Hot-Dip Galvanized Steel Coils
Hot-Dip Galvanized Steel Coils
Hot-dip galvanized steel coils have a zinc coating bonded to the steel substrate through a hot-dip galvanizing process. The zinc coating provides two forms of protection: a physical barrier against the surrounding environment and sacrificial protection for the underlying steel.
Common applications include roofing sheets, wall cladding, steel structures, appliance housings, ventilation ducts, and general metal fabrication.
Key Product Characteristics
- Zinc Coating: Provides barrier protection and sacrificial corrosion protection for the steel substrate.
- Spangle Appearance: Regular spangle, minimized spangle, and zero spangle provide different galvanized surface appearances.
- Forming Applications: Galvanized steel coils are used for slitting, roll forming, stamping, and bending, depending on the selected grade and dimensions.
- Surface Treatments: Passivated, chrome-free passivated, oiled, lightly oiled, and dry finishes are common options for different storage and downstream processing requirements.
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02. Product Specifications & Selection
The main selection factors are the applicable standard, steel grade, thickness, width, zinc coating weight, and coil dimensions. These specifications determine whether the material matches the intended application and processing requirements.
| Specification | Common Options / Industry Reference |
|---|---|
| Product Type | Hot-Dip Galvanized Steel Coil (GI Coil) |
| Applicable Standards | EN 10346, ASTM A653, JIS G3302 |
| Steel Grades | DX51D, DX52D, SGCC, S250GD, S350GD |
| Thickness | 0.12–3.0 mm |
| Width | 610–1250 mm |
| Zinc Coating Weight | 40–275 g/m² |
| Coil Inner Diameter | 508 mm / 610 mm |
| Coil Weight | 3–8 MT |
| Spangle Types | Regular Spangle, Minimized Spangle, Zero Spangle |
| Surface Treatments | Passivated, Chrome-Free Passivated, Oiled, Lightly Oiled, Dry |
| Surface Processing | Skin-Pass, Non-Skin-Pass |
| Edge Condition | Mill Edge, Slit Edge |
Material Selection
- General Forming: DX51D is commonly used for general forming applications. DX52D is intended for more demanding drawing applications.
- Structural Applications: S250GD and S350GD are structural-grade options with specified strength requirements.
- Applicable Standard: EN 10346, ASTM A653, and JIS G3302 use different designation systems. Specify the required standard and grade together.
- Zinc Coating Weight: Select the coating weight according to the applicable standard and intended service environment. Confirm whether the specified value applies to both sides combined or to one side.
- Dimensions: Match thickness and width to the requirements of the intended forming, slitting, or fabrication process.
03. Specification & Processing Requirements
For a galvanized steel coil inquiry, specify the required dimensions, coating, surface condition, and material format.
Specification Options
- Thickness and Width: Specify the required dimensions according to the intended application and steel grade.
- Zinc Coating Weight: Identify the required coating weight and applicable standard.
- Spangle: Regular spangle, minimized spangle, or zero spangle.
- Surface Treatment: Passivated, chrome-free passivated, oiled, lightly oiled, or dry.
- Coil Dimensions: 508 mm or 610 mm inner diameter, where applicable, together with the required coil weight.
- Edge Condition: Mill edge or slit edge.
Processing Requirements
- Slitting: Divide master coils into narrower strips for downstream production.
- Cut-to-Length: Convert coil material into sheets of specified lengths.
- Skin-Pass: Specify skin-pass or non-skin-pass according to the required surface condition.
These details help define the required material format and processing specifications for an order.
04. Company & Order Support
Established in 2012, Shanxi Midas Industrial Co., Ltd. is engaged in the development, design, production, and sales of steel materials. Our business covers steel coils, steel plates, steel strips, and other steel products.
For purchasing projects, we provide:
- Product Consultation: Communication about material specifications, dimensions, and intended applications.
- Order Confirmation: Review of product details and purchasing requirements before proceeding.
- Progress Updates: Communication on order progress and inspection arrangements.
- After-Sales Support: Handling customer feedback and related service matters.
05. FAQ & RFQ
What is the difference between DX51D and DX52D?
DX51D is commonly used for general forming, while DX52D is intended for more demanding drawing applications. Select the grade according to the forming requirements and applicable standard.
How should I choose the zinc coating weight?
Select the coating weight according to the applicable standard and intended service environment. Specify whether the required coating mass applies to both sides combined or to one side.
What are the differences between regular spangle and zero spangle?
These are different galvanized surface appearances. Select the required finish according to the visual requirements of the final product and subsequent finishing process.
Can galvanized steel coils be processed into slit strips or sheets?
Slitting and cut-to-length are common processing options. Specify the required slit width or sheet length, edge condition, and dimensional tolerances when submitting your requirements.
What information is needed for a quotation?
Please provide the details available to you:
- Applicable standard and steel grade
- Required thickness and width
- Zinc coating weight
- Surface finish and treatment
- Coil inner diameter and coil weight
- Order quantity
- Intended application
- Destination port
Contact us with your galvanized steel coil requirements. We will review the product specifications and coordinate the quotation and order details.