Hollow Section-Square 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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Hollow Section-Square Tubes

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

SIZE(mm)	THICKNESS(mm)
10×10	0.6-1.0
12×12	0.6-1.0
16×16	0.6-1.2
19×19	0.6-1.5
20×20	1.6-1.5
25×25	1.0-2.75
30×30	1.0-2.75
32×32	1.0-3.0
38×38	1.0-3.0
40×40	1.0-3.5
50×50	1.0-5.0
60×60	1.0-6.0
63.5×63.5	1.0-6.0
70×70	1.5-6.0
75×75	1.5-6.0
80×80	2.0-6.0
90×90	2.0-6.0
100×100	2.3-6.0
120×120	4.0-6.0
125×125	4.0-6.0
150×150	4.0-8.0
200×200	6.0-12
250×250	6.0-12
300×300	6.0-12
400×400	6.0-12

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-Square Tubes

Square Welded Hollo Sectio/Welded Rectangle Hollow Section

delivery of Hollow Section-Square Tubes

Q:Can steel pipes be used for underground gas distribution?: Yes, steel pipes can be used for underground gas distribution. Steel pipes are commonly used for gas distribution as they are strong, durable, and can withstand high pressure. Additionally, steel pipes have excellent resistance to corrosion, which is crucial for underground installations. However, it is important to ensure proper coating and insulation to prevent any potential damage or leakage.

Q:How are steel pipes used in nuclear power plants?: Steel pipes are used in nuclear power plants for various purposes, including transporting coolant, steam, and other fluids, as well as providing structural support for the plant's infrastructure.

Q:Are steel pipes suitable for potable water supply?: Yes, steel pipes are suitable for potable water supply. They are durable, have a long lifespan, and can withstand high pressure. Additionally, steel pipes are resistant to corrosion and provide a reliable and safe option for transporting potable water.

Q:What are low-pressure carbon steel tubes?: It's pressure levelThe design pressure (P) of pressure vessel is divided into four pressure levels: low voltage, medium pressure, high pressure and extra high pressure:(1) low voltage: Code L, 0.1MPa is less than or equal to p<1.6MPa(2) MP: Code M, 1.6MPa is less than or equal to p<10.0MPa(3) high voltage: Code H, 10.0MPa is less than or equal to p<100.0MPa(4) high voltage: Code U, P = 100.0MPa

Q:Can steel pipes be used for brewery installations?: Yes, steel pipes can be used for brewery installations. Steel pipes are often used in breweries for various applications such as transferring fluids, connecting equipment, and creating plumbing systems. Steel pipes are known for their durability, strength, and resistance to corrosion, which makes them suitable for handling the harsh conditions and high-pressure environments typically found in brewery installations. Additionally, steel pipes can be welded together, allowing for seamless connections, ensuring a reliable and leak-free operation. However, it is important to ensure that the steel pipes used in brewery installations meet the necessary standards and regulations to ensure the safety and quality of the beer production process.

Q:Can steel pipes be used for underground pressure pipelines?: Yes, steel pipes can be used for underground pressure pipelines. Steel pipes are known for their strength and durability, making them suitable for various applications, including underground pressure pipelines. They can withstand high pressure and are resistant to corrosion, making them a reliable choice for transporting fluids or gases underground. Additionally, steel pipes are available in different sizes and thicknesses, allowing for customization based on the specific requirements of the pipeline project. However, it is important to ensure proper coating or lining of the steel pipes to prevent corrosion caused by soil conditions or the transported substance. Regular maintenance and inspections are also necessary to ensure the integrity and longevity of the underground pressure pipelines made of steel pipes.

Q:How are steel pipes used in the manufacturing of shipbuilding?: Steel pipes are widely used in shipbuilding for various purposes such as the transportation of fluids, gases, and air systems, as well as structural applications. They are commonly used for the construction of ship hulls, bulkheads, and decks, providing strength and durability to withstand the harsh marine environment. Steel pipes are also used in the installation of various systems onboard, including fuel, water, and sewage systems, as well as ventilation and firefighting systems. Overall, steel pipes play a vital role in the construction and operation of ships, ensuring their functionality and safety.

Q:What are the factors to consider when designing a steel pipe system?: When designing a steel pipe system, several factors need to be considered to ensure its functionality, durability, and efficiency. These factors include: 1. Pressure and temperature requirements: Determining the maximum pressure and temperature that the steel pipe system will be exposed to is crucial. This information is essential for selecting the appropriate pipe material, thickness, and jointing method to withstand the system's operating conditions. 2. Pipe material: Choosing the right material for the steel pipe system is important. Factors such as corrosion resistance, strength, and cost should be considered. Common materials for steel pipes include carbon steel, stainless steel, and alloy steel. 3. Pipe size and thickness: Calculating the adequate pipe size and wall thickness is essential to ensure the required flow rate and pressure drop within the system. The pipe size affects the system's efficiency and must be chosen based on the anticipated flow rates and pressure losses. 4. Support and anchoring: Proper support and anchoring are critical to prevent sagging, movement, and stress on the steel pipe system. The design should consider the weight of the pipes, the fluid being transported, and any external forces that may act on the system. 5. Expansion and contraction: Steel pipes expand and contract with temperature variations, causing stress on the system. Expansion joints or loops should be incorporated to allow for thermal growth and contraction, preventing damage and distortion. 6. Fluid compatibility: Understanding the properties of the fluid being transported, such as corrosiveness, viscosity, and potential for sedimentation or scaling, is important in selecting the appropriate pipe material and protective coatings or linings. 7. Accessibility and maintenance: Consideration should be given to the accessibility of the system for installation, inspection, and maintenance purposes. Proper access points, valves, and fittings should be included in the design to allow for easy maintenance and repairs. 8. Environmental factors: The steel pipe system may be exposed to various environmental conditions, such as extreme temperatures, humidity, or corrosive substances. These factors should be considered when selecting the pipe material, protective coatings, and insulation. 9. Regulatory compliance: Compliance with applicable industry standards, codes, and regulations is essential. The design should adhere to safety guidelines and applicable building codes to ensure the pipe system's integrity and longevity. 10. Cost consideration: Finally, the overall cost of the steel pipe system, including material, installation, maintenance, and energy consumption, should be taken into account. Balancing cost-effectiveness with performance requirements is crucial in achieving an efficient and economical design. By considering these factors, engineers and designers can create a steel pipe system that is suitable for its intended purpose, ensuring its longevity, reliability, and safety.

Q:How are steel pipes classified based on their end connections?: Steel pipes can be classified based on their end connections into threaded, socket weld, butt weld, and flanged connections.

Q:What is the difference between hot-dip galvanizing and electroplating for steel pipes?: Hot-dip galvanizing and electroplating are two common methods used to provide corrosion protection for steel pipes, but there are key differences between the two processes. Hot-dip galvanizing involves immersing the steel pipes into a bath of molten zinc, which forms a metallurgical bond with the steel. This results in a thick and durable zinc coating that provides excellent corrosion resistance. The process of hot-dip galvanizing creates a uniform coating that covers the entire surface of the steel pipe, including both the external and internal surfaces. This makes hot-dip galvanizing particularly effective for protecting both the inside and outside of the pipes. On the other hand, electroplating is a process that involves the deposition of a thin layer of metal onto the surface of the steel pipes using an electric current. In the case of electroplating for steel pipes, typically a layer of zinc is applied. Unlike hot-dip galvanizing, electroplating does not provide a metallurgical bond between the zinc and the steel. Instead, it creates a mechanical bond, which is not as strong or durable as the bond formed through hot-dip galvanizing. The electroplated zinc layer is thinner compared to hot-dip galvanizing, which means it may not provide the same level of corrosion protection. Another difference between hot-dip galvanizing and electroplating is the application process. Hot-dip galvanizing requires immersing the steel pipes into a bath of molten zinc, which can be a time-consuming process. Electroplating, on the other hand, involves applying the zinc coating through an electrolytic cell, which can be faster and more efficient. In summary, the main difference between hot-dip galvanizing and electroplating for steel pipes lies in the thickness and durability of the coating, as well as the bonding mechanism between the zinc and the steel. Hot-dip galvanizing provides a thicker and more durable coating with a metallurgical bond, making it more effective for long-term corrosion protection. Electroplating, on the other hand, creates a thinner coating with a mechanical bond, which may be suitable for applications requiring a less robust level of corrosion resistance.

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