Material Composition:
Base steel: High-strength low-alloy (HSLA) weathering steel
Key alloying elements: Cu (0.20-0.40%), Cr (0.40-0.65%), Ni (0.15-0.25%), P (0.07-0.15%)
Enhanced corrosion resistance with Si (0.30-0.50%) and Mn (0.75-1.25%)
Mechanical Properties:
Yield strength: ≥ 345 MPa (50 ksi)
Tensile strength: 485-620 MPa (70-90 ksi)
Elongation: ≥ 18% in 50mm
Charpy V-notch impact: 20J at -12°C (10ft-lb at 10°F)
Section Types & Sizes:
Square HSS: 25×25mm to 300×300mm (1"×1" to 12"×12")
Rectangular HSS: 50×25mm to 400×200mm (2"×1" to 16"×8")
Round HSS: Ø21.3mm to Ø508mm (Ø0.84" to Ø20")
Wall thickness: 1.6mm to 12.7mm (0.063" to 0.500")
Corrosion Performance:
Atmospheric corrosion resistance 4-8× carbon steel
Patina formation cycle: 6-24 months (environment dependent)
Suitable for C3-C5 corrosion categories per ISO 12944
Manufacturing Process:
Electric resistance welded (ERW) or seamless (SMLS)
Hot-rolled forming with controlled cooling
Mill-applied rust stabilization treatment available
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