Product Name
Cold-Bent Equal-Angle Channel Steel (Cold-Formed Equal-Leg C-Channel)
1. Overview
Cold-bent equal-angle channel steel is a cold-formed structural section produced by bending or roll-forming steel strips or coils at room temperature into a C- or U-shaped profile with equal flange widths. Unlike hot-rolled channels, cold-bent equal-angle channels feature accurate dimensions, smooth surfaces, and thinner wall thicknesses, making them ideal for lightweight structural systems, building frames, and industrial supports.
This section type combines the mechanical strength of carbon steel with excellent dimensional precision and cost efficiency, offering a practical solution for modern prefabricated and modular construction.
2. Manufacturing Process
The section is formed by cold bending or roll forming flat steel coils through a series of rolls without heating.
Process flow:
Steel coil → Uncoiling → Leveling → Cold bending/roll forming → Cutting to length → Finishing → Packaging.
Cold-forming advantages:
Maintains high dimensional accuracy (±0.5 mm typical).
Enhances yield strength slightly due to strain hardening.
Enables flexible, custom profiles for architectural and industrial use.
3. Material Grades & Standards
Common Grades: Q195, Q235, Q345, S235, S275, S355, ASTM A36, A572 Gr.50.
Surface Options:
Black / untreated
Hot-dip galvanized (HDG)
Electro-galvanized
Prepainted (PPGI/PPGL)
Applicable Standards: GB/T 6723, EN 10219, ASTM A500, JIS G3350, or per customer drawing/specification.
4. Typical Dimensions (Customizable)
| Parameter | Range / Description |
|---|---|
| Depth (h) | 40 mm – 200 mm |
| Flange width (b) | Equal to h for "equal-leg" channels (e.g., 50×50, 100×100) |
| Thickness (t) | 2.0 mm – 8.0 mm |
| Length | 2 m – 12 m (6 m and 12 m common) |
| Edge radius | 2–5 mm (depends on forming rolls) |
| Weight per metre | 2 – 35 kg/m (depending on section size) |
Custom lengths, cut-to-size, and punched/drilled holes are available upon request.
5. Mechanical & Physical Properties
| Property | Typical Value / Description |
|---|---|
| Tensile strength | 340–510 MPa (depends on grade) |
| Yield strength | 235–345 MPa typical |
| Elongation | ≥ 20% |
| Forming precision | ±0.5 mm per dimension |
| Straightness tolerance | ≤ 1 mm/m |
Cold forming induces a small work-hardening effect that increases strength slightly compared to hot-rolled equivalents.
6. Key Features & Advantages
High dimensional accuracy: consistent cross-section and flatness suitable for precision assembly.
Smooth, clean surface: ideal for painting, galvanizing, or decorative finishing.
Lightweight yet strong: provides efficient strength-to-weight ratio for light and medium loads.
Good weldability and machinability: easy to cut, weld, and fabricate into various assemblies.
Economical production: roll-forming enables large-scale, low-cost manufacturing.
Customizable shape: flange width, lip, and web depth can be tailored to meet project requirements.
Enhanced corrosion protection: available with zinc or organic coatings for outdoor durability.
7. Typical Applications
Building structures: wall studs, roof purlins, door and window frames, trusses, and cold-formed columns.
Industrial frameworks: equipment supports, shelving systems, warehouse racking, cable tray frames.
Infrastructure: highway guardrails, power tower bracing, solar mounting systems.
Vehicle manufacturing: truck and trailer frames, agricultural machinery chassis.
Decorative and civil use: fence rails, stair stringers, and architectural trims.
8. Surface Treatment & Protection
Hot-dip galvanizing (HDG): provides long-term corrosion resistance.
Electro-galvanizing: for interior and decorative use.
Powder coating / Painting: improves aesthetics and adds protection.
Prepainted coil forming: color-coated channels for architectural applications.
Oiling & packaging: optional anti-rust oil layer before shipment for uncoated products.
9. Quality Control & Inspection
Each batch of cold-bent equal-angle channel steel undergoes:
Dimensional inspection: cross-section width, height, wall thickness, length, and straightness.
Mechanical testing: tensile, yield, elongation as per standard.
Surface inspection: no burrs, cracks, or sharp edges after bending.
Coating check: zinc layer thickness (for galvanized), adhesion, paint thickness (DFT).
MTC (Mill Test Certificate): issued with heat number and test data traceability.
Optional tests: bend test, impact test, salt spray, and adhesion tests for coated products.
10. Packaging & Delivery
Bundled with steel straps and plastic film wrap.
Wooden supports or pallets to prevent deformation during transit.
Ends protected with caps or plastic sheets.
Labels include: product name, material grade, section size, length, coating, heat/batch number, and date.
Export packaging meets seaworthy standards (anti-rust, moisture protection).
11. Ordering Guide - What to Specify
When placing an order, please include:
Section dimensions (h × b × t) and whether equal or unequal leg.
Material grade (Q235, S235, etc.).
Surface finish (black, HDG, painted, PPGI).
Length & tolerance requirements.
End-use application (for coating and mechanical requirements).
Quantity / total tonnage.
Inspection or certification requirements (MTC, third-party inspection).
Special fabrication needs: pre-drilled holes, slots, notches, or welding marks.
12. Advantages Compared to Hot-Rolled Channel Steel
| Aspect | Cold-Bent Equal-Angle Channel | Hot-Rolled Channel |
|---|---|---|
| Forming process | Cold roll forming / bending | Hot rolling |
| Thickness range | 2–8 mm (thin/light) | 5–40 mm (medium-heavy) |
| Surface quality | Smooth, clean | Scale-covered (requires shot blasting) |
| Dimensional accuracy | High (±0.5 mm typical) | Moderate |
| Weight | Lighter | Heavier |
| Customization | Easy (non-standard sizes) | Limited (standard mill sizes only) |
| Cost per meter | Lower for thin/light sizes | Higher per ton for light applications |
13. Typical Advantages for Engineers & Fabricators
Simplifies assembly with precise fit and consistent geometry.
Reduces welding distortion thanks to uniform thickness.
Easy integration with bolted cold-formed systems (steel studs, purlins).
Faster on-site installation - minimal rework or adjustment.
Compatible with galvanized or color-coated sheet supply chains for turnkey projects.
14. Optional Services
Pre-punched / slotted holes for bolted assembly.
CNC laser cutting or coping.
Galvanizing and powder-coating per project specification.
Cut-to-length and packaging optimization for containerized shipping.
Engineering support: load tables, deflection checks, and connection design references.
15. Summary
Cold-bent equal-angle channel steel provides a versatile, lightweight, and dimensionally accurate solution for modern construction and manufacturing. Combining the benefits of cold-forming precision, moderate strength, and easy fabrication, it is widely adopted in steel framing, industrial machinery, and modular structures. Its excellent balance between strength, corrosion resistance, and cost efficiency makes it a dependable choice for light to medium structural applications worldwide.
Would you like me to also prepare a technical datasheet version (one-page PDF-style summary with size, weight, and section properties), or a specification sheet suitable for supplier RFQs (ready to send)?
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