Product Interview
Hot Dipped Galvanized Coil is made by passing pre-treated steel strip through molten zinc at 445–465°C, creating a metallurgically bonded dual-layer zinc coating.
It offers superior corrosion resistance, formability and surface consistency, and can be customized in coating weight, dimensions and surface finish to meet your specific needs.
| Material | SGCC, DX51D+Z, DX52D+Z, DX53D+Z, DX54D+Z, S220GD+Z, | |||
| Grade | Q235, Q345, SS400, ST37-2, ST52 | |||
| Standard | JIS, G3302, ASTM, A653M, EN10327, DIN17162 | |||
| Zinc coating | 40-600g/m2, according to customer's requirement | |||
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Thickness |
0.1-10mm or as required |
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Width |
50cm-2.2m or as required |
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Lenth |
Customized(1-30t/coil) |
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Tolerance |
±1% |
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Applications |
Automotive Manufacturing, Bridges, Electronic Appliances, Shipbuilding, Automobiles, Roofing, Elevator, Construction |
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Materials and Chemical Composition
The base material of the hot-dipped galvanized coil is mainly low-carbon steel. The core material complies with international and industry standards. Typical components are as follows (taking SGCC, DX51D, Q235 as examples)
| Element | C | M | P | S | Si | Fe | Zn |
| Content | ≤0.12% | ≤1.40% | ≤0.045% | ≤0.045% | ≤0.30% | Balance | above 99.9% |
Machanical Properties
The mechanical properties of hot-dip galvanized coil sheets are closely related to the type of base material and processing method. The following are the core indicators of the general specifications (customizable for high-strength levels):
| Performance | Yield strength | Tensile strength | Elongation rate | Hardness | Adhesion of zinc layer | Corrosion resistance |
| numerical range | 235-550 MPa | 370-700 MPa | ≥15%-30% | 80-150 HV | No zinc layer has peeled off. | Neutral Salt Spray Test (NSS) ≥ 500 hours (zinc coating thickness ≥ 80g/㎡) |
Perfect packaging and transportation :
Packaging Specifications- Waterproof film + winding film + protective plate + wooden base (fumigation allowed / fumigation prohibited), each roll is 2-5 tons and suitable for containers. Mode of transportation
Complementary services- handle customs declaration, inspection, and freight insurance, providing full guarantee for the logistics process.
Transport protection- Galvanized protective film + wooden support reinforcement + humidity monitoring to ensure the products remain intact during transportation
Delivery time-Standard products- 7-15 days; Customized products: 15-30 days; Urgent orders: can be delivered within 7 days.
Typical Applications
Widely used in construction, automotive, home appliances, machinery, municipal engineering, logistics and other fields, providing high-strength, corrosion-resistant structural and supporting parts for various industries.
• Construction & Building Materials
Used in steel structures, shelves, guardrails, color steel substrates, door and window frames, curtain wall keels and ventilation ducts.
• Automobile Manufacturing
Applied to automotive chassis, door frames, body substrates and anti-collision beam substrates.
• Home Appliances & Furniture
Suitable for refrigerator, air conditioner brackets, furniture metal frames and kitchen & bathroom hardware.
Product Features
High corrosion resistance-The zinc coating has strong adhesion with the base material, with an outdoor service life of 15-30 years, significantly reducing the maintenance cost in the later stage.
Comprehensive protection
The zinc liquid fully penetrates the entire surface of the base material, leaving no protection blind spots in corners, weld seams, etc.
Excellent processing performance
It can be directly bent, stamped, welded and other processed without damaging the integrity of the zinc layer, suitable for subsequent production.
High cost effectiveness
The cost of anti-corrosion per unit area is lower, no additional anti-corrosion treatment is required, and the production cycle is shortened.
Environmental compliance
The zinc layer is recyclable. The production complies with ISO 14001 standards, there is no heavy metal pollution, and it meets green procurement requirements.
Flexible specifications-Support customization of width, thickness, zinc layer thickness and surface condition, suitable for diverse procurement needs.
FAQs
Q：What zinc coating weight is best for my application?
Zinc coating (Z60–Z275) determines corrosion resistance; thicker coatings like Z275 suit outdoor/marine use, while thinner Z60–Z120 work for indoor forming parts.
Q：How long does hot dipped galvanized coil resist corrosion?
Service life ranges 10–50 years based on zinc thickness and environment; coastal/salty conditions need heavier coating to extend anti-rust life.
Q： Can HDG coil be bent, punched or deep drawn without cracking?
Qualified HDG coil with good spangle and ductility allows normal bending/punching; heavy coatings may need larger bending radii to avoid flaking.
Q:What's the difference between HDG and electro-galvanized coils?
HDG has a thicker, more durable metallurgical zinc layer for long-term outdoor corrosion protection, while electro-galvanizing offers thinner, smoother coating for indoor precision parts.
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