Description
Factory-direct mill with full traceability — Every DX51D and SGCC sheet rolls from our own hot-dipped galvanizing line with zinc coating verified per heat number.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | DX51D / SGCC Galvanized Steel Sheet |
| Product Type | Steel Sheet / Plate |
| Steel Grade | DX51D, DX52D, DX53D, DX54D, S220GD, S250GD, S280GD, S350GD, S550GD, SGCC, SGHC, SGCH, SGH340, SGH400, SGH440, SGH490, SGH540, SGCD1, SGCD2, SGCD3, SGC340, SGC490, SGC570, Q235 |
| Standard | EN 10147, EN 10142, DIN 17162, JIS G3302, ASTM A653 |
| Thickness | 0.12–6.00 mm |
| Width | 600–1500 mm |
| Length | 2 m or custom |
| Technique | Hot Rolled Based / Hot Dipped Galvanized |
| Zinc Coating | Z30–Z275 g/m² |
| Surface Treatment | Passivation (C), Oiling (O), Lacquer Sealing (L), Phosphating (P), Untreated (U) |
| Spangle | Zero Spangle / Regular Spangle / Minimum Spangle / Big Spangle |
| Tolerance | ±1% |
| ID (Coil) | 508 mm / 610 mm |
| Hardness | Full Hard |
| Skin Pass | Yes |
| Processing Service | Welding, Punching, Cutting, Bending, Decoiling |
| Application | Building materials, Electrical appliances, Making pipes, Cutting sheets, Making corrugated sheets, Making containers, Making fences, Making small tools |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Building & Construction | Roofing panels, wall cladding, corrugated sheets, structural floor decking |
| Industrial Fabrication | Container body panels, fence posts and mesh, pipe and tube blanks |
| Infrastructure & EPC | Equipment enclosures, cable tray supports, electrical appliance housings |
| Warehouse & Logistics | Purlin sheets, liner panels, mezzanine flooring |
When Zinc Coating Weight Decides Whether Your Roof Lasts Five Years or Twenty
Specifying Z60 for a coastal warehouse when Z275 was needed is the single most expensive line item on a drawing.
Buyers sourcing Galvanized Steel Sheet Manufacturer – Hot Dipped GI Sheet Supplier from China often discover coating gaps only after salt spray failure on site. Third-party sourcing creates material traceability breaks — the mill test certificate references a heat number that cannot be traced back to the galvanizing bath log. [NEED_CITE: hot dip galvanized coating thickness standards for corrosive environments] Inconsistent zinc distribution across coil width leads to premature rust at cut edges and fastener holes, triggering warranty claims that far exceed the original material savings.
Matching Grade and Coating to Corrosive Exposure on Site
A Galvanized Steel Sheet Manufacturer – Hot Dipped GI Sheet Supplier must align steel grade selection with both forming requirements and environmental exposure. DX51D and SGCC serve general roll-forming and profile bending where moderate ductility suffices, while DX53D and DX54D handle deep-drawn fan housings and complex container corners. For structural purlins and load-bearing wall panels, S250GD through S550GD provide the yield strength needed to span without intermediate support. Coastal and industrial atmosphere projects demand Z275 coating with passivation or lacquer sealing surface treatment, whereas indoor electrical enclosures perform adequately with Z30–Z60 and oiling only.
Engineering Compliance and Certification Pathways
Galvanized sheet specified under EN 10142 for cold-reduced products or EN 10147 for cold-formed structural grades must carry documentation that satisfies EU notified body audits. [NEED_CITE: EN 10147 structural galvanized steel grade requirements] ASTM A653 and JIS G3302 govern North American and Japanese-spec projects respectively, and mixing standards without equivalence verification creates customs and inspection failures. Our vertically integrated mill produces both the hot-rolled substrate and the galvanized finish under one quality management system, meaning chemical composition, coating weight, and mechanical test results all reference the same heat number from raw slab to finished coil.
Understanding the Grade Designation System and What It Actually Controls
The DX and SG prefixes indicate different standardization bodies — DX follows the European EN designation where the second digit reflects forming severity (1 for commercial, 3 for deep drawing, 4 for extra deep drawing), while SG follows JIS G3302 where suffix letters C, D, H denote commercial, drawing, or hard full-hard condition. S-series grades like S220GD and S350GD add guaranteed minimum yield strength for structural applications, a requirement that commercial grades DX51D and SGCC do not carry. Hot-dipped galvanizing bonds zinc metallurgically to the steel substrate, providing sacrificial cathodic protection that electroplated coatings cannot match — the coating weight range Z30 to Z275 g/m² directly determines service life in defined corrosivity categories per ISO 9223. [NEED_CITE: zinc coating weight and service life correlation in atmospheric corrosion] Spangle selection affects paint adhesion: zero spangle provides uniform surface for direct coating, while regular spangle offers cost savings where appearance is secondary.
The Hidden Cost of Coating Shortfall and Grade Substitution
Ordering DX51D at Z180 and receiving Z80 means the Galvanized Steel Sheet Manufacturer – Hot Dipped GI Sheet Supplier has shifted cost savings onto your project’s maintenance budget. Coating shortfall of this magnitude accelerates white rust formation within months in humid environments, and red rust breakthrough occurs years ahead of design life. [NEED_CITE: consequences of substandard galvanized coating on structural durability] Grade substitution — supplying SGCC where S250GD was specified — creates structural deflection risk that only manifests under full service load, long after the material has been cut, welded, and erected. Replacing erected panels costs multiples of the original material value and delays project handover.
Why Project Procurement Teams Source Through Our Mill
Our facility operates three production lines covering both raw steel making and downstream fabrication, meaning the hot-rolled substrate that becomes your DX51D or S350GD galvanized sheet never leaves our quality control boundary. Every coil carries a mill test certificate traceable to heat number, with coating weight verified by X-ray fluorescence measurement on both surfaces. We maintain over 2,800 specification combinations in inventory, allowing single-source procurement across multiple grades and thicknesses for complex projects. Third-party inspection by SGS, BV, or TÜV is available before shipment, and our export documentation package satisfies customs requirements across EU, Middle East, Southeast Asian, and African markets. Professional loading planning handles both coil and cut-to-length sheet in shared containers, maximizing freight efficiency.
Documentation & Compliance
- Mill test certificate documenting DX51D and SGCC chemical composition, coating weight Z30–Z275, and mechanical properties per EN 10142 and JIS G3302
- CE marking and EN compliance declaration for structural grades S220GD through S550GD per EN 10147
- ISO 9001 quality management certificate covering hot rolling, galvanizing, and cold rolling processes
- SGS or BV third-party inspection report verifying coating weight, surface treatment, and dimensional tolerance before shipment
- Full material traceability linking each coil and sheet to original heat number and galvanizing bath record
- Export customs documentation including packing list, bill of lading, and certificate of origin for destination country clearance
Packaging, Loading & Delivery
- Galvanized coils packed with three steel straps, edge protectors, and waterproof wrapping to preserve Z30–Z275 coating during ocean transit
- Cut-to-length sheets stacked on wooden pallets with interleaving paper to prevent surface scratching on zero spangle and minimum spangle finishes
- Container loading optimized for 600–1500 mm width coils and 2 m custom-length sheets, with weight distribution calculated for 20ft and 40ft containers
- Heat number and grade identification marked on each coil ID and sheet bundle for site traceability
- Surface treatment verification (passivation C, oiling O, lacquer sealing L, phosphating P) confirmed before wrapping
- FOB, CIF, and DDP terms available with door-to-door logistics coordination for project sites
Starting Your Procurement Process
Share your project drawings, required steel grades (DX51D, SGCC, S250GD, etc.), coating weight specification, and destination port — we respond within 24 hours with a detailed quotation including material, processing, and shipping costs. Our engineering team reviews shop drawings for material optimization and fabrication sequencing before production begins, and we confirm all certification and inspection requirements at the inquiry stage.
Request Your Quotation with Mill Test Certificate
Send your specifications, steel grade, coating weight, and quantity to receive a detailed quotation with full material documentation.
Company: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjystructure.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
Frequently Asked Questions
Q: What is the difference between DX51D and SGCC for general fabrication?
A: DX51D follows the European EN 10142 designation for commercial quality cold-reduced galvanized sheet, while SGCC follows JIS G3302 for commercial quality. Both offer equivalent formability for roll-forming, bending, and punching applications, and we supply both grades with coating weights from Z30 to Z275 g/m².
Q: How do I select the right zinc coating weight for my project environment?
A: Z30 to Z60 suits indoor applications and temporary structures, Z100 to Z180 covers general outdoor building panels in moderate atmospheres, while Z200 to Z275 is required for coastal, industrial, or high-humidity environments where extended corrosion resistance is critical.
Q: Can you provide zero spangle finish for painting applications?
A: Yes, we offer zero spangle, minimum spangle, regular spangle, and big spangle options. Zero spangle provides the most uniform surface for direct paint adhesion without visible crystallization patterns, and is available across DX51D, DX52D, and SGCC grades.
Q: What processing services do you offer on galvanized sheet?
A: We provide CNC cutting, punching, bending, decoiling, and welding services on galvanized sheet and plate. Our fabrication facility handles project-specific components to engineering drawings, with welding procedures qualified to AWS and EN standards.
Q: What quality documentation accompanies each shipment?
A: Every shipment includes mill test certificates with chemical composition and mechanical properties traceable to heat number, coating weight test reports, surface treatment verification, and export customs documents. Third-party inspection by SGS, BV, or TÜV is available upon request.
