Description
Factory-direct cold rolled galvanized steel sheet — every coil shipped with original mill test certificates covering DX51D through S550GD chemistry and zinc coating weight.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM Galvanized Steel Sheet |
| Product Type | Steel Sheet / Steel Coil |
| Steel Grade | DX51D, DX52D, DX53D, DX54D, S220GD, S250GD, S280GD, S350GD, S550GD, SGCC, SGHC, SGCH, SGH340, SGH400, SGH440, SGH490, SGH540 |
| Standard | ASTM A653, JIS G3302, EN 10143, AISI, DIN, GB |
| Thickness | 0.12mm–6.00mm |
| Width | 600mm–1500mm |
| Zinc Coating | Z30–Z275 (30g–275g/m²) |
| Spangle Type | Zero Spangle / Small / Regular / Big Spangle |
| Surface Treatment | Passivation, Oiling, Lacquer Sealing, Phosphating, Anti-fingerprint |
| Technique | Cold Rolled / Hot Rolled, Hot-Dip Galvanized |
| Coil ID | 508mm / 610mm |
| Coil Weight | 3–20 metric tons per coil |
| Tolerance | ±5% |
| Hardness | Mid Hard |
| Skin Pass | Yes |
| Processing Service | Welding, Punching, Cutting, Bending, Decoiling |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Building & Construction | Roofing sheets, indoor and outdoor structural panels, scaffolding platforms |
| Infrastructure | Perimeter fencing, greenhouse frame structures, container body manufacturing |
| Industrial Fabrication | Cutting blanks for small tools, corrugated sheet production, low-pressure pipe manufacturing |
What Zinc Coating Weight Decides Before Customs Clearance
A Z275 sheet cleared as Z120 will fail third-party inspection at destination port and trigger full-container rejection.
Global buyers sourcing cold rolled galvanized steel sheet repeatedly face quality uncertainty at the discharge port. Independent lab tests reveal zinc coating weights falling below contract specifications, and missing or incomplete mill test certificates cause customs holds that delay project timelines by weeks. When galvanization thickness does not match the declared standard, corrosion appears within months rather than years, and structural components in humid or coastal environments degrade prematurely [NEED_CITE: hot-dip galvanized coating thickness measurement standards per ASTM A653].
Matching Coating Weight and Spangle to Corrosive Environments
Selecting the right zinc coating range from Z30 to Z275 determines service life in specific atmospheric conditions. Zero spangle and small spangle finishes provide uniform surfaces ideal for painting or powder coating in architectural roofing applications, while regular and big spangle patterns suit industrial fencing and greenhouse structures where appearance is secondary. Cold rolled base material with skin pass treatment ensures flat coil surfaces and consistent thickness tolerance across the full 0.12mm to 6.00mm range, which matters when sheets feed automated roll-forming lines producing corrugated roofing or container panels.
Structural Compliance and Certification Requirements
Engineering specifications for building frames, scaffolding systems, and container structures require documented proof that galvanized steel sheet conforms to declared standards. ASTM A653 governs North American procurement, EN 10143 applies to European tolerance classes, and JIS G3302 covers Japanese-spec orders. Surface treatment selection — passivation, oiling, lacquer sealing, phosphating, or anti-fingerprint — must align with the downstream forming process and final environment. Welding, punching, cutting, and bending services reduce secondary processing costs at destination, while decoiling supports coil-fed production lines [NEED_CITE: tolerance class requirements for cold-formed steel sheet per EN 10143].
Steel Grade Selection Across DX and S Series
The DX series grades — DX51D through DX54D — represent increasing formability levels, where DX51D suits general profiling and DX54D handles deep drawing for complex container components. The S series structural grades — S220GD through S550GD — provide defined minimum yield strength for load-bearing applications such as greenhouse frames and scaffolding. SGCC and SGCH cover commercial and hard quality levels for light-gauge roofing, while SGH340 through SGH540 serve higher-strength structural requirements. Hot-dip galvanizing bonds zinc metallurgically to the cold rolled substrate, creating a corrosion barrier that outperforms electroplated alternatives in outdoor and high-humidity conditions [NEED_CITE: steel grade equivalence mapping between ASTM A653 and EN 10142 systems].
Hidden Costs of Under-Specified Galvanization
Ordering Z30 coating for a coastal roofing project that requires Z275 accelerates corrosion onset and triggers premature replacement cycles. Missing mill test certificates prevent customs clearance in markets requiring documented proof of coating weight and chemical composition. Thickness tolerance exceeding ±5% causes roll-forming misfeeds and material waste on high-volume production runs. When third-party inspection reveals coating weight below contract, the buyer bears return shipping, replacement production, and project delay costs — expenses that dwarf the initial price difference between coating grades [NEED_CITE: consequences of non-conforming galvanized coatings in structural applications].
Procurement Confidence Through Verified Documentation
Every batch of cold rolled galvanized steel sheet ships with original mill test certificates documenting chemical composition, coating weight, and dimensional tolerance per the declared standard. SGS and BV third-party inspection is available before container sealing, providing independent verification for project compliance. Factory-direct pricing eliminates intermediary markups, and volume discount programs reward long-term procurement partnerships. Professional export documentation covers packing lists, bills of lading, and certificates of origin, while container loading optimization maximizes payload for 600mm to 1500mm width coils weighing 3 to 20 metric tons each.
Documentation & Compliance
- Mill test certificate documenting DX51D or S280GD chemical composition, zinc coating weight per Z30–Z275 specification, and dimensional tolerance per ASTM A653 or EN 10143
- CE certificate confirming compliance with EN 10143 tolerance classes for cold-formed galvanized sheet and strip products
- ISO 9001:2015 quality management certificate covering production processes and inspection protocols
- SGS or BV third-party inspection report verifying zinc coating thickness, surface treatment type, and coil dimensions before shipment
- Material traceability by heat number linking each coil to its production batch and original slab chemistry
- Complete customs documentation including packing list, bill of lading, and certificate of origin for destination port clearance
Packaging, Loading & Delivery
- Cold rolled galvanized steel sheet coils bundled with steel strips and edge protectors to preserve zinc coating integrity during ocean transit
- Surface protection through passivation or oiling treatment applied per buyer specification to prevent white rust formation during storage and shipping
- Container loading optimization for 508mm and 610mm coil ID configurations, maximizing payload within standard 20ft and 40ft shipping containers
- Custom cutting and decoiling services available to deliver sheets in exact dimensions, reducing on-site waste for roofing and container manufacturing applications
- Heat number and steel grade identification marked on each coil for traceability and site verification upon arrival
- FOB, CIF, and DDP shipping terms available with professional logistics coordination from Shandong port to destination worldwide
Initiating Your Procurement Inquiry
Submit your required specifications including steel grade, thickness, width, zinc coating weight, surface treatment preference, and destination port to receive a competitive quotation with volume pricing. Mill test certificates and third-party inspection options are confirmed at the quotation stage. Non-standard dimensions and custom processing requirements are reviewed for feasibility and lead time within typical production cycles.
Frequently Asked Questions
Q: What is the difference between zero spangle and regular spangle galvanized steel sheet?
A: Zero spangle and small spangle finishes produce a uniform, smooth surface ideal for applications requiring painting or powder coating, such as architectural roofing panels. Regular and big spangle patterns display visible crystalline formations and suit industrial applications like fencing and greenhouse structures where surface appearance is not critical. Both options are available across the Z30 to Z275 zinc coating range.
Q: Can you provide mill test certificates and third-party inspection for customs clearance?
A: Every batch of cold rolled galvanized steel sheet ships with original mill test certificates documenting chemical composition, zinc coating weight, and dimensional measurements per the declared standard. SGS and BV third-party inspection is available upon request before container sealing, providing independent verification for destination port customs requirements.
Q: What is the MOQ for custom thickness and width specifications?
A: The minimum order quantity is 5 tons. Standard specifications within the 0.12mm to 6.00mm thickness and 600mm to 1500mm width range are available from ready stock. Custom dimensions outside standard catalog sizes require production scheduling with typical lead times confirmed at the quotation stage.
Q: How do you optimize container loading for galvanized steel coils and sheets?
A: Container loading plans are developed based on coil weight (3 to 20 metric tons), coil ID (508mm or 610mm), and width to maximize payload within standard shipping container dimensions. Professional export teams coordinate loading sequences and securement to prevent coil shifting and zinc coating damage during ocean transit.
Q: What surface treatment options are available for different application environments?
A: Five surface treatment options are available: passivation for general corrosion resistance, oiling for temporary protection during storage and transit, lacquer sealing for enhanced durability, phosphating for improved paint adhesion, and anti-fingerprint treatment for applications requiring frequent handling. Treatment selection depends on the downstream forming process and final service environment.
Request Your Quotation with Mill Test Certification
Submit your cold rolled galvanized steel sheet specifications including steel grade, dimensions, zinc coating weight, and destination port to receive factory-direct pricing with complete documentation.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxinjiyuan.com
