Welcome to ALLLAND Steel Pipe Co., Ltd.
Welcome to ALLLAND Steel Pipe Co., Ltd.
ALLLAND Steel Pipe Supply
Welcome to ALLLAND Steel Pipe Manufacturing.
AS/NZS 1163 C350 Steel Hollow Section is a high-strength, cold-formed structural steel hollow section under the Australian/New Zealand standard system. It has a minimum yield strength of ≥350 MPa and is widely used in building structures, bridges, industrial facilities, and foundation engineering. This grade is available in various section forms, including CHS, SHS, and RHS, combining high strength, good weldability, and high structural efficiency, making it suitable for medium and heavy-duty steel structure projects.ALLLAND Steel Pipe manufactures and supplies C350 structural steel hollow sections according to the AS/NZS 1163 standard, offering various specifications, wall thicknesses, and lengths to meet the application needs of international engineering projects for structural steel pipes.
Alllandsteel is a steel pipe manufacturer based in China with 25 years of experience.
The facility spans 22,000 square meters, represents a RMB 700 million investment, and operates four production lines (JCOE, ERW, SMLS, SSAW) alongside five coating lines.
With an annual production capacity of 250,000 tons, the factory covers specifications ranging from Ø406 to Ø1524 and holds multiple international certifications (API/ASTM/EN/ISO/JIS). Focused on steel pipes, creating value for you!
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AS/NZS 1163 C350 Steel Hollow Section is a grade of high-strength cold-formed structural steel hollow section under the Australian/New Zealand standard system. It is primarily used in building structures, high-rise steel structures, bridge engineering, industrial plants, heavy machinery supports, and other structural applications requiring higher load-bearing capacity.
This standard specifies the technical requirements for structural round tubes (CHS), square tubes (SHS), and rectangular tubes (RHS) manufactured using cold forming and resistance welding (ERW).
W.T.:
2.0 mm – 16 mm
Length:
6-12 m, available in fixed or multiple lengths; custom lengths per project requirements.
Manufacturing Process:
Cold Formed + ERW Welding
Standard:
AS/NZS 1163
Steel Grades:
C350 / C350L0
Tube Ends& Surface Treatment:
Square, Chamfered; Black Skin, Pickled, Painted/Oiled for Rust Prevention
Steel Type:
Structural Hollow Section
The C350 grade provides higher structural strength compared with C250, making it suitable for medium and heavy-load applications.
C350 CHS（Circular Hollow Section）
CHS is a round structural tube mainly used for compression members, columns, and tubular structures.
| Parameter | Range |
| Outside Diameter | 21.3–508 mm |
| Wall Thickness | 2.0–16 mm |
| Length | 6 m / 12 m |
C350 SHS（Square Hollow Section）
SHS provides equal strength in both directions and is widely used in architectural and structural applications.
| Parameter | Range |
| Size Range | 20×20–400×400 mm |
| Wall Thickness | 2–16 mm |
| Length | 6 m / 12 m |
Applications:
C350 RHS（Rectangular Hollow Section）
RHS provides excellent bending resistance and is commonly used as beams and structural members.
| Parameter | Range |
| Size Range | 40×20–500×300 mm |
| Wall Thickness | 2–16 mm |
| Length | 6 m / 12 m |
AS/NZS 1163 C350 Steel Hollow Sections are available in CHS, SHS and RHS configurations. The available dimensions include different outside diameters, section sizes, wall thicknesses and lengths according to project requirements.
For the complete AS/NZS 1163 hollow section size range, please visit our detailed AS/NZS 1163 Steel Hollow Section Dimensions page.
AS/NZS 1163 C350 CHS Dimensions (Typical Sizes)
| Outside Diameter (mm) | Wall Thickness (mm) | Weight (kg/m) |
| 48.3 | 3.2 | 3.56 |
| 60.3 | 3.6 | 4.95 |
| 88.9 | 4.0 | 8.23 |
| 114.3 | 4.5 | 12.30 |
| 139.7 | 5.0 | 16.38 |
| 219.1 | 8.0 | 40.89 |
| 273.0 | 10.0 | 63.67 |
AS/NZS 1163 C350 SHS Dimensions (Typical Sizes)
| Size (mm) | Wall Thickness |
| 50×50 | 3.0 mm |
| 75×75 | 4.0 mm |
| 100×100 | 5.0 mm |
| 150×150 | 6.0 mm |
| 200×200 | 8.0 mm |
AS/NZS 1163 C350 RHS Dimensions (Typical Sizes)
| Size (mm) | Wall Thickness |
| 100×50 | 4.0 mm |
| 150×75 | 5.0 mm |
| 200×100 | 6.0 mm |
| 250×150 | 8.0 mm |
| 300×200 | 10.0 mm |
| Test | Requirement |
| Test Temperature | 0℃ |
| Test Method | Charpy V-notch |
| Average Absorbed Energy | ≥27 J |
| Individual Value | ≥20 J |
The mechanical properties of AS/NZS 1163 C350 provide the required strength and durability for structural applications.
| Property | Requirement |
| Yield Strength (Fy) | ≥350 MPa |
| Tensile Strength (Fu) | ≥430 MPa |
| Elastic Modulus | 200 GPa |
| Density | 7850 kg/m³ |
| Poisson’s Ratio | 0.25–0.30 |
| Thermal Expansion Coefficient | 11.7 ×10⁻⁶ /℃ |
For applications requiring improved low-temperature toughness, AS/NZS 1163 also provides the C350L0 grade.
C350L0 means:
Typical applications include:
Depending on the cross-sectional ratio d/t (CHS) or b/t, d/t (RHS/SHS), the elongation requirements are as follows:
| Grade | Section | Ratio | Minimum Elongation |
| C350 | CHS | d/t ≤15 | ≥16% |
| C350 | CHS | 15＜d/t≤30 | ≥18% |
| C350 | CHS | d/t＞30 | ≥20% |
| C350 | RHS/SHS | ≤15 | ≥12% |
| C350 | RHS/SHS | 15＜b/t≤30 | ≥14% |
| C350 | RHS/SHS | ＞30 | ≥16% |
| Property | Value |
| Density | 7850 kg/m³ |
| Young’s Modulus | 200,000 MPa |
| Shear Modulus | 80,000 MPa |
| Poisson’s Ratio | 0.25 |
| Thermal Expansion | 11.7×10⁻⁶ /℃ |
AS/NZS 1163 C350 is generally produced from low-carbon micro-alloyed steel to achieve high strength while maintaining good weldability.
| Element | Typical Requirement |
| Carbon (C) | ≤0.20% |
| Silicon (Si) | ≤0.50% |
| Manganese (Mn) | ≤1.70% |
| Phosphorus (P) | ≤0.035% |
| Sulfur (S) | ≤0.035% |
| Carbon Equivalent (CE) | Controlled |
The controlled chemical composition provides:
In commercial buildings, industrial workshops, and warehouse structures, hollow sections are often selected because they provide efficient load distribution and good structural stability.
AS/NZS 1163 C350 is commonly used for:
| Application | Suitable Section |
| Structural columns | SHS / CHS |
| Roof trusses | CHS |
| Frame beams | RHS |
| Bracing members | SHS / CHS |
Compared with lower-strength grades such as C250, C350 can provide higher load capacity while maintaining relatively efficient section dimensions, which is beneficial for projects requiring weight optimization.
ALLLAND supplies AS/NZS 1163 C350 CHS, SHS, and RHS hollow sections for structural fabrication projects, with options for different sizes, wall thicknesses, and lengths according to project requirements.
Why choose the C350?
AS/NZS 1163 C350 vs C250
| Item | C250 | C350 |
|---|---|---|
| Yield Strength | ≥250 MPa | ≥350 MPa |
| Load-Bearing Capacity | Standard | Higher |
| Suitable Structures | General Construction | Medium and Large-Scale Structures |
| Steel Consumption | Higher | Lower |
C350 can help design engineers reduce cross-sectional dimensions while meeting strength requirements.
Steel hollow sections are widely used in bridge structures due to their high strength-to-weight ratio and good resistance to compression and bending forces.
Typical applications of AS/NZS 1163 C350 include:
For applications exposed to low temperatures, the C350L0 grade is available with Charpy V-notch impact requirements at 0°C, providing improved resistance against brittle fracture.
ALLLAND can supply structural hollow sections with mechanical testing and inspection documentation required for infrastructure projects.
Mining and industrial facilities require structural materials capable of supporting heavy equipment, continuous operation loads, and outdoor environmental conditions.
AS/NZS 1163 C350 hollow sections are commonly used in:
| Application | Section Type |
| Equipment support frames | RHS / SHS |
| Conveyor structures | RHS |
| Pipe racks | CHS / RHS |
| Maintenance platforms | SHS / RHS |
The combination of strength and weldability makes C350 suitable for fabricated steel structures where durability and structural performance are important.
AS/NZS 1163 C350 is a cold-formed structural steel hollow section grade with a minimum yield strength of 350 MPa.
The main difference is strength. C350 has a minimum yield strength of 350 MPa, while C250 has 250 MPa.
AS/NZS 1163 C350 Steel Hollow Section is widely used in structural engineering applications where higher strength and reliable performance are required.
Common industries include:
C350 is commonly selected for medium and heavy-duty structures due to its minimum yield strength of 350 MPa.
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