Q355b Hot Rolled H-Section Steel 200*200 400*400mm Steel Structural Beam and Column Structural Steel H-Beam

Our Q355b hot rolled H-section steel stands as a high-performance choice for critical structural applications, specifically engineered as beams and columns to support heavy loads and ensure long-term stability. Available in two widely used standard sizes-200*200mm and 400*400mm-this structural steel combines the superior mechanical properties of Q355b alloy steel with the precision of hot rolling technology, making it ideal for construction, infrastructure, and industrial projects requiring reliability and strength.

1. Premium Q355b Material: Strength & Toughness for Demanding Scenarios

Q355b is a low-alloy high-strength structural steel grade that exceeds the performance of general carbon steel, delivering key advantages for structural use:

Exceptional Strength: Boasts a minimum yield strength of 355 MPa and tensile strength of 470-630 MPa, enabling it to withstand heavy vertical compression (for columns) and horizontal bending forces (for beams) without deformation.

Superior Toughness: Designed with excellent low-temperature impact resistance (suitable for -40℃ environments), it maintains structural integrity even in harsh weather or industrial conditions-critical for outdoor infrastructure or heavy-duty plant structures.

Excellent Weldability & Fabrication: The alloy composition of Q355b ensures strong, consistent welds (compatible with common welding methods like arc welding and MIG welding) and easy fabrication (cutting, drilling, bending), reducing on-site construction time and labor costs.

Corrosion Resistance: Naturally resistant to mild atmospheric corrosion, with optional surface treatments (e.g., hot-dip galvanizing, anti-rust painting) available to extend service life in high-humidity or coastal environments.

2. Key Sizes: 200200mm & 400400mm for Targeted Applications

The two standard H-section sizes are optimized for different structural roles, ensuring a perfect fit for diverse project scales:

200*200mm H-Section Steel: A medium-sized profile with balanced flange width (200mm) and web thickness (typically 8-10mm). Ideal for secondary structural beams (e.g., floor beams in residential/commercial buildings, roof trusses) and lightweight columns (e.g., interior support columns in small industrial workshops, prefabricated warehouses). Its compact design saves space while providing sufficient load capacity for mid-rise or small-span projects.

400*400mm H-Section Steel: A heavy-duty profile with wider flanges (400mm) and thicker webs (typically 13-16mm), offering maximum load-bearing capacity. Designed for primary structural components such as main beams (e.g., bridge girders, large factory roof main beams) and heavy columns (e.g., high-rise building core columns, crane support columns). It excels in large-span (over 10 meters) or high-load projects where structural safety is non-negotiable.

3. Hot Rolling Advantage: Quality & Precision You Can Rely On

All Q355b H-section steel is manufactured via advanced hot rolling technology, ensuring unmatched quality and performance:

Uniform Structural Integrity: Hot rolling heats steel to above its recrystallization point (over 1000℃) and shapes it through precision rollers, creating a dense, uniform grain structure that eliminates internal stress. This minimizes the risk of cracking or deformation under long-term use.

Strict Dimensional Accuracy: Adheres to international standards (e.g., GB/T 11263 for H-section steel) with tight tolerances for flange width, web thickness, and cross-sectional straightness. This ensures easy on-site assembly, compatibility with prefabricated components, and consistent load distribution across the structure.

Smooth Surface Finish: The hot rolling process produces a clean, burr-free surface that requires minimal post-processing, reducing project costs and ensuring a professional appearance for exposed structural elements.

4. Versatile Applications Across Industries

This Q355b hot rolled H-section steel is a staple in key sectors, trusted for its reliability:

Building Construction: High-rise residential/commercial buildings (columns, floor beams), stadiums (roof main beams), and shopping malls (support columns).

Infrastructure: Highway/railway bridges (main girders), tunnel supports, and port terminals (heavy-duty columns).

Industrial Manufacturing: Large-scale factory frames (crane beams, equipment support columns), power plant structures, and steel workshops.

Prefabricated Construction: Modular housing (load-bearing columns) and prefabricated warehouses (roof beams).

Every batch undergoes rigorous quality control, including chemical composition testing (to verify Q355b alloy content), mechanical property testing (tensile, impact, bending), and dimensional inspection. Customization options-such as non-standard lengths (up to 18 meters), special surface treatments, or drilled holes-are available to meet unique project blueprints.