Properties:
Standard: Chinese National Standard GB/T 4171 (Weathering Structural Steel)
Yield Strength (ReH): ≥235 MPa
Tensile Strength (Rm): 360-510 MPa
Elongation (A%): ≥24%
Impact Toughness: ≥27J (-20°C, Charpy V-notch)
Corrosion Resistance: Forms a protective rust layer (2-8x better than carbon steel in atmospheres)
Key Features:
"NH" = Nài Hòu (耐候, "weather-resistant")
Contains alloying elements (Cu, Cr, Ni) for atmospheric corrosion resistance
Weldable (preheat if thickness >25mm)
Applications:
Outdoor structures: Bridges, railway vehicles, containers
Architecture: Facades, sculptures, exposed steel frameworks
Transportation: Shipping containers, truck frames
