EN 10346 / GENERAL FORMING
DX51D+Z
Widely requested cold-forming substrate for profiling and general fabrication. Specify coating and bend requirement.
Global Steel Supply & Processing
GI COIL | EN 10346 / ASTM A653 / JIS G 3302
GI COIL FOR FABRICATION / ROOFING / DISTRIBUTION
Source hot-dip galvanized steel coil for roofing profiles, HVAC fabrication, roll forming and industrial distribution. Choose the substrate grade, zinc coating designation, surface finish and target coil weight for a tailored quotation.
Explore product specifications ↓A useful GI coil quotation identifies both the base-steel grade and the zinc coating requirement. These indicative enquiry ranges are not a standing stock or mill capability guarantee.
| Specification | Ordering detail |
|---|---|
| Product | Hot-Dip Galvanized Steel Coil (GI / HDG) — zinc-coated flat steel in coil form |
| International standards | EN 10346:2015; ASTM A653/A653M-25a; JIS G 3302 (edition to be confirmed in contract) |
| General coated-sheet requirements | ASTM A924/A924M-26 where applicable to ASTM orders |
| Forming-grade enquiries | DX51D+Z, DX52D+Z, DX53D+Z; ASTM Commercial Steel / Forming Steel; JIS SGCC |
| Structural-grade enquiries | S220GD+Z to S350GD+Z; ASTM Structural Steel grades; strength grade specified separately |
| Indicative enquiry thickness | 0.30–3.00 mm; confirm available grade, mill range and whether gauge includes coating |
| Indicative enquiry width | 600–1,500 mm; mill and slit widths on request |
| Zinc coating designations | Z100, Z140, Z180, Z275, Z350; ASTM G40 / G60 / G90 as applicable |
| Surface | Regular or minimized spangle, skin-passed, passivated and/or oiled as agreed |
| Coil dimensions | Specify inside diameter, maximum outside diameter, net coil mass and edge condition |
| Inspection | MTC, dimensions, zinc coating mass, surface inspection and additional tests by agreement |
Different base grades respond differently to roll forming, stamping, drawing and structural loading. Match the substrate to the finished part rather than buying on coating appearance alone.
Widely requested cold-forming substrate for profiling and general fabrication. Specify coating and bend requirement.
A drawing-quality option when the finished part needs more forming capability than general commercial use.
For applications with more demanding forming operations. Confirm mechanical and coating acceptance conditions.
Strength-graded galvanized coil for specified structural forming work; verify yield strength and profiling conditions.
Commercial, forming and structural categories use distinct mechanical requirements. Choose the product type in the RFQ.
Specify SGCC or the required JIS forming/structural designation, zinc mass, finish and tolerances.
Include the grade, standard edition, thickness, width, zinc coating and annual or project quantity.
Coating mass affects sacrificial protection, forming behavior and downstream paint performance. Select it based on the project environment and the applicable product standard.
| EN +Z designation | Min. total coating mass (g/m²) | Nominal guide thickness / face | Ordering note |
|---|---|---|---|
| Z100 | 100 | Approx. 7 µm per side | For defined lower coating-mass requirements |
| Z140 | 140 | Approx. 10 µm per side | Common fabrication enquiry |
| Z180 | 180 | Approx. 13 µm per side | A higher mass option, subject to forming requirements |
| Z275 | 275 | Approx. 20 µm per side | Often specified for roofing and outdoor components |
| Z350 | 350 | Approx. 25 µm per side | Specify with process, bend radius and service conditions |
Specify appearance, coating uniformity and temporary protection separately. A bright visible pattern should not be used as a substitute for coating test results.
Visible crystallized zinc pattern. Specify an agreed sample if surface appearance matters.
More restrained visual texture, typically considered for appearance-sensitive or coated applications.
A finishing operation that can improve flatness and surface consistency according to the ordered product.
Select surface protection and storage conditions to help manage transport staining and fabrication needs.
Describe the required visual pattern and any surface acceptance limits.
Discuss finish consistency, painting and downstream forming plans.
Use the project drawing or customer specification to select the controlling standard and quality documentation. Different standards may classify substrates and coatings differently.
Continuously hot-dip coated flat steel products for cold forming and structural applications; defines grade and coating designations.
Hot-dip zinc-coated or zinc-iron alloy-coated steel sheet in coil and cut-length form. Different product categories have different strength and formability rules.
Hot-dip zinc-coated steel sheets and coils including SGCC and additional forming or structural grade designations.
Clear material data is the quickest way to compare bulk quotes and avoid mismatched coating, coil geometry or delivery terms.
Confirm DX51D+Z, SGCC, a structural grade or an ASTM category, with the standard edition.
Give Z designation or ASTM G designation; include spangle, passivation and oiling.
Specify steel gauge basis, width, core inner diameter, maximum coil mass and edge condition.
Provide tonnes, packing requirements, delivery terms, destination and delivery schedule.
Attach mill-specific tolerances, profile drawings or a coating specification when these determine final acceptance.
Galvanized coil supports downstream fabrication where a zinc-coated surface and an appropriate steel substrate are part of the material specification.
Coil feedstock for corrugated or trapezoidal roofing and cladding sheets, subject to profile and coating requirements.
Galvanized sheet and strip for ducts, ventilation housings, plenums and duct accessories.
Brackets, cabinets, panels and general sheet-metal parts where grade and bend performance are specified.
Coils for slit-strip or cut-to-length conversion, with repeatable width and mass requirements.
Cladding and formed parts for equipment or buildings after environmental design review.
Purlins and profiles requiring a specified structural-strength galvanized grade.
Use the actual basis of thickness before entering coil dimensions. Coated coil weight depends on base steel gauge, zinc coating mass and actual weighing.
Enter the bare steel substrate thickness plus total two-side zinc coating mass. This calculation adds zinc mass to the steel substrate weight instead of double-counting the coating.
Illustrative only. Nominal mass, coated sheet tolerances and mill test results govern final commercial weight.
Approx. kg/m = (base steel mm × width mm × 0.00785) + (zinc coating g/m² × width m ÷ 1000).
Length (m) = net coil kg ÷ kg/m.
A controlled coating line combines an appropriate substrate with zinc coating and surface finishing. The delivered coil specification determines what is inspected and documented.
The selected forming or structural substrate is rolled to the specified thickness and width.
Continuous hot-dip zinc coating is applied according to product standard and coating mass target.
Spangle, skin-pass and any agreed surface treatment are controlled for downstream use.
Coating, thickness, width, marking and coil packing are checked to the order plan.
We combine broad steel operations with specification-led inquiry handling. Grade-specific availability, lead time and documents are confirmed for each order.
An established steel business with reported 8 million MT annual steel production across its overall operations.
Regular inventory across the steel business; specific galvanized grades and coil sizes are verified at quotation.
Specify MTC, zinc coating mass, size tolerance and additional inspection points in the RFQ.
Coil packing, handling weight, delivery terms and shipping details are discussed before dispatch.
Discuss available processing arrangements with the quotation team. All cut sizes and tolerances are reviewed against material, coating and order quantity.
Narrow strip widths for profile, fabrication and component production. Confirm edge, burr and packing requirements.
Request prepared sheets and lengths when downstream equipment requires flat blanks instead of full coils.
Match coil thickness, coating and width to a roofing or profile line; supply finished profile requirements in the RFQ.
Send finished dimensions, tolerances, edge details and the intended conversion process.
Check the actual contract acceptance requirements instead of assuming every coil is tested to the same set of properties.
The coating designation, grade category and surface class belong to different checks. State which documents and tests your customer or project requires.
Specific galvanized coil stock and delivery dates are quoted after identifying the complete specification.
Our company-wide inventory covers many steel product families. Actual GI coil stock varies by zinc mass, grade, width and weight. Share the complete specification to receive a realistic stock or production quotation.
Define packing and loading constraints early to reduce transport and handling issues for zinc-coated surfaces.
Coil shipment planning should address moisture exposure, edge protection, loading weight and the unloading equipment at destination. Packing construction is agreed according to coil size and shipment method.
Compare galvanized coil with cut sheet, aluminum-zinc coatings and prepainted products for your fabrication and project needs.
Internal links should be checked against published WordPress slugs before launch; grade-specific GI coil pages can be added here as their URLs are confirmed.
Practical answers on zinc mass, grades, surface treatments and bulk ordering requirements.
It is flat steel supplied as coil with a protective zinc coating, commonly applied by a continuous hot-dip process. The steel grade, zinc mass and product standard must be specified.
No. DX51D identifies the steel grade and +Z the type of metallic coating; Z275 specifies a zinc coating mass designation and must be stated separately.
No. Under EN 10346, Z275 refers to a minimum total coating mass for both coated surfaces under the specified test method.
They have broadly similar numerical coating masses but belong to different standards and acceptance rules. Quote and inspect against the actual ordered specification.
Clarify whether your project states the finished coated thickness or the bare steel substrate thickness. A weight calculation using both concepts without adjustment can be misleading.
Surface appearance can be part of the purchase requirements. Specify regular/minimized spangle and any sampling or inspection criteria.
It is commonly converted into roofing and cladding profiles. Appropriate base grade, coating mass, profile design and environmental exposure need review.
Submit the finished strip widths, parent coil dimensions, edge quality, quantity and packing requirements so availability and processing can be quoted.
GI typically refers to zinc-coated steel; Galvalume is an aluminum-zinc metallic coating system with a different specification. Use the coating required by your service conditions.
No. Forming suitability depends on the steel substrate grade, condition, coating and part geometry. Drawing grades should be specified explicitly.
A material test certificate and agreed inspection records can be discussed at quotation. Additional coating, mechanical or third-party tests should be specified before order confirmation.
Send the standard, substrate grade, zinc mass, surface finish, dimensions, coil ID, mass per coil, total quantity, destination and delivery requirements.
Tell us the steel grade, EN / ASTM / JIS standard, gauge basis, width, zinc coating class, spangle or passivation requirement, coil ID, net coil weight, total quantity and destination. Attach drawings or order specifications when available.
Send your required grade, dimensions, quantity and destination. Our team will review the inquiry.