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Galvanized Flat Steel - ASTM Certified Mill Direct Manufacturer
China
Supplier's customization ability
- Drawing-based customization
- Sample-based customization
- Full customization
Minimum order quantity: 1 ton
Shipping total: To be negotiated
- Lead time:
- confirmed with the quotation
- Packaging:
- standard export packing
- Samples:
- available on request
Product details
Technical Specifications of Galvanized Flat Steel
| Property | Parameter | Description |
|---|---|---|
| Product Name | Galvanized Flat Steel | Hot-dip galvanized flat steel bar for structural and industrial use |
| Base Material Grade | Q235B / SS400 / A36 / S235JR | Equivalent grades across GB, JIS, ASTM, and EN standards |
| Standard Compliance | ASTM A653, EN 10346, GB/T 704, JIS G3302 | International standards for galvanized flat steel products |
| Carbon (C) | ≤ 0.20% | Ensures good weldability and formability |
| Manganese (Mn) | ≤ 1.40% | Enhances strength and toughness of base metal |
| Phosphorus (P) | ≤ 0.045% | Controlled to prevent cold brittleness |
| Sulfur (S) | ≤ 0.045% | Minimized to improve ductility and surface quality |
| Silicon (Si) | ≤ 0.35% | Acts as deoxidizer during steelmaking |
| Tensile Strength | 370 – 500 MPa | Per ASTM A36 / GB/T 700 requirements |
| Yield Strength | ≥ 235 MPa | Minimum yield point for structural applications |
| Elongation | ≥ 26% | Measured on standard gauge length of 50 mm |
| Thickness Range | 3 – 60 mm | Customizable per customer specification |
| Width Range | 20 – 200 mm | Standard and non-standard widths available |
| Length Range | 6,000 – 12,000 mm | Cut-to-length service available upon request |
| Zinc Coating Thickness | 45 – 85 μm (≥ 275 g/m²) | Hot-dip galvanized per ASTM A123 / ISO 1461 |
| Surface Finish | Bright spangled / Minimized spangle | Smooth zinc-coated surface with excellent corrosion resistance |
| Application | Construction, grounding systems, fencing, power transmission, steel structures | Widely used in outdoor and corrosive environments |
| Certification | ISO 9001, SGS, Mill Test Certificate EN 10204 3.1 | Third-party inspection available on request |
| Packaging | Bundled with steel strips, waterproof paper wrapped | Seaworthy export packaging with tags and markings |
| MOQ | 5 Metric Tons | Smaller quantities negotiable for trial orders |
Galvanized Flat Steel - ASTM Certified Mill Direct Manufacturer
Galvanized flat steel delivers exceptional corrosion protection and structural versatility for demanding industrial and construction applications. As a mill-direct manufacturer with ASTM certification, we produce hot-dip galvanized flat steel bars that meet rigorous international quality standards including ASTM A123, ASTM A153, and EN ISO 1461. Our galvanizing process applies a uniform zinc coating that extends service life by 3–5 times compared to uncoated carbon steel, making it the preferred choice for outdoor structures, agricultural equipment, grounding systems, and general fabrication. Whether you require standard dimensions or custom-cut lengths, our production facility maintains annual capacity exceeding 50,000 metric tons with consistent delivery timelines for both domestic and export orders.
What Is Galvanized Flat Steel?
Galvanized flat steel is a rectangular cross-section steel bar that has been coated with a protective zinc layer through the hot-dip galvanization process. During manufacturing, mild or low-carbon steel flat bars are immersed in molten zinc at approximately 450°C (842°F), creating a metallurgically bonded zinc-iron alloy coating typically ranging from 45 to 85 µm in thickness. This zinc layer acts as both a physical barrier and a sacrificial anode, providing outstanding anti-corrosion properties even when the surface sustains minor scratches or abrasions. The resulting product combines the structural strength of carbon steel with long-term weather resistance suitable for harsh environments.
Galvanized Flat Steel Technical Specifications
Our galvanized flat bar products are manufactured to precise dimensional and coating standards, ensuring reliable performance across all applications:
- Material Base: Q235B, Q345B, SS400, A36 low-carbon steel
- Width Range: 20 mm – 200 mm
- Thickness Range: 3 mm – 30 mm
- Standard Lengths: 6 m, 9 m, 12 m, or custom-cut to specification
- Zinc Coating Thickness: 45–85 µm (equivalent to 325–610 g/m² per ASTM A123)
- Tensile Strength: 370–510 MPa (depending on steel grade)
- Yield Strength: ≥235 MPa (Q235B) / ≥345 MPa (Q345B)
- Surface Finish: Bright spangled, minimized spangle, or matte finish available
- Applicable Standards: ASTM A123/A153, EN ISO 1461, GB/T 706, JIS G3302
Each production batch undergoes coating adhesion testing, thickness measurement via magnetic induction, and salt spray testing exceeding 1,000 hours to neutral salt spray per ASTM B117, ensuring consistent quality across every shipment.
Key Applications of Galvanized Flat Steel Bars
Galvanized flat steel finds extensive application across multiple industries due to its combination of formability, weldability, and corrosion resistance:
- Electrical Grounding Systems: Serves as primary grounding conductors and earthing strips in power substations and building lightning protection systems
- Structural Fabrication: Used in steel framework, bracing, cross members, and support brackets for commercial and industrial buildings
- Agricultural Infrastructure: Ideal for greenhouse framing, fencing components, and livestock enclosure supports
- Highway and Bridge Components: Guard rail backing plates, sign post brackets, and bridge deck reinforcement elements
- General Manufacturing: Machine frames, trailer components, shelving systems, and cable tray supports
Get a Competitive Quote for Galvanized Flat Steel
As a certified mill-direct manufacturer, we eliminate intermediary costs and deliver premium-grade galvanized flat steel at cost-effective mill-direct rates. Our dedicated export team handles documentation, inspection coordination, and logistics to ensure seamless delivery worldwide.
- 24/7 customer support available
- Free samples for quality evaluation
- Competitive pricing for bulk orders
- Professional technical consultation
Contact us today to get your free quote within 24 hours!
Ratings & Reviews
Know your supplier
Product Introduction
Hongji Profiles Co., Ltd. is a professional manufacturer and supplier specializing in the R&D, production and sales of high-quality steel profiles. With years of experience in the metallurgical industry, we have earned a solid reputation for reliability, precision and customer-centric service, providing global clients with premium steel profile solutions for diverse industrial and architectural needs.
Our core business covers a full range of steel profiles, including angle steel, channel steel, I-beams, H-beams, C-section steel, Z-section steel, flat steel and custom special steel profiles. These products are widely applied in building structures, bridges, transmission towers, industrial machinery, automotive components and shipping. We strictly control material selection, adopting high-quality steel grades such as S235JR, S355JR, SS400, A36 and Q355 series to ensure excellent mechanical properties, durability and corrosion resistance.
Guided by a customer-first philosophy, we have built a comprehensive sales and after-sales network. Our products are exported to Europe, North America, Southeast Asia and Africa, with long-term cooperation with well-known enterprises. Our team provides one-stop services, and we ensure prompt delivery through sufficient inventory and optimized logistics.
Upholding “Quality First, Integrity-based, Innovation-driven, Win-Win Cooperation”, Hongji is committed to becoming a global leader in the steel profile industry, continuously improving quality and service to create a better future with global customers.
FAQ
Supplier's customization ability
- Drawing-based customization
- Sample-based customization
- Full customization
Minimum order quantity: 1 ton
Shipping total: To be negotiated
- Lead time:
- confirmed with the quotation
- Packaging:
- standard export packing
- Samples:
- available on request
