Q: How to choose between Q235 and Q355 in construction?
A: Q235 is lower in cost and suitable for general loads; Q355 has higher strength and a smaller cross-section under the same load, making it suitable for heavy loads, large spans, and high-rise buildings, but it is 20%-30% more expensive.
Q: Can Q235 be used in seismic-resistant structures? What should be noted?
A: Yes, but grade B or higher must be selected to ensure impact toughness. Joint design must meet seismic requirements to avoid brittle failure.
Q: What are the thickness requirements for Q235 used in steel structure columns and beams?
A: Determined by calculation, when the thickness is ≥40mm and subjected to tensile force in the thickness direction, Z-direction steel (Z15/Z25/Z35) should be selected to control lamellar tearing.
Q: What can Q235 be used for in concrete structures?
A: It can be used as reinforcing bars, embedded parts, and steel-concrete connection joint accessories.
Q: Can Q235 be used in bridge structures? A: Suitable for non-critical parts of small and medium span bridges; for large span, heavy load or low temperature bridges, Q355 or higher or weathering steel is recommended.