Overview of Q345 H-Beam
Q345 H-beam is a type of structural steel beam made from Q345 grade carbon steel, known for its high strength, excellent weldability, and good toughness.
The H-beam features an H-shaped cross-section with a vertical web and two horizontal flanges, making it ideal for load-bearing applications in heavy construction and industrial projects.
Material Composition
Q345 steel typically contains:
Carbon (C): ≤ 0.20%
Manganese (Mn): 1.00–1.60%
Phosphorus (P): ≤ 0.035%
Sulfur (S): ≤ 0.035%
Silicon (Si): 0.20–0.55%
Other Elements (Cr, Ni, Cu, etc.): Small amounts for improved strength and toughness
This composition gives Q345 superior mechanical properties compared to lower-grade steels such as Q235, making it suitable for heavy-duty structural applications.
Mechanical Properties
Yield Strength: 345 MPa
Tensile Strength: 490–665 MPa
Elongation (A): 20%
Modulus of Elasticity (E): 210 GPa
Hardness: 130–200 HB
Impact Toughness: High resistance to low temperatures and impact forces
Geometry & Dimensions
Shape: H-shaped cross-section (vertical web + two horizontal flanges)
Web Thickness (t_w): Varies by size
Flange Thickness (t_f): Varies by size
Height (h) & Width (b): Varies by size
Typical Sizes:
100×100×6×9 mm
200×100×8×12 mm
300×150×10×15 mm
400×200×12×20 mm
500×250×15×25 mm
Applications
Heavy Construction Projects: Large buildings, bridges, and load-bearing frames
Industrial Structures: Power plants, factories, and steel mills
Transportation Infrastructure: Railway bridges, highway overpasses, and heavy vehicle supports
Towers & Cranes: Elevated structures requiring strong load-bearing capacity
Advantages
High Strength: Yield strength of 345 MPa ensures robust performance in heavy-duty applications
Durability: Resistant to wear, deformation, and impact, suitable for demanding environments
Versatile: Widely used across industrial, commercial, and infrastructure projects
Cost-Effective: Offers superior performance and long-term durability compared to lower-grade steels