Product Specification
| Item | Description |
|---|---|
| Product Name | Hot-Dip Galvanized Steel Coil (GI Coil) |
| Steel Grade | DX51D+Z (EN 10346) |
| Coil Weight | 3–8 tons, or as per customer requirement |
| Spangle Type | Regular Spangle |
| Thickness | 0.10 – 3.00 mm |
| Zinc Coating | 40 – 275 g/m² |
| Width | 900 – 1250 mm |
| Length | As per customer's request |
| Surface Treatment | Chromated / Oiled / Dry (Optional) |
| Application | Roofing, construction, building materials, containers, etc. |
Product Features
Excellent Corrosion Resistance
Hot-dip galvanized steel coils are coated with a protective zinc layer that effectively prevents rust and corrosion, even in humid or harsh outdoor environments.
Long Service Life
The zinc coating significantly extends the lifespan of the steel, reducing maintenance costs and minimizing the need for frequent replacement.
High Durability
GI steel coils offer strong resistance to mechanical stress, impact, and wear, making them suitable for demanding industrial and structural applications.
Wide Application Versatility
Galvanized steel is widely used across construction, automotive, agriculture, electrical, and manufacturing industries due to its balanced strength and corrosion protection.
Attractive Surface Appearance
With a clean, bright, and uniform spangle finish, galvanized steel coils provide an aesthetically pleasing surface for visible applications.
Good Weldability
GI steel can be welded using standard welding methods. Proper ventilation and surface preparation are recommended to ensure weld quality.
Application Fields
Construction Industry
Used for roofing sheets, wall cladding, structural components, purlins, and building frameworks due to its strength and corrosion resistance.
Automotive Industry
Applied in vehicle body panels, chassis parts, and structural components to improve rust resistance and service life.
Agricultural Use
Ideal for barns, fences, storage facilities, farming equipment, and outdoor structures exposed to weather conditions.
Manufacturing Industry
Widely used for machinery components, enclosures, containers, and parts requiring durability and corrosion protection.
Electrical Industry
Used in cable trays, conduits, and electrical enclosures to protect wiring systems from environmental damage.
Water Transportation Systems
Galvanized pipes and components are commonly used for water transport and drainage systems due to their corrosion resistance.
Q1: What is DX51D+Z in coil form, and what are its key characteristics?
A: DX51D+Z coil refers to a continuous-length, hot-dip galvanized steel coil delivered in coil form. It is a cold-forming, drawing-quality steel with a pure zinc coating (Z). The "D" indicates its suitability for deep drawing, and the coil form enables efficient, high-volume roll-forming, stamping, or blanking in continuous production lines.
Q2: What are the standard specifications for DX51D+Z coil?
A:
Standard: EN 10346 (Continuously hot-dip coated steel flat products).
Base steel grade: DX51D (non-alloy, drawing quality).
Coating: Zinc coating (+Z), typically designated by coating mass (e.g., Z100, Z140, Z200, Z275).
Surface treatment: Usually chromate-free passivation (+ZM) or oiled to prevent white rust.
Coil dimensions:
Thickness: 0.3 mm to 3.0 mm (commonly).
Width: 600 mm to 1,650 mm (can be slit to narrower widths).
Coil ID (inner diameter): 508 mm or 610 mm.
Coil OD (outer diameter): Up to 1,800 mm depending on weight.
Coil weight: Typically 3 to 20 metric tons (can vary per mill capability).
Q3: How does coil form differ from sheet form in practical use?
A:
Coils are used in automated, continuous processing lines (e.g., roll-forming for roofing, profiling, tube-making, or stamping). This reduces material handling, increases throughput, and minimizes yield loss.
Sheets (cut-to-length from coil) are used for discrete part fabrication where blanks are needed.
Coils require uncoiling, leveling, and cutting equipment, while sheets are ready for press-brake or manual fabrication.
Q4: What are typical coating mass options for DX51D+Z coil?
A: The coating mass (total both sides) defines corrosion resistance:
Z100 (100 g/m²): Light service, interior applications.
Z140 (140 g/m²): Standard for construction panels, general fabrication.
Z200 (200 g/m²): Heavy-duty for industrial or outdoor exposure.
Z275 (275 g/m²): Extra-heavy for aggressive environments (e.g., coastal, chemical).
Q5: What surface finishes are available for DX51D+Z coil?
A: Common surface designations:
Standard spangle (Z): Visible zinc crystallization pattern.
Minimized spangle (ZM): More uniform surface for painting.
Smooth (compatible with +ZF): Rolled after coating for a smooth, paint-ready surface.
Passivated (+ZM):
