Q295GNH Weather Resistant Steel: Perfect For Outdoor Structures
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Gnee Steel (Tianjin) Co., Ltd. is one of the most professional q295gnh weather resistant steel: perfect for outdoor structures manufacturers and suppliers in China. Welcome to wholesale customized q295gnh weather resistant steel: perfect for outdoor structures at competitive price from our factory. Good service and quality products are available.
Products Description
Q295GNH is a premium-grade weather-resistant steel engineered to excel in outdoor environments, adhering to GB/T 4171-2008 and GB/T 1591-2008 standards . Its advanced alloy design integrates corrosion resistance, high tensile strength, and architectural versatility, making it ideal for bridges, high-rise facades, urban sculptures, and industrial infrastructure exposed to rain, UV radiation, and coastal salt mist.
Material Science & Corrosion Resistance
Alloy Composition: Contains Cu (0.25-0.45%), Cr (0.30-0.65%), and Ni (0.25-0.50%) , forming a dense α-FeOOH oxide layer that reduces corrosion rates by 2-8 times compared to conventional carbon steel . Phosphorus (0.07-0.12%) enhances resistance to acidic rain, while controlled carbon (≤0.12%) ensures weldability and ductility .
Self-Healing Patina: Over time, exposure to moisture and oxygen triggers the formation of a 50-100μm thick rust patina , acting as a natural barrier against chloride ingress in coastal areas and sulfur dioxide in urban environments. This eliminates the need for paint coatings, reducing maintenance costs by 50% .
Mechanical & Thermal Performance
Structural Integrity:
Yield strength ≥295 MPa (thickness ≤16mm), tensile strength 430-560 MPa, and elongation ≥26% , ensuring load-bearing capacity under dynamic wind and seismic loads.
Impact resistance: ≥34J at -20℃ (Grade D) to ≥60J (negotiable for critical applications) , critical for low-temperature and high-seismic zones.
Thermal Stability: Maintains ≥80% of its yield strength at 600℃ , suitable for high-temperature applications like chimney structures and furnace linings.
Technical Specifications
| Parameter | Value | Standard |
|---|---|---|
| Yield Strength | ≥295 MPa (≤16mm thickness) | GB/T 4171-2008 |
| Tensile Strength | 430-560 MPa | GB/T 4171-2008 |
| Corrosion Rate | ≤0.1 mm/year (5% NaCl, 1000h) | ASTM B117 |
| High-Temp Stability | ≥80% yield retention at 600℃ | Internal Testing |
| Bend Radius | ≥d=a (thickness ≤6mm) | GB/T 4171-2008 |
Fabrication & Sustainability
Formability: Easily shaped into complex geometries with bending radii as low as d=a for thicknesses ≤6mm , enabling creative architectural designs.
Welding: Requires pre-weld cleaning of 10-20mm around joints; uses Cu-bearing filler metals to maintain corrosion resistance in weld zones .
Eco-Friendly Design: Eliminates paint coatings, reducing VOC emissions by 90%. Fully recyclable, aligning with circular economy principles .
Standards & Compliance
Certifications: Compliant with GB/T 4171-2008, EN 10025-5, and optional ASTM A588 (equivalent to S355J2G1W) for international projects .
Quality Assurance: Each batch undergoes ultrasonic testing, chemical analysis, and salt spray verification to ensure uniformity.
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