The closest ASTM W-shape equivalent to the GB HW 300x300 (GB/T 11263) is the W12x96 (ASTM A6/A992), with dimensional and load capacity alignment for heavy-load applications like bridge girders and industrial columns:
Dimensional and Property Comparison
| Parameter | ASTM W12x96 (A992) | GB HW 300x300 (Q355B) | Alignment Status |
|---|---|---|---|
| Depth (d) | 12.71 inches = 322.8 mm | 300 mm | +22.8 mm (within ASTM/GB tolerances) |
| Flange Width (bf) | 12.01 inches = 305.1 mm | 300 mm | +5.1 mm |
| Web Thickness (tw) | 0.500 inches = 12.70 mm | 10.5 mm | +2.2 mm |
| Flange Thickness (tf) | 0.855 inches = 21.72 mm | 15.5 mm | +6.22 mm |
| Weight (w) | 96 lbs/ft = 143.1 kg/m | 94.5 kg/m | +8.6 kg/m |
| Section Modulus (Sx) | 144 in³ = 2360 cm³ | 1350 cm³ | +1010 cm³ (43% higher) |
| Yield Strength (Fy) | 345 MPa | 355 MPa (≤16 mm) | -10 MPa |
Substitution Feasibility
Load Capacity: W12x96's higher section modulus (2360 cm³ vs. 1350 cm³) means it can support 43% more bending load for the same span. For example, over an 8-meter span, W12x96 supports ~814 kN·m (2360 cm³ × 345 MPa), while HW 300x300 supports ~479 kN·m (1350 cm³ × 355 MPa). This allows downsizing to a W12x72 (107 in³/1750 cm³) for cost savings if the load permits.
Fitment: The W12x96's slightly wider flange (305.1 mm vs. 300 mm) fits GB brackets with minor adjustments (e.g., using M20 bolts with 25 mm washers to cover the 5.1 mm gap). The thicker web (12.7 mm vs. 10.5 mm) enhances shear capacity (245 kN vs. 195 kN), eliminating the need for web stiffeners.
Fabrication: Both use the same welding processes (SMAW/GMAW) with E5015/ER50-6 consumables. The W12x96's thicker flange requires slightly longer welds (12 mm vs. 10 mm leg length) to ensure full penetration, but no changes to equipment are needed.
While not an exact dimensional match, the W12x96 is the most practical ASTM equivalent for HW 300x300, offering superior load capacity and compatibility with GB designs.