Discover high-performance hot dipped galvanized steel coil (GI / Zinc Coated Steel Coil) solutions tailored specifically for structural roll-forming, industrial air duct systems, and commercial metal roofing fabrication.
Produced at our heavy industrial facilities in the port city of Tianjin by Winroad Group, these premium steel coils feature exceptional thickness consistency across a broad 0.1mm to 3.5mm processing window.
Our state-of-the-art continuous galvanizing lines apply a pure, highly uniform protective zinc layer ranging from Z30 up to heavy-duty Z600 g/m2, fully aligning with international metal standards like DX51D, SGCC, and ASTM A653. We guarantee complete procurement transparency by providing verified Mill Test Certificates (MTC) and fully supporting pre-shipment inspections by independent third-party agencies such as SGS or Bureau Veritas.
Navigating the international metal market requires partnering with galvanized steel coil suppliers who combine deep raw manufacturing scale with transparent technical certifications. Authentic Steel operates as the dedicated international branch of the Winroad Group, delivering direct mill access without broker inflation. Established in 1994, our Tianjin-based factories have spent over three decades refining the continuous hot-dip galvanizing process. This profound history allows us to support massive infrastructure projects, large-scale roofing sheet profiling operations, and regional wholesale networks across 78 countries with absolute delivery precision and predictable cost management.
Unlike simple trading agencies or brokers, our status among primary galvanized steel coil suppliers allows us to adjust dimensional and mechanical parameters to fit your automated manufacturing setups.
Flexible Thickness Matrix: Precision rolled from 0.1 mm up to 3.5 mm to match structural blueprints.
Advanced Slitting and Leveling: Converting wide master coils down into specific custom-width strips with zero edge curling.
Zinc Layer Adaptability: Ranging from 30 g/m2 up to an ultra-heavy 600 g/m2 for harsh marine or heavy agricultural projects.
Surface Visual Selections: Zero spangle for high-end paint bonding, or classic regular spangle for traditional industrial look.
What genuinely defines Authentic Steel among premium galvanized steel coil suppliers is our absolute refusal to skip quality verifications. Every production run undergoes online coating uniformity audits, microscopic surface checks, and thorough mechanical properties mapping. We accompany every invoice with authentic, complete Mill Test Certificates (MTC) stating exact chemical concentrations and stress tolerances, ensuring full compliance with international standards such as ASTM A653, JIS G3302, and EN 10346.
Our manufacturing facility sits in close proximity to the port of Tianjin, drastically reducing internal handling risks and ensuring fast scheduling onto container or bulk freight vessels. Our crews follow rigorous packing protocols, using heavy steel protective rings and waterproof outer shells to shield your metal from maritime salt air during the entire ocean voyage.
Export Sales Representative: Bella
Official Corporate Email: bella@authsteel.com / bella@wanlusteel.com
Direct Mobile & WhatsApp: +86 189 2041 0870
