Hollow Section-Rectangle Tubes

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Loading Port:: Tianjin

Payment Terms:: TT or L/C

Min Order Qty:: 50MT m.t.

Supply Capability:: based on order m.t./month

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Application

It is widely used in building, machine, chemical equipment, automobile industrial, container, it is also applied to agriculture and mine machine.

Standard：

ASTM A500, GB6728

Steel grade:

ASTM A500: A, B, C

GB6728：Q195，Q215，Q235，Q345

Size of Pipe:

*Remark: Besides below sizes, we also can arrange production based on requirement of customers

Sizee(mm)	Thickness(mm)
20×10	0.6-1.0
25×12	0.6-1.0
38×19	0.6-1.5
50×25	0.6-1.5
50×30	1.6-3.0
60×40	1.5-3.5
75×50	1.5-4.0
80×40	1.5-4.0
100×50	2.0-6.0
100×60	2.0-6.0
100×75	2.0-6.0
120×60	3.0-6.0
120×80	3.0-6.0
125×50	3.0-6.0
125×75	3.0-6.0
150×50	3.0-6.0
150×75	3.0-6.0
150×100	4.0-12
160×80	4.0-6.0
175×100	4.0-12
200×100	4.0-12
200×150	4.0-12
250×150	5.0-12
300×200	5.0-12
400×200	5.0-12

Standard: ASTM A500

Chemical Composition(%)

Chemical Requirement
	Composition %
	Grade A		Grade B
	Heat	Product	Heat	Product
Element	analysis	analysis	analysis	analysis
Carbon max	0.26	0.3	0.22	0.26
Manganese max	…	…	1.4	1.45
Phosphorus, max	0.035	0.045	0.03	0.04
Sulfur max	0.035	0.045	0.02	0.03
Where an ellipsis (...)appears in this table, there is no requirement
For each reduction of 0.01 percentage point below the specified maximum for carton, and increase of 0.06 percentage point above the specified maximum for manganese is permitted, up to a maximum of 1.50% by heat analysis and 1.6% by product analysis

Mechanical Properties

Tensile Requirement
	Grade A	Grade B
Tensile strength, min, psi (Mpa)	48000 (400)	70000 (483)
Yield strength, min, psi (Mpa)	36000 (250)	50000 (345)
Elongation in 2 in. (50.8mm), min, %	23	23

GB6728：

Steel Grade

CHEMICAL COMPOSITION

MECHANICAL PROPERTIES

C (%)

Si (%)

(%)

P(%)

Max

S (%)

Max

YS(Mpa)

Min

TS(Mpa)

Min

El (%)

Min

Q195

0.06-0.012

0.3

0.25-0.5

0.45

0.5

195

315

Q215

0.09-0.15

0.3

0.25-0.55

0.45

0.5

215

335

Q235

0.12-0.22

0.3

0.3-0.7

0.45

235

375

Q345

0.20

0.55

1.0-1.6

0.45

345

510

producing of Hollow Section-Rectangle Tubes

Chinese Hollow Section-Rectangle Tubes/Hiquality Hollow Section-Rectangle Tubes

delivery of Hollow Section-Rectangle Tubes

manufacturer of Section-Rectangle Tubes

Q:Are metal spiral tubes the same as metal bellows?: The spiral tube called spiral steel tube or spiral welded pipe, the low carbon steel or low alloy structural steel strips in a helical line certain angle (called forming angle) rolled into a tube, then the tube welding seam made up, it can be used in narrow strip production of large diameter steel pipe. The pitch of a spiral pipe is much larger than that of a bellows.

Q:What's the difference between hot dip galvanizing and cold galvanizing? Which kind of galvanizing method is good?: Cold galvanizing is zinc plating, the general surface is relatively smooth, no zinc flowers, there are two kinds of resistance to fingerprints and non - Fingerprint

Q:DN150 welded steel tubes one meter multiple: DN150 welded steel pipe according to the thickness of two specifications: outer diameter 165mm, wall thickness 4.5mm, 17.81Kg per meter weight, wall thickness of 5.5mm, 21.63Kg. per meter weight

Q:How do you calculate the deflection of a steel pipe?: To calculate the deflection of a steel pipe, you need to consider various factors such as the material properties, applied loads, and geometrical characteristics. The following steps can guide you through the process: 1. Determine the material properties: Obtain the necessary information about the steel pipe, such as its Young's modulus (E), which represents its stiffness or resistance to deformation. This value is typically provided by the manufacturer or can be found in material databases. 2. Analyze the applied loads: Identify the types and magnitudes of the loads acting on the steel pipe. These loads can include point loads, distributed loads, or a combination of both. Determine the location and orientation of the applied loads as well. 3. Evaluate the pipe's geometry: Measure or obtain the dimensions of the steel pipe, including its length (L), outer diameter (D), and wall thickness (t). Ensure that these values are accurate to achieve a precise calculation. 4. Select an appropriate calculation method: Depending on the complexity of the loading and support conditions, you may need to use either simple beam theory or more advanced structural analysis methods, such as the finite element method (FEM). 5. Apply the appropriate equations: For simple beam theory, you can use the Euler-Bernoulli beam equation to calculate the deflection at a specific point on the pipe. This equation is based on assumptions that the pipe is homogeneous, linearly elastic, and subjected to small deflections. For more complex scenarios, FEM software can handle the calculations. 6. Determine the boundary conditions: Identify the support conditions at both ends of the pipe, which can include fixed supports, simply supported ends, or combinations of both. These conditions significantly affect the pipe's deflection. 7. Calculate the deflection: Using the equations relevant to your chosen method and incorporating the material properties, applied loads, and geometry, you can calculate the deflection at specific points along the steel pipe. The deflection can be measured in terms of vertical displacement or angular rotation. It is important to note that calculating the deflection of a steel pipe may require specialized engineering knowledge and software tools. If you lack experience in structural analysis, it is advisable to consult a professional engineer to ensure accurate results and safe design.

Q:What's the difference between hot-rolled seamless steel tube and cold-rolled seamless steel tube?: The difference between hot rolled seamless steel tube and cold rolled seamless steel tube:1) cold-rolled seamless tubes tend to be of small diameter, and hot-rolled seamless tubes are often of large diameter.2) the accuracy of cold-rolled seamless steel tube is higher than that of hot-rolled seamless steel tube, and the price is higher than that of hot-rolled seamless steel tube.

Q:What are the quality control measures for steel pipe production?: Quality control measures for steel pipe production typically involve several steps to ensure the final product meets the required specifications and industry standards. These measures may include inspection of raw materials, such as the steel coils or plates, to ensure they meet the required chemical composition and mechanical properties. During manufacturing, various processes like forming, welding, and heat treatment are closely monitored to maintain dimensional accuracy and integrity. Non-destructive testing methods, such as ultrasonic or radiographic inspection, are often employed to detect any defects or anomalies in the pipes. Additionally, visual inspection, surface treatment assessment, and mechanical testing are conducted to assess the overall quality before the pipes are released for distribution.

Q:How are steel pipes recycled?: Steel pipes are recycled through a multi-step process that involves collection, sorting, cleaning, and melting. First, the used steel pipes are gathered from various sources such as construction sites or industrial facilities. Then, they are sorted based on their size, shape, and quality. Next, any contaminants or coatings are removed from the pipes through cleaning and stripping processes. Finally, the cleaned pipes are melted down in a furnace, and the molten steel is formed into new pipes or other steel products. This recycling process reduces the demand for new raw materials and helps conserve energy and resources.

Q:How are steel pipes used in the manufacturing of machinery and equipment?: Steel pipes are widely used in the manufacturing of machinery and equipment due to their numerous beneficial properties. These pipes are primarily used for conveying various materials, fluids, and gases within the machinery, providing a safe and efficient means of transportation. One of the key uses of steel pipes in machinery manufacturing is in the process of hydraulic and pneumatic systems. Hydraulic systems rely on steel pipes to transmit power and control fluid flow, while pneumatic systems use these pipes to convey compressed air to power various components. The strength and durability of steel pipes ensure that they can withstand the high pressure and forces exerted by these systems, making them a reliable choice for such applications. Additionally, steel pipes are used in the construction of machinery frames and structures. Their high tensile strength and resistance to corrosion make them ideal for providing structural support and stability to heavy machinery. These pipes can be easily welded, bent, and fabricated into various shapes, allowing for flexibility in design and enabling the creation of complex machinery structures. Furthermore, steel pipes play a vital role in the transportation of raw materials and finished products within the manufacturing process. They are commonly used as conduits for the movement of liquids, gases, and granular materials, facilitating the smooth operation of machinery and equipment. Steel pipes are particularly suitable for handling abrasive and corrosive materials, as their robust construction ensures minimal wear and tear over time. In summary, steel pipes are extensively used in the manufacturing of machinery and equipment due to their strength, durability, and versatility. Whether it is for hydraulic systems, structural support, or material transportation, steel pipes are an integral component that contributes to the efficiency and reliability of machinery in various industries.

Q:What are the different methods of coating steel pipes?: There are several different methods of coating steel pipes, including fusion bonded epoxy (FBE) coating, liquid epoxy coating, polyurethane coating, and three-layer polyethylene (3LPE) coating.

Q:What are the different types of steel pipe supports for high-temperature applications?: Some different types of steel pipe supports for high-temperature applications include hangers, clamps, brackets, and anchors. These supports are designed to withstand the elevated temperatures and provide stability and proper alignment to the piping system.

We mainly produces Square and Rectangular Tubes which using the cold rolling technology and other types of tube including Round Steel Pipes, Welded Steel Pipes, Seamless Steel Pipes, Long Products, Flat Steel Products and so on. Our productivity achieves 500, 000 tons each year. Our company is stronger in financial capital and enough power of technical support. The steel tubes made by the company are strictly according to ISO9001:2000 standard quality management system to ensure the high quality of the products.

1. Manufacturer Overview
Location	Tianjin,China
Year Established	2000
Annual Output Value	Above Thirty Million RMB
Main Markets	China; Europe
Company Certifications	ISO9001:2000

2. Manufacturer Certificates
a) Certification Name
Range
Reference
Validity Period

3. Manufacturer Capability
a)Trade Capacity
Nearest Port	Tianjin；Qingdao
Export Percentage	41% - 50%
No.of Employees in Trade Department
Language Spoken:	English；Chinese
b)Factory Information
Factory Size:	53000square meter
No. of Production Lines
Contract Manufacturing	OEM Service Offered；Design Service Offered
Product Price Range	Low Average