1.What are the typical applications of Q235B galvanized steel sheets and ordinary steel sheets in outdoor exposure scenarios?
Ordinary steel plate: almost no application (except for short-term temporary enclosure, which requires additional anti-rust paint)
Q235B galvanized sheet: factory roofs/walls (color steel tile base material), municipal road guardrails, building exterior wall decorative keels, outdoor billboard brackets, roof ventilation caps
2.In humid/high humidity scenarios, what are the differences between the applications of Q235B galvanized steel sheets and ordinary steel sheets?
Q235B galvanized steel sheet: Underground garage ventilation ducts, bathroom/kitchen exhaust ducts, metal supports for basement equipment rooms, roof drainage gutters
Ordinary steel sheet: Temporary support in dry indoor areas, non-load-bearing partition wall keels (requires painting)
3.What is the difference between the application of Q235B galvanized steel sheet and ordinary steel sheet in long-term load-bearing/safety structures?
Q235B galvanized steel sheet: Light steel structure platforms (such as multi-level workshop work platforms), balcony handrails/security windows in civil buildings, and warehouse shelf columns.
Ordinary steel sheet: Non-load-bearing components in dry indoor environments (such as indoor partition frames and temporary operating tables).
4.Q235B What is the difference in maintenance cost between galvanized steel sheet and ordinary steel sheet?
Q235B galvanized steel sheet: A "corrosion-resistant material," requiring virtually no maintenance after installation. Surface dust and debris only need to be cleaned regularly (e.g., every 1-2 years) to prevent the zinc layer from being covered by accumulated dirt. Even in coastal areas, no repainting or rust removal is required for 5 years, resulting in extremely low lifetime maintenance costs (approximately 1/5-1/10 of those of ordinary steel sheet).
Ordinary steel sheet: A "post-corrosion-resistant material," requiring additional anti-corrosion measures (such as anti-rust paint or coating) after installation, and frequent maintenance is required:
Indoor dry environments: Rust removal and repainting are required every 3-5 years to prevent rust spots from forming.
Outdoor/humid environments: Maintenance is required every 1-2 years. Failure to maintain timely maintenance can lead to "rust-through" (e.g., roof sheet leaks, guardrail fractures), necessitating replacement of the entire component, which incurs additional costs. (For example, if a roof leak damages interior finishes, the repair cost far exceeds the steel sheet itself.)
5.Q235B What is the difference in service life between galvanized steel sheets and ordinary steel sheets in the construction field?
Q235B galvanized steel sheet: In construction applications, it offers a stable lifespan of 10-15 years for outdoor use (e.g., color-coated steel sheets on factory roofs) and 15-20 years for indoor humid environments (e.g., pipes in underground garages). With additional coatings (e.g., color-coated galvanized steel sheet), the lifespan can be extended to 20-30 years, meeting the short- to medium-term needs of building components.
Ordinary steel sheet: Without professional corrosion protection (e.g., simply applying standard anti-rust paint), its lifespan is only 3-5 years outdoors and 5-8 years in humid indoor environments. Even with standard corrosion protection, the lifespan is only extended to 8-12 years, far lower than that of galvanized steel sheet. Furthermore, ordinary steel sheet rusts from the inside out. Even if the surface paint layer is intact, rust may have already penetrated the interior, posing the risk of "hidden failure" (e.g., sudden breakage of balcony handrails).