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Cold Rolled Galvanized Steel Coil
1. Product Overview
Galvanized steel coil is a protective steel product manufactured by applying a zinc coating onto cold-rolled or hot-rolled steel coil through continuous hot-dip galvanizing process. The zinc layer forms a metallurgical bond with the steel substrate, providing long-lasting corrosion protection. With flexible specifications, good processability, and excellet protective performance, it serves as an important raw material for construction, home appliances, automotive, and light industries, suitable for direct processing or use after slitting.
2. Key Features
（1）Excellent Corrosion Resistance Life
The hot-dip zinc coating provides reliable barrier protection and cathodic protection for the steel coil. When damaged, the zinc layer continues to protect the substrate through sacrificial anode action. Depending on zinc coating thickness, service life can reach 10-50 years, significantly reducing maintenance costs.
（2）Superior Processability and Formability
Galvanized steel coil maintains the good mechanical properties of the base material, suitable for various cold processing including stamping, bending, and stretching. The zinc coating exhibits excellent adhesion and flexibility, preventing peeling or cracking during processing, meeting complex part manufacturing requirements.
Keywords: easy processing galvanized coil, high formability, complex part manufacturing, cold processing suitable, good coating adhesion.
（3）Uniform Zinc Coating and Consistent Quality
Advanced continuous hot-dip galvanizing process ensures uniform zinc coating thickness and stable surface quality. Automated production lines guarantee consistent batch-to-batch performance, providing reliable assurance for subsequent automated processing.
（4）Cost-effective and Environmentally Sustainable
Compared to other anti-corrosion steels, galvanized steel coil offers significant cost-performance advantages. The recyclability and long-life characteristics of zinc make it an environmentally friendly choice, complying with green building and sustainable development requirements.
3. Technical specification
Parameter | Specification Range | Standard / Notes |
Steel Grade | DX51D, DX52D, DX53D, SGCC, SQ CR1-CR5 | EN 10346, ASTM A653, JIS G3302 |
Thickness | 0.12mm - 3.0mm | ±0.03mm tolerance |
Width | 600mm - 1500mm | Custom widths available |
Zinc Coating Mass | Z60 - Z275 (60-275 g/m²) | Double side total |
Coating Type | Regular Spangle, Minimal Spangle, Zero Spangle | Surface appearance |
Surface Treatment | Chromated, Oiled, Untreated | Chemical treatment |
Tensile Strength | 270 MPa - 800 MPa | ASTM A370 |
Yield Strength | 140 MPa - 550 MPa | ASTM A370 |
Elongation | 18% - 35% | in 50mm |
Hardness | 50 HRB - 95 HRB | Rockwell B Scale |
Coil ID | 508mm, 610mm | Standard |
Coil OD | 1000mm - 1800mm | Maximum 2000mm |
Coil Weight | 3-15 tons | Maximum 20 tons |
Flatness | ≤3mm/m | For thickness ≥0.5mm |
Camber | ≤1mm/m | Edge straightness |
4. Application Scenarios
(1)Building Envelope and Structural Systems
Used as substrate for color coated sheets, roofing panels, wall panels, purlins, and other building components. The zinc coating provides long-term corrosion protection, ensuring building durability in humid environments while meeting modern construction requirements for material lightweight and construction efficiency.
(2)Home Appliance and Electronic Enclosure Manufacturing
Applied in refrigerator, air conditioner, washing machine housings, and electrical control boxes, cabinets. Good formability and surface quality meet appliance requirements for precision and appearance, while zinc coating ensures product reliability in humid environments.
(3)Automotive and Transportation Components
Used for automotive body parts, chassis components, fuel tank housings, and other auto parts. The strength and corrosion resistance of galvanized steel coil meet the automotive industry's strict requirements for safety and durability, supporting vehicle lightweight development.
5. FAQs
Q1: How should the zinc layer code of galvanized steel coils be interpreted?
A1: Z represents zinc coating, numbers indicate total double-side zinc coating weight (g/m²). For example, Z120 means total double-side zinc coating weight 120g/m², typically single-side coating is about 60g/m².
Q2: Can galvanized steel coils be welded? What precautions should be taken?
A2: Yes, but requires special processes. Recommend gas shielded welding, remove zinc coating from welding area before welding, control heat input, clean weld seam promptly after welding to ensure quality and avoid zinc fume hazards.
Q3: What are the differences between galvanized steel coils with different surface treatments?
A3: Regular spangle for general use, minimal spangle for painting, spangle-free for high-end appliances and automotive. Chromate passivation offers better corrosion resistance, oiling benefits short-term rust prevention and forming.
If you want to know more, please feel free to contact us.
