Seamless steel tubes for petroleum cracking

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Seamless steel tubes for petroleum cracking

Standard：
GB9948 Chinese national standard
Application：
Served as for furnace tubes，heat exchange tubes and pipelines in petroleum and refinery plants
Model No．of major steel tubes：
1n 9n 1Er!rMn 1rhMn 1f：hM0 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	抗拉强度（MPa）	屈服强度（MPa）	伸长率（％）	冲击功（J）	布氏硬度（HB）	交货状态
GB9948	10	330～490	≥205	≥24	/	/	正火
	20	410～550	≥245	≥21	≥39	/	正火
	15CrMo	440～640	≥235	≥21	≥47	≤170	正火加回火
	1Cr2Mo	≥390	≥175	≥22	≥92	≤179	正火加回火
	1Cr5Mo	≥390	≥195	≥22	≥92	≤187	退火

Chemical composition:

Standard codes	Models of steel tubes	Chemical compositions（％）
Standard codes	Models of steel tubes	C	Si	Mn	P	S	Cr	Mo	Ni
GB9948	10	0.07～0.14	0.17～0.37	0.35～0.65	≤0.035	≤0.035	≤0.15	/	≤0.25
	20	0.17～0.24	0.17～0.37	0.35～0.65	≤0.035	≤0.035	≤0.25	/	≤0.25
	15CrMo	0.12～0.18	0.17～0.37	0.40～0.70	≤0.035	≤0.035	0.80～1.10	0.40～0.55	≤0.30
	1Cr2Mo	≤0.15	0.50～1.00	0.30～0.60	≤0.035	≤0.030	2.15～2.85	0.45～0.65	/
	1Cr5Mo	≤0.15	≤0.50	≤0.60	≤0.035	≤0.030	4.00～6.00	0.45～0.60	≤0.60

Q:How to identify stainless steel pipe and steel pipe?: Stainless steel (Stainless Steel) is referred to as the stainless steel, the resistance of air, steam, water and other weak corrosive medium or with stainless steel known as stainless steel; while the resistance to chemical corrosion (acid, alkali and salt chemical etching) corrosion of steel called acid resistant steel. Because of the difference in the chemical composition of the two, and make their corrosion resistance is different, ordinary stainless steel is generally not resistant to chemical medium corrosion, and acid resistant steel are generally stainless steel.

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 are steel pipes used in the petrochemical industry?: Steel pipes are widely used in the petrochemical industry for transporting and distributing various fluids and gases. They are particularly valuable for their durability, strength, and resistance to corrosion, which is crucial when dealing with highly corrosive substances. Steel pipes are employed in various processes such as refining, oil and gas production, chemical manufacturing, and transportation of petrochemical products. Whether it's conveying raw materials, transferring processed products, or supporting infrastructure, steel pipes play a vital role in ensuring the safe and efficient operation of the petrochemical industry.

Q:What are the different factors affecting the flow rate of steel pipes?: There are several factors that can affect the flow rate of steel pipes. 1. Pipe diameter: The size of the pipe plays a significant role in determining the flow rate. Generally, larger diameter pipes allow for greater flow rates, as they have a larger cross-sectional area for the fluid to pass through. 2. Pipe length: The length of the pipe also affects the flow rate. Longer pipes tend to have higher friction losses, which can reduce the flow rate. Additionally, longer pipes may require higher pressure to maintain the desired flow rate. 3. Fluid viscosity: The viscosity of the fluid passing through the pipe is an important factor. Viscous fluids, such as heavy oils, have a higher resistance to flow, leading to lower flow rates. On the other hand, less viscous fluids, like water, have lower resistance and can achieve higher flow rates. 4. Pressure difference: The pressure difference across the pipe is a driving force for the flow. A higher pressure difference will result in a higher flow rate, while a lower pressure difference will reduce the flow rate. 5. Surface roughness: The roughness of the inner surface of the pipe affects the flow rate. Rougher surfaces create more turbulence and friction, resulting in a lower flow rate. Smoother surfaces, on the other hand, minimize turbulence and friction, allowing for a higher flow rate. 6. Temperature: The temperature of the fluid can impact its viscosity and density, which in turn affects the flow rate. Higher temperatures generally reduce the viscosity of fluids, leading to increased flow rates. 7. Pipe material: Different pipe materials have varying roughness and resistance to flow. Steel pipes, for example, typically have a smoother inner surface compared to pipes made of other materials, resulting in higher flow rates. 8. Pipe fittings and bends: The presence of fittings, valves, and bends in the pipe can cause flow restrictions and pressure drops, which can decrease the flow rate. Proper design and placement of these components can minimize their impact on the flow rate. Overall, the flow rate of steel pipes is influenced by a combination of these factors, and understanding their effects is crucial for designing and optimizing fluid flow systems.

Q:Can steel pipes be used for conveying potable water?: Yes, steel pipes can be used for conveying potable water. However, there are some considerations and precautions that need to be taken into account. Steel pipes are strong and durable, making them suitable for transporting water over long distances. They are also resistant to corrosion and can withstand high pressure. To ensure the safety and quality of the water being transported, it is important to use pipes that are specifically designed and manufactured for potable water applications. These pipes are often coated or lined with materials that prevent the leaching of contaminants into the water, such as epoxy or cement mortar lining. Additionally, regular maintenance and inspections should be conducted to prevent the buildup of sediments or rust that could affect the water quality. It is worth noting that steel pipes can be more expensive compared to other materials like plastic or copper. However, their longevity and reliability make them a cost-effective choice in the long run. It is also important to comply with local regulations and standards regarding the use of steel pipes for conveying potable water to ensure the health and safety of consumers.

Q:How are steel pipes classified based on their end connections?: Steel pipes can be classified based on their end connections into three main categories: threaded, flanged, and welded. Threaded pipes have screw threads on the ends, allowing for easy assembly and disassembly. Flanged pipes have flanges on the ends, which are flat surfaces that can be bolted together, providing a strong connection. Welded pipes have their ends welded together, creating a permanent and secure joint.

Q:Are steel pipes suitable for fire protection systems?: Yes, steel pipes are suitable for fire protection systems. They are highly durable and have excellent resistance to heat and fire. Steel pipes also have superior strength, making them suitable for carrying water or other fire suppressants at high pressure. Additionally, steel pipes have a long lifespan and are able to withstand different environmental conditions, making them a reliable choice for fire protection systems.

Q:What is the difference between steel pipe and concrete pipe?: Steel pipe and concrete pipe are both commonly used for various applications, but they differ significantly in their material composition and properties. Firstly, the main difference lies in the materials used to manufacture these pipes. Steel pipes are made from steel, which is an alloy of iron and carbon. On the other hand, concrete pipes are made from a mixture of cement, aggregate (such as sand or gravel), and water. Secondly, steel pipes are known for their strength and durability. They can withstand high pressure, making them suitable for applications that require transporting fluids or gases under high pressure. Steel pipes also have a high resistance to corrosion, which is advantageous in environments where the pipe is exposed to moisture or chemicals. In contrast, concrete pipes are not as strong as steel pipes and are more prone to cracking or damage under high pressure. However, they are still capable of handling moderate pressure loads and are often used for drainage systems or sewage applications. Another significant difference is the installation process. Steel pipes are typically joined together using welding techniques, such as butt welding or socket welding. This creates a seamless and strong connection between the pipes. On the other hand, concrete pipes are often installed using rubber or gasketed joints, which are easier to assemble and disassemble. Cost is another factor where steel and concrete pipes differ. Steel pipes tend to be more expensive due to the higher cost of steel as a raw material and the additional labor required for welding and fabrication. Concrete pipes, on the other hand, are generally more cost-effective as the materials used in their production are more readily available and the installation process is simpler. In summary, the main differences between steel pipes and concrete pipes lie in their material composition, strength, resistance to corrosion, installation process, and cost. Steel pipes offer superior strength and durability, making them suitable for high-pressure applications and environments prone to corrosion. Concrete pipes, while not as strong, are cost-effective and commonly used for drainage systems or sewage applications.

Q:Can steel pipes be used for gas transportation?: Yes, steel pipes can be used for gas transportation. Steel pipes are commonly used for the transportation of natural gas, propane, and other gases due to their high strength, durability, and resistance to corrosion. They can effectively withstand high pressure and extreme temperatures, making them a reliable choice for gas transportation systems.

Q:What are the factors affecting the pressure rating of steel pipes?: The factors affecting the pressure rating of steel pipes include the material of the pipe, its thickness, diameter, and quality, as well as the temperature and type of fluid being transported. Additionally, the operating conditions, such as the level of stress or strain on the pipe, also play a significant role in determining its pressure rating.

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