Q295GNH High-Tensile Corten Steel is a premium weathering steel engineered for critical tower infrastructure, adhering to GB/T 4171-2008 standards . Specifically designed for high-stress applications, this alloy combines exceptional tensile strength, fatigue resistance, and corrosion protection, making it ideal for transmission towers, communication masts, and offshore lighthouses exposed to harsh environmental conditions.
Core Engineering Properties
Alloy Composition: Contains Cu (0.25-0.45%), Cr (0.30-0.65%), and Ni (0.25-0.50%) , forming a self-healing rust layer (α-FeOOH) that reduces corrosion rates by 2-8 times compared to conventional carbon steel . Phosphorus (0.07-0.12%) enhances resistance to acidic atmospheres, while controlled carbon (≤0.12%) ensures weldability and ductility .
Mechanical Performance: Yield strength ≥295 MPa (thickness ≤16mm), tensile strength 430-560 MPa, and elongation ≥24% , ensuring load-bearing capacity under dynamic wind and seismic loads. Impact resistance: ≥34J at -20℃ (Grade A) to ≥27J at -40℃ (Grade E) , meeting extreme climatic requirements.
Fatigue & Corrosion Resistance
Fatigue Endurance: Optimized for cyclic loading with fatigue strength up to FAT80-FAT90 (Eurocode 3) , making it suitable for high-vibration environments like transmission towers.
Salt Spray Performance: Exhibits minimal corrosion under ASTM B117 testing (5% NaCl solution), with corrosion rates ≤0.1 mm/year after 1000 hours , critical for coastal or de-iced tower applications.
Acid Resistance: Resists sulfuric acid environments (e.g., 70℃ 50% H₂SO₄) with corrosion rates ≤14 mg/cm²·h , ideal for industrial zones with chemical exposure.
Standards & Compliance
Certifications: Compliant with GB/T 4171-2008 and optional EN 10025-5 for international projects .
Quality Assurance: Each batch undergoes ultrasonic testing, chemical analysis, and salt spray verification .
Environmental & Economic Benefits
Sustainability: Recyclable at end-of-life and reduces VOC emissions by eliminating paint coatings .
Cost Efficiency: Lower maintenance and longer service life offset higher initial costs, with payback periods typically within 5-7 years .
FAQ
1. Q: What is Q295GNH High-Tensile Corten Steel designed for?
A: It's engineered for critical tower infrastructure like transmission towers, communication masts, and offshore lighthouses.
2. Q: What key alloy elements form its protective rust layer?
A: Cu (0.25–0.45%), Cr (0.30–0.65%), and Ni (0.25–0.50%) create a self-healing α-FeOOH layer.
3. Q: What is its yield strength for thickness ≤16mm?
A: The yield strength is ≥295 MPa, with tensile strength 430–560 MPa and elongation ≥24%.
4. Q: How does it perform in salt spray tests?
A: It shows ≤0.1 mm/year corrosion after 1000 hours in 5% NaCl solution (ASTM B117).
5. Q: What environmental benefit does it offer?
A: It's recyclable and reduces VOC emissions by eliminating paint coatings.
