DX51D Z275 Structural Galvanized Steel Coil for Construction
Galvanized Steel Coils are manufactured from premium steel sheet or cold-rolled steel coil with a protective zinc coating, offering excellent corrosion resistance for structural applications. Witop supplies galvanized steel coils in bulk with stable quality and reliable delivery.
Galvanized Steel Coil Features & Advantages
Reliable Zinc Coating Protection
Z30โZ275 coating ensures effective corrosion resistance for structural and roofing applications.
Stable Thickness & Surface Quality
Uniform coating and controlled tolerance support smooth roll forming and stamping.
Wide Grade & Specification Range
Available in multiple steel grades and widths to match diverse industrial requirements.
Strong Formability Performance
Good bending properties reduce cracking during fabrication.
Export-Ready Bulk Supply
Flexible MOQ, fast quotation and third-party inspection available for global buyers.
Dx51d z150 galvanized steel coil Description
DX51D Galvanized Steel Coil is produced from prime cold-rolled steel substrate with Z60โZ275 zinc coating, delivering outstanding corrosion resistance and extended service life. As a professional manufacturer and exporter, we supply bulk Hot-Dip Galvanized Steel Coil in thicknesses from 0.12โ4.0 mm and widths up to 1500 mm to meet diverse project and processing needs.
Widely applied in roofing sheets, duct fabrication, structural panels, and general construction, this product enables distributors and processing factories to reduce maintenance costs, improve durability, and ensure stable performance in humid and coastal environments.
DX51D Galvanized Steel Coil Applications
Galvanized steel coil is primarily used in structural and fabrication-focused industries where mechanical strength and cost efficiency are key.
Steel Structure Components
Used for purlins, studs and framing systems in commercial buildings.
HVAC & Ventilation Ducts
Preferred for air duct fabrication due to stable zinc coating and easy forming.
Automotive Inner Parts
Applied in non-exposed automotive components requiring moderate corrosion resistance.
Cable Trays & Electrical Enclosures
Suitable for indoor and semi-outdoor industrial installations.
Cold Roll Forming Production
Widely used as base material for further processing into roofing sheets and panels.
Z275 Galvanized Steel Coil Technical Sheet
| Galvanized Steel Coil Specification | |
| Standard | JIS G3302,ย EN10346,ย ASTM A653M |
| Grade | SGCC,SGCH,SGCD1,SGCD2, SGC -340,400,440,490,570 |
| DX51D, DX52D, DX53D, DX54D, S220GD, S250GD, S280GD, S320GD, S350GD, S450GD, S550GD | |
| CS Type A,B,Cย FS; Type A,B; DDS, EDDS; SS Grade 33,37,40,50,80 | |
| Zinc Coating | Z30-600G/M2 |
| Spangle Model | Zero Spangle, Small Spangle, Regular Spangle, Big Spangle |
| Surface Treatment | Chromated, Oiled, No-oiled |
| Hardness | Softy, Semi Hard, Full Hard, Drawing,Deep Drawing, Structural |
| Thickness | 0.11-5.00MM |
| Width | 600-1500MM |
| Coil Weight | 3-5MT/Coil or Customized |
| Coil Inner Diameter | 508MM or 610MM |
| Package | Standard Seaworthy Exporting Packing |
| MOQ | 25MT |
| Capacity | 7000MT/Month |
| Transport Type | Vessel Container, Vessel Bulk, Railway Container, Railway Wagon |
| Loading Port | Tianjin, Qingdao, Ningbo, Shanghai and other Chinaโs port |
| Delivery Time | 15-25 Days after Receiving the Deposit |
| Terms of Trade | EXW, FOB, CFR, CIF |
| Terms of Payment | T/T and Irrevocable LC at Sight |
Hot Dip Galvanized Steel Coil
| Specifications | GB T 2518 | JIS G 3302 | ASTM A653M | EN10346 | Application |
| DX51D | SGCCใSGHC | CS Type C | DX51D | Commercial | |
| DX52D | SGCD1 | CS Type A ใCS Type B | DX52D | Commercial Hard | |
| DX53D | SGCD2 | FS Type AใFS Type B | DX53D | Drawing, Class 1 | |
| DX54D | SGCD3 | DDS Type C | DX54D | Drawing, Class 2 | |
| DX56D | SGCD4 | DDS Type A | DX56D | Drawing, Class 3 | |
| DX57D | โ | EDDS | DX57D | Drawing, Class 4 | |
| S220GD | โ | SS230 [SS33] | S220GD | Structural Quality | |
| S250GD | SGC340 | SS255 [SS37] | S250GD | ||
| S280GD | SGC400 | SS275 [SS40] | S280GD | ||
| S320GD | โ | โ | S320GD | ||
| S350GD | SGC440 | SS340 [SS50] class 4 | S350GD | ||
| S550GD | SGC570 | SS550 [SS80] class 2 | S550GD | ||
| Coating Mass | Z30~Z600 | Z30~Z600 | Z90-Z600 | Z80~Z600 | โ |
| Surface Finish | Zero,Small,Regular,Large | ||||
| Surface Treatment | Chromating, Oiled, Skin-pass or Green Treatment | ||||
| Remarks | 1. Tolerance for thickness, width, flatness and so on conforms to individual product specification. | ||||
| 2. All products with thickness 2.0mm and under can be skin passed. | |||||
| 3. The coil inside diameter can be either 508mm or 610mm. The maximum coil outside diameter is 2000mm. | |||||
| 4. Please make inquiries to our Sales & Marketing Division for products with special specifications. | |||||
| 5. Coating mass beyond the specifications above can be provided by Witop Steel. upon mutual agreement between customers and us. |
|||||
Hot Dipped Galvanized Steel Coil Process Flow Chart
1. Pay Off
2. Welder
3. Entry Looper
4. Annealing Furnace
5.Zinc Pot / Aluzinc Pot
6. Spangle and Alloying Equipment
8. Coating Weight Control
9. Air Cooling
10. Coating Weight Measurement
11. Water Cooling
12. Skinpass Mill
13. Tension Leveler
14. Chemical Treatment
15. Delivery Looper
16. Surface Inspection
17. Oiler
18. Tension Reel
Packing Details
Standard export package: 3 layers of packing, inner side is anti-water craft paper, PVC plastic film is the middle and outer side covered by at least 0.45mm thick steel sheet,wrapped by minimum seven steel strapping strips with lock catch.
In particular, WITOP steel places desiccant on the coil inner core side and on both lateral sides of the coil for bulk transportation to ensure that coils are delivered to clients in good condition.
Package can be customized as client’s requirements.
Get Free Quote for Galvanized Steel Coil
FAQ โ Galvanized Steel Coil
Galvanized steel coil is cold-rolled steel coated with a protective layer of zinc through a hot-dip galvanizing process. The zinc coating protects the steel from corrosion and significantly extends its service life in outdoor and industrial environments.
Galvanized steel coil is widely used for:
Roofing sheet manufacturing
Steel structure components
HVAC ducts and ventilation systems
Automotive parts
Household appliances
Agricultural equipment
Industrial fabrication
Roofing sheet manufacturers and steel distributors are among the largest buyers of galvanized steel coils.
For roofing sheet production, the most common zinc coatings are:
Coating Typical Application
Z60 โ Z80 Low-cost roofing and indoor use
Z100 โ Z120 Standard roofing sheets
Z180 โ Z275 High corrosion resistance for outdoor roofing
Roofing sheet manufacturers in coastal or humid regions usually choose Z180โZ275 coatings.
The most common thicknesses for roofing sheet production are:
Thickness Typical Use
0.12 โ 0.18 mm Lightweight roofing panels
0.20 โ 0.30 mm Standard corrugated roofing
0.35 โ 0.50 mm Industrial and commercial roofing
Most roofing roll-forming machines process coils between 0.15 mm and 0.45 mm.
The main difference is the coating composition.
Material Coating Composition Main Advantage
Galvanized Steel (GI) Zinc Good corrosion resistance and lower cost
Galvalume Steel (GL) Aluminum + Zinc Better heat and corrosion resistance
Galvalume steel typically lasts 2โ4 times longer than standard galvanized steel in certain environments.
The service life depends on the zinc coating and environment.
Typical lifespan:
Indoor environment: 20โ50 years
Rural areas: 20โ30 years
Industrial or coastal areas: 10โ20 years
Higher zinc coatings significantly improve durability.
Most roofing sheet factories prefer coil weights between:
3 โ 5 metric tons per coil
Reasons:
Compatible with roll forming machines
Easy handling with small cranes
Efficient for continuous production
Some larger factories may use 5 โ 8 MT coils.
Yes. Galvanized steel coil is one of the most widely used materials for producing corrugated roofing sheets, trapezoidal roofing sheets, and roofing tiles.
The coil is processed through a roll forming machine to create roofing profiles.
Common surface finishes include:
Regular Spangle
Minimized Spangle
Zero Spangle
Anti-fingerprint
Oiled surface
Dry surface
Roofing sheet manufacturers usually prefer regular spangle or minimized spangle surfaces.
Common coil widths include:
Width Typical Use
914 mm Roofing sheet production
1000 mm General industrial use
1200 mm Sheet processing
1250 mm Wide sheet applications
Custom widths can also be produced based on processing requirements.
Yes. Galvanized steel coils are often used as the substrate for PPGI (Pre-painted Galvanized Steel Coil).
The coil is cleaned, chemically treated, and coated with paint to produce color coated steel.
Major buyers include:
Roofing sheet manufacturers
Steel distributors and wholesalers
Construction material suppliers
HVAC manufacturers
Appliance manufacturers
Industrial fabrication plants
Bulk buyers usually purchase 20โ200 tons per order.
Export packaging typically includes:
Waterproof paper
Plastic film protection
Galvanized steel outer sheet
Steel strapping
Wooden pallets or skids
Proper packaging prevents moisture damage and coil deformation during shipping.
Common international standards include:
ASTM A653 (USA)
EN 10346 (Europe)
JIS G3302 (Japan)
GB/T 2518 (China)
Different markets may require different standards.
Key factors include:
Stable zinc coating quality
Accurate thickness tolerance
Consistent coil weight
Export packaging experience
Reliable delivery time
Ability to supply bulk orders
Many distributors prefer working with direct manufacturers rather than trading companies.
