GB/T 11263 splits H beams into HW (wide flange — columns), HM (middle flange) and HN (narrow flange — beams). Volume sizes: HW250×250 = 72.4 kg/m, HW300×300 = 94.5 kg/m, HN300×150 = 37.3 kg/m, HM294×200 = 57.3 kg/m — rolled in Q235B and Q355B with EN 10204 3.1 MTC. Chinese mills roll GB by default: best price, shortest lead.
The GB H beam system is China's native answer to the W and IPE series — and because Chinese mills roll it by default, GB sections are usually the cheapest and fastest route to any H beam order. The designation reads differently, but once decoded it is the same steel.
Decoding HW / HM / HN
- H = hot-rolled H section (GB/T 11263).
- W (wide): flange width ≈ section height — the column family. "HW 250×250" = 250 mm deep, 250 mm wide.
- M (middle): flange width between W and N — general framing.
- N (narrow): narrow flange — the bending-efficient beam family, like IPE.
The Sizes That Move in Trade
| Designation | Height × Width (mm) | Weight (kg/m) | Typical Use |
|---|---|---|---|
| HN 200×100 | 200 × 100 | 21.7 | Floor beams, joists |
| HN 300×150 | 300 × 150 | 37.3 | Primary floor beams |
| HM 294×200 | 294 × 200 | 57.3 | Girders, transfer beams |
| HW 250×250 | 250 × 250 | 72.4 | Columns |
| HW 300×300 | 300 × 300 | 94.5 | Heavy columns |
The complete GB/T 11263 range (100×100 to 900×300, 46 sizes) with weights: GB weight table →
GB vs W Series vs IPE — Cross-Mapping
| GB | Closest W (ASTM) | Closest IPE (EN) | Position |
|---|---|---|---|
| HN 300×150 | W12×26 (38.7 kg/m) | IPE 300 (42.2 kg/m) | Floor beams |
| HM 294×200 | W14×60-class | — (between IPE 400/450) | Girders |
| HW 250×250 | W10×88-class | HEB 260-class | Columns |
| HW 300×300 | W12×120-class | HEB 300-class | Heavy columns |
Not one-to-one — flange geometry and weights differ — but the mapping orients the conversation: H vs I beam logic · W series chart · Polish HEA/HEB table · Vietnamese table
Grades and Supply
- Grades: Q235B (≈ S235JR/A36/SS400) for standard framing; Q355B (≈ S355JR/A572 Gr50) for heavy members — grade equivalence table, Q355B deep dive.
- Lengths: 6 / 9 / 12 m or cut-to-length ±2 mm; drilling and blasting + primer available: processing →
- Certificates: EN 10204 3.1 MTC naming GB/T 11263 and the grade, heat-number traceable.
- MOQ: 5 t — GB lines roll continuously, so lead times run 15–25 days without special scheduling.
GB sections = best mill prices
HW/HM/HN size list to [email protected] or WhatsApp +86 191 5745 8011 — quotation with equivalence documentation to your drawing standard, in one working day.
Request GB H Beam Quote