coil stage over the galvanized base
- Supplied in coil for roll forming or cut to length as sheet
- Zinc layer retained as the corrosion barrier beneath the paint film
Materials
- Galvanized steel coil base in drawing grades SGCC and DX51D
- Structural base grades Q195 Q215 Q235B Q345B S235 and S275
- High strength base grades G250 G350 G450 and G550
- Zinc coating applied hot-dipped or by the electro route
- Organic color coat applied over the galvanized surface
Manufacturing
How It Is Made and Processed
Base coil selection in the ordered drawing or structural grade
Galvanizing by hot dip or electro to the ordered coating mass
Surface cleaning and pretreatment before painting
Color coat application and curing on the coil line
Recoiling and decoiling to the ordered width
Cut to length where sheet is ordered
Coil wrapping and edge protection for export loading
Quality Control
Checks Before It Ships
- Base grade confirmed against the ordered designation before coating
- Zinc coating mass verified against the ordered G or Z figure
- Painted surface inspected for coverage and finish defects along the coil
- Galvanizing route recorded as hot-dipped or electro on the order
- Coil edges and wrapping checked before loading to prevent transit damage
Customization
What We Can Change on Your Order
- Base grade selected from SGCC and DX51D through to G550
- Zinc coating mass chosen anywhere from G20 to Z350 for the exposure
- Hot-dipped or electro galvanizing specified on the order
- Coil slit to your roll former strip width
- Cut to length sheet supplied instead of coil
- Color finish matched to the panel specification for a staged project
Comparison
Pre-Painted Galvanized Steel Coil Against the Alternatives
| Bare galvanized coil painted after fabrication | The color coat is applied flat on the coil line rather than over bends and edges, and the fabricator does not run a paint booth. |
|---|---|
| Painted cold rolled steel with no zinc layer | A zinc coating from G20 to Z350 sits under the paint, so a scratch in the film does not expose bare steel to the atmosphere. |
| Aluminum sheet for cladding | Steel base grades up to G550 give higher strength for the same gauge, which matters on spanning roof and wall profiles. |
| Pre-painted galvalume coil | A galvanized base with hot-dipped or electro zinc is the usual choice where forming behaviour and cost drive the specification rather than maximum outdoor corrosion life. |
Use Guide
Specifying Handling and Welding Notes
- Specify the base grade and the zinc coating mass separately since strength and corrosion duty are chosen independently
- Choose hot-dipped zinc for exterior exposure and consider electro where a smooth base under the paint matters most
- Handle coils with clean rollers and protective film so the painted face is not marked before forming
- Set roll former tooling for a coated strip and check the first panel for paint damage at the tightest bend
- Store coils indoors and dry because condensation trapped between wraps marks a painted surface
- Send the profile drawing and panel length with the order so strip width and cut length are set before shipment
Questions Buyers Ask
Pre-Painted Galvanized Steel Coil FAQ
Which base grades can the paint be applied over?
The range covers SGCC, DX51D, Q195, Q215, Q235B, Q345B, S235, S275, A36, SS400 and G250 to G550, so both drawing and structural callouts can be filled.
What zinc coating mass is available under the paint?
Coating mass runs G20, G30, G40, G60, G90 and Z40 through Z350, including Z275. The right one depends on whether the panel is interior or exposed.
Is the zinc hot-dipped or electro galvanized?
Both routes are available. State which one your specification calls for and it will be confirmed on the order.
Can you slit the coil to our roll former width?
Yes. Send the strip width and coil weight your line takes and the coil will be slit before shipment.
Do you supply flat sheet instead of coil?
Cut to length sheet can be supplied instead of coil. Give the sheet length and quantity with the order.
How do we keep the paint from being damaged in transit?
Coils are wrapped with edge protection before loading. Tell us if your unloading equipment needs eye horizontal or eye vertical presentation.
What happens if the paint gets scratched on site?
The zinc coating under the paint stays as the corrosion barrier at the scratch, which is the reason a galvanized base is used rather than bare cold rolled steel.
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