Tianjin Brisk Steel is one of the manufacturers of Processing For Square & Rectangular Tube in China. Our products are mainly exported to the Middle East, Southeast Asia, Europe, New Zealand, and other regions.If you would like to learn more about our products, feel free to contact us and send your purchase list.
PRODUCT
Tianjin Brisk Steel focus on produce and supply hollow section and steel pipe
Standard & Product Definition
All our hollow sections are strictly manufactured according to AS/NZS 1163, the official Australian & New Zealand standard for cold-formed structural steel hollow sections.
Product Range:
- SHS – Square Hollow Section
- RHS – Rectangular Hollow Section
- CHS – Circular Hollow Section
Grade explanation for clients:
- C450: High strength grade for general structural usage
- C450L0: Most popular project grade, with 0℃ Charpy impact toughness, mandatory for outdoor, seismic, high wind-load Australian projects
Mechanical Properties
|
Property |
C450 / C450L0 Standard Value |
|---|---|
|
Yield Strength (fy) |
≥ 450 MPa |
|
Tensile Strength (fu) |
≥ 500 MPa |
|
Elongation |
10%–14% (depends on wall thickness ratio) |
|
Impact Toughness (L0 only) |
0℃ Charpy impact qualified |
Higher yield strength than standard C350, lighter structure weight, less steel consumption, lower project cost for long-span and heavy-load buildings.
Chemical Composition & Weldability
focus on welding performance because most hollow sections need on-site cutting, welding and assembly.
- Max Carbon Equivalent (CEV) ≤ 0.43: Low carbon & controlled alloy content ensures excellent weldability with all common welding methods (arc welding).
- Important tip for clients: C450 strength is formed by cold forming work-hardening. The welding heat-affected zone (HAZ) will have slight strength reduction, which is normal and fully compliant with AS 4100 structural design code.
Size Range & Tolerance
Client can provide size availability, tolerance accuracy and custom length to fit project drawings.
- SHS/RHS Size: 20×20mm ~ 1000×1200mm
- Wall Thickness: 1.6mm ~ 60mm
- Standard Length: 5.8m / 6m / 9m / 12m
- Custom Service: Cut-to-length, hole punching, end trimming available
- Tolerance: Strictly follow AS/NZS 1163 dimensional tolerance, no deformation, perfect for on-site assembly
Surface Finishes (Environment & Application Match)
Clients choose surface treatment according to local weather, usage environment and budget.
- - Black Mill Finish: Standard export finish, cost-effective, suitable for further painting/galvanizing
- - Hot-dip Galvanized: Australia standard anti-corrosion finish, for outdoor, coastal, high humidity projects
- - Anti-rust Oil: Basic protection for dry environment transportation
Application Scenarios (Help Clients Confirm Suitability)
We match products to clients' projects directly:
- Building structure: Factory columns, roof trusses, high-rise building frames
- Infrastructure: Pedestrian bridges, guardrails, large advertising frames, port supports
- Mechanical & industrial: Trailer chassis, agricultural machinery, heavy equipment brackets
- Logistics: Heavy-duty warehouse storage racks
- Best advantage: Perfect for Australia high wind speed & seismic zone projects due to high strength and stable toughness.
Standard Matching & Equivalent Grade
Many clients compare with their local standards:
- Equivalent to EU: EN 10219 S460MH / S460NH
- C450 vs C350: C350 for light-duty projects;C450 for heavy-load, long-span, high-standard Australian projects
FAQ
Q: Does C450 steel need pre-heating before welding?
A:For normal wall thickness below 12mm, pre-heating is not required. For thick sections over 12mm, low-level pre-heating is recommended to avoid welding cracks.
Q: Do you provide third-party inspection for C450 steel?
A: Yes. We support SGS, BV, TUV and any customer-appointed third-party inspection before shipment.
Q: Why is C450 more popular for Australian industrial buildings?
A: Australia has high wind load and strict structural codes. C450 provides higher strength-to-weight ratio, reducing total steel tonnage, saving freight and overall project cost while meeting AU structural safety requirements.
Q: What is the difference between C350 and C450 hollow section?
A: C450 has 100MPa higher yield strength than C350. C350 is for light structure, fencing, and general construction. C450 is for high wind, seismic, long-span, heavy-load Australian commercial & industrial structures, allowing lighter steel weight and smaller section size.
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