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:How do you join two steel pipes together without welding?: There are various ways to join two steel pipes together without welding. Mechanical fittings or connectors are commonly used for this purpose. These fittings are designed to securely connect pipes without the need for welding. Here are a few options you can explore: 1. Threaded Fittings: You can use threaded fittings, which have male and female threads that allow you to screw them together. To join the pipes, you will need to cut the ends of the pipes to create male and female threads. Apply thread sealant to ensure a tight and leak-free connection. 2. Compression Fittings: Another option is compression fittings, which consist of a nut, a compression ring, and a compression seat. These fittings create a tight seal by compressing the ring against the seat. Simply slide the compression ring and nut onto the pipe ends, and use a wrench to tighten the nut until a secure connection is formed. 3. Flange Connections: Flange connections involve using flanges, which are flat plates with bolt holes, to join the pipes. The flanges are bolted together using gaskets to create a tight seal. This method is commonly used for larger diameter pipes or in situations where frequent disassembly may be necessary. 4. Grooved Couplings: Grooved couplings are another option, particularly in plumbing and fire protection systems. They utilize a mechanical coupling housing with two grooved ends that fit over the pipe ends. The coupling is then secured using bolts or screws, which tighten the housing around the pipe ends, creating a secure connection. Before deciding on a method, it is crucial to consider the specific requirements of your application, such as the pipe diameter, pressure, and temperature. Additionally, ensure that the chosen method complies with relevant industry standards and regulations to ensure a safe and reliable connection.

Q:Can steel pipes be used for underground cable ducting?: Yes, steel pipes can be used for underground cable ducting. Steel pipes are commonly used for underground cable ducting due to their durability and strength. They provide a protective casing for the cables, preventing damage from external factors such as moisture, pressure, and environmental elements. Steel pipes are also resistant to corrosion, which makes them a suitable choice for long-term use underground. Additionally, steel pipes can withstand heavy loads, making them ideal for areas where cables may be subjected to high pressure or weight. However, it is important to consider factors such as soil conditions, installation requirements, and the specific needs of the cable system before choosing steel pipes for underground cable ducting.

Q:How are steel pipes used in the construction of power transmission lines?: Steel pipes are commonly used in the construction of power transmission lines as they provide a strong and durable structure to support the weight of the lines and withstand environmental conditions. These pipes serve as the main support structure for overhead power lines and are often used to elevate the lines above ground level or across bodies of water. Additionally, steel pipes are used to protect and encase underground power cables, ensuring their safety and longevity.

Q:What is the maximum pressure that steel pipes can withstand?: The maximum pressure that steel pipes can withstand depends on various factors such as the grade and thickness of the steel, the diameter and length of the pipe, and the specific application. However, steel pipes are known for their high strength and durability, allowing them to withstand significant pressures ranging from several hundred to several thousand pounds per square inch (psi).

Q:What is lined pipe?: Pipe lining is a new technology in recent ten years of development, also called composite pipe conveying fluid with different needs, the use of different materials to make the durability of the pipeline inner wall and outer wall of pipeline, to ensure the purity of the fluid, pipeline adaptability, performance is greatly improved, more extensive use.

Q:Can steel pipes be recycled?: Yes, steel pipes can be recycled. Steel is a highly recyclable material and can be used to create new steel products, including pipes, through processes like melting and reshaping. This helps to conserve natural resources, reduce energy consumption, and minimize waste.

Q:Can steel pipes be used for conveying compressed air?: Indeed, compressed air can indeed be conveyed through steel pipes. In industrial settings, steel pipes find frequent use due to their ability to withstand high pressure and maintain durability. With their remarkable tensile strength, steel pipes prove capable of handling the immense pressures generated by compressed air systems. Furthermore, the resistance of steel pipes to corrosion becomes crucial when confronted with moisture within compressed air. Nevertheless, it remains vital to guarantee that the steel pipes are adequately sized and rated to meet the precise pressure and flow prerequisites of the compressed air system. Moreover, adhering to proper installation and maintenance practices becomes imperative to avert any potential leaks or failures.

Q:The difference between 12Cr1MoVG alloy steel tube and 15CrMo: With this kind of steel manufacturing products, usually by heat treatment (normalizing and tempering); parts made before use, usually need to go through refining or chemical surface treatment (carburizing and nitriding), surface quenching or high-frequency quenching treatment. Therefore, according to the chemical composition (mainly carbon content), heat treatment process and use of different, such steel can be roughly divided into carburizing, quenching and tempering and nitriding steel three.

Q:What is the hardness of steel pipes?: The specific grade and manufacturing process can cause the hardness of steel pipes to vary. Generally, alloys are used to make steel pipes, which offer a combination of strength and toughness. To determine the hardness of steel pipes, different methods like Rockwell or Brinell hardness tests can be carried out. These tests gauge the steel's resistance to indentation or penetration using a standardized indenter. The hardness of steel pipes is usually represented as a numerical value on a scale, like the Rockwell hardness scale (e.g., HRC or HRB) or the Brinell hardness scale (e.g., HB). The hardness of steel pipes is significant as it indicates their capacity to endure physical stresses, such as pressure, impact, or wear, in various applications such as construction, oil and gas transportation, and manufacturing.

Q:How are steel pipes measured and categorized?: Steel pipes are typically measured and categorized based on their outer diameter (OD) and wall thickness. The OD is measured in inches or millimeters, while the wall thickness is measured in inches or centimeters. Pipes are further categorized based on their schedule, which refers to the wall thickness and determines the pressure rating of the pipe. The schedule is denoted by a letter or number, such as Schedule 40 or Sch 80. These measurements and categorizations help in selecting the appropriate steel pipe for different applications and ensure compatibility with fittings and other components.

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