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Help CenterSteel H Beam & H Beam，Q235B、Q355B、Q235NH/Q355NH、SM490、SS400
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H-beam is a high-efficiency and economical structural steel with optimized sectional mechanical properties. It features flat, uniform and parallel flanges, outstanding bending resistance, light self-weight, convenient construction and high structural stability. As a high-grade load-bearing profile that replaces traditional I-beams and channel steels, it is widely used in steel structure workshops, high-rise buildings, bridge projects, municipal infrastructure, equipment foundations, pile foundation projects and other scenarios. This is a complete product specification covering materials, mechanical properties, full-range models, dimensions and theoretical weights.
1. Product Structure and Definition
The cross-section of an H-beam consists of a web (middle vertical plate) and flange plates (lateral plates on both sides) with right-angle parallel structure without inclination.
Specification representation: Height H × Flange Width B × Web Thickness t1 × Flange Thickness t2 (Unit: mm)
Classification Code: HW (Wide Flange), HM (Medium Flange), HN (Narrow Flange), HP (Pile Type)
2. Main Material Types, Mechanical and Chemical Parameters
The mainstream commercial materials for engineering are Q235B and Q355B, accounting for over 95% of engineering applications. Low-alloy, weather-resistant and imported materials are also available.
2.1 Application Scenarios of Common Materials
Q235B: Ordinary carbon structural steel with good toughness, excellent weldability and high cost performance. It is suitable for conventional working conditions at room temperature, including ordinary workshops, canopies, platforms, light steel structures, municipal support frames and low-rise building frames.
Q355B (Former Q345B): High-strength low-alloy steel with over 30% higher strength than Q235B, featuring superior load resistance, impact resistance and wind pressure resistance. It is applied to key projects with high seismic requirements, such as high-rise buildings, large-span workshops, bridges, heavy-duty equipment foundations and cold storage structures.
Special Materials: Q235NH/Q355NH weathering steel (for outdoor bridges and landscape steel structures), SM490, SS400 (for export), Q420 high-strength steel (for super high-rise heavy load-bearing structures).
2.2 National Standard Mechanical Properties
Material |
Yield Strength (MPa) |
Tensile Strength (MPa) |
Elongation |
Impact Test |
Q235B |
≥235 |
370-500 |
≥26% |
20℃ Normal Temperature Impact |
Q355B |
≥355 |
470-630 |
≥21% |
20℃ Normal Temperature Impact |
2.3 Executive Standards
Hot-rolled H-beam: GB/T 11263-2017; Steel structure construction standard: GB 50017-2017
3. Full Specifications of Four Types of H-beam (Model, Dimension & Theoretical Weight)
3.1 HW Wide Flange H-beam (Height-Width Ratio ≈1, Mainly for Steel Columns)
Features: Wide flange and square cross-section with excellent compression resistance, mainly used for building steel columns, rigid columns and equipment supports.
Model |
Specification (H×B×t1×t2) mm |
Theoretical Weight (kg/m) |
HW100×100 |
100×100×6×8 |
17.2 |
HW125×125 |
125×125×6.5×9 |
23.8 |
HW150×150 |
150×150×7×10 |
31.9 |
HW200×200 |
200×200×8×12 |
50.5 |
HW250×250 |
250×250×9×14 |
72.4 |
HW300×300 |
300×300×10×15 |
94.5 |
HW350×350 |
350×350×12×19 |
137 |
HW400×400 |
400×400×13×21 |
172 |
3.2 HM Medium Flange H-beam (Height-Width Ratio 1.3~1.7, Mainly for Frame Beams & Columns)
Features: Balanced bending and compression resistance, suitable for factory frames, floor beams and equipment platforms.
Model |
Specification (H×B×t1×t2) mm |
Theoretical Weight (kg/m) |
HM150×100 |
150×100×6×8 |
21.4 |
HM200×150 |
200×150×6×9 |
31.2 |
HM250×175 |
250×175×7×11 |
40.3 |
HM300×200 |
300×200×8×12 |
48.1 |
HM350×250 |
350×250×9×14 |
68.2 |
HM400×300 |
400×300×10×16 |
89.6 |
3.3 HN Narrow Flange H-beam (Height-Width Ratio 2~3, Mainly for Floor & Roof Beams)
Features: High height and narrow flange with excellent bending resistance. It is the preferred profile for factory main beams, floor beams and roof beams with the largest consumption and wide versatility.
Model |
Specification (H×B×t1×t2) mm |
Theoretical Weight (kg/m) |
HN100×50 |
100×50×4.5×7 |
9.54 |
HN150×75 |
150×75×5×7 |
14.3 |
HN200×100 |
200×100×5.5×8 |
21.7 |
HN250×125 |
250×125×6×9 |
29.7 |
HN300×150 |
300×150×6.5×9 |
37.3 |
HN350×175 |
350×175×7×11 |
50.0 |
HN400×200 |
400×200×8×13 |
60.3 |
HN450×200 |
450×200×9×14 |
66.5 |
HN500×200 |
500×200×10×16 |
79.5 |
HN600×200 |
600×200×11×17 |
88.2 |
3.4 HP Pile Type H-beam (Special for Foundation Piles)
Features: Consistent thickness of web and flange with uniform cross-section and strong extrusion resistance, specially used for foundation piles, foundation pit support and dam reinforcement.
Model |
Specification (H×B×t×t) mm |
Theoretical Weight (kg/m) |
HP200×200 |
200×200×12×12 |
59.9 |
HP250×250 |
250×250×14×14 |
84.8 |
HP300×300 |
300×300×15×15 |
106 |
4. Production Process & Custom Specifications
4.1 Hot-rolled H-beam
National standard regular sizes with high dimensional accuracy, no welding seam, good overall performance and high flatness. Sufficient spot goods for all standard steel structure projects.
4.2 Welded H-beam (Non-standard Customization)
Custom oversized, ultra-wide and non-standard thickness H-beams are available. The maximum processing height can reach 2000mm with customizable thickness. Suitable for large-span bridges, special-shaped steel structures and large-scale equipment frames, supporting full-size customization.
5. Core Product Advantages
Optimized cross-section: Uniform bidirectional stiffness, superior torsion, bending and compression resistance, saving 15%-25% steel consumption compared with ordinary I-beams.
Efficient construction: Flat and parallel flanges enable convenient bolt connection without secondary polishing, greatly shortening the construction period.
High stability: Excellent seismic, wind-resistant and load-bearing performance, applicable to high-rise and large-span key projects.
Wide adaptability: Full-range specifications cover all light, medium and heavy steel structure scenarios.
6. Surface Treatment & Deep Processing Services
Available treatments: Shot blasting, sand blasting, anti-rust primer, epoxy zinc-rich primer, fireproof coating, hot-dip galvanizing anti-corrosion.
Deep processing: Cutting, drilling, beveling, bending, welding, end polishing and customized component processing.
7. Application Scope
Industrial plant steel structures, high-rise building frames, municipal bridges, pipe gallery supports, equipment foundation platforms, foundation pit support piles, prefabricated buildings, stadium steel structures, crane main beams and other fields.
8. Supply Instructions
Sufficient spot inventory for conventional Q235B/Q355B national standard specifications. Conventional lengths: 6m/9m/12m with fixed-length cutting available. Non-standard customization takes 3-7 working days. Support full-truck delivery and port container packaging for export.
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