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Galvanized Steel sheet roll galvanized coil

Our galvanized steel coils are manufactured using continuous hot-dip galvanizing process, ensuring uniform zinc coating, strong adhesion, and excellent corrosion resistance.

Compared with ordinary GI products, our coils feature:

Stable zinc layer thickness with precise coating control
Strong surface adhesion, no peeling during bending
Smooth surface finish suitable for painting and forming
Consistent mechanical properties for roofing and profiling

Description

Product Name	Galvanized Steel Coil (GI)
Base Material	Cold Rolled Steel
Coating Process	Hot-Dip Galvanized
Zinc Coating	Z30 – Z275 g/m²
Thickness	0.12 – 4.0 mm
Width	600 – 1500 mm
Surface	Regular / Minimized / Zero Spangle
Standard	ASTM / JIS / EN

Grade correspondence table

China (GB)	Equivalent Grades	Key Advantages	Typical Applications
DX51D+Z	ASTM A653 CS Type B / SGCC	Excellent formability, strong coating adhesion, cost-effective	Roofing sheets, wall panels, ventilation ducts
DX52D+Z	ASTM A653 CQ / SGCD1	Improved deep drawing performance, smooth surface finish	Home appliances, stamping components
DX53D+Z	ASTM A653 DQ / SGCD2	Superior forming ability, stable mechanical properties	Automotive inner panels, complex formed parts
SGCC	ASTM A653 CS / DX51D+Z	Widely used commercial grade, consistent quality	Construction panels, light structural components
SGCH	ASTM A653 HSLAS / S350GD+Z	Higher strength, improved load-bearing capacity	Structural frames, purlins, industrial buildings
S350GD+Z	ASTM A653 Grade 50 / SGCH	High yield strength, excellent structural performance	Steel structures, roofing systems
Q195 + Z	ASTM A653 CS / SGCC	Economical, good ductility	Light fabrication, corrugated sheets
Q235 + Z	ASTM A653 SS / S235JR+Z	Balanced strength and weldability	Construction, general structural use

Zinc Coating & Corrosion Resistance

Zinc Coating	Approx. Thickness per Side	Corrosion Resistance Level	Typical Service Life*
Z30 (≈40 g/m²)	≈5–6 μm	Basic indoor protection	5–8 years (indoor environment)
Z60 (≈60 g/m²)	≈8–9 μm	Moderate corrosion resistance	8–12 years (mild environment)
Z80 (≈80 g/m²)	≈11–12 μm	Enhanced outdoor protection	10–15 years
Z120	≈17 μm	High corrosion resistance	15–20 years
Z180	≈25 μm	Very high protection level	20–25 years
Z275	≈38 μm	Maximum heavy-duty protection	25+ years (industrial / coastal areas)

*Service life depends on environmental conditions such as humidity, pollution, and coastal exposure.

Strict Quality Control System

Every galvanized steel coil undergoes systematic inspection to ensure coating stability, dimensional accuracy, and long-term corrosion resistance.

Zinc Coating Weight Test

Each batch is tested to verify zinc coating weight meets required Z standards, ensuring reliable corrosion protection.

Thickness Tolerance Inspection

Advanced measuring equipment guarantees accurate thickness control within international tolerance standards.

Surface Quality Examination

Manual and visual inspection ensures smooth surface finish without scratches, rust, oil stains, or coating defects.

Adhesion & Bending Test

Bending tests confirm strong bonding between zinc coating and steel base, preventing peeling during forming.

Mechanical Property Testing

Yield strength and tensile strength are tested to ensure suitability for roofing, panel forming, and structural applications.

Mill Test Certificate (MTC)

Official MTC including chemical composition and mechanical properties can be provided for every shipment.

Applications

Construction & Cladding

Primarily used for roofing and wall systems in large industrial plants and warehouses. Also commonly employed in building components such as roller doors, ventilation ducts, downpipes, and gutters.

Buildings are constantly exposed to wind, sun, and rain, demanding high weather resistance from materials. The zinc coating effectively resists corrosion from rainwater and atmospheric conditions, ensuring decades of structural service life and significantly reducing maintenance costs.
Automotive & Transportation

Galvanized steel coils are essential in modern automotive manufacturing. They are widely used in producing auto body panels (e.g., doors, hoods, trunk lids), chassis components, frames, and fuel tanks, as well as in the construction of truck and trailer bodies.

Vehicle chassis are highly susceptible to corrosive agents such as road moisture and de-icing salts. Galvanized steel effectively prevents rust, extends vehicle life, and enhances safety and resale value.
Household Appliances

Commonly used for outer casings and internal structural parts of refrigerators, washing machines, air conditioners, microwave ovens, and water heaters—particularly in components exposed to moisture, such as washing machine drums and outdoor AC unit housings.

Appliances require a clean appearance and long-term performance. Galvanized steel offers excellent corrosion resistance, and its smooth surface is ideal for painting and finishing, making it a preferred base material for household appliances.
Agriculture & Livestock

Used for panels and covers in agricultural machinery.

Fertilizers, pesticides, animal waste, and high humidity in agricultural environments accelerate metal corrosion. The high corrosion resistance of galvanized steel coils effectively withstands these chemical and biological factors, ensuring durable agricultural facilities and reducing replacement frequency.