Authentic Steel is the export department of Winroad Group, responsible for all international business. Established in Tianjin, China, we serve structural engineers, automotive manufacturers, roofing contractors, and steel stockists in 78+ countries. With strict quality management systems and advanced production lines, we supply hot rolled, cold rolled, metallic-coated, and pre-painted steel coils according to ASTM, EN, JIS, and GB standards. Whether you need commercial drawing qualities, high-tensile structural grades, or custom corrosion-resistant coatings, we provide complete steel coil solutions with mill-direct pricing and rapid dispatch from Tianjin Port.
Our inventory and custom processing capabilities cover every stage of steel coil manufacturing:
Produced by continuous hot-dip galvanizing.
Thickness: 0.1–3.5 mm
Width: 870–1250 mm
Zinc coating: 30–600 g/m²
Spangle: Big / Regular / Small / Zero Spangle
Coil weight: 3–24 MT
Coil ID: 508 / 610 mm
Applications: construction, HVAC ductwork, home appliances
Premium color-coated coils with flexible paint systems.
Thickness: 0.085–1.4 mm
Width: 900–1250 mm or as needed
Coil weight: 3–24 MT
Color: RAL code / sample color
Paint type: PE / SMP / HDP / PVDF
Top coating: 5–35 μm (common 15–35 μm)
Back coating: 5–20 μm
Coil ID: 508 / 610 mm
Finishes: standard RAL colors, wood grain, brick texture, anti-static architectural finishes
Coated with a 55% Al-Zn alloy layer for excellent heat reflectivity and corrosion resistance.
Thickness: 0.1–3.5 mm
Width: 870–1250 mm
Coating: 20–180 g/m²
Coil weight: 3–24 MT
Coil ID: 508 / 610 mm
Surface: regular or as needed
Heavy-duty structural steel coils and sheets.
Thickness: 0.8–19 mm
Width: 900–2000 mm
Length: 1000–12000 mm or as needed
Coil weight: 5–25 MT
Grades: Q195 / Q235B / Q345B / Q355B / SS400 / A36, etc.
Other surface: checkered
HRP&O (pickled & oiled) options available on request
High-precision coils with tight thickness tolerances and smooth surfaces.
Thickness: 0.1–2.5 mm
Width: 870–1250 mm
Surface: DC01 / SPCC-SD / Full Hard / Black Annealed
Coil weight: 3–25 MT
Coil ID: 508 / 610 mm
Applications: deep drawing, automotive stamping, general manufacturing
Next-generation alloy-coated coils for demanding environments.
Thickness: 0.3–3.5 mm
Width: 870–1250 mm
Coating: 30–450 g/m²
Coil weight: 3–24 MT
Coil ID: 508 / 610 mm
Applications: solar mounting brackets, agricultural infrastructure, marine environments
Thickness: 0.085–1.4 mm
Width: 900–1250 mm
Bundle weight: 2–5 MT
Type: corrugated sheets
Base materials: Galvanized / Galvalume / Zn-Al-Mg / PPGI / PPGL
Width: 30–870 mm
Thickness: 0.2–4.5 mm
Types: black annealed steel strip, bright steel strip, galvanized steel strip
Coil weight: 3–13 MT
Coil ID: 508 / 610 mm
We offer flexible, value-added processing services to meet exact project requirements:
General dimensions: Thickness 0.085–19 mm; width 30–2000 mm, depending on product.
Custom slitting & shearing: Narrow steel strip slitting down to 30 mm width and precision cut-to-length sheet processing.
Surface options: Anti-fingerprint (AFP), chromated, oiled / unoiled, skin-passed, and protective PVC film lamination.
Every steel coil batch undergoes comprehensive laboratory testing, including yield and tensile strength testing, zinc / paint coating thickness measurement, bend tests, and salt spray corrosion resistance verification. All shipments are supplied with an official EN 10204 3.1 Mill Test Certificate (MTC) and support independent third-party inspections by SGS, BV, or CCIC.
To reduce transit rust and physical damage during long-distance ocean shipping, our coils are packed with multi-layer seaworthy protection: anti-rust VCI paper, waterproof plastic film, galvanized steel outer casing, metallic edge protectors, and radial / circumferential steel banding on heavy wooden chocks.
Contact our engineering team for wholesale quotations, technical datasheets, or free A4 steel sample kits for your upcoming procurement project.
AUTHENTIC STEEL
Email: alice@authsteel.com
Mobile / Tel / WhatsApp: +86 137 8227 9845
Tianjin, China
