Q: Is Q235 corrosion-resistant?
A: It is corrosion-resistant in normal environments, but requires rust prevention treatment in humid/acidic/alkaline environments.
Q: What are the common methods for rust prevention of Q235?
A: Painting, galvanizing, powder coating, and regular maintenance.
Q: Can Q235 be strengthened by heat treatment?
A: Low-carbon steel has poor heat treatment effects and is generally not subjected to strengthening heat treatment.
Q: What is the allowable stress of Q235?
A: According to design specifications, it is generally taken as 140-170MPa, depending on the working conditions.
Q: Which is more suitable for load-bearing, Q235 or Q355?
A: Q355 has higher strength and is the preferred choice for large-span/heavy-load structures.