Rectangular Hollow Sections (RHS), Grade 350, various sizes (Specified by size & wall thickness)
Cold-formed structural steel hollow sections to AS/NZS 1163 with 350 MPa minimum yield strength, providing excellent strength-to-weight ratio for structural applications in Australian construction
Cold-formed structural steel hollow sections to AS/NZS 1163 with 350 MPa minimum yield strength, providing excellent strength-to-weight ratio for structural applications in Australian construction
RHS Grade 350 are cold-formed, electric resistance-welded steel hollow sections manufactured to AS/NZS 1163:2016. The '350' designation indicates a minimum yield strength of 350 MPa, making these sections suitable for high-strength structural applications. The rectangular profile offers excellent torsional rigidity and compression resistance, with standard sizes ranging from 50x20mm to 400x300mm with wall thicknesses from 1.6mm to 16mm. The material features a ferrite-pearlite microstructure providing optimal strength and ductility for welding and fabrication.
- High strength-to-weight ratio optimising structural efficiency
- Excellent torsional rigidity and buckling resistance
- Suitable for welding with standard procedures
- Consistent mechanical properties through cold-forming process
- 100% recyclable with established recycling infrastructure
- Available in dual-grade options (C350/C450) for design flexibility
- Compatible with all standard connection methods
- Aesthetic appeal for architectural exposed applications
- Lower embodied carbon than concrete alternatives
- 01 High strength-to-weight ratio optimising structural efficiency
- 02 Excellent torsional rigidity and buckling resistance
- 03 Suitable for welding with standard procedures
- 04 Consistent mechanical properties through cold-forming process
- 05 100% recyclable with established recycling infrastructure
- 01 Requires fire protection for rated assemblies
- 02 Susceptible to corrosion without protective coatings
- 03 Thermal bridging in building envelope applications
- 04 Higher initial cost than timber alternatives
- 05 Limited availability of very large sections
- Density
- 7850 kg/m³
- Specific gravity
- 7.85
- Porosity
- 0 %
- Water absorption
- 0 %
- Hardness
- 150
- UV resistance
- High // Inorganic material unaffected by UV
- Chemical resistance
- Moderate // Requires protection in aggressive environments
- pH tolerance
- 4-10
- Surface roughness
- 3.2 µm
- Tensile strength
- 430 MPa
- Compressive strength
- 350 MPa
- Flexural strength
- 350 MPa
- Shear strength
- 200 MPa
- Poisson's ratio
- 0.3
- Impact resistance
- 27
- Creep resistance
- Negligible below 400°C // Temperature dependent
- Embodied carbon
- 14.5
- Carbon footprint
- 1.85
- Embodied energy
- 25 MJ/kg
- Water footprint
- 28 L/kg
- Recycled content
- 25 %
- Renewable content
- 0 %
- Circular score
- 85
- Combustibility class
- Non-combustible // AS 1530.1
- Fire resistance level
- 0/-/- unprotected; up to 240/-/- with intumescent coating // AS 1530.4
- Flame spread index
- 0
- Smoke dev. index
- 0
- Heat release rate
- 0
- Material cost (range)
- 1800-2500 // AUD/tonne - 2024 market prices
- Material cost (per unit)
- 15-45 // AUD/m depending on size
- Lead time
- 1-3 days ex-stock, 2-4 weeks fabricated // Typical
- Lifecycle cost
- Competitive over 50+ year design life // Qualitative
- Annual maintenance
- 2-5 // AUD/m² for coating maintenance
- Market availability
- Readily available // Stock items
- Expected lifespan
- 50-100 // years with appropriate protection
- Maintenance interval
- 5-10 // years for coating inspection
- Warranty period
- 10-25 // years for galvanised coatings