Hot-dip zinc-coated coils for wholesale forming and distribution orders
Galvanized coil combines the selected base steel with a specified zinc coating. Our catalog covers 0.12–3.0 mm thickness and 600–1,500 mm width, with commercial, forming and structural choices for roll forming and sheet-metal fabrication.
| Parameter | Range or option | Order detail |
|---|---|---|
| Catalog thickness | 0.12–3.0 mm | 0.0047–0.1181 in.; rounded conversion |
| Strip width | 600–1500 mm | 23.62–59.06 in.; rounded conversion |
| Coil inside diameter | 508 or 610 mm | Bore selected for the receiving mandrel |
| Steel specification | ASTM A653/A653M; EN 10346; JIS G 3302 | Grade or type and coating designation remain separate |
| Surface options | Regular, minimized or zero spangle; skin-pass request | Appearance and treatment defined for the intended operation |
| Delivery format | Full-width coils; requested slit or cut-length preparation | Finished dimensions and processing itemized on the quote |
| Coating requirement | Designation under the selected ASTM, EN or JIS specification | Quoted with the steel grade and strip dimensions |
Millimeter dimensions are the catalog basis. We quote the steel grade, zinc designation and thickness-width combination together, with the thickness measurement basis and tolerances. Coil outside diameter and individual weight follow the receiving equipment.
Zinc coating weight controls the amount of protective zinc, while the steel grade controls strength and formability. The specified exposure, forming operation and subsequent finish determine the coating requirement. A heavier coating also changes cost and forming behavior.
G-series orders use oz/ft² and ASTM A653; Z-series orders use g/m² and ASTM A653M. We retain the requested designation and unit system on the material line. Similar nominal coating levels are not an automatic substitution between specifications.
Find a coating designation or unit system.
| Designation | Specification / unit system | Minimum total coating | Unit |
|---|---|---|---|
| G30 | ASTM A653 — inch-pound | 0.30 | oz/ft² |
| G60 | ASTM A653 — inch-pound | 0.60 | oz/ft² |
| G90 | ASTM A653 — inch-pound | 0.90 | oz/ft² |
| Z90 | ASTM A653M — SI | 90 | g/m² |
| Z180 | ASTM A653M — SI | 180 | g/m² |
| Z275 | ASTM A653M — SI | 275 | g/m² |
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Values are coating reference minima for the original full-width sheet, not measured results for a shipment. Single-spot and per-side requirements also apply under the specified standard. Total-both-sides values do not require equal coating on each face; the accepted order retains its applicable test basis.
| Designation | Specification | Material identity | Purchase decision |
|---|---|---|---|
| CS Type A / B | ASTM A653/A653M | Commercial steel | General fabrication with the specified type and properties |
| FS Type A / B | ASTM A653/A653M | Forming steel | Formed parts with the required forming acceptance |
| SS Grades 33 / 40 / 50 | ASTM A653/A653M | Structural steel | Strength grade and class specified for the designed member |
| DX51D+Z | EN 10346 | Steel for bending and profiling | Defined delivery requirements for the intended profile |
| DX52D+Z | EN 10346 | Drawing-quality zinc-coated steel | Selected for the part geometry and forming requirements |
| S350GD+Z | EN 10346 | Structural zinc-coated steel | Structural grade paired with the specified zinc coating |
| SGCC | JIS G 3302 | Commercial-quality galvanized steel | JIS identity retained with the required coating and finish |
For bent or drawn parts, select the grade and delivered forming properties for the operation. Full-hard material has limited ductility; its hardness and bend requirements remain explicit on the order. Structural grades follow the member’s strength requirement. We quote ASTM, EN and JIS under their own specifications, and list any proposed alternative separately.
Regular spangle shows visible zinc crystals; minimized and zero-spangle descriptions address the surface appearance. Spangle size does not identify coating weight. For visible components, the agreed finish and appearance criteria define the face supplied.
Skin passing changes the surface texture and can improve flatness and resistance to stretcher-strain marks. The order defines the required skin-pass condition and finish; an exposed panel also needs its own surface-quality acceptance.
Passivation and oil are separate treatment choices. They support storage protection or subsequent processing, but the paint or adhesive system determines the compatible treatment and cleaning route. Painting orders identify the pretreatment requirements; oiled material includes the required degreasing step.
Base-metal thickness measures the steel substrate; total coated thickness includes zinc on both faces. A decimal thickness and tolerance with the stated measurement basis gives the tooling and receiving team the same requirement. Gauge names alone leave that basis unresolved.
Slitting exposes the cut steel edge and introduces edge, burr and camber requirements. We price requested slit widths or cut lengths as a separate preparation scope. A narrow slit strip uses the applicable coating acceptance for that product, rather than an assumed full-width triple-spot result.
The inside diameter, maximum outside diameter, individual coil weight and winding direction determine line compatibility. Eye orientation and any exposed-face requirement follow the unloading and feed arrangement. These limits are carried through the accepted coil schedule.
Structural roll-formed members start with the designed steel grade and thickness, then the specified zinc coating. Profile geometry, bend radii and member design govern the material choice. We quote the coil input; finished-member approval belongs to the fabricated product.
For roofing feedstock, compare galvanized and aluminum-zinc coatings against the exposure and finished panel details.
Folded cabinets, ventilation components and similar sheet-metal parts need material that tolerates the bends. The commercial or forming designation follows the part severity. For visible panels, handling and tooling must also preserve the agreed surface face.
A drawn shape needs the selected forming grade, thickness and lubrication condition to work together. The production trial assesses the actual part and tooling, including coating adhesion around the strained areas. The approved requirement then controls the production order.
Dimensional checks use the agreed base-metal or coated-thickness basis. Width, edge condition and coil geometry are recorded against the accepted supply line, including any finished slit-width tolerance.
Coating records identify the designation, unit and test method. The applicable full-width, single-spot and per-side criteria determine acceptance. A handheld thickness reading is not automatically the standard coating-weight result.
The agreed inspection scope covers coating continuity, surface defects and applicable adhesion or bend requirements. Forming-sensitive orders retain the relevant test requirements alongside the steel grade.
Coil identification links the delivered strip to its grade, zinc coating and inspection reports. The required mechanical, coating and dimensional records are included in the shipment documents.
GI prices are quoted by net tonnage for the specified steel grade, zinc designation and finish. Slitting, cut lengths, packing and freight are itemized, with lot quantities and production terms for each material line.
The agreed packing scope covers dry barrier protection, side and eye guards, strapping and a suitable shipping saddle. Gross weight includes the packing; net weight identifies the delivered steel. Coil numbers and individual weights appear on the packing list.
Moisture trapped between tightly wound galvanized layers can cause white storage stain. Keep coils dry and ventilated, inspect packing on receipt and deal with wet wrapping promptly. Condensation control matters when cold coils enter a warmer building; protective treatment does not replace dry storage.
No. Galvanized coil has a zinc coating; galvannealed coil is processed to form a zinc-iron alloy coating. The coating designation and forming behavior differ. We keep a galvannealed request as a separate product requirement rather than replacing it with GI.
Yes, with a welding procedure suitable for the zinc-coated steel and the joint. Zinc affects welding conditions and creates fumes that require proper controls. The fabrication plan includes the relevant procedure and treatment of coating damaged around the weld.
Slitting, cutting and drilling expose steel at the edge of the zinc-coated sheet. The final component specification determines whether additional edge or local coating repair is required for its exposure. Include that fabrication requirement when choosing the material and protection system.
Our GI range has a metallic zinc surface. A factory-applied color finish requires a prepainted coil order with its paint system, color and film requirements. Bare GI supplied for a customer painting line instead carries the agreed surface-treatment condition.
G90 is an ASTM coating-mass designation in oz/ft² on a total-both-sides basis. It is not a 90 µm thickness per face; the ordered standard also sets the applicable sampling and acceptance requirements.
The steel grade, spangle and surface treatment are separate selections on the GI line. We review the requested combination with strip dimensions and forming requirements before quoting the material.
Send your galvanized coil schedule, coating designation and destination. We quote the exact grade, strip size and thickness basis with surface treatment, coil geometry and any slit or cut-length preparation.