Q: What are the performance changes of Q235 at high temperatures?
A: Strength is basically stable at ≤300℃; strength decreases significantly at >550℃, requiring fire protection (such as coating or concrete wrapping).
Q: Is Q235 resistant to low temperatures? How to choose between different grades?
A: A. Not resistant to low temperatures; B. Suitable for normal temperatures; C. Suitable for 0℃ and above; D. Suitable for -20℃ and above. Grades C and D are preferred in northern winters or extremely cold regions.
Q: What are the applicable scenarios for Q235 A, B, C, and D in construction?
A: A. Used for temporary structures and non-critical components under static loads; B. Used for normal temperature factories, beams and columns of civil buildings, and ordinary steel structures; C. Used for construction in northern winters and components in low-temperature environments; D. Used for outdoor structures in the extremely cold regions of Northeast and Northwest China.
Q: Can Q235 be used in the load-bearing structures of high-rise buildings?
A: It can be used in the non-core areas of multi-story or mid-rise buildings; Q355 and above or Z-direction steel are recommended for the core tubes and transfer layers of super high-rise buildings.
Q: What building profiles can Q235 be processed into?
A: I-beams, channel steel, angle steel, H-beams, steel plates, steel pipes, reinforcing bars, bolts, rivets, etc.