High-Quality C Z U Purlin with Affordable Customization: Durable Steel Construction, Precision Engineering, and Versatile Sizing Options for Buildings

1. C-Purlin (C-Section Steel Purlin)

• Shape: Resembles the letter "C" with a single web and two flanges (one open side).

• Common Dimensions:

  • Flange Width: 50-100mm

  • Web Height: 100-300mm

  • Thickness: 1.2-3.0mm (cold-formed steel)

• Key Features:

  • Easy to fabricate and install.

  • Used for secondary structural framing (e.g., roof/wall supports).

  • Compatible with bolted or welded connections.

• Applications:

  • Industrial buildings, warehouses, and metal roofs.

2. Z-Purlin (Z-Section Steel Purlin)

• Shape: Zigzag ("Z") profile with asymmetric flanges.

• Common Dimensions:

  • Flange Width: 60-120mm

  • Web Height: 100-400mm

  • Thickness: 1.5-4.0mm

• Key Features:

  • Higher load-bearing capacity than C-purlins due to overlapping capability.

  • Optimized for long spans (e.g., 6-12m).

  • Often used in sloped roofs (nesting reduces joint gaps).

• Applications:

  • Large-span structures (aircraft hangars, solar panel supports).

3. U-Purlin (U-Section Steel Purlin/Channel Purlin)

• Shape: U-shaped channel with two parallel flanges.

• Common Dimensions:

  • Flange Width: 40-80mm

  • Web Height: 50-200mm

  • Thickness: 1.5-5.0mm

• Key Features:

  • Rigid structure, suitable for heavy loads.

  • Often hot-rolled (thicker than C/Z-purlins).

• Applications:

  • Heavy-duty industrial roofs, bridge decks, and trailer frames.

Comparison Table

Material & Coating

• Steel Grade: ASTM A653 (Galvanized), Q235/Q345 (Chinese standards).

• Corrosion Protection:

  • Hot-dip galvanized (HDG): 80-275 g/m² coating.

  • Painted/PVDF: For aesthetic or harsh environments.

Typical Standards

• International: ASTM, EN 10346, JIS G 3302.

• China: GB/T 6725 (cold-formed steel).