Q345GJ (High-Strength Building Steel) is suitable for banks?
A: Yes. Q345GJB/GJC/GJD is specifically designed for high-rise/large-span structures, featuring a low yield strength ratio, Z-direction tear resistance, and good low-temperature toughness, making it suitable for high-rise bank main buildings, large-span lobby halls, and vaults.
What are the weldability properties of Q345?
A: Good weldability, moderate carbon equivalent, suitable for manual welding, submerged arc welding, and gas shielded welding; thick plates/low-temperature applications require **preheating to 100–150℃** to prevent cracking.
Is Q345 used for bank building columns?
A: Yes. Q345 columns have high load-bearing capacity, small cross-sections, and increased usable area, making them suitable for high-rise banks, large-span lobby halls, and vault areas.
What are the advantages of using Q345 for beams/trusses?
A: High strength, light weight, low deflection, commonly used in large-span lobby halls, vault roofs, and transfer floors, offering better seismic and impact resistance.
Q345 steel sheet is used for bank floor/roof slabs?
Answer: Q345 profiled steel sheet is commonly used for steel decking + concrete composite floor slabs. It has high rigidity, fast construction, and good fire resistance, meeting the high load requirements of vaults (≥6kN/m²).