S235jr S235jo S275jr S275jo Building Structure H Beam

S235jr: A cost-effective, versatile grade with a minimum yield strength of 235 MPa and tensile strength ranging from 360–510 MPa. The "jr" suffix indicates it meets toughness requirements (minimum 27 J impact energy) at room temperature (20°C), making it ideal for indoor building components or outdoor structures in mild climates. Its excellent formability allows for easy cutting, bending, and welding, fitting seamlessly into residential, commercial, and light industrial building frames-such as floor joists, roof trusses, and non-load-bearing wall supports.​

S235jo: Sharing the same yield (235 MPa) and tensile (360–510 MPa) strength as S235jr, S235jo stands out for enhanced low-temperature toughness. The "jo" suffix requires a minimum 27 J impact energy at 0°C, making it suitable for building structures in regions with cool to moderately cold climates (e.g., temperate European countries). It is commonly used in exterior building elements like facade frames, balcony supports, and outdoor canopies, where resistance to temperature fluctuations and occasional low temperatures is essential.​

S275jr: A medium-strength grade with a higher minimum yield strength (275 MPa) and tensile strength range (410–560 MPa) compared to S235 series. The "jr" designation ensures 27 J impact energy at 20°C, offering increased load-bearing capacity for mid-rise buildings, heavy-duty commercial structures, and industrial facilities. It excels in supporting heavier components like concrete slabs, mechanical equipment platforms, and primary building columns, where higher strength is needed without compromising fabrication ease.​

S275jo: Combining the medium strength of S275jr (275 MPa yield strength, 410–560 MPa tensile strength) with improved low-temperature performance, S275jo requires 27 J impact energy at 0°C. This makes it a top choice for mid-rise and large-span buildings in cold climates (e.g., northern Europe, high-altitude regions), where structural components must withstand freezing temperatures. It is widely used in long-span roof girders, load-bearing walls for multi-story buildings, and industrial building frames exposed to outdoor conditions.​

All four grades exhibit excellent weldability, compatible with standard welding processes (SMAW, GMAW, FCAW) without the need for pre-heating for sections up to 30 mm thick. This simplifies on-site fabrication, reduces construction time, and ensures strong, durable joints that meet EN 1011-2 welding standards-critical for maintaining building structural integrity.​

Structural Advantages for Building Applications​

The H-beam's iconic cross-sectional design, paired with the properties of S235 and S275 series steel, delivers unique benefits for building structures:​

Efficient Load Distribution: The wide, flat flanges and thick central web of the H-beam evenly distribute bending moments, shear forces, and axial loads. This allows the beams to support building loads (occupancy, furniture, equipment, snow, wind) with minimal deflection, ensuring stable floors, roofs, and walls-even in large-span spaces like auditoriums or warehouse interiors.​

Space Optimization: With a high strength-to-weight ratio, these H-beams provide sufficient load capacity without excessive bulk. This reduces the overall weight of the building structure, minimizes the size of supporting foundations, and frees up interior space for functional use (e.g., higher ceiling heights, larger open floors)-a key advantage for modern commercial and residential buildings.​

Design Versatility: Available in a range of standard cross-sectional dimensions (e.g., Hea, Heb, Heg series per EN 10034), these H-beams can be tailored to fit diverse building designs. From lightweight residential frames (using smaller Hea-series H-beams with S235jr) to heavy-duty industrial building columns (using larger Heb-series H-beams with S275jo), they adapt to varying project scales and requirements.​

Quality Compliance & Application Scope​

Our S235jr, S235jo, S275jr, S275jo H-beams undergo strict quality control to meet EN 10025-2 and EN 10034 (for H-section dimensions) standards:​

Material Testing: Includes chemical composition analysis (to verify compliance with EN 10025-2 elemental requirements), tensile testing (to confirm yield and tensile strength), bend testing (to assess ductility), and impact testing (at specified temperatures: 20°C for "jr" grades, 0°C for "jo" grades) to ensure toughness.​

Dimensional Inspection: Uses precision tools (laser scanners, calipers) to check cross-sectional accuracy (flange width, web thickness, height), length tolerance (standard lengths: 6–15 m, custom lengths available), and surface quality (free from cracks, scales, or deformities).​

Non-Destructive Testing (NDT): Ultrasonic testing (UT) detects internal flaws in the web and flanges, while visual inspection ensures surface integrity-meeting EN 10160 quality levels for structural steel.​

These H-beams are widely applied in building structures across sectors:​

Residential Construction: S235jr H-beams for floor frames, roof trusses, and garage supports; S235jo for exterior balcony frames in cool climates.​

Commercial Construction: S275jr H-beams for shopping mall columns, office building floor beams, and hotel lobby roofs; S275jo for large-span commercial complexes in cold regions.​

Light Industrial Construction: S275jr and S275jo H-beams for small factory frames, warehouse storage platforms, and workshop mezzanines-supporting light to medium equipment loads.