Q: How to perform anti-corrosion treatment on Q235 steel?
A: For dry indoor environments, a thin primer coat is sufficient; for outdoor/humid/coastal environments, the following steps are required: rust removal → primer → intermediate coat → topcoat; or hot-dip galvanizing, or a composite protection of galvanizing and coating.
Q: What are the fire protection measures for Q235 steel structures?
A: Apply fire-retardant coatings (thin/thick), wrap with fireproof boards, or encase in concrete to ensure the fire resistance rating meets design requirements (e.g., 2.5h for columns, 1.5h for beams).
Q: What are the common failure modes of Q235 steel during use? How to avoid them?
A: Common failure modes include plastic deformation, brittle fracture, corrosion, and fatigue failure. Prevention: Select materials and design according to specifications, strictly control construction quality, implement proper anti-corrosion and fire prevention measures, and perform regular maintenance.
Q: Can Q235 steel be used in coastal or chemically corrosive environments?
A: Yes, but enhanced anti-corrosion measures are necessary (e.g., heavy-duty anti-corrosion coating, hot-dip galvanizing + sealing paint), and regular inspection and maintenance are required; otherwise, it is prone to rust.
Q: What is the typical design service life of Q235 steel structures?
A: Under normal maintenance, the service life is generally 50 years for buildings; 5-10 years for temporary structures; in corrosive environments, the service life needs to be shortened or the protection upgraded.