Sino Steel supplies conventional 55% aluminum-zinc-silicon alloy-coated steel coil for roll forming, roofing feedstock, fabrication and downstream prepainted products. As a Galvalume steel coil manufacturer and supplier, we match the base-steel designation, Al-Zn coating requirement, coil size, surface condition, factory slitting, coating inspection and export packing to the order.
Galvalume and galvanized coil may use similar base steel and coil dimensions, but they use different metallic coating systems. The buyer should specify the required coating route before price and processing are compared.
This page is written around the conventional ASTM A792 Type 1 route: 55% aluminum-zinc-silicon alloy coating applied by the hot-dip process.
Conventional galvanized coil uses a zinc-based coating route and should be quoted as a separate coated-steel product.
Send the actual metallic coating system so the factory does not quote GI when the project requires Al-Zn alloy-coated steel.
Forming behavior and structural performance still depend on the steel beneath the Al-Zn coating. Send the full base-steel designation when the purchase specification already gives one.
A792 covers 55% aluminum-zinc alloy-coated sheet in coils and cut lengths with multiple steel designations for different application requirements.
A924 provides general requirements used with continuously hot-dip metallic-coated sheet product specifications.
EN 10346 includes continuously hot-dip coated flat products with an aluminum-zinc alloy coating route. Use the complete steel and AZ designation from the RFQ.
If the buyer uses another national or mill designation, send it as written instead of converting it into an approximate ASTM or EN grade.
A product name alone does not tell the manufacturer which coating designation, coating mass or standard the buyer requires. Put the original coating requirement from the project on the RFQ.
Confirm that the order requires the conventional 55% Al-Zn-Si route rather than zinc-coated or another metallic-coated steel.
Send the original ASTM, EN or project designation instead of vague wording such as “heavy coating.”
Keep strength and formability requirements separate from the metallic coating requirement.
A forming-grade coil and a structural-grade coil can use the same coating family while behaving differently on the buyer's line.
Galvalume surface inspection should focus on the ordered coating appearance and how the coil will be roll formed, painted or used as feedstock. We do not copy the GI page's spangle language as if the coatings were identical.
Thickness and width describe the strip. Coil ID, outside diameter and maximum coil weight determine whether the material can actually be loaded onto the buyer's equipment.
Send the finished coated-steel size required by the downstream process.
Include a fixed internal diameter when the uncoiler or forming line requires one.
State crane, rack, container or uncoiler limits before the factory selects or rewinds the coil.
Add the outer-diameter limit when equipment clearance or storage space is restricted.
Slitting changes the finished width and creates new exposed edges. The slit coil still needs to remain linked to the original Al-Zn coated mother coil.
Use the width required by the roll-forming, stamping or downstream coil line.
Check the newly slit edge where burr or damage could affect forming, handling or visible finished edges.
Finished slit coils should remain stable, aligned and practical for the buyer's next line.
Factory slitting changes width, not the original base-steel and metallic-coating identity.
The broad faces carry the original factory-applied metallic coating. Slitting exposes a new steel edge, so edge condition should be reviewed separately when the final product leaves that edge exposed.
Check finished width, burr and localized damage after slitting.
Tell us if the slit edge remains visible or becomes a folded, locked or overlapped edge after roll forming.
Narrow slit coils may need added edge protection during factory packing and transport.
Roofing, cladding and roll-formed parts bend the coated strip repeatedly. The buyer therefore needs more than a visual warehouse inspection of the flat coil.
Confirm the base steel and thickness are appropriate for the profile and forming route specified by the buyer.
Where required, review coating behavior after the specified bend or forming test rather than only while the sheet is flat.
Sharp profile bends can reveal coating or substrate problems that were not obvious on the original coil surface.
If the coil will be prepainted later, identify that route before surface treatment and downstream processing are finalized.
A correct strip thickness does not prove the ordered Al-Zn coating. Final inspection should connect coating measurements, surface condition and finished coil identity.
XRF or another applicable standard method can be used where coating-mass verification is required by the order and inspection plan.
Review coating appearance, roll marks, scratches and localized handling damage according to the ordered surface requirement.
Where specified, evaluate the coated material after the applicable bend or forming test instead of relying only on flat-sheet appearance.
Metallic-coated coil still needs dry handling. Water trapped inside wrapping or between coated surfaces can create staining during storage and shipment.
Do not seal obvious rainwater or process water inside the finished package.
Temperature changes during transport can create moisture even when the factory packed the coil dry.
Use anti-fingerprint, passivation, oiling or another treatment only where it matches the ordered product and downstream process.
Damaged outer wrapping and exposed edges should be corrected before shipment where they could allow water entry.
Mill, manufacturer and factory records should keep the base steel, Al-Zn coating route, original coil and finished slit coils connected throughout processing and shipment.
Finished slit coils can have different widths and weights, but they should still trace back to the original material and coating record required by the order.
A Galvalume steel coil supplier should match packing to master coil or slit coil, shipping orientation, surface condition and handling method instead of relying on one generic “seaworthy” description.
Use suitable skids, saddles or supports to control movement and protect the coil during handling.
Protect coil eyes and edges from impact, especially on narrow slit coils.
Outer wrapping should reduce water entry without sealing visibly wet material inside the package.
Finished slit coils need stable separation and identification so edges and coating are not damaged during transport.
For buyers who need conventional zinc-coated GI / HDG coil rather than an Al-Zn alloy coating.
View Galvanized Steel Coil →For organic paint systems applied over the specified metallic-coated substrate.
View PPGL Steel Coil →For buyers who need individual Al-Zn coated sheets rather than master or slit coil.
View Galvalume Steel Sheet →For GI, Galvalume, PPGI, PPGL and related coated-steel purchasing routes.
View Coated Steel →They use different metallic coating systems. The Galvalume content on this page refers to the conventional 55% aluminum-zinc-silicon alloy-coated route, while galvanized coil uses a zinc-based coating route.
Send the product standard or base-steel designation, thickness, width, Al-Zn coating requirement, quantity and destination. Add coil ID, maximum coil weight, slit width, surface treatment or packing requirements when they matter to your line.
Yes. Current ASTM A792 recognizes more than one aluminum-zinc alloy coating type. This page intentionally presents the conventional Type 1 Al-Zn-Si route; a different coating chemistry should be confirmed separately before quotation.
Yes. Factory slitting can be arranged for suitable orders. Finished slit width, burr, edge condition, coil ID / weight and mother-coil traceability should be confirmed before release.
XRF is one recognized coating-mass test route for metallic-coated steel sheet. The final test method and acceptance basis should follow the ordered product standard and inspection requirement.
Keep the coil dry before packing, use the specified surface treatment where required, reduce water entry, inspect wrapping and manage condensation risk during shipment and storage.
Base-steel designation, thickness, width, Al-Zn coating requirement, quantity and destination are enough to start. Add surface treatment, coil ID, maximum coil weight, slit width, edge or packing details when they matter to production.
