What scenarios are unsuitable for Q235?
A: Heavy loads, high temperatures (>250℃), strong corrosion, ultra-high strength, and critical dynamic load-bearing applications.
What is the difference between Q235 and HRB335/400?
A: Q235 is carbon structural steel (section steel/plate); HRB is hot-rolled ribbed steel bar (for concrete).
What is the service life of Q235?
A: 30-50 years with normal anti-corrosion maintenance; 10-20 years in corrosive environments (requires enhanced anti-corrosion treatment).
What are the price advantages of Q235?
A: 10-15% lower than Q355, lower processing/welding costs, and higher cost-effectiveness.
What are the future application trends for Q235?
A: Still the mainstream for general buildings; important/heavy-load/high-rise buildings will gradually upgrade to Q355; low-carbon and high-performance development is expected.