American W-shapes (ASTM A6) are dimensional equivalents to China's GB HW (Wide Flange) H-beams for heavy-load applications, with key comparisons for common sizes:
W8x48 (ASTM) vs. HW 200x200 (GB): W8x48 has a depth of 8.11 inches (≈206 mm), flange width of 8.00 inches (≈203 mm), web thickness of 0.315 inches (≈8.0 mm), and weight of 48 lbs/ft (≈71.5 kg/m). HW 200x200 has a depth of 200 mm, flange width of 200 mm, web thickness of 8 mm, and weight of 56.7 kg/m. The minor depth difference (206 mm vs. 200 mm) is within ASTM/GB tolerances, and the weight variance is offset by A992's higher strength (345 MPa vs. Q355B's 355 MPa-negligible for load calculations).
W12x96 (ASTM) vs. HW 300x300 (GB): W12x96 has a depth of 12.71 inches (≈323 mm), flange width of 12.01 inches (≈305 mm), web thickness of 0.500 inches (≈12.7 mm), and weight of 96 lbs/ft (≈143 kg/m). HW 300x300 has a depth of 300 mm, flange width of 300 mm, web thickness of 10.5 mm, and weight of 94.5 kg/m. While the W-shape is deeper and heavier, its load capacity (calculated via section modulus: W12x96 ≈ 144 in³; HW 300x300 ≈ 1350 cm³ ≈ 82.4 in³) exceeds HW 300x300, making it suitable for substituting in high-load applications with minor design adjustments.
Tolerance Alignment: ASTM A6 allows depth tolerances of ±0.125 inches (≈3.18 mm) for W-shapes ≤24 inches, while GB/T 11263 allows ±2 mm for 300–500 mm. This overlap ensures W-shapes fit GB-compatible brackets and connections, as the maximum tolerance difference (1.18 mm) is within practical assembly limits.
For most projects, W-shapes can substitute HW beams by adjusting for depth/weight differences using standard structural design software (e.g., ETABS, SAP2000), which accounts for section properties from both ASTM and GB standards.