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:What are the quality control measures for steel pipe production?: Quality control measures for steel pipe production typically include the inspection of raw materials, monitoring of manufacturing processes, and testing of finished products. These measures ensure that the steel pipes meet the required specifications and standards. Additionally, quality control may involve conducting visual inspections, dimensional checks, non-destructive testing, and mechanical testing to ensure the strength, durability, and overall quality of the pipes.

Q:How many meters per ton of steel tube?: General scaffolding tube diameter 40mm, specifications specify wall thickness of 3.5mm, the actual wall thickness of 3.2 - 3.4mm.The theoretical weight per meter is 3.85kg and the wall thickness is 3mm.Hence a ton of steel is about 260m.

Q:How are steel pipes repaired in case of damage or leaks?: Various methods can be used to repair steel pipes in the event of damage or leaks. Welding is a common approach where a filler material is melted along with the damaged or leaking area, creating a strong bond that seals the leak. This method is effective for small to moderate-sized leaks and finds wide application in industries like oil and gas, plumbing, and construction. Another method involves the use of mechanical couplings. These couplings are designed to connect two sections of pipe securely, ensuring a tight connection. They can be utilized to repair damaged or leaking sections of a steel pipe by removing the damaged area and replacing it with a new section that is linked using the mechanical coupling. This method is particularly useful for larger leaks or damaged sections that cannot be repaired through welding. In certain cases, temporary fixes can be applied using pipe clamps or epoxy compounds. Pipe clamps are employed to seal the damaged area tightly, preventing further leakage. On the other hand, epoxy compounds are directly applied to the damaged or leaking section, creating a temporary seal that stops the leak until a more permanent repair can be carried out. It is essential to consider the severity and location of the damage or leak, as well as the specific requirements of the application, when deciding on the method of repair. In some instances, it may be necessary to replace the entire section of the steel pipe if the damage is extensive or if multiple leaks are present. It is advisable to consult a professional or a specialized pipe repair service to determine the most suitable repair method for a particular situation.

Q:How are steel pipes affected by international trade policies?: Steel pipes can be significantly impacted by international trade policies. These policies can include tariffs, quotas, and other trade barriers that affect the import and export of steel pipes. Changes in trade policies can lead to fluctuations in prices, supply, and demand for steel pipes. Additionally, trade policies can also influence the competitiveness of domestic steel pipe producers in the global market.

Q:Are steel pipes suitable for offshore drilling platforms?: Yes, steel pipes are suitable for offshore drilling platforms. Steel pipes have been used extensively in the offshore drilling industry due to their strength, durability, and corrosion resistance. Offshore drilling platforms operate in harsh marine environments where they are exposed to saltwater, extreme pressure, and temperature variations. Steel pipes are able to withstand these conditions and provide a reliable and long-lasting solution for transporting fluids such as oil and gas from the seabed to the surface. Additionally, steel pipes can be welded together, allowing for easy installation and maintenance on offshore drilling platforms. Overall, steel pipes have proven to be a suitable choice for offshore drilling platforms due to their robustness and ability to withstand the challenging conditions of the marine environment.

Q:Can steel pipes withstand high temperatures?: Yes, steel pipes can withstand high temperatures. Steel is a strong and durable material that has high heat resistance. It can retain its strength and structural integrity even when exposed to extreme heat, making it suitable for various high-temperature applications such as industrial furnaces, power plants, and steam pipelines.

Q:How do you connect steel pipes together?: Various industries commonly employ several methods to connect steel pipes together. One frequently utilized technique is welding, which involves the heating of the steel pipe ends and their subsequent joining using a welding rod or wire. This method results in a robust and enduring connection that can withstand high pressures and temperatures. Threading, another method, entails cutting threads into the ends of the steel pipes. These threaded ends can then be screwed together using pipe fittings such as couplings or unions. Threading is particularly advantageous for smaller diameter pipes as it allows for easy disassembly and reassembly. Flanges also serve as a means to connect steel pipes. These flat, circular discs with holes can be bolted together, providing a secure connection. Flanges are especially suitable for large diameter pipes or those that require frequent disconnection for maintenance or repairs. Pipe fittings, such as couplings, tees, elbows, or reducers, can also be employed for connecting steel pipes. These fittings, typically composed of steel or other materials, are designed for welding, threading, or utilizing other connection methods like grooving or compression. It is important to consider various factors, such as pipe size, application, required strength, and adherence to industry standards or codes, when selecting the appropriate method for joining steel pipes. Consulting with a qualified professional or referring to industry-specific guidelines is essential in making this decision.

Q:How are steel pipes used in the telecommunications sector?: Various purposes in the telecommunications sector commonly make use of steel pipes. Conduit for underground cable installations is the first purpose served by steel pipes. These pipes ensure the safety of fiber optic cables, which carry data and voice signals over long distances, by providing protection and support. The sturdy nature of steel pipes guarantees that the cables remain secure from external factors like moisture, rodents, and accidental damage. Furthermore, the construction of telecommunication towers and masts involves the use of steel pipes. A strong and durable material is required to bear the weight of antennas, transmitters, and other equipment in these structures. For this purpose, steel pipes are ideal due to their high tensile strength and resistance to harsh weather conditions. Additionally, steel pipes are utilized in the installation of overhead communication lines. These lines are often suspended between poles or towers, and steel pipes serve as supports or brackets to hold the cables in place. The corrosion-resistant properties of steel make it a reliable choice for outdoor installations exposed to various elements. In conclusion, steel pipes play a critical role in the telecommunications sector. They provide protection, support, and durability to cable installations, tower constructions, and overhead communication lines. Their strength and resistance to environmental factors make them an essential component in the establishment and maintenance of reliable telecommunications networks.

Q:What are the common standards and specifications for steel pipes?: The common standards and specifications for steel pipes include ASTM A53, ASTM A106, API 5L, and ISO 3183. These standards outline the requirements for the manufacturing, dimensions, and mechanical properties of steel pipes used in various industries such as oil and gas, construction, and transportation. Additionally, specific applications may have their own standards and specifications that need to be met for quality and safety purposes.

Q:How to make the steel pipe spray paint is not easy to fall off?: First you will rust steel, to clean, good quality alkyd rustproof paint, completely dry after brushing paint, color to see his kind of love.

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