Hollow Section-Rectangle Tubes（Hot Rolled/Cold Rolled）
- Ref Price:
-
- Loading Port:
- China Main Port
- 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-Rectangle Tubes（Hot Rolled/Cold Rolled）
Application of Hollow Section-Rectangle Tubes（Hot Rolled/Cold Rolled)
It is widely used in building, machine, chemical equipment, automobile industrial, container, it is also applied to agriculture and mine machine.
ASTM A500, GB6728
Steel grade of Hollow Section-Rectangle Tubes（Hot Rolled/Cold Rolled)
ASTM A500: A, B, C
GB6728：Q195，Q215，Q235，Q345
Size of Hollow Section-Rectangle Tubes（Hot Rolled/Cold Rolled)
*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 |
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 |
Copper, when copper steel is specified, min | 0.20 | 0.18 | 0.2 | 0.18 |
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 |
- Q: Can steel pipes be used for the construction of offshore platforms?
- Yes, steel pipes can be used for the construction of offshore platforms. Steel pipes are commonly used in offshore platforms due to their durability, strength, and resistance to corrosion. They can be utilized for various purposes such as structural support, transportation of fluids, and installation of equipment. Additionally, steel pipes are readily available, cost-effective, and can withstand the harsh marine environment, making them a suitable choice for offshore platform construction.
- Q: What is the process of spiral steel tube production?
- X ray flaw detection: 100% X ray industrial television inspection of internal and external weld seams, and image processing system is adopted to ensure the sensitivity of flaw detection.8. press test: the steel pipe is tested by root test on the water pressure test machine to ensure the test pressure of the steel pipe to meet the standard requirement.9. chamfering flat head: the qualified steel pipe is processed at the end of the pipe to achieve the required size of the end of the pipe10. final inspection: ultrasonic and X ray inspection, and magnetic particle inspection at the end of pipe to check for welding problems and pipe end defects.11., marking: qualified steel pipe for oil, in order to prevent corrosion, and according to user requirements for marking.
- Q: How do you calculate the pipe head loss for steel pipes?
- To calculate the pipe head loss for steel pipes, you can use the Darcy-Weisbach equation. This equation relates the head loss (hL) to the flow rate (Q), pipe diameter (D), pipe length (L), fluid density (ρ), fluid velocity (V), and a friction factor (f). The formula is as follows: hL = (f * (L/D) * (V^2))/(2g) Where: - hL is the head loss (measured in meters) - f is the friction factor (dimensionless) - L is the pipe length (measured in meters) - D is the pipe diameter (measured in meters) - V is the fluid velocity (measured in meters per second) - g is the acceleration due to gravity (usually taken as 9.81 m/s^2) The friction factor (f) depends on the Reynolds number (Re) of the flow, which is a dimensionless quantity representing the ratio of inertial forces to viscous forces. The Reynolds number can be calculated as: Re = (ρ * V * D) / μ Where: - Re is the Reynolds number (dimensionless) - ρ is the fluid density (measured in kg/m^3) - V is the fluid velocity (measured in meters per second) - D is the pipe diameter (measured in meters) - μ is the dynamic viscosity of the fluid (measured in Pa·s or N·s/m^2) The friction factor (f) can be obtained from empirical correlations or from Moody's diagram, which relates it to the Reynolds number and the relative roughness of the pipe surface. By substituting the calculated friction factor (f) and other known values into the Darcy-Weisbach equation, you can determine the head loss in the steel pipe. It is important to note that the head loss is a measure of energy loss due to friction and other factors, and it is typically expressed in terms of pressure drop or height difference.
- Q: How are steel pipes tested for strength and durability?
- Steel pipes are tested for strength and durability through various methods such as hydrostatic testing, non-destructive testing, and mechanical testing. Hydrostatic testing involves pressurizing the pipe with water to check for any leaks or weaknesses. Non-destructive testing techniques like ultrasonic or magnetic particle testing are used to detect any flaws or defects within the pipe. Mechanical testing involves subjecting the pipe to various loads and stresses to assess its performance and resistance to deformation. These tests ensure that steel pipes meet the required standards and are capable of withstanding the intended applications.
- Q: How are steel pipes used in the agriculture sector?
- Steel pipes are commonly used in the agriculture sector for various purposes such as irrigation systems, water transportation, and structural support for greenhouse structures. They are also used for the construction of livestock enclosures and handling equipment. Overall, steel pipes play a crucial role in ensuring efficient and reliable operations in the agriculture industry.
- Q: Are steel pipes suitable for use in acidic environments?
- Steel pipes may not be suitable for use in acidic environments because they can corrode and degrade when exposed to acids, leading to potential leaks and structural issues.
- Q: What is the abrasion resistance of steel pipes?
- The abrasion resistance of steel pipes is high due to their hardness and durability, making them resistant to wear and tear caused by friction or rubbing against surfaces.
- Q: Can steel pipes be used for underground gas storage?
- Certainly! Underground gas storage can indeed utilize steel pipes. Steel pipes are frequently employed in the transportation and storage of diverse gas varieties, such as natural gas, owing to their robustness, longevity, and ability to resist corrosion. These pipes can endure substantial pressures and can be tailored to meet the specific prerequisites of subterranean gas storage installations. Furthermore, materials can be applied to the surfaces of steel pipes, either as a coating or lining, to bolster their resistance to corrosion and avert any possible leaks. Nevertheless, it is crucial to ensure that the correct safety protocols and regulations are adhered to during the construction and operation of underground gas storage facilities to prevent any potential perils or hazards.
- Q: What are the different types of steel pipes available in the market?
- There are several different types of steel pipes available in the market, each designed for specific purposes and applications. Some of the most common types include: 1. Carbon Steel Pipes: These are the most widely used type of steel pipes, known for their strength and durability. They are primarily used for transporting fluids and gases in various industries such as oil and gas, construction, and plumbing. 2. Alloy Steel Pipes: These pipes are made by combining different metals, such as chromium, nickel, or molybdenum, with carbon steel. Alloy steel pipes offer enhanced strength, corrosion resistance, and heat resistance. They are often used in high-pressure applications, such as in power plants and chemical plants. 3. Stainless Steel Pipes: Stainless steel pipes are highly resistant to corrosion and oxidation, making them suitable for applications where hygiene and durability are crucial. They are commonly used in industries like food processing, pharmaceuticals, and water treatment. 4. Galvanized Steel Pipes: These pipes are coated with a layer of zinc to protect them from rust and corrosion. Galvanized steel pipes are commonly used in plumbing systems and outdoor structures, such as fences and handrails. 5. Seamless Steel Pipes: Seamless pipes are produced without any welding or joints, resulting in a smooth and continuous surface. They are known for their high strength and are often used in high-pressure applications. 6. Welded Steel Pipes: Welded pipes are made by rolling or bending a flat steel plate into a cylindrical shape and then welding the edges together. They are commonly used in industries such as construction, oil and gas, and automotive. 7. ERW (Electric Resistance Welded) Steel Pipes: ERW pipes are made by passing a high-frequency electrical current through the steel strip, causing it to heat and form a weld. They are widely used in various applications, including plumbing, water wells, and structural support. 8. LSAW (Longitudinal Submerged Arc Welded) Steel Pipes: LSAW pipes are made by bending and welding steel plates into a cylindrical shape. They are commonly used for transporting large volumes of oil, gas, or water over long distances. These are just a few examples of the diverse range of steel pipes available in the market. The choice of the right type of steel pipe depends on factors such as the intended application, environmental conditions, and budget considerations. It is important to consult with experts or professionals to determine the most suitable type of steel pipe for a specific project or application.
- Q: How are steel pipes used in the manufacturing of telecommunications infrastructure?
- Steel pipes are commonly used in the manufacturing of telecommunications infrastructure for various purposes. They are primarily utilized for the installation of underground or overhead fiber optic cables and other telecommunication lines. Steel pipes provide durability, strength, and protection to the cables against external factors such as weather, vandalism, and other potential damages. They also offer the necessary support and stability for the installation of antennas, towers, and other equipment used in telecommunications networks. Additionally, steel pipes are used for the construction of conduits and ducts that house and protect the cables within a telecommunications 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 |
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Hollow Section-Rectangle Tubes（Hot Rolled/Cold Rolled）
- Ref Price:
-
- Loading Port:
- China Main Port
- Payment Terms:
- TT or L/C
- Min Order Qty:
- 50MT m.t.
- Supply Capability:
- based on order m.t./month
OKorder Service Pledge
Quality Product, Order Online Tracking, Timely Delivery
OKorder Financial Service
Credit Rating, Credit Services, Credit Purchasing
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