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About us
Tianjin lefin Industrial
TIANJIN LEFIN STEEL GROUP containing Tianjin lefin Industrial Co.,Ltd. 、Tianjin lefin steel import & export Co.,Ltd and Tianjin Shengqifeng International Trading Co., Ltd. -
Products
Steel Pipe Processing
Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard -
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Guarantee Quality
Our steel pipes are suitable for oil, natural gas, shipbuilding, chemical industry, water conservancy, electrical, steel structure, construction and other related fields.
Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard
Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard
Has rich experience in steel pipe processing, can be customized according to customer requirements according to the drawing and sample processing, assist in the development of new products.
fiji AS/NZS 1163 C350 Steel Pipes
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Product Description
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:
Standard Overview – AS/NZS 1163
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.
C350 Grade Specifications
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).
Common Applications
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.
Comparison With Other Grades
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.
Conclusion
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.
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Mob: +8615122229899(whatspp)
Phone: +86 22 58171905
Fax: +86 22 58171902
E-mail:info@lefinsteel.com
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