Grade: High-Tensile Structural GI Coil (S350GD+Z / ASTM A653 Gr.50)
Yield Strength : High load-bearing yield strength for heavy purlins & decking.
Zinc Protection: Z40 - Z600 heavy sacrificial coating for zero structural rust.
Certification: Full EN 10204 3.1 Mill Test Certificate (MTC) & SGS/BV inspection ready.
Regular spangle galvanized steel coil :
When structural safety factor parameters cannot be compromised, our Structural Grade Galvanized Steel Coil delivers exceptional yield strength paired with thick cathodic zinc protection. Manufactured under rigorous heat-treatment protocols, this high-tensile material provides the precise structural stiffness required for heavy civil infrastructure, industrial framing, and high-load architectural deckings.high quality galvanized steel coil,2026 Hot Sell Galvanized Steel Coil,gi coil hs code,regular spangle galvanized steel .
With over three decades of continuous metallurgical refining and two decades of international export experience, our mill controls the carbon-manganese matrix to perfection. This ensures that high yield strength is achieved without sacrificing cut-edge ductility or weldability, providing engineers and contractors with guaranteed performance under extreme static and dynamic loads.high quality galvanized steel coil,2026 Hot Sell Galvanized Steel Coil,gi coil hs code,regular spangle galvanized steel .
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Technical Parameter |
Specification & Manufacturing Range |
|
Structural Grade Standard |
S350GD+Z, S450GD+Z, S550GD+Z, ASTM A653 Structural Steel Grade |
|
Yield Strength ($R_e$) |
350 MPa - 550 MPA |
|
Tensile Strength ($R_m$) |
420 MPa - 650 MPa |
|
Thickness Scope |
0.10 mm – 3.50 mm |
|
Zinc Coating Weight |
Zinc Layer Z30 Z180, Z275, Z350, Z600 |
|
Bending Radius |
Cold bend test certified with zero base metal fracture |
|
Mill Certification |
Full compliance with EN 10204 3.1 MTC; EN 10346 certified |


We provide global clients with stable supplies, rigorous quality control, and customized solutions. For inquiries or quotations, please contact us:
Sales Specialist : Ms. Lina
Email: lina@authsteel.com
Phone: +86-137 5206 8850
WhatsApp: +86-137 5206 8850
We will respond within two working hours with professional advice and a quotation.
regular spangle galvanized steel coil