Q355GNH H-beams are high-quality Chinese GB standard weathering structural steel products manufactured in accordance with GB/T 4171. Our company maintains long-term and stable cooperation with major steel associations and leading steel mills across China, ensuring consistent supply, reliable quality, and competitive pricing of Q355GNH H-beams.
Our Q355GNH H-beam products have been exported to over 70 countries and regions worldwide and have earned strong market recognition and positive customer feedback.
Application of Q355GNH H-Beams
High-weathering structural steel
Bridges and overpasses
Steel towers and transmission structures
Containers and transportation equipment
Outdoor load-bearing steel frameworks
Q355GNH H-beams are especially suitable for structures exposed to harsh atmospheric conditions.
Heat Treatment Condition
Heat treatment temperature: 1754°C – 1967°C
Typical delivery conditions include solution treatment, aging, annealing, ausaging, and quenching & tempering (Q&T).
Mechanical Properties of Q355GNH H-Beams (GB/T 4171)
Q355GNH H-beams exhibit excellent comprehensive mechanical performance, ensuring structural safety and long-term durability.
Tensile strength: 570–700 MPa
Yield strength: ≥ 195 MPa
Elongation after fracture: approx. 12%
Lateral expansion: up to 22 mm
Notch impact energy: ≥ 34 J
Cold bending performance: Good, with bending radius ≥ 4 times beam width
Typical Mechanical Property Values
| Yield Strength Rp0.2 (MPa) | Tensile Strength Rm (MPa) | Impact Energy KV/Ku (J) | Elongation A (%) | Reduction of Area Z (%) | Brinell Hardness (HBW) |
|---|---|---|---|---|---|
| ≥ 378 | ≥ 659 | 34 | 12 | 12 | 134 |
Physical Properties of Q355GNH H-Beams
The physical characteristics of Q355GNH H-beams include density, Poisson's ratio, thermal conductivity, specific heat capacity, thermal expansion coefficient, elastic modulus, and electrical resistivity.
| Temperature (°C) | Modulus of Elasticity (GPa) | Thermal Expansion Coefficient (10⁻⁶/°C) | Thermal Conductivity (W/m·°C) | Specific Heat (J/kg·°C) | Electrical Resistivity (Ω·mm²/m) | Density (kg/dm³) | Poisson's Ratio |
|---|---|---|---|---|---|---|---|
| 14 | - | - | - | - | - | - | 0.21 |
| 269 | 886 | - | 41.3 | 432 | - | - | - |
| 919 | - | 12 | 22.2 | - | 234 | 7.85 | 0.143 |
Q355GNH H-beams combine high strength, excellent atmospheric corrosion resistance, and stable mechanical performance, making them an ideal solution for long-life outdoor steel structures.
Their cost-effective alloy design offers superior durability compared to carbon steel while remaining more economical than stainless steel.
