Equivalent bs en Q355B VS S355JR H Beam

Q355B H-section steel is a new high-strength low-alloy structural steel grade defined in the latest Chinese steel standard GB/T1591-2018. Prior to this standard, Q355B was known as Q345B in the previous GB/T1591 version.

Q355B H-section steel

Compared with the earlier grade, Q355B H Beams feature optimized mechanical properties, tighter chemical composition control, and improved weldability, making them ideal for modern construction, bridges, machinery, and large-scale industrial structures that demand high-performance steel.

S355JR Structural Steel Beams fall under the European and British standard BS EN10025-2, widely applied in industrial plants, bridges, ports, and large mechanical structures.

Q355B H-section steel

A detailed comparison of chemical composition and mechanical properties shows that Q355B H-section steel and S355JR H Beams are fully equivalent in yield strength, tensile strength, and impact toughness, allowing engineers to interchange them in design, construction, and load-bearing applications.

This equivalence between Q355B H Beams and S355JR Structural Steel Beams offers flexibility in material selection for both domestic and international projects, ensuring compliance with different national standards.

Engineers can choose either Q355B or S355JR H Beams based on project requirements, guaranteeing structural safety, ease of construction, consistent material supply, and cost efficiency.

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S355JR steel is also equivalent to international standard steels such as ASTM A572 Grade 50, DIN 17100 St50-2, and JIS G3101 SS540.

Our S355JR H Beams are manufactured with tight dimensional tolerances to ensure precise structural performance. The height tolerance is ±2 mm, the flange width tolerance is ±2 mm, and the web thickness tolerance is ±1 mm.

Similarly, our Q355B H-section steel meets the same high standards, providing height tolerance ±2 mm, flange width ±3 mm, and web thickness ±1 mm, making it ideal for projects where accuracy and fit are critical.

By offering steel beams with smaller tolerances, we help engineers achieve better assembly precision, improved structural stability, and easier integration with other components.

For all sizes of S355JR and Q355B H Beams, our strict tolerance control ensures reliable performance, reduced material waste, and faster construction efficiency.

As a S355JR and Q355B H Beams manufacturer, we deliver all standard sizes with reduced tolerances, helping you optimize materials, reduce waste, and accelerate construction.

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Is S355 equivalent to A36?

S355JR and A36 are not directly equivalent, as S355JR has higher strength (yield 355 MPa vs. A36's 250 MPa) and guaranteed impact toughness, making it closer to ASTM A572 Grade 50 than A36. A36 is often equivalent to S235JR (yield 235 MPa), a lower EN grade.

What is the American equivalent of S355 steel?

ASTM has identified A572-50 as an acceptable substitution for S355. Both grades have similar chemical compositions and are high-strength, low-alloy structural steels.

Can S355 be hardened?

S355 is not ideally suited to hardening, though it can be subjected to limited heat treatment process such as case hardening.

What is the difference between ASTM A572 and S355?

Applications: ASTM A572 Grade 50 is commonly used in heavier construction applications requiring higher strength, while S355JR is versatile and widely used in various structural applications across Europe.