The EN UPE 200 (parallel-flange channel) and GB C200x75x7 (hot-rolled channel, GB/T 707) are near-equivalent for medium-load applications, with minor dimensional variances that require minimal adjustments for substitution:
Dimensional Breakdown (Metric)
| Dimension | EN UPE 200 (S355JR) | GB C200x75x7 (Q355B) | Variance | Practical Impact |
|---|---|---|---|---|
| Depth (h) | 200 mm | 200 mm | 0 mm | Identical-no fit issues with vertical brackets. |
| Flange Width (b) | 75 mm | 75 mm | 0 mm | Same flange width-bolts align with GB holes (e.g., M12 bolts fit both). |
| Web Thickness (d) | 6.5 mm | 7.0 mm | -0.5 mm | UPE's thinner web reduces shear capacity by ~7% (115 kN vs. 123 kN). No stiffeners needed for light loads. |
| Flange Thickness (t) | 10.0 mm | 11.0 mm | -1.0 mm | UPE's thinner flange reduces bending capacity by ~8% (158 cm³ vs. 172 cm³). Use UPE 220 (195 cm³) for equivalent capacity. |
| Weight (w) | 26.2 kg/m | 28.8 kg/m | -2.6 kg/m | UPE is lighter-reduces transportation and support costs. |
| Section Modulus (Wx) | 158 cm³ | 172 cm³ | -14 cm³ | Compensate with a larger UPE size (e.g., UPE 220) for heavy bending loads. |
Substitution Steps
Load Capacity Check: For a 6-meter span supporting 20 kN/m, UPE 200's bending stress (20×6²×10⁶/(8×158×10⁻⁶) = 696 MPa) exceeds S355JR's yield strength (355 MPa). Switch to UPE 220 (Wx=195 cm³) to reduce stress to 554 MPa, then add a second channel for safety.
Bracket Adjustment: UPE's thinner web requires shorter bolts (M12×25 vs. M12×30 for GB) to ensure proper thread engagement.
Welding: Use 6 mm fillet welds (vs. 7 mm for GB) to match UPE's flange thickness-no changes to current/voltage settings (200 A, 28 V for GMAW).
This alignment makes UPE 200 a cost-effective substitute for C200x75x7, with targeted adjustments for heavy loads.