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Hot Dip Galvanized Steel Coil
Standard: ASTM A653, EN 10346, JIS G 3302
Grade: DX51D, DX52D, S350GD, SGCC
Thickness: 0.12mm - 6.0mm
Width: 600mm - 1500mm
Zinc Coating: Z60 - Z275 g/m²
Shanghai Metal Corporation is a leading Hot Dip Galvanized Steel Coil manufacturer and supplier.
Hot Dip Galvanized Steel Coil is produced by passing cold-rolled steel through a molten zinc bath, creating a robust metallurgical bond between the steel and the zinc coating. This process provides superior corrosion resistance, making it ideal for applications exposed to harsh weather and moisture. The product is widely used in construction for roofing, wall cladding, and structural components, as well as in the automotive industry for body panels and chassis parts that require long-term durability. It effectively solves the problem of steel rust and degradation, significantly extending the service life of the final product.
If you want to know more about our steel products or Hot Dip Galvanized Steel Coil price please feel free to contact us, we will reply you within 24 hours.
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1. Base Steel: Typically cold-rolled steel coil providing the core strength and formability.
2. Zinc Coating: A layer of pure zinc or zinc-iron alloy applied via the hot-dip process. The coating weight determines the level of corrosion protection.
3. Spangle: The crystalline pattern on the surface, available as regular, minimized, or zero spangle.
4. Surface Treatment: Options include chromated, oiled, or unoiled finishes to prevent white rust during transport and storage.
5. Coil Dimensions: Standard inner diameter is 508mm or 610mm, with outer diameters up to 1800mm.
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1. Superior Corrosion Resistance
Zinc sacrificial anode prevents rust even if scratched; longer outdoor/humid life, less maintenance/replacement.
2. Excellent Formability
Based on high-quality cold-rolled or hot-rolled steel, the coil can be bent, stamped, and roll-formed into complex shapes without cracking the zinc layer. This allows for versatile fabrication in manufacturing and construction, enabling intricate designs and profiles.
3. Cost-Effectiveness
Durable, maintenance-free protection; lower upfront cost than stainless; economical for high-durability budgets.
4. Aesthetic Versatility
Various spangle sizes/surface treatments; final architectural element or paint base; flexible visual design for facades/products.
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1. Construction Roofing and Cladding
Used for corrugated roofing sheets, wall panels, and gutters in residential, commercial, and industrial buildings.Recommended with a minimized or zero spangle finish for a uniform painted surface.
2. Automotive Body Panels
Used for manufacturing underbody components, floor pans, and other parts prone to water and salt exposure.The galvanization prevents rust, enhancing vehicle safety, structural integrity, and resale value over its lifetime.
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1. Standard, steel grade & application:
|
Type |
Steel Quality |
Steel Grade |
Standard |
Equivelent Steel Grade |
Application |
|
low carbon steel and super low carbon steel |
commercial quality CQ |
DX51D+Z |
GB/T 2518-2008 |
SGCC |
general forming metal products |
|
DX51D+ZF |
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|
drawing quality DQ |
DX52D+Z |
SGCD1 |
drawing metal products |
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|
DX52D+ZF |
JAC270C |
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deep drawing quality DDQ |
DX53D+Z |
SGCD2 |
deep drawing metal products |
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|
DX53D+ZF |
JAC270D |
||||
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extra-deep drawing quality EDDQ |
DX54D+Z |
SGCD3 |
extra-deep drawing products |
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|
DX54D+ZF |
JAC270E |
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carbon structural steel and low alloy steel |
commercial quality high speed steel CQHSS |
S220GD+Z |
|
structural steel |
|
|
S250GD+Z |
SGC340 |
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S280GD+Z |
SGC400 |
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S320GD+Z |
SGC440 |
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S350GD+Z |
SGC590 |
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|
S550GD+Z |
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2. Mechnical property:
|
Steel Grade |
Yield strength MPA |
Tensile strength MPA |
Elongation A80mm% min |
180° Bending Test d=a |
|
DX51D+Z |
/ |
270-550 |
22 |
no drop |
|
DX52D+Z |
140-300 |
270-420 |
26 |
no drop |
|
DX53D+Z |
140-260 |
270-380 |
30 |
no drop |
|
DX54D+Z |
120-220 |
270-350 |
36 |
no drop |
3. Coating mass:
|
Zinc structure |
Zinc Sympol |
Min value for two sides g/m2 |
Density g/m2 |
|
|
at three ponit |
at one point |
7.1 |
||
|
pure zinc(z) |
Z100 |
100 |
85 |
|
|
Z140 |
140 |
120 |
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Z200 |
200 |
170 |
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|
Z225 |
225 |
195 |
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Z275 |
275 |
235 |
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Z450 |
450 |
385 |
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Z600 |
600 |
510 |
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4. Width tolerance:
|
Nominal width mm |
Allowed tolerance(mm) |
|||
|
PW.A |
PW.B |
|||
|
Min |
Max |
Min |
Max |
|
|
≥600-1200 |
0 |
5 |
0 |
2 |
|
＞1200-1500 |
0 |
6 |
0 |
2 |
5. Flatness:
|
Nominal width mm |
Flateness not more than /mm |
|||||
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PF.A |
PF.B |
|||||
|
Nominal thickness mm |
||||||
|
﹤0.7 |
≥0.7～1.2 |
≥1.2 |
﹤0.7 |
≥0.7～1.2 |
≥1.2 |
|
|
≥600～1200 |
12 |
10 |
8 |
5 |
4 |
3 |
|
≥1200～1500 |
15 |
12 |
10 |
6 |
5 |
4 |
|
≥1500 |
19 |
17 |
15 |
8 |
7 |
6 |
Standard Packaging
For Hot Dip Galvanized Steel Coil, we employ a multi-layer protection system to ensure the product arrives in perfect condition. Each coil is wrapped with VCI (Volatile Corrosion Inhibitor) anti-rust paper and a waterproof PE film to prevent moisture ingress and white rust during transit. The coil eyes are fitted with reinforced plastic or steel end caps to protect the inner diameter from mechanical damage. The standard coil ID is 508mm or 610mm, with an outer diameter (OD) typically ranging from 1000mm to 1800mm. Each coil, weighing from 3 to 10 MT, is securely fastened with at least three steel straps. The coils are then placed on fumigated wooden pallets or steel cradles for stability during loading and unloading.
Shipping
We support FCL and LCL sea freight, as well as break-bulk shipping for oversized orders. A standard 20' GP container can typically load 18–25 MT, while a 40' GP container can load 22–28 MT, subject to port and road weight limits. We accept common trade terms including EXW, FOB, CIF, and CFR. Shipping costs are calculated based on the cargo's volume, gross weight, destination port, and the selected transportation method. A full set of shipping documents is provided, including the Commercial Invoice, Packing List, Bill of Lading, Mill Test Certificate (MTC), and Certificate of Origin.
Lead Time
Samples: 3-7 working days
Standard orders: 15-25 working days
Customized orders: 25-40 working days
Q: What is the difference between Hot Dip Galvanized and Electro-Galvanized steel?
A: The primary difference is the coating thickness and process. Hot-dip galvanizing involves dipping steel in molten zinc, creating a thick, durable coating ideal for outdoor use. Electro-galvanizing uses an electrical current to apply a much thinner zinc layer, which is better suited for indoor applications or as a primer for painting, such as in automotive body panels.
Q: What information do you need to provide an accurate quotation?
A: To provide a precise quote, please specify the Standard (e.g., ASTM A653, EN 10346), Grade (e.g., DX51D, S350GD), Dimensions (Thickness x Width), Zinc Coating Mass (e.g., Z275), Spangle (Regular/Minimized/Zero), and Surface Treatment (Chromated/Oiled).
Q: Can you provide Mill Test Certificates (MTC)?
A: Yes, we provide Mill Test Certificates with every shipment. These documents verify the chemical composition and mechanical properties (Yield Strength, Tensile Strength, Elongation) against the ordered standard. Third-party inspections (e.g., SGS, BV) are also accepted upon request.
Q: What is spangle, and how does it affect the steel?
A: Spangle is the visible crystalline pattern of the zinc coating. It is purely aesthetic and does not affect the corrosion resistance or mechanical properties of the steel. Regular spangle has a distinct crystalline look, while minimized or zero spangle provides a uniform, smooth surface that is ideal for painting.
Q: How should I store galvanized coils to prevent white rust?
A: Coils should be stored indoors in a dry, well-ventilated area. If outdoor storage is unavoidable, they must be covered and elevated off the ground to prevent water accumulation. Avoid storing in environments with high humidity and poor air circulation, as this can lead to wet storage stain (white rust).
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