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:What are the disadvantages of using steel pipes?
- One major disadvantage of using steel pipes is their susceptibility to corrosion. Over time, exposure to moisture and certain chemicals can cause the pipes to rust and weaken, leading to leaks or structural damage. Additionally, steel pipes are generally heavier and more expensive than alternative materials, making them less suitable for certain applications where weight and cost are crucial factors.
- Q:What are the common methods for repairing steel pipes?
- There are several common methods for repairing steel pipes, depending on the nature and extent of the damage. One common method is welding, which involves melting the damaged area and fusing it with a new piece of steel. This method is often used for small cracks or holes in the pipe. Welding can be done using various techniques such as shielded metal arc welding (SMAW), gas metal arc welding (GMAW), or tungsten inert gas (TIG) welding. Another method is pipe wrapping or bandaging, which involves wrapping a layer of adhesive tape or resin-soaked fiberglass around the damaged section of the pipe. This method is suitable for small leaks or corrosion spots and provides a temporary fix until a more permanent solution can be implemented. If the damage is extensive or the pipe is severely corroded, pipe lining or relining may be necessary. This involves inserting a new pipe liner inside the existing one, effectively creating a new pipe within the old one. This method can be done using various materials such as epoxy, polyethylene, or cured-in-place pipe (CIPP). Pipe lining is commonly used for larger diameter pipes or when replacement is not feasible. In some cases, pipe clamps or sleeves can be employed to repair minor leaks or cracks. These devices are designed to be clamped around the damaged section and provide a temporary or permanent solution depending on the severity of the damage. Ultimately, the choice of repair method depends on factors such as the extent of damage, accessibility of the damaged area, budget constraints, and the long-term durability required. It is advisable to consult with a professional pipe repair specialist to assess the specific situation and determine the most suitable method for repairing steel pipes.
- Q:How do you repair damaged steel pipes?
- To fix steel pipes that have been damaged, there are several steps you can take: First, you need to determine the extent of the damage. Assess how severe it is to decide if you can repair it or if you need to replace the entire pipe. Next, isolate and drain the section that is damaged. Shut off the water supply to that part of the pipe and drain any remaining water to prevent further leaks or damage. After that, clean the damaged area by removing any dirt, rust, or debris. You can use a wire brush or sandpaper for this job. Then, prepare the damaged area by roughening the surface with coarse sandpaper. This will help the repair material adhere better to the pipe. Next, choose a repair method based on the size and location of the damage. There are different options available such as using epoxy putty, pipe wraps, or clamps. Once you've chosen a repair method, follow the instructions provided to apply the repair material to the damaged area. Make sure it covers the entire damaged section and extends slightly beyond it for added protection. After applying the repair material, allow it to cure according to the manufacturer's instructions. This will ensure a strong bond and effective sealing of the damaged area. Once the repair has cured, turn the water supply back on and check for any leaks. If there are no signs of leakage, then the repair has been successful. If there are still leaks, you may need to reconsider the repair or seek professional help. Keep in mind that these steps are a general guideline for repairing damaged steel pipes. The specific repair method may vary depending on the size and severity of the damage. In more complex cases or if you're unsure, it's best to consult a professional plumber or pipe repair specialist.
- Q:How are steel pipes protected against external mechanical damage?
- Steel pipes are protected against external mechanical damage through various methods. One common method is the use of protective coatings. These coatings provide a physical barrier between the steel surface and external forces, such as impact or abrasion. Coatings can be applied through processes like painting, epoxy coating, or wrapping the pipe with materials like polyethylene or polypropylene. Another method of protection is the use of external casing or encasement. Casing pipes are installed around the steel pipes to provide an additional layer of protection. These casing pipes are typically made of materials like concrete, PVC, or ductile iron, which are resistant to external mechanical damage. Furthermore, steel pipes can be protected by using supports and restraints. Properly designed supports and restraints help to distribute external forces evenly and prevent excessive stress or deformation on the pipe. This includes using hangers, clamps, or brackets to secure the pipe in place and minimize the risk of mechanical damage. In addition, steel pipes can be protected by implementing measures to prevent accidental impacts or collisions. This can involve installing protective barriers, fencing, or warning signs to alert people to the presence of pipelines and prevent unintentional damage. Overall, a combination of protective coatings, casing, supports, and preventive measures is utilized to ensure that steel pipes are safeguarded against external mechanical damage. These measures help to maintain the structural integrity of the pipes and ensure their long-term performance and reliability.
- Q:How do you calculate the pipe friction loss coefficient for steel pipes?
- The pipe friction loss coefficient for steel pipes can be calculated using the Darcy-Weisbach equation, which takes into account the pipe diameter, length, roughness, and fluid velocity. The coefficient can be determined by dividing the friction factor (obtained from Moody's chart or using empirical equations) by the Reynolds number (calculated using the fluid properties and pipe dimensions).
- Q:Can steel pipes be used for underground culverts?
- Yes, steel pipes can be used for underground culverts. Steel pipes are commonly used for underground culverts due to their strength, durability, and resistance to corrosion. They provide a reliable solution for conveying water or other fluids underground, ensuring efficient drainage and water management systems.
- Q:What are the different types of fittings used with steel pipes?
- There are several different types of fittings that are commonly used with steel pipes. These fittings are designed to connect, control, or change the direction of flow in a piping system. Some of the different types of fittings used with steel pipes include: 1. Elbow fittings: These fittings are used to change the direction of flow in a piping system. They come in various angles, such as 45 degrees or 90 degrees, and are commonly used to navigate around obstacles or create bends in the pipe. 2. Tee fittings: Tee fittings are used to create a branch or split in a piping system. They have three openings, with one being perpendicular to the other two. This allows for the connection of two pipes at a 90-degree angle. 3. Coupling fittings: Couplings are used to connect two pipes of the same size together. They are usually threaded and can be easily tightened or removed using a wrench. Couplings are commonly used in applications where pipes need to be joined or repaired. 4. Reducer fittings: Reducers are used to connect pipes of different sizes together. They have one end that is larger in diameter and another end that is smaller. Reducers are often used to transition between pipe sizes or to adapt to different equipment or fittings. 5. Flange fittings: Flanges are used to connect pipes, valves, or other equipment to create a secure and leak-proof connection. They consist of a flat, circular plate with holes for bolts or screws to fasten the flange to the pipe. Flange fittings are commonly used in applications where frequent disassembly and reassembly is required. 6. Union fittings: Union fittings are used to join two pipes together in a manner that allows for easy disconnection. They consist of three parts: a nut, a female end, and a male end. Union fittings are often used in applications where periodic maintenance or repairs are necessary. 7. Cap fittings: Cap fittings are used to seal the end of a pipe. They are typically threaded and can be easily screwed onto the end of the pipe. Cap fittings are commonly used in applications where pipes need to be temporarily closed off or protected. These are just a few examples of the different types of fittings used with steel pipes. The specific type of fitting required will depend on the application, the size and material of the pipe, and the desired functionality of the piping system.
- Q:How do steel pipes withstand pressure?
- Steel pipes withstand pressure due to their inherent strength and resilience. The high tensile strength and durability of steel allow it to withstand the internal pressure exerted by fluids or gases flowing through the pipes. Additionally, the thick walls and cylindrical shape of the steel pipes distribute the pressure evenly, preventing any deformation or rupture. The seamless construction of steel pipes further enhances their ability to withstand pressure, making them a reliable choice for various applications in industries such as oil and gas, plumbing, and construction.
- Q:Can steel pipes be used for underground cable ducting?
- Underground cable ducting can utilize steel pipes, as they possess durability and strength. Due to their robustness, steel pipes commonly serve as a protective casing for cables, warding off potential harm from external factors like moisture, pressure, and environmental elements. Moreover, steel pipes exhibit resistance to corrosion, rendering them suitable for extended underground use. In addition, their ability to withstand heavy loads deems them ideal for areas where cables may face high pressure or weight. Nevertheless, before selecting steel pipes for underground cable ducting, it is vital to take into account soil conditions, installation requirements, and the specific needs of the cable system.
- Q:DN80 seamless steel tube, what is the standard thickness?
- Generally speaking, the diameter of the pipe can be divided into outer diameter, inner diameter and nominal diameter. Tubes are made of seamless steel tubes. The outer diameter of the tubes is indicated by the letter D, followed by additional outer diameter dimensions and wall thicknesses such as seamless steel tubes with an outer diameter of 108.
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 |
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|---|---|
| Location | Tianjin,China |
| Year Established | 2000 |
| Annual Output Value | Above Thirty Million RMB |
| Main Markets | China; Europe |
| Company Certifications | ISO9001:2000 |
2. Manufacturer Certificates |
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|---|---|
| a) Certification Name | |
| Range | |
| Reference | |
| Validity Period | |
3. Manufacturer Capability |
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| 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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