A Q345B grade 400×200 Steel H Beam is a structural steel section widely used in modern construction and engineering projects. Manufactured using hot-rolled technology, this H-shaped beam offers excellent mechanical properties, superior load-bearing capacity, and high resistance to deformation-making it ideal for both building frameworks and industrial structures.
1. Understanding Q345B Steel Grade
Q345B is a low-alloy, high-strength structural steel commonly used in China. The letter "Q" stands for yield strength, and 345 represents the minimum yield strength of 345 MPa. Compared with carbon steel such as Q235 or SS400, Q345B offers:
Higher strength-to-weight ratio
Better weldability
Improved impact resistance at low temperatures
Enhanced durability for long-term structural applications
2. Size Specification: 400×200 H Beam
The designation 400×200 refers to the height (H) of 400 mm and flange width (B) of 200 mm. H beams are characterized by parallel flanges and uniform thickness, which provide a more efficient cross-sectional distribution and stable performance under heavy loads.
This size is commonly used in:
Multi-story commercial building columns
Steel bridges
Large-span industrial workshops
Shipbuilding and offshore structures
3. Production Technique
Hot Rolled Technology
Our Q345B steel H beams are produced through a hot-rolling process, ensuring:
Smooth surface quality
Excellent internal structure integrity
Consistent mechanical strength
Easy cutting, welding, drilling, and processing
4. Available Grades and Standards
The product also supports multiple equivalent international grades, including:
| China | US | EU | Japan | Korea |
|---|---|---|---|---|
| Q235 / Q345 | A36 / A992 / A572 Gr50 | S235 / S275 | SS400 / SS490 | - |
These equivalent standards enable flexible applications worldwide and simplify material selection for global projects.
5. Packaging & Delivery
MOQ: 20 Metric Tons
Packaging: Bundled with firm steel straps for safe loading, unloading, and transportation
Monthly Supply Ability: 50,000 Metric Tons-ensuring stable and continuous supply for large-scale orders