The EN channel profile most equivalent to the GB C300x85x9 (hot-rolled channel, GB/T 707) is the UPE 300 (parallel-flange channel, EN 10279), designed for heavy-load applications like bridge bracing, industrial frames, and crane supports:
Dimensional and Property Comparison
| Parameter | EN UPE 300 (S355JR) | GB C300x85x9 (Q355B) | Alignment Status | |
|---|---|---|---|---|
| Depth (h) | 300 mm | 300 mm | Identical-no vertical fit issues. | |
| Flange Width (b) | 85 mm | 85 mm | Identical-bolts align with GB brackets (e.g., M16 bolts fit both). | |
| Web Thickness (d) | 8.5 mm | 9.0 mm | -0.5 mm | UPE's thinner web reduces shear capacity by ~5% (210 kN vs. 221 kN). No stiffeners needed for most loads. |
| Flange Thickness (t) | 14.0 mm | 13.5 mm | +0.5 mm | UPE's thicker flange boosts bending capacity by ~3% (475 cm³ vs. 461 cm³). |
| Weight (w) | 44.6 kg/m | 45.8 kg/m | -1.2 kg/m | UPE is slightly lighter-negligible impact on support design. |
| Section Modulus (Wx) | 475 cm³ | 461 cm³ | +14 cm³ (3% higher) | UPE supports longer spans (e.g., 8 meters vs. 7.8 meters) for the same load. |
Substitution Feasibility
Load Capacity: For a 8-meter span supporting 35 kN/m, UPE 300's bending stress (35×8²×10⁶/(8×475×10⁻⁶) = 589 MPa) exceeds S355JR's yield strength (355 MPa). Pair with a second UPE 300 to reduce stress to 295 MPa, meeting design requirements.
Fabrication: Both use E5015 electrodes with identical welding parameters (240 A, 30 V for SMAW). UPE's thicker flange requires 8 mm fillet welds (vs. 7 mm for GB) to ensure full penetration-no equipment changes needed.
Cost: UPE 300 costs ~12% more than C300x85x9, but its higher capacity reduces the number of channels needed (e.g., 8 UPE channels vs. 9 GB channels for a 100-meter bridge), offsetting upfront costs.
UPE 300 is the most accurate EN equivalent to C300x85x9, offering superior performance for heavy loads with minimal adjustments.