Hot Dipped S320 GD Cold Rolled Galvanized GI Carbon Steel Coil for Sales
Galvanized coil are thin steel substrates protected with a zinc layer by dipping into molten zinc. Most commercial output comes from continuous hot‑dip galvanizing: rolled steel strip feeds steadily through a bath of liquid zinc to create regular galvanized sheet products.
Alloy‑coated galvanized sheet also uses the hot‑dip method. As soon as the material leaves the zinc bath, it gets heated to around 500 °C, developing a zinc‑iron alloy surface finish. This product grade boasts solid coating bonding performance and good weldability.
Galvanized coils are grouped into two main types: hot‑rolled galvanized coils, and cold‑rolled galvanized coils . These materials are widely adopted in construction, home appliance, automotive, container, transport and consumer‑goods industries. Typical projects cover steel‑structure buildings, auto production and steel warehouse fabrication. Construction and light‑industry customers make up the biggest end‑market, taking up about 30% of overall galvanized sheet consumption.
Corrosion Resistance
Hot‑dip galvanizing delivers a cost‑effective way to guard steel against rust, and roughly half of global zinc output goes toward this application. Zinc creates a compact protective film over the steel surface and provides cathodic sacrificial protection. Even if the zinc coating gets scratched or damaged, it will continue to shield the base iron‑steel substrate from corrosion.
Favourable Cold Bending & Weldability
These coils are primarily produced from low‑carbon steel grades. The base material is formulated to perform well during cold bending and welding, while also meeting basic stamping requirements for fabrication work.
High Reflective Property
Its surface offers high light‑heat reflectivity, so the material can act as an effective thermal barrier.
High‑Toughness Coating
The zinc layer develops a unique metallurgical microstructure. This robust coating can stand up to mechanical knocks and abrasion encountered during transit and on‑site service.
Galvanized steel coil is widely used where corrosion resistance, durability, formability, and low maintenance are required. Common applications include:
Construction: Roofing sheets, wall panels, siding, ceiling systems, steel framing, purlins, and structural components
Automotive: Vehicle body panels, chassis components, doors, hoods, and underbody parts
Appliances: Refrigerator panels, washing machines, air-conditioner housings, and other household appliances
HVAC Systems: Air ducts, ventilation components, and equipment housings
Electrical & Industrial: Cable trays, electrical cabinets, control panels, and equipment enclosures
Agriculture: Grain storage systems, farm buildings, silos, and agricultural equipment
Solar Projects: Solar mounting structures, brackets, and support components
Manufacturing: Fabricated parts, metal containers, shelving, and general-purpose industrial components
Typical downstream products: Galvanized roofing sheets, corrugated sheets, C/Z purlins, HVAC ducts, automotive components, and fabricated steel parts.
| Item | Details |
| Applicable Standards | ASTM, EN, JIS, GB |
| Grades | DX51D, DX52D, DX53D, DX54D, S220GD, S250GD, S280GD, S350GD, S550GD; |
| SGCC, SGHC, SGCH, SGH340, SGH400, SGH440, SGH490, SGH540, SGCD1, SGCD2, SGCD3, SGC340, SGC490, SGC570; | |
| SQ CR22(230), SQ CR22(255), SQ CR40(275), SQ CR50(340), SQ CR80(550), CQ, FS, DDS, EDDS, SQ CR33(230), SQ CR37(255), SQCR40(275), SQ CR50(340), SQ CR80(550); | |
| Custom grades available upon client request | |
| Thickness | 0.10‑2 mm, customisable to match project requirements |
| Width | 600‑1500 mm, adjustable per customer specifications |
| Manufacturing Process | Hot‑dipped galvanized |
| Zinc Coating Weight | 30‑275 g/m² |
| Surface Treatment Options | Passivation, oiling, lacquer sealing, phosphating, no treatment |
| Surface Finish | Regular spangle, minimal spangle, bright finish |
| Coil Weight | 2‑15 metric tons per coil |
| Packaging | Inner layer: waterproof paper; |
| Outer layer: galvanized / coated steel sheet with side protection plates, secured with seven steel straps. | |
| Custom packaging solutions are also acceptable. | |
| Typical Applications | Building structures, steel gratings, hardware tools |
1. What is S320GD galvanized steel coil?
S320GD is a popular structural galvanized steel grade governed by the EN 10346 standard, featuring a minimum yield strength of 320 MPa. Boasting stable mechanical performance and excellent corrosion resistance, it is extensively applied in building construction, structural parts, roofing systems and various industrial fabrication projects.
2. What industry standards does S320GD comply with?
This steel coil is strictly produced in line with EN 10346 specifications. To guarantee product quality, we can provide official Mill Test Certificates (MTC) and complete quality inspection documents to support customers’ order clearance and project acceptance.
3. What standard sizes are available for S320GD Cold Rolled Galvanized Steel Coil?
Our regular production range covers a thickness of 0.50 mm to 3.00 mm, with a maximum width of 1520 mm. We can adjust specific dimensions based on factory production capacity and customers’ actual project needs, and support customized size processing.
4. What zinc coating grades can be selected?
We offer multiple conventional zinc coating options including Z100, Z120, Z180, Z275 and Z350. Customers can choose the appropriate coating weight according to the on-site environment and anti-corrosion demands of their projects.
5. What are the main application scenarios of S320GD galvanized steel coil?
S320GD is widely used for manufacturing steel roof sheets, wall cladding panels, C/Z purlins, building structural frames, solar mounting brackets, HVAC system components, industrial equipment accessories and various custom fabricated steel parts.
6. Is customized production available for S320GD galvanized coils?
Yes, full customization is supported. We can tailor product thickness, width, zinc coating weight, coil weight, surface treatment methods, packaging solutions and delivery standards to meet customers’ personalized project requirements.
7. What is your export packaging method for S320GD coils?
We adopt professional seaworthy export packaging. Each coil is wrapped with waterproof paper as the inner layer, covered with galvanized protective steel sheets on the outer layer, and firmly fixed with steel straps. This standardized packaging effectively prevents moisture, corrosion and mechanical damage during long-distance marine transportation.
8. What export documents can you provide?
We can supply a complete set of export documents, including mill test certificates (MTC), SGS inspection reports (on request), packing lists, commercial invoices, certificates of origin and other customized supporting documents to meet customers’ customs clearance requirements.
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