Form · Sizes pending
Metallic — indicative fig. M·80
Fire A1 Non-combustibleEmbodied carbon 2.10kgCO₂e/kg Medium–highCompressive 350MPa StructuralDesign life 50yr
Cold-formed structural steel hollow sections with 350 MPa minimum yield strength, compliant with AS/NZS 1163:2016, offering excellent strength-to-weight ratio and torsional rigidity for structural applications
01 Physical
Density 7850kg/m³
Specific gravity 7.85
Porosity 0%
Water absorption 0%
Hardness 170
UV resistance moderate
Chemical resistance moderate
pH tolerance 4-10
Surface roughness 3.2µm
02 Mechanical
Tensile strength 430MPa
Compressive strength 350MPa
Flexural strength 350MPa
Shear strength 200MPa
Poisson's ratio 0.3
Impact resistance 27
Creep resistance excellent
03 Thermal
Thermal conductivity 50W/m·K
Specific heat 450J/kg·K
Thermal expansion 12×10⁻⁶/°C
04 Compliance & Fire First question
Combustibility class non-combustible
Fire resistance level 0-240 minutes
Flame spread index 0
Smoke dev. index 0
Heat release rate 0
05 Sustainability & Health
Embodied carbon 2100kgCO2e/tonne
Carbon footprint 2.1
Embodied energy 25MJ/kg
Water footprint 45L/kg
Recyclability 100%
Recycled content 25%
Renewable content 0%
Circular score 85
VOC emissions 0
Toxicity rating non-toxic
LEED contribution 2
06 Durability · Cost · Logistics
Expected lifespan 50-100 years
Maintenance interval 5-10 years
Warranty period 10-25 years
Material cost (range) $1200-$1800
Material cost (per unit) $1500/tonne
Lead time 2-6 weeks
Lifecycle cost $3500-5000/tonne
Annual maintenance $5-15/m²
Market availability high
07 Assessment
Advantages
- High strength-to-weight ratio optimising material efficiency
- Excellent torsional rigidity and buckling resistance
- Uniform external dimensions simplifying connections
- Superior aesthetic appeal for exposed applications
- Readily available across Australian markets
- Compatible with standard Australian fabrication practices
- Suitable for all climate zones including cyclonic regions
- Excellent weldability with proper procedures
- Can be hot-dip galvanised for corrosion protection
- Recyclable with established recycling infrastructure
Constraints
- Susceptible to corrosion without protective coating
- Requires fireproofing for fire-rated applications
- Internal surfaces difficult to inspect and maintain
- Connection details more complex than open sections
- Higher cost per tonne than open sections
- Limited availability in remote regions
- Potential for internal condensation in some applications
- Requires skilled welders certified to AS/NZS 1554
- Size limitations for very large structural members
- Cold-formed corners may affect local stress distribution
08 Applications
A1 Structural columns in multi-storey buildings
A2 Roof trusses and portal frames
A3 Bridge components and pedestrian walkways
A4 Industrial equipment frames and supports
A5 Architectural features and exposed steelwork
A6 Temporary structures and scaffolding systems
A7 Mining and resource sector infrastructure
A8 Agricultural buildings and storage facilities
A9 Stadium and arena structures
A10 Transmission towers and communication masts
09 Sources & Standards
Sources pending — citations for this material are not yet recorded. Verify all figures against manufacturer data and current standards before specifying.