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Hot Rolled Galvanized Steel Coil
1. Product Overview
Hot Rolled 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 excellent 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
Superior Corrosion Resistance:
High chromium (16-30%) and nickel (6-20%) content forms a self-healing passive layer, resisting rust, oxidation, and mild acids. 316 grades with molybdenum excel in chloride-rich environments like marine settings .
Excellent Processability:
Outstanding formability for bending, stamping, and deep drawing. Easy to weld without compromising structural integrity, ideal for complex components .
Versatile Performance:
Austenitic structure delivers high toughness even at low temperatures. Heat-resistant variants (e.g., 310S) withstand up to 1150°C, suitable for high-temperature equipment .
Quality & Customization:
Complies with ASTM/EN/JIS standards. Multiple surface finishes (2B, BA, HL, 8K) and customizable sizes (0.3-100mm thickness) meet diverse industrial needs .
Non-Magnetic & Durable:
Annealed state is non-magnetic, perfect for sensitive electronics. Low-carbon "L" grades (304L/316L) prevent intergranular corrosion post-welding .
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.
