When engineers design skyscrapers, bridges, and industrial buildings, one structural component stands above the rest: the H-beam. Named for its distinctive capital “H” cross-section, this hot-rolled steel beam offers exceptional strength-to-weight ratio, making it the backbone of modern construction.
Whether you are a structural engineer, a steel fabricator, a contractor, or an architecture student, understanding H-beam specifications is essential for any large-scale building project.
This comprehensive guide covers everything you need to know: dimensions, weight charts, material grades, manufacturing processes, applications, and how H-beam differs from I-beam.
What is an H-Beam?
An H-beam (also known as wide flange beam or W-beam) is a hot-rolled structural steel member with an “H”-shaped cross-section. The shape consists of two parallel flanges connected by a vertical web, with the flanges being significantly wider than the web height in many cases.
Basic Terminology:
| Term | Description |
|---|---|
| Web | The vertical center section connecting the two flanges |
| Flange | The horizontal top and bottom sections |
| Height (H) | Overall vertical dimension (web height + 2 × flange thickness) |
| Flange Width (B) | Horizontal width of each flange |
| Web Thickness (t_w) | Thickness of the vertical web |
| Flange Thickness (t_f) | Thickness of each flange |
| Fillet Radius (r) | Curved transition between web and flange |
Key Characteristics:
| Property | Typical Range |
|---|---|
| Height (H) | 100mm to 1,200mm (4″ to 48″) |
| Flange Width (B) | 100mm to 400mm (4″ to 16″) |
| Web Thickness | 5mm to 40mm (0.2″ to 1.6″) |
| Flange Thickness | 7mm to 40mm (0.28″ to 1.6″) |
| Length | 6m, 9m, 12m, 15m (20′ to 50′) |
| Weight | 10 kg/m to 500+ kg/m (7 to 350+ lb/ft) |
H-Beam vs. I-Beam: Critical Differences
Many people confuse H-beams and I-beams. While they look similar, they have distinct differences that affect performance and application.
| Feature | H-Beam (Wide Flange) | I-Beam (Standard/European) |
|---|---|---|
| Cross-section shape | H (flanges as wide as web height) | I (flanges narrower than web height) |
| Flange width | Wide (nearly equal to height) | Narrow (significantly less than height) |
| Flange taper | Parallel inner and outer faces | Tapered inner face (sloped) |
| Web thickness | Constant thickness | Constant thickness |
| Strength-to-weight | Higher (more efficient) | Lower |
| Moment of inertia | More balanced in both axes | Stronger in one axis |
| Rolling process | Universal mill (parallel flanges) | Standard mill (tapered flanges) |
| Best for | Columns, heavy beams, moment frames | Simple beams, lighter loads |
| Cost | Higher (more material, complex rolling) | Lower |
Visual Comparison:
text
When to choose H-beam:
- Columns in multi-story buildings
- Long-span beams
- Moment-resisting frames
- Heavy industrial structures
- Crane runways
When to choose I-beam:
- Simple supported beams
- Secondary framing
- Light-to-medium loads
- Cost-sensitive projects
- Where tapered flanges are acceptable
H-Beam Manufacturing Process
H-beams are produced through hot rolling in a universal mill.
Production Steps:
- Reheating: Steel billet or bloom is heated to 1,200°C (2,200°F)
- Roughing rolling: Initial shaping through roughing stands
- Universal rolling: Passed through vertical and horizontal rolls simultaneously
- Horizontal rolls control flange thickness
- Vertical rolls control web height
- Edging rolling: Shapes flange tips
- Cooling: Controlled cooling on cooling bed
- Straightening: Roller straightening to correct any bending
- Cutting: Cut to customer-specified lengths (typically 6m-15m)
- Marking: Stamped with size, grade, heat number, and mill ID
Advantages of hot rolling:
- Refines grain structure
- Eliminates internal stresses
- Produces consistent mechanical properties
- Cost-effective for large volumes
Complete H-Beam Size Chart (Metric)
Below is a comprehensive size chart for common hot-rolled H-beams (based on JIS G3192 / GB/T 11263 standards).
Series 100-200 (Small to Medium)
| Designation | H (mm) | B (mm) | t_w (mm) | t_f (mm) | Weight (kg/m) | Section Area (cm²) |
|---|---|---|---|---|---|---|
| HW 100×100 | 100 | 100 | 6 | 8 | 17.2 | 21.9 |
| HM 150×100 | 150 | 100 | 6 | 9 | 21.4 | 27.3 |
| HW 125×125 | 125 | 125 | 6.5 | 9 | 23.8 | 30.3 |
| HM 150×150 | 150 | 150 | 7 | 10 | 31.5 | 40.1 |
| HW 175×175 | 175 | 175 | 7.5 | 11 | 40.3 | 51.4 |
| HW 200×200 | 200 | 200 | 8 | 12 | 50.5 | 64.3 |
Series 200-400 (Medium to Large)
| Designation | H (mm) | B (mm) | t_w (mm) | t_f (mm) | Weight (kg/m) | Section Area (cm²) |
|---|---|---|---|---|---|---|
| HM 200×150 | 194 | 150 | 6 | 9 | 31.2 | 39.8 |
| HM 244×175 | 244 | 175 | 7 | 11 | 44.1 | 56.2 |
| HM 250×250 | 250 | 250 | 9 | 14 | 72.4 | 92.2 |
| HM 294×200 | 294 | 200 | 8 | 12 | 57.3 | 73.0 |
| HM 300×300 | 300 | 300 | 10 | 15 | 94.5 | 120 |
| HM 340×250 | 340 | 250 | 9 | 14 | 79.7 | 102 |
| HM 350×350 | 350 | 350 | 12 | 19 | 138 | 176 |
| HM 390×300 | 390 | 300 | 10 | 16 | 107 | 136 |
| HM 400×400 | 400 | 400 | 13 | 21 | 172 | 219 |
Series 400-600 (Heavy Duty)
| Designation | H (mm) | B (mm) | t_w (mm) | t_f (mm) | Weight (kg/m) | Section Area (cm²) |
|---|---|---|---|---|---|---|
| HM 440×300 | 440 | 300 | 11 | 18 | 124 | 158 |
| HM 450×300 | 450 | 300 | 12 | 18 | 130 | 166 |
| HM 482×300 | 482 | 300 | 11 | 15 | 115 | 146 |
| HM 488×300 | 488 | 300 | 11 | 18 | 129 | 164 |
| HM 500×200 | 500 | 200 | 10 | 16 | 89.6 | 114 |
| HM 500×300 | 500 | 300 | 12 | 20 | 155 | 198 |
| HM 550×300 | 550 | 300 | 12 | 20 | 166 | 212 |
| HM 582×300 | 582 | 300 | 12 | 17 | 137 | 175 |
| HM 588×300 | 588 | 300 | 12 | 20 | 177 | 226 |
| HM 600×200 | 600 | 200 | 11 | 17 | 106 | 135 |
Series 600-900 (Extra Heavy Duty)
| Designation | H (mm) | B (mm) | t_w (mm) | t_f (mm) | Weight (kg/m) | Section Area (cm²) |
|---|---|---|---|---|---|---|
| HM 600×300 | 600 | 300 | 12 | 20 | 177 | 226 |
| HM 606×201 | 606 | 201 | 12 | 20 | 118 | 150 |
| HM 650×300 | 650 | 300 | 13 | 22 | 204 | 260 |
| HM 700×300 | 700 | 300 | 13 | 24 | 235 | 299 |
| HM 750×300 | 750 | 300 | 13 | 25 | 253 | 322 |
| HM 800×300 | 800 | 300 | 14 | 26 | 279 | 355 |
| HM 850×300 | 850 | 300 | 14 | 27 | 298 | 380 |
| HM 900×300 | 900 | 300 | 16 | 28 | 333 | 424 |
Note: Designations vary by standard (JIS, ASTM, GB, EN). HW = Wide flange, HM = Medium flange, HN = Narrow flange.
H-Beam Weight Calculation Formula
To calculate weight for non-standard sizes or custom lengths:
Formula:
text
Where:
- H = Height (mm)
- B = Flange width (mm)
- t_w = Web thickness (mm)
- t_f = Flange thickness (mm)
- 7.85 = Density of steel (g/cm³)
Simplified (approximate):
text
Example – HM 300×300×10×15:
- H = 300, B = 300, t_w = 10, t_f = 15
- Exact calculation: [(300×10) + (2×300×15) – (2×10×15)] × 7.85 / 10,000
- = [3,000 + 9,000 – 300] × 0.000785
- = 11,700 × 0.000785
- = 91.8 kg/m (matches chart: 94.5 kg/m, slight rounding)
H-Beam Material Grades
H-beams are manufactured in various steel grades depending on application requirements.
Carbon Steel Grades
| Standard | Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Typical Use |
|---|---|---|---|---|---|
| ASTM (USA) | A36 | ≥250 | 400-550 | ≥20 | General structure |
| A572 Gr. 50 | ≥345 | 450-550 | ≥18 | High strength | |
| A992 | ≥345 | 450-550 | ≥18 | Building frames | |
| JIS (Japan) | SS400 | ≥245 | 400-510 | ≥17 | General structure |
| SM400 | ≥235 | 400-510 | ≥18 | Welded structure | |
| SM490 | ≥325 | 490-610 | ≥17 | High strength | |
| SN400 | ≥235 | 400-510 | ≥18 | Building (seismic) | |
| GB/T (China) | Q235B | ≥235 | 370-500 | ≥26 | General structure |
| Q355B | ≥355 | 470-630 | ≥21 | High strength | |
| Q390B | ≥390 | 490-650 | ≥19 | Heavy duty | |
| Q420B | ≥420 | 520-680 | ≥18 | Bridges, high-rise | |
| EN (Europe) | S235JR | ≥235 | 360-510 | ≥26 | General structure |
| S355JR | ≥355 | 470-630 | ≥22 | High strength | |
| S460M | ≥460 | 530-700 | ≥17 | Extra high strength |
Weathering Steel (Corrosion Resistant)
| Grade | Standard | Key Feature |
|---|---|---|
| A588 | ASTM | Atmospheric corrosion resistance (4x carbon steel) |
| S355J0W | EN | Weathering steel |
| Q355NH | GB/T | Weathering steel |
Fire-Resistant Grades
Some manufacturers produce fire-resistant H-beams with enhanced high-temperature strength (maintains 2/3 of room temperature strength at 600°C).
Mechanical Properties of H-Beam
Section Properties (Example: HM 300×300×10×15)
| Property | Value | Unit |
|---|---|---|
| Area (A) | 120 | cm² |
| Weight | 94.5 | kg/m |
| Moment of Inertia – X-axis (I_x) | 20,400 | cm⁴ |
| Moment of Inertia – Y-axis (I_y) | 6,750 | cm⁴ |
| Section Modulus – X-axis (Z_x) | 1,360 | cm³ |
| Section Modulus – Y-axis (Z_y) | 450 | cm³ |
| Radius of Gyration – X-axis (r_x) | 13.1 | cm |
| Radius of Gyration – Y-axis (r_y) | 7.51 | cm |
| Plastic Modulus – X-axis (S_x) | 1,520 | cm³ |
Material Properties (Q355B / A992)
| Property | Value | Unit |
|---|---|---|
| Density | 7,850 | kg/m³ |
| Modulus of Elasticity (E) | 200 | GPa |
| Shear Modulus (G) | 77 | GPa |
| Poisson’s Ratio (ν) | 0.3 | – |
| Coefficient of Thermal Expansion | 12 × 10⁻⁶ | /°C |
| Thermal Conductivity | 45 | W/m·K |
Common Applications of H-Beam
Thanks to its excellent strength-to-weight ratio and balanced properties, H-beams are used in:
1. Building Construction
- Columns: Primary vertical supports in multi-story buildings
- Beams: Floor and roof support beams
- Moment frames: Earthquake-resistant structures
- Purlins: Roof support (smaller sections)
- Mezzanine floors: Support structures
- Portal frames: Industrial warehouses
2. Bridges and Infrastructure
- Bridge girders: Main load-carrying members
- Pedestrian bridges: Light to medium span
- Overhead sign structures: Highway signs
- Sound barriers: Support frames
- Railway bridges: Primary structure (heavy sections)
3. Industrial Structures
- Crane runways: Overhead crane support
- Factory buildings: Main frames
- Conveyor supports: Heavy-duty systems
- Equipment platforms: Access platforms
- Mining structures: Head frames, conveyors
4. Marine and Offshore
- Shipbuilding: Hull stiffeners, deck beams
- Dock structures: Piers, wharves
- Offshore platforms: Jacket legs, deck support
5. Special Applications
- Earthquake-resistant cores: High-rise buildings
- Transmission towers: Large power line towers
- Stadiums: Roof trusses, seating supports
- Airport terminals: Large-span structures
Advantages of H-Beam
✅ Excellent Strength-to-Weight Ratio
The wide flanges distribute load efficiently, allowing longer spans with less material than I-beams.
✅ Balanced Strength in Both Axes
Unlike I-beams, H-beams have similar strength in the X and Y axes, making them ideal for columns (which experience biaxial bending).
✅ Easy Connections
The parallel flanges make bolted and welded connections simpler than tapered-flange I-beams.
✅ High Load Capacity
H-beams can support very heavy loads, making them suitable for high-rise buildings and bridges.
✅ Good Fire Resistance
Steel maintains strength up to 540°C (1,000°F). Fireproofing can extend rating to 2-4 hours.
✅ Recyclable
100% recyclable at end of life. Steel is the most recycled material on Earth.
✅ Consistent Quality
Hot rolling produces uniform dimensions and predictable mechanical properties.
Disadvantages and Limitations
❌ Higher Cost
H-beams are more expensive than I-beams of equivalent weight due to more complex rolling and higher material content.
❌ Weight
For the same height, H-beams are heavier than I-beams. This increases transportation and handling costs.
❌ Requires Fireproofing
Unprotected steel loses strength at high temperatures. Fireproofing (spray-on, intumescent paint, or encasement) is required by building codes.
❌ Corrosion Prone
Carbon steel rusts. Protective coatings or galvanizing are needed for outdoor or marine environments.
❌ Not Ideal for Torsion
Open sections (H, I, C) have poor torsional resistance compared to closed sections (tube, pipe).
H-Beam Selection Guide
Step 1: Determine Load Requirements
| Load Type | Key Consideration |
|---|---|
| Axial compression (column) | Slenderness ratio, buckling strength |
| Bending (beam) | Moment capacity, deflection limits |
| Combined loads | Interaction formula (compression + bending) |
Step 2: Consider Span Length
| Span (meters) | Recommended Depth (H) |
|---|---|
| 3-5 m | 150-200 mm |
| 5-8 m | 200-300 mm |
| 8-12 m | 300-400 mm |
| 12-15 m | 400-500 mm |
| 15-20 m | 500-600 mm |
| 20-25 m | 600-700 mm |
| 25-30 m | 700-900 mm |
Rule of thumb: Beam depth = span / 15 to span / 20 for typical loads.
Step 3: Choose Grade
| Application | Recommended Grade |
|---|---|
| General building (non-seismic) | A36 / Q235B / S235 |
| High-rise building (seismic) | A992 / Q355B / S355 |
| Bridges | Q355B / S355 / A572 Gr.50 |
| Heavy industrial | Q390B / Q420B |
| Low temperature | Q355D / S355NL |
| Outdoor (no paint) | A588 / Q355NH (weathering) |
Step 4: Verify Local Codes
Always check:
- Local building codes (IBC, Eurocode, GB50017)
- Seismic design requirements
- Fire protection requirements
- Corrosion protection requirements
H-Beam Standards by Region
| Region | Dimensional Standard | Material Standard |
|---|---|---|
| USA | ASTM A6 | ASTM A36, A572, A992 |
| Japan | JIS G3192 | JIS G3101 (SS400), G3106 (SM490) |
| China | GB/T 11263 | GB/T 1591 (Q355B) |
| Europe | EN 10365 | EN 10025 (S235, S355) |
| International | ISO 1035 | ISO 630 |
Designation examples by standard:
| USA | Japan | China | Europe |
|---|---|---|---|
| W10×22 | H 250×125 | HM 244×175 | IPE 240 |
| W12×50 | H 300×300 | HM 300×300 | HE 300 B |
| W14×82 | H 350×350 | HM 350×350 | HE 340 B |
| W18×35 | H 400×200 | HN 400×200 | IPE 400 |
H-Beam vs. Other Structural Shapes
| Shape | Strength (bending) | Strength (column) | Torsion Resistance | Cost | Best For |
|---|---|---|---|---|---|
| H-Beam | Excellent | Excellent | Poor | High | Columns, heavy beams |
| I-Beam | Good | Fair | Poor | Medium | Simple beams |
| Channel (C) | Fair | Poor | Poor | Low | Secondary framing |
| Angle (L) | Poor | Fair | Very poor | Very Low | Bracing, light loads |
| Square Tube (SHS) | Good | Good | Excellent | Medium | Columns, torsion |
| Round Pipe (CHS) | Good | Good | Excellent | Medium | Columns, fluids |
| Built-up Box | Excellent | Excellent | Excellent | Very High | Special heavy loads |
Installation and Handling Tips
Lifting and Rigging
- Use spreader beams for long sections to prevent bending
- Lift from lifting points marked by manufacturer
- Never lift from flange tips (use web holes if provided)
Storage
- Store on level ground
- Use timber dunnage (spaced every 2-3 meters)
- Keep off ground to prevent rust
- Cover with tarps for outdoor storage
- Separate different sizes for easy identification
Connection Methods
| Method | Best For | Strength |
|---|---|---|
| Bolted (snug-tight) | Light loads, temporary | 60-70% |
| Bolted (slip-critical) | Heavy, dynamic loads | 80-90% |
| Welded (fillet) | Moment connections | 90-100% |
| Welded (full penetration) | Critical connections | 100% |
Welding Considerations
- Preheat required for thick sections (>30mm)
- Use low-hydrogen electrodes for high-strength steel
- Control heat input to prevent distortion
- Inspect with ultrasonic testing (UT) for critical connections
Cost Considerations
Price Factors
| Factor | Impact |
|---|---|
| Size | Larger sections cost more per kg (due to rolling complexity) |
| Grade | Higher grades add 10-30% to base price |
| Length | Standard lengths (6m, 12m) cheapest; custom lengths add cutting fee |
| Quantity | Volume discounts (10+ tons significantly cheaper) |
| Finish | Mill scale (cheapest) vs. primed vs. galvanized (+20-50%) |
| Location | Proximity to mill reduces freight |
Approximate Price Range (2024 Estimates)
| Size | Price per metric ton (USD) |
|---|---|
| Small (100-200mm) | $700 – $900 |
| Medium (200-400mm) | $650 – $850 |
| Large (400-600mm) | $600 – $800 |
| Extra large (600mm+) | $700 – $950 |
| High strength (Q355/S355) | +$50 – $100/ton |
| Weathering steel | +$200 – $300/ton |
| Hot-dip galvanized | +$300 – $500/ton |
Note: Prices vary significantly by region, quantity, and market conditions.
Quality Inspection Checklist
Visual Inspection
- Straightness (no visible bowing or sweeping)
- Flange parallelism (parallel within tolerance)
- Surface defects (laps, seams, cracks)
- Mill markings (size, grade, heat number)
Dimensional Inspection
- Height (H) ±2mm tolerance
- Flange width (B) ±2mm
- Web thickness (t_w) ±0.5mm
- Flange thickness (t_f) ±0.8mm
- Length ±50mm (standard)
- Squareness of cut ends
Material Certification
- Mill Test Certificate (MTC) / Certificate of Analysis
- Chemical composition within grade limits
- Mechanical test results (tensile, yield, elongation)
- Heat number traceability
Common Problems and Solutions
| Problem | Cause | Solution |
|---|---|---|
| Beam deflection | Undersized section | Increase size or add stiffeners |
| Lateral-torsional buckling | Insufficient bracing | Add intermediate braces |
| Web crippling | Concentrated load without stiffener | Add web stiffeners |
| Flange local buckling | Flange too thin for load | Use heavier flange section |
| Welding distortion | Excessive heat input | Use balanced welding sequence |
| Corrosion | Lack of protection | Apply coating or use weathering steel |
Sustainability and Environmental Impact
Positive Aspects
- ✅ 100% recyclable – Steel is infinitely recyclable without loss of properties
- ✅ High recycled content – Typical H-beam contains 30-40% recycled steel
- ✅ Long lifespan – 50-100+ years with proper maintenance
- ✅ Energy efficient – Hot rolling uses less energy than casting
Negative Aspects
- ❌ High embodied carbon (1.8-2.0 kg CO₂ per kg of steel)
- ❌ Mining impacts (iron ore, coal)
- ❌ Energy-intensive production
Improvements
- Electric arc furnace (EAF) production uses 100% scrap (lower carbon)
- Hydrogen-based steelmaking (emerging technology)
- Carbon capture at integrated mills
