AS/NZS 1163 C350 Steel Pipes

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AS/NZS 1163 C350 is an Australian/New Zealand Standard for cold-formed structural steel hollow sections, commonly used in construction and engineering applications. Below is a detailed description of this standard and the C350 grade:

Title: Cold-formed structural steel hollow sections

Scope: Specifies requirements for circular, rectangular, and square hollow sections (CHS, RHS, SHS) manufactured by cold-forming and welding.

Applications: Used in structural frameworks, buildings, bridges, machinery, and other load-bearing components.

Material: Carbon steel with specified mechanical properties.

The "C350" designation refers to the minimum yield strength (350 MPa) of the steel.

Key Properties:

• Yield Strength (min): 350 MPa (hence "C350")
• Tensile Strength: Typically 430 MPa (varies based on thickness and processing)
• Elongation: Minimum 16% ( CHS, d₀/t≤15); Minimum 12% ( RHS, d/t≤15)

Chemical Composition:

• Carbon (C): ≤ 0.20%
• Silicon (Si)：≤ 0.45%
• Manganese (Mn): ≤ 1.60%
• Phosphorus (P), Sulfur (S): Low (≤ 0.030% each)
• May include micro-alloying elements (e.g., Nb, V, Ti) for strength.

Manufacturing Process:

• Cold-forming: Steel sheets are roll-formed and welded into hollow sections at ambient temperature.
• Welding: High-frequency electric resistance welding (HFW) is typically used.
• Surface Finish: Usually galvanized or painted for corrosion resistance (if specified).

Dimensional Tolerances (AS/NZS 1163):

• Outer dimensions (width, depth, diameter): ±1% or ±0.5 mm (whichever is greater).
• Wall thickness: Varies by section type (e.g., ±10% for SHS and RHS).

AS/NZS 1163 C350 is widely used in various construction and engineering applications due to its high strength and versatility. Common applications include:

• Structural Frames: For commercial buildings, warehouses, and bridge supports.
• Mechanical Engineering: In the manufacturing of machinery and equipment.
• Handrails, Furniture, and Display Stands: Due to its aesthetic appeal and structural integrity.

C250: C350 offers higher strength (350 MPa vs. 250 MPa yield strength) and greater load-bearing capacity.

C450: While C450 provides even higher strength (450 MPa yield strength), C350 offers better ductility and is often more cost-effective.

AS/NZS 3678 (Hot-rolled): Similar grades (e.g., 350W) but different forming process.

AS/NZS 1163 C350 is a high-strength cold-formed hollow section steel widely used in construction and engineering due to its balance of strength, weldability, and formability. It meets stringent Australian/New Zealand standards for structural integrity.