
Anti Corrosion Coating Q355b S275jr Q235B Gymnasium Prefab Steel Structure Building. Rapid Construction: Modular prefabricated components reduce on-site construction time by 40-60%. Column-Free Space: High-strength steel frames enable wide spans for basketball, volleyball, and multi-purpose halls. Seismic & Wind Resistance: Engineered with Q355/S355/Q460 steel for outstanding earthquake and wind resistance. High-Precision Fabrication: CNC cutting and automated welding based on TEKLA/BIM models ensure accurate fit-up. Durable Surface Protection: Sandblasted to Sa2.5 with epoxy primers, PU topcoats, or hot-dip galvanizing for 30-50+ years life. Eco-Friendly Design: 100% recyclable structural steel compatible with solar panels and smart building systems. Customization Options: Full customization, minor customization, and flexible customization available from designs. ISO Certified Quality: Strict quality control with ISO 3834, EN 1090, and AWS D1.1 certifications.