Product Overview
Q345B hot-rolled H-shaped steel features wide flanges, high lateral rigidity, and excellent bending resistance (5–10% higher than standard I-beams).
Its parallel flange surfaces and optimized cross-sectional distribution provide superior strength-to-weight ratio, making it ideal for structural applications where efficiency, durability, and ease of installation are critical.
Applications
Q345B H-Beams are widely used in:
Beam and column members for industrial and civil building structures
Load-bearing brackets for steel structures
Steel piles and underground supporting structures
Industrial equipment frameworks (petrochemical, electric power, etc.)
Long-span steel bridges
Shipbuilding and heavy machinery frames
Girder brackets for trains, cars, and tractors
Port conveyor belts, expressway baffle supports, and dam engineering
Specifications & Standards
Material Standards: Q345B carbon steel, ASTM A36/A572/A992, EN S235JR/S355JR/S450J0, JIS SM490B
Production Method: Hot-rolled H-shaped steel
Compliance: BS EN 10365-2017 (replacing EN10034-1993)
Dimensions
Available in a variety of standard and jumbo sizes, with precise tolerances:
Jumbo H-Beams Example (mm x mm x kg/m):
| Designation | h (mm) | b (mm) | s (mm) | t (mm) | Area (cm²) | Ix (cm⁴) | Iy (cm⁴) | ix (cm) | iy (cm) | Zx (cm³) | Zy (cm³) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1016x305x222 | 970.3 | 300.0 | 16.0 | 21.1 | 282 | 406,500 | 9,501 | 37.95 | 5.80 | 8,380 | 633 |
| 1016x305x314 | 1000.0 | 300.0 | 19.1 | 35.9 | 400 | 644,700 | 16,280 | 40.15 | 6.38 | 12,890 | 1,085 |
| 1016x305x584 | 1056.0 | 314.0 | 36.0 | 64.0 | 744 | 1,246,100 | 33,430 | 40.93 | 6.70 | 23,600 | 2,130 |
IPE & Japanese I-Sections are also available for specialized applications.
Advantages of Q345B H-Beams
High Strength & Lightweight: Optimized for structural stability while reducing material usage
Flexible & Fast Construction: Suitable for all-weather installation, easy to connect, dismantle, and reuse
Earthquake & Disaster Resistant: Ideal for seismic regions and high-temperature industrial plants
Excellent Surface Quality: Low residual stress, good appearance, and superior plasticity
Production Capacity & Quality
Full range of steel types: carbon, low-alloy, weather-resistant, and structural steel for hulls
Advanced manufacturing: automatic continuous rolling, laser cutting, precise straightening
Large output: 8 production lines, 1,600 tons daily
Q345B H-beams provide high efficiency, strength, and reliability for industrial, civil, and highway construction projects. With diverse specifications and compliance with international standards, they are the ideal choice for engineers seeking durable and cost-effective structural solutions.
