Seamless steel tube for transmission of fluids

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Standard：
GB／T8163 Chinese national standard
Application：
General seamless steel tubes for conveying fluids
Models of major steel tubes：
10．20，Q345，etc．

Diamensional tolerances:

Types of steel tubes	Outer diameter		Wall thickness
Cold-rolled tubes	Tube sizes(mm)	Tolerances(mm)	Tube sizes (mm)	Tolerances(mm)
	＞30～50	±0.3	≤30	±10％
	＞50～219	±0.8％	≤30	±10％
Hot-rolled tubes	＞219	±1.0％	＞20	±10％

Mechanical properties：

Standard codes	Models of steel tubes	Tensite strength（MPa）	Yield strength（MPa）	Elongation（％）
GB/T8163	10	335～475	≥205	≥24
	20	410～550	≥245	≥20
	Q345	490～665	≥325	≥21

Chemical composition:

Standard codes	Models of steel tubes	Chemical compositions（％）
Standard codes	Models of steel tubes	C	Si	Mn	P	S	Cr	Ni	Cu
GB/T8163	10	0.07～0.14	0.17～0.37	0.35～0.65	≤0.035	≤0.035	≤0.15	≤0.25	≤0.25
	20	0.17～0.24	0.17～0.37	0.35～0.65	≤0.035	≤0.035	≤0.25	≤0.25	≤0.25
	Q345	0.12～0.20	0.20～0.55	1.20～1.60	≤0.045	≤0.045	/	/	/

Q: What are the factors that affect the price of steel pipes?: The factors that affect the price of steel pipes include the cost of raw materials, such as iron ore and coal, as well as the demand and supply dynamics in the steel industry. Other factors include labor costs, energy prices, transportation costs, and any taxes or tariffs imposed on steel imports. Additionally, market conditions, global economic trends, and government regulations can also influence the price of steel pipes.

Q: What are the different types of steel pipe couplings?: In the market, there exists a variety of steel pipe couplings to cater to specific applications and needs. The following are some of the commonly used types: 1. Threaded Coupling: This coupling is equipped with threaded ends for easy installation and removal. It is suitable for low-pressure applications and can be used with both threaded and non-threaded pipes. 2. Compression Coupling: Designed to create a secure and leak-proof connection between two pipes, compression couplings consist of two pieces that are tightened together using compression nuts or sleeves, thus forming a tight seal. 3. Slip-On Coupling: A slip-on coupling is a simple and convenient option that can be easily installed by sliding it onto the pipe ends and then securing it in place through welding or bolting. It is commonly used to join pipes with plain ends and is suitable for both high and low-pressure applications. 4. Grooved Coupling: Grooved couplings possess a groove on both pipe ends, allowing them to be connected by using a rubber gasket and coupling housing. This type of coupling ensures a reliable and flexible connection that can accommodate minor misalignments and vibrations. 5. Flanged Coupling: Consisting of two flanges bolted together with a gasket in between, flanged couplings are widely used in high-pressure applications due to their strength and reliability. 6. Welded Coupling: Welded couplings are permanently joined to the pipe ends through a welding process. This type of coupling guarantees a strong and durable connection that is resistant to leaks and vibrations. These examples represent only a fraction of the steel pipe couplings available. The choice of coupling depends on factors such as the pipe type, application requirements, and the desired level of strength and flexibility. It is crucial to select the appropriate coupling to ensure a secure and dependable connection between pipes.

Q: How are steel pipes used in the telecommunications industry?: Steel pipes are used in the telecommunications industry primarily for the installation and protection of underground fiber optic cables. These pipes provide a sturdy and durable infrastructure for the cables, ensuring their safety from external factors such as weather conditions or accidental damage. Additionally, steel pipes are also used for the construction of telecommunication towers, providing the necessary strength and support for antennas and other equipment.

Q: How do you protect steel pipes from external damage?: To protect steel pipes from external damage, several measures can be taken. 1. Coating: Applying a protective coating on the surface of the steel pipes can help prevent external damage. Common coating options include epoxy, polyethylene, and fusion bonded epoxy (FBE) coatings. These coatings act as a barrier between the pipes and the surrounding environment, shielding them from corrosion, abrasion, and other external factors. 2. Cathodic Protection: This method involves using a sacrificial anode or impressed current to protect the steel pipes from corrosion. By connecting a less noble metal to the pipes, it attracts the corrosive elements, sacrificing itself instead of the pipes. This process helps extend the lifespan of the pipes and prevents external damage. 3. Wrapping and Taping: Wrapping the steel pipes with materials such as polyethylene or polypropylene tapes provides an extra layer of protection. These tapes act as a barrier against moisture, chemicals, and physical impact, safeguarding the pipes from external damage. Additionally, heat shrink sleeves can be used to provide insulation and protection against corrosion. 4. Underground Installation: Proper installation of steel pipes underground is crucial to protect them from external damage. This includes ensuring suitable trench depth, backfilling with appropriate materials, and avoiding excessive bending or stress on the pipes during installation. Proper bedding and padding techniques also contribute to the pipes' protection from external factors. 5. Regular Inspection and Maintenance: Periodic inspection and maintenance are essential to detect any signs of external damage early on. This can involve visual inspections, non-destructive testing, or even utilizing advanced technologies like pipeline integrity management systems. Timely repairs and maintenance can help prevent further damage and extend the lifespan of the steel pipes. Overall, protecting steel pipes from external damage requires a combination of preventative measures, proper installation techniques, and regular maintenance. By implementing these strategies, the pipes can be safeguarded against corrosion, abrasion, impact, and other factors that may compromise their integrity.

Q: What are the different types of steel pipe unions?: Various industries and applications commonly utilize several types of steel pipe unions. Some of the most frequently used types are as follows: 1. Threaded Union: This union features female threads on both ends, facilitating easy attachment to two male threaded pipes. It ensures a reliable connection that is resistant to leaks. 2. Socket Weld Union: On one end, this union has a socket, while the other end is equipped with a female threaded connection. It is specifically designed for socket welding, where the pipe is inserted into the socket and then welded around the joint, resulting in a robust and long-lasting connection. 3. Butt Weld Union: This specific union is employed for joining two pipes with butt weld ends. It necessitates beveling the pipes and subsequently welding them together, creating a sturdy and permanent connection. 4. Compression Union: Typically used for connecting pipes made of softer materials like copper or plastic, compression unions consist of a compression nut and a compression ring. These components are tightened onto the pipe, ensuring a tight and secure seal. 5. Flanged Union: This union is equipped with flanges on both ends, allowing it to be bolted onto two flanged pipes. Flanged unions are commonly utilized in applications where easy disassembly and reassembly are necessary. 6. Grooved Union: Grooved unions possess grooves on their ends, which are utilized for connecting pipes by inserting them into the grooves and securing them with a coupling. They are often utilized in fire protection systems and other applications where quick installation and easy maintenance are of utmost importance. These examples represent only a fraction of the numerous types of steel pipe unions available. The selection of a union depends on the specific requirements of the application, such as the pipe material, size, and operating conditions. Seeking advice from a professional or consulting industry standards can aid in determining the most suitable union for a particular project.

Q: What's the use of steel pipe?: (processing workshop of Tianjin steel pipe company as a result of the steel pipe truss structure, the actual steel saving up to 42.9%), with a steel pipe manufacturing highway bridge can not only save steel, simplify the construction, but also can greatly reduce the coated area, saving investment and maintenance costs.

Q: What's wrong with the 3PP anticorrosive steel tube?: PP and PE are similar in processability, and the 3PE coating can be used to produce 3PP coatings without the need for a special 3PP coating line. However, the difference between PP and PE materials makes the 3PP and 3PE coatings show different properties, which can be applied to different environments. The advantages of 3PP coating on some properties make it possible to play an important role in the field of 3PE coating. Therefore, many foreign pipeline projects use 3PP anticorrosive coating.

Q: What is the difference between steel pipes and concrete-lined pipes?: Steel pipes are made entirely of steel and are known for their strength and durability. They are commonly used in various applications, including transporting liquids and gases, as well as structural support. On the other hand, concrete-lined pipes are made of steel with a layer of concrete applied to the inner surface. This concrete lining provides additional protection against corrosion and abrasion, making them suitable for transporting corrosive materials or in aggressive environments. The concrete lining also helps in reducing friction within the pipe, resulting in improved flow efficiency.

Q: What are the factors affecting the price of steel pipes?: There are several factors that can affect the price of steel pipes. Some of the key factors include the cost of raw materials such as iron ore and other metals, energy prices, labor costs, transportation costs, and market demand and supply dynamics. Additionally, currency exchange rates, government regulations, and trade policies can also impact the price of steel pipes in the global market.

Q: What are the different types of expansion joints used with steel pipes?: There are several types of expansion joints commonly used with steel pipes, including bellows expansion joints, slip expansion joints, and flanged expansion joints. Bellows expansion joints are flexible connectors made of a series of convolutions that allow for axial, lateral, and angular movement. Slip expansion joints consist of two pipe sections with a sliding sleeve in between, allowing for limited axial movement. Flanged expansion joints are designed with flanged ends to provide flexibility and accommodate movement in all directions. These various types of expansion joints are used to absorb thermal expansion, vibration, and misalignment in steel pipe systems.

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