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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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Service Capability
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.
Maldives AS 1163 TUBE
Product Description
Brief Introduction
AS1163 HOLLOW SECTION
Standard: AS 1163
Grade: C250, C250L0, C350, C350L0, C450, C450L0
Outside diameter: 20-660mm Wall Thickness: 1.3-16mm
Outside diameter: 20*20-1200*1200mm Wall Thickness: 1.3-50mm
Outside diameter: 20*30-1500*1200mm Wall Thickness: 1.2-50mm
The Wall Thickness Tolerance: ±5%
Length: normally 5.8m, 6m, 12m or as your required
Surface Treatment: Bare Finish, Painting, Oiling, Galvanzation, 3PE, FBE coated......
Chemical Composition
Grade | Chemiacal Composition | ||||||||
C | Si | Mn | P | S | Cr | Mo | Al | Ti | |
C250 | 0.12 | 0.05 | 0.50 | 0.03 | 0.03 | 0.15 | 0.10 | 0.10 | 0.04 |
C350 | 0.20 | 0.45 | 1.60 | 0.03 | 0.03 | 0.30 | 0.10 | 0.10 | 0.04 |
C450 | 0.20 | 0.45 | 1.70 | 0.03 | 0.03 | 0.50 | 0.35 | 0.10 | 0.04 |
Physical requirements
Grade | Minimum yield strength(MPa) | Minimum tensile strength(MPa) | Minimum Elongation(%) | |||||
Circular hollow section | Rectangular hollow section | |||||||
≤15 | ＞15≤30 | ＞30 | ≤15 | ＞15≤30 | ＞30 | |||
C250 | 250 | 320 | 18 | 20 | 22 | 14 | 16 | 18 |
C350 | 350 | 430 | 16 | 18 | 20 | 12 | 14 | 16 |
C450 | 450 | 500 | 12 | 14 | 16 | 10 | 12 | 14 |
Production Process
High-quality steel strips or coils are chosen based on the required chemical composition and mechanical properties. These raw materials should meet the standard's requirements for elements such as carbon, manganese, chromium, molybdenum, and aluminum.
The steel strips or coils are cold-formed into the desired hollow section shapes (circular, square, or rectangular) through roll forming machines. This process gives the tubes their initial shape while maintaining the material's strength and ductility.
Electric resistance welding (ERW) is commonly used to join the edges of the formed steel strips. This welding method ensures a strong and high-quality weld seam without the need for additional filler materials. The welded tubes are then passed through a series of shaping rolls to achieve the final shape and size .
Various tests and inspections are carried out to ensure that the tubes meet the AS1163 standard requirements. These include dimensional checks, surface quality inspection, mechanical property tests (such as tensile test, impact test, and flattening test), and non-destructive testing (like ultrasonic testing or radiographic testing) for the weld seam .
Applications
Construction
They are commonly used as structural components in buildings, such as columns, beams, and support systems. The high strength-to-weight ratio of AS1163 tubes allows for the construction of tall and large-span structures while reducing the overall weight of the building. For example, in the construction of high-rise buildings, these tubes can effectively resist lateral loads and minimize deflection. A notable case is the Sydney Opera House, where AS1163 tubes were used in the structural framework system to build complex curved shapes while ensuring the required strength and stability to support the concrete shell and other loads .
Infrastructure projects
AS1163 tubes are essential for the construction of bridges, overpasses, and pedestrian walkways. They are used to build trusses, beams, and support structures that ensure the safe and stable transmission of loads over large spans. The Sydney Harbour Bridge is a typical example, with its main arch span supported by two huge steel arches composed of a series of interconnected AS1163 tubes. These tubes have withstood the test of time since the bridge was completed in 1932.
Industrial facilities
In the industrial field, AS1163 tubes are used for various structures such as support frames, platforms, and equipment frames. They have the strength and rigidity required to withstand heavy loads and harsh environmental conditions often encountered in industrial settings. For instance, in the construction of offshore oil and gas platforms, AS1163 tubes are used to build the platform's structural framework, providing the strength and durability needed to withstand extreme environmental conditions like strong winds, waves, and corrosive saltwater, while also supporting the weight of the platform's equipment and personnel .
Architectural design
Besides their structural functions, AS1163 tubes are also used in architectural elements to enhance the aesthetics of buildings and structures. They can be used to construct exterior walls, canopies, and decorative structures, providing design flexibility and an industrial-chic aesthetic. The bending, curving, and welding capabilities of AS1163 tubes allow architects and designers to create unique and eye-catching architectural features.
An example is Melbourne's Federation Square, which features a striking deconstructivist style design with dynamic shapes and forms. AS1163 tubes were extensively used in the construction of canopies, facades, and structural elements, enabling the architects to achieve their bold and unconventional vision while maintaining the necessary structural integrity .
Address: Hengtai Road,Daqiuzhuang Town,Jinghai County,Tianjin,China
Mob: +8615122229899(whatspp)
Phone: +86 22 58171905
Fax: +86 22 58171902
E-mail:info@lefinsteel.com
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