Moldova AS/NZS 1163 TUBE

AS/NZS 1163 TUBE  
AS 1163 is the Australian/New Zealand Standard for Cold-formed structural steel hollow sections, which specifies the requirements for the production and supply of these materials used for structural purposes. Here is a detailed introduction to the common steel grades under AS 1163, including their chemical composition, mechanical properties, tolerances, applications, and advantages

Basic Information  
AS/NZS 1163 TUBE  
Grades: C250, C250L0, C350, C350L0, C450, C450L0.  
Outside Diameter:  
20MM × 20MM - 1200MM × 1200MM(SHS)  
20MM × 30MM - 1000MM × 1500MM(RHS)  
Wall Thickness: 1.2MM - 50MM  
Wall thickness tolerance: ±10%  
Length: 1M - 12M, commonly used 5.8M,6M,12M, but we can also produces depends on client's requirement.  
Advantages: High strength and durability, Versatility, Aesthetics, Cost-effective, Environmentally friendly.  
Application: Construction, Transportation, Industrial.

Chemical Composition   

1 The following elements may be present to the limits stated: copper 0.25%,nickel 0.25%.  
2 Limits specified are for soluble or total aluminum.  
3 Applies to niobium and vanadium only. However, niobium greater than 0.010% is not permitted.  
4 Applies to niobium, vanadium and titanium only. However, vanadium greater than 0.10% is not permitted.

●Carbon (C): The carbon content increases from C250 to C450 grades, which corresponds to an increase in yield strength. Higher carbon content enhances strength but can reduce ductility and weldability if not controlled properly.  
●Silicon (Si): Silicon content is slightly higher in C350 and C450 grades compared to C250, contributing to better deformation resistance and tensile strength.  
●Manganese (Mn): Manganese is significantly higher in C350 and C450 grades, which improves the hardenability and strength of the steel.  
●Chromium (Cr) and Molybdenum (Mo): These elements are increased in the higher-strength grades (C350 and C450) to enhance hardness and strength, particularly at higher temperatures.  
●Micro-alloying elements: The presence of micro-alloying elements like niobium (Nb), vanadium (V), and titanium (Ti) in controlled amounts helps to refine the grain structure and improve the mechanical properties of the steel, especially in the higher-strength grades.  
The 'L0' suffix in C250L0, C350L0, and C450L0 indicates that these grades have been tested for impact properties at 0°C, making them suitable for applications in colder environments or where higher toughness is required.

CLICK HERE ➡ What Is Impact Test

Mechanical Properties 

d0 nominal outside diameter of a circular hollow section.  
b nominal length of side of a square hollow section, nominal length of the shorter side of a rectangular hollow section.  
d nominal length of the longer side of a rectangular hollow section.  
t  nominal thickness.

Yield Strength: The yield strength increases with the grade number, with C250 having the lowest and C450 having the highest minimum yield strength.  
Tensile Strength: Similar to yield strength, the tensile strength increases with the grade number, indicating the material's ability to withstand stretching before breaking.  
Elongation: This property measures the material's ductility.  
Applications And Advantages  
C250, C250L0

Applications:

●Construction: Used in light to medium structural applications where a minimum yield strength of 250 MPa is required. Suitable for non-critical load-bearing elements such as light frames, partitions, and support structures.  
●Industrial Equipment: Used in the manufacturing of frames for light machinery and equipment where moderate strength and durability are needed.  
Advantages:

●Cost-Effective: Provides a balance between strength and cost, making it suitable for applications where high strength is not critical.  
●Easy to Fabricate: The material is easy to cut, weld, and form, which simplifies the manufacturing and installation processes.  
●C250L0,Impact Resistance: Meets impact test requirements at 0°C, making it suitable for environments where low-temperature impact resistance is important.  
C350, C350L0

Applications:

●Construction: Ideal for use in areas where high winds or seismic activity are a concern. Its superior strength and durability make it suitable for critical structural components.  
●Industrial Structures: Used in industrial facilities where high strength and impact resistance are required.  
Advantages:

●High Strength: Provides a higher strength-to-weight ratio, making it ideal for applications where significant loads need to be supported.  
●Durability: Offers excellent durability and resistance to deformation, ensuring long-term structural integrity.  
●C350L0,Impact Resistance: Meets impact test requirements at 0°C, ensuring reliability in low-temperature conditions.

C450,C450L0

Applications:

●Heavy Structural Applications: Used in heavy-duty structural applications such as large bridges, high-rise buildings, and industrial plants where a minimum yield strength of 450 MPa is required.  
●Special Projects: Suitable for projects that require high strength and formability, such as complex structural designs and large-scale infrastructure projects.  
Advantages:

●High Strength and Formability: Combines high strength with good formability, allowing for the creation of complex shapes and structures.  
●Versatility: Can be used in a wide range of projects due to its high strength and ability to withstand significant loads.  
●C450L0,Impact Resistance: Meets impact test requirements at 0°C, ensuring reliability in low-temperature conditions.  
Production Process  
The production of AS 1163 cold-formed structural steel hollow sections .

Material Selection: High-quality steel strip is selected based on its chemical composition and mechanical properties to meet AS 1163 standards.  
Cold Forming: The steel strip is fed through roll forming machines to shape it into the desired hollow section profile (round, square, or rectangular).  
Welding: The edges of the formed strip are joined using electric resistance welding (ERW) to create a strong longitudinal weld.  
Heat Treatment: Some sections undergo post-weld heat treatment to relieve stresses and improve ductility.  
Quality Control:Dimensional accuracy and mechanical properties are verified through testing and inspection to ensure compliance with AS 1163 standards.  
Surface Treatment: Surface treatments like coating or galvanizing are applied to enhance corrosion resistance.  
Final Inspection and Packaging: The final product is inspected for defects and packaged for transport.  
 

These grades of AS 1163 hollow sections are widely used in various industries due to their specific mechanical properties and versatility, making them suitable for a wide range of structural and mechanical applications.

And  the choice between AS 1163 C250, C250L0, C350, C350L0, C450, and C450L0, should be guided by the specific demands and stress conditions of the engineering project. As the yield strength increases, the elongation rate decreases, indicating that the strength of the steel increases but its plastic deformation capacity decreases.