Cold‑Formed Thin‑Wall Steel

The China Cold‑Formed Thin‑Wall Steel by Guojian supplier is a lightweight structural steel profile produced through continuous roll forming and cold bending of steel strips at ambient temperature. Unlike traditional hot-rolled steel, it does not require high-temperature heating; instead, it relies on precision cold-forming processes to achieve optimized cross-sectional shapes, uniform wall thickness, and high dimensional accuracy. As a new type of primary material for lightweight, high-strength, and highly efficient steel structures, it serves as a core component for modern new energy projects and steel-structured buildings.

Core Advantages

1. Manufacturing Precision

Utilizing fully automated CNC roll-forming lines, the profiles feature symmetrical cross-sections, high straightness, precise punching, and clean, burr-free cuts. This ensures seamless on-site assembly and compliance with rigorous international acceptance standards.

2. Superior Corrosion Resistance

Dual anti-corrosion options are available: high-zinc hot-dip galvanizing or zinc-aluminum-magnesium alloy coating. These coatings are uniform and dense, offering self-healing properties and resistance to salt spray, humidity, and UV degradation, making them suitable for diverse global climates, including coastal, desert, and high-humidity environments.

3. Material Performance

The entire product line utilizes premium Q235B/Q355B steel strips compliant with national standards. The material offers stable mechanical properties, meeting required standards for tensile strength, flexural strength, and load-bearing capacity. The structural safety factor fully satisfies the load requirements for large- and medium-scale photovoltaic and steel structure projects.

4. Customization Capabilities

We support full-dimension customization, non-standard cross-section designs, and deep processing services such as pre-punching, precision cutting, and bending. Cross-section specifications can be individually optimized based on project-specific factors such as wind and snow loads, structural spans, and installation spacing.

5. Advantages in Delivery and Quality Control

Cold‑Formed Thin‑Wall Steel feature standardized batch production, uniform coating, and consistent specifications; they undergo full pre-shipment inspection and support standardized full-container exports, making them ideal for stable, high-volume, long-term overseas supply.

Key Technical Specifications

1. Applicable Materials

Q235B, Q355B high-strength carbon structural steel

2. Product Categories & Specifications

• C-sections: 80–300mm (full range of heights; customizable)

• Z-sections: 100–300mm (standard cross-sections per national standards)

• U-sections & Hat-sections (Omega profiles): Customization available for non-standard/special shapes

• Thickness range: 1.2mm–3.0mm (standard); thicker specifications available upon request

3. Anti-corrosion Technical Parameters

• Hot-dip galvanizing: Coating thickness ≥65μm; strong adhesion, resistant to peeling

• Zinc-Aluminum-Magnesium (Zn-Al-Mg): Composite alloy coating; salt spray resistance is 3–5 times that of standard galvanizing; features self-healing properties for scratches

4. Processing Parameters

• Forming method: Fully automated, continuous cold-roll forming at ambient temperature

• Processing precision: Length tolerance ≤±2mm; hole position tolerance ≤±1mm

• Optional processes: Fixed-length cutting, pre-punching, flanging, bending, and chamfering/finishing

5. Mechanical & Usage Standards

• Structural compliance: GB/T 51218 and 11G521-1 (steel structure purlin design standards)

• Design load: Suitable for standard outdoor wind and snow load requirements; can be upgraded/reinforced to meet specific overseas national standards

Packaging, Transport, and Shipping Standards

1. Factory Packaging Standards

• Cold‑Formed Thin‑Wall Steel are uniformly bundled and neatly stacked; each bundle features consistent specifications and even weight.

• Contact surfaces of profiles are fitted with protective corner guards and waterproof film, then fully wrapped in stretch film.

• Ends are sealed and protected to prevent damage—such as deformation, coating loss, or scratching—caused by bumps or impacts during ocean transport.

2. Shipping and Delivery Advantages

• Stock available for standard specifications; ready for immediate shipment.

• Rapid production scheduling for custom specifications; stable and controllable lead times.

• Supports domestic full-truckload logistics and overseas export via full container load (FCL) or less-than-container load (LCL).

3. Transport Assurance

Strict control over flatness and straightness at the factory; prevention of deformation from secondary bending throughout the process; ensuring customers receive goods free from bending, deformation, coating loss, or defects.