Galvanized Steel Coil — GI & Galvalume Solutions

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Explore Our Galvanized Steel Series

Galvanized and Galvalume steel coils are the backbone of modern construction and manufacturing, offering an exceptional balance of structural strength and environmental protection. Through a continuous hot-dip process, the cold-rolled steel substrate is coated with a protective layer—either pure zinc (GI) or an aluminum-zinc alloy (GL)—which acts as a sacrificial barrier against rust and corrosion.

At Luyuan Steel, we supply coils tailored to your exact industrial requirements, from ultra-thin 0.12mm roofing materials to robust 4.0mm structural grades. Our coils are certified to international standards (ASTM, EN, JIS) and are ready for further processing, roll-forming, or immediate application.

Galvalume Coil

Reliable galvalume steel coil with Z121–Z180 coating, 0.21–0.50 mm thickness, multiple grade options, and customizable length for fabrication and processing use.

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GI Coil

Reliable hot dip galvanized GI coil with Z120 coating, DX51D/SGCC grades, and customizable length for fabrication and processing use.

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Technical Specifications

Parameter	Specification
Product Name	Galvanized Steel Coil (GI) & Galvalume Steel Coil (GL)
Thickness Range	0.12 mm – 4.0 mm
Width Range	600 mm – 1,500 mm
Coating Weight	GI: Zinc Z40 – Z275 (g/m²) GL: Alu-Zinc up to AZ150 (g/m²)
Spangle Finish	GI: Regular / Minimized / Zero Spangle GL: Regular / Minimized / Zero / Big Spangle
Surface Treatment	Chromated / Oiled / Non-oiled / Anti-fingerprint (AFP) / Dry
Steel Grade	SGCC, DX51D, DX52D, DX53D, CGCC, G350, G450, G550, S350GD
Coil Inner Diameter	508 mm / 610 mm
Standard	ASTM A653 / EN 10346 / JIS G3302

Why Source Galvanized Steel from Luyuan?

Exceptional Corrosion Resistance

Whether you choose our Z275 heavily galvanized coils or our AZ150 galvalume coils, our products provide a reliable, long-lasting barrier against moisture and oxidation, extending the lifespan of your end products.
Wide Dimensional Range

We cater to diverse industrial needs by offering an extensive thickness range from ultra-thin 0.12mm up to heavy-duty 4.0mm, with widths customizable up to 1,500mm to minimize your material waste during processing.
Versatile Surface Finishes

We offer complete control over the aesthetic and functional finish of your steel. Choose from regular, minimized, or zero spangle, along with surface treatments like Anti-Fingerprint (AFP) to enhance handling and secondary coating adhesion.
High-Strength Structural Grades

Beyond standard commercial quality (DX51D/SGCC), we supply high-tensile structural grades (such as G550 and S350GD) specifically engineered for load-bearing applications like roofing purlins and steel framing.
Strict Quality Control

Every coil is produced under ISO 9001 standards and undergoes rigorous testing for coating adhesion, thickness tolerance (±5% or better), and mechanical properties. Full Mill Test Certificates (MTC) are provided.

Custom Galvanized Coils — Built to Your Specification

Every manufacturing process requires specific material properties. We offer comprehensive customization for your GI and GL coil orders:

Dimensions	Custom slitting for narrow widths; precise thickness tolerances
Coating Weight	Specified Z-coating or AZ-coating to match environmental demands
Spangle & Surface	Zero spangle for painting; AFP treatment for appliance manufacturing
Coil Weight & ID	Custom coil weights and 508mm/610mm inner diameters to fit your decoiler
Processing Services	Slitting, cutting to length, and protective packaging

Tell us your project requirements and we will provide a tailored solution.

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Applications of Galvanized & Galvalume Steel

Frequently Asked Questions

Should I choose Galvanized (GI) or Galvalume (GL) steel?

Galvanized steel (GI) is highly cost-effective and provides excellent protection for most standard construction and indoor applications. Galvalume (GL), with its aluminum-zinc coating, offers superior heat reflectivity and up to 6 times the corrosion resistance of GI in harsh, highly corrosive, or coastal environments.
What is the difference between regular, minimized, and zero spangle?

Spangle refers to the visible crystalline structure on the zinc surface. Regular spangle is standard and cost-effective. Minimized spangle has a finer, less visible pattern. Zero spangle is completely smooth, making it the ideal choice for applications where the steel will be painted or where a flawless surface appearance is required.
What is AFP (Anti-Fingerprint) treatment?

AFP is a specialized clear coating applied over the galvanized or galvalume surface. It prevents fingerprint smudges during handling, improves resistance to black rust, and provides an excellent primer-like surface for subsequent painting or adhesive applications.