Seamless steel tubes for ships

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Standards：
Standard for malerials and wielding from Chinese classifying society Chinese clasifying society(CCS)
Standard of DNV Det Norske Veritas(DNV)
Standard of Lloyd’S Register of UK(LR)　Lloyd’S Register of UK(LR)Standard of Germanischer Lloyd Germanischer Lloyd(GL)
Standard of American Bureau of Shipping(ABS)American Bureau of Shipping(ABS)
Standard of BUREAU VERITAS(BV)BUREAU VERITAS(BV)
Standard of RINA Italian classification society(RINA)
Standard of NIPPON KAIJI KYOKAI(NK)NIPPON KAIJI KYOKAI(NK)
GB／T5312 Chinese national standard
Appication：
Seamless steel tubes for manufacturing marine boilers and ovemeaters as we as pressure pipes opf grade I and Ⅱ．
Model N0．of major steel tubes
320，360，410，460，490，etc．

Types of steel tubes	Outer diameters		wall thickness
Cold-rolled tubes	Rube size(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％

Mechanocal properties：

Standard code	Models of steel tubes	Tensile strength（MPa）	Yield strength（MPa）	Elongation（％）
GB/T5312	320	320～410	≥195	≥25
	360	360～480	≥215	≥24
	410	410～530	≥235	≥22
	460	460～580	≥265	≥21
	490	490～610	≥285	≥21

Chemical compisition:

Standard code	Models of steel tubes	Chemical compisition（％）
Standard code	Models of steel tubes	C	Si	Mn	P	S
GB/T5312	320	≤0.16	≤0.35	0.40～0.70	≤0.035	≤0.035
	360	≤0.17	≤0.35	0.40～0.80	≤0.035	≤0.035
	410	≤0.21	≤0.35	0.40～1.20	≤0.035	≤0.035
	460	≤0.22	≤0.35	0.80～1.40	≤0.035	≤0.030
	490	≤0.23	≤0.35	0.80～1.50	≤0.035	≤0.030

Note：residual elements:Cr≤0.25％，Mo≤0.10％，Ni≤0.30％，Cu≤0.30％aggregate≤0.70％

Q: Can steel pipes be used for airport construction?: Yes, steel pipes can be used for airport construction. Steel pipes are commonly used in various applications in the construction industry, including airports. They are often used for underground utilities such as water and sewage lines, as well as for structural purposes such as supporting the airport terminal building. Steel pipes offer several advantages for airport construction. Firstly, they have high strength and durability, making them suitable for handling heavy loads and withstanding adverse weather conditions. This is important for ensuring the safety and stability of airport structures. Secondly, steel pipes are versatile and can be easily customized to fit specific project requirements. They come in various sizes and thicknesses, allowing for flexibility in design and construction. Additionally, steel pipes can be welded or joined together to create longer sections, which simplifies installation and reduces construction time. Moreover, steel pipes are resistant to corrosion, which is crucial in airports where there is constant exposure to moisture, salt, and other environmental factors. Their resistance to corrosion ensures the longevity and reliability of the infrastructure. Lastly, steel pipes are cost-effective compared to other materials such as concrete or PVC. They have a relatively low maintenance requirement and a long lifespan, reducing the need for frequent repairs or replacements, thus saving time and money in the long run. In conclusion, steel pipes are a suitable choice for airport construction due to their strength, durability, versatility, corrosion resistance, and cost-effectiveness.

Q: How are steel pipes used in water transportation?: Steel pipes are commonly used in water transportation due to their durability and strength. They can be used for various purposes, such as carrying water from a source to a treatment plant, distributing water to different areas, and even for sewage systems. Steel pipes are highly resistant to corrosion and can withstand high pressure, making them ideal for long-distance water transportation.

Q: How are steel pipes used in the defense sector?: Steel pipes are used in the defense sector for various purposes such as constructing military infrastructure, manufacturing weapons, and creating protective barriers. They are often utilized in the construction of military bases, ammunition storage facilities, and communication systems. Steel pipes are also crucial for manufacturing armored vehicles, artillery, and missile systems. Additionally, they are employed in creating barriers and fortifications to enhance security and defense capabilities.

Q: What are the different types of steel pipe coatings for underground gas pipelines?: There are several types of steel pipe coatings used for underground gas pipelines, including fusion bonded epoxy (FBE) coating, three-layer polyethylene (3LPE) coating, and three-layer polypropylene (3LPP) coating. These coatings provide protection against corrosion, abrasion, and other external factors, ensuring the longevity and safety of the gas pipelines.

Q: Can steel pipes be used for underground fuel pipelines?: Indeed, underground fuel pipelines can utilize steel pipes for their construction. Steel pipes are widely favored for different pipeline applications owing to their exceptional durability, strength, and resistance to corrosion. In the case of underground fuel pipelines, steel pipes are particularly sought-after due to their capacity to endure significant pressure and fluctuations in temperature. Moreover, by shielding against external factors like soil shifts and chemical reactions, steel pipes offer exceptional safeguarding to the fuel transportation system, ensuring its safety and integrity. Through appropriate insulation and coating, the corrosion resistance of steel pipes can be further enhanced, solidifying their dependability as a choice for underground fuel pipelines.

Q: What are the quality control measures for steel pipe manufacturing?: Quality control measures for steel pipe manufacturing typically include: 1. Raw material inspection: Ensuring that the steel used for manufacturing pipes meets the required specifications and standards. 2. Dimensional checks: Verifying the outer diameter, wall thickness, and length of the pipes to ensure they meet the specified tolerances. 3. Visual inspection: Examining the surface of the pipes for any defects, such as cracks, pits, or corrosion, that could impact their quality or performance. 4. Mechanical testing: Conducting tests, such as tensile strength, yield strength, and hardness tests, to assess the mechanical properties of the pipes. 5. Non-destructive testing (NDT): Employing techniques like ultrasonic testing, magnetic particle inspection, or radiography to detect internal defects or flaws in the pipes without damaging them. 6. Welding inspection: Assessing the quality and integrity of welds used in joining pipe sections together, ensuring they meet the required standards. 7. Coating inspection: Checking the applied protective coatings for uniformity, adhesion, and resistance to corrosion or other environmental factors. 8. Pressure testing: Subjecting a sample of pipes to a hydraulic or pneumatic pressure test to verify their ability to withstand the intended operating conditions without leakage or failure. 9. Packaging and labeling: Ensuring proper packaging and labeling of the pipes, including identification of grade, size, and other relevant details, to facilitate easy identification and handling. 10. Documentation: Maintaining comprehensive records of all quality control activities, including test results, inspection reports, and certifications, for traceability and quality assurance purposes.

Q: What is the creep resistance of steel pipes?: The ability of steel pipes to withstand deformation or elongation over time when exposed to high temperatures and constant stress is referred to as their creep resistance. Steel pipes are highly regarded for their exceptional resistance to creep because of the inherent strength and stability of the material. The creep resistance of steel pipes can vary depending on factors like the composition of the alloy, heat treatment, and the conditions in which they are used. Creep is a phenomenon that occurs at elevated temperatures, causing materials to slowly deform under constant stress. In the case of steel pipes, this can be a concern in applications where they are subjected to high temperatures for extended periods, such as in power plants, industrial furnaces, or steam pipelines. The ability to resist creep deformation is crucial to maintain the structural integrity and longevity of the pipes. Steel pipes are often designed and manufactured using alloys with high creep resistance properties, such as chromium-molybdenum (Cr-Mo) steels or nickel-based alloys. These alloys possess excellent mechanical strength, thermal stability, and resistance to oxidation and corrosion, all of which contribute to their superior creep resistance. Moreover, heat treatment processes like quenching and tempering can significantly enhance the creep resistance of steel pipes. These treatments involve controlled heating and cooling cycles to optimize the microstructure of the steel, thereby increasing its resistance to deformation and improving its overall performance at high temperatures. It is important to note that the creep resistance of steel pipes is typically specified by industry standards and codes, such as the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code. These standards define the allowable stress levels and design criteria for different steel pipe applications, ensuring that they meet the necessary safety and performance standards. In summary, steel pipes are renowned for their excellent creep resistance due to their inherent strength, stability, and ability to withstand high temperatures. The specific creep resistance of steel pipes may vary depending on factors such as alloy composition, heat treatment, and operating conditions. Proper design and adherence to industry standards are essential to ensure the desired creep resistance and overall performance of steel pipes in various applications.

Q: Can steel pipes be bent?: Yes, steel pipes can be bent. The process of bending steel pipes typically involves using specialized tools and techniques such as pipe bending machines or hydraulic presses. These tools apply force to the pipe, causing it to deform and take on the desired shape or angle. The ability to bend steel pipes makes them versatile and suitable for various applications, including plumbing, construction, and manufacturing. However, it's important to note that the degree to which a steel pipe can be bent depends on factors such as the pipe's diameter, wall thickness, and the type of steel used.

Q: How are steel pipes repaired in case of damage or leaks?: Steel pipes can be repaired in case of damage or leaks through various methods. One common approach is to use a process called welding. Welding involves melting a filler material together with the damaged or leaking area of the pipe, creating a strong bond that seals the leak. This method is effective for small to moderate-sized leaks and is widely used in industries such as oil and gas, plumbing, and construction. Another method is to use mechanical couplings. These couplings are designed to join two sections of pipe together, providing a tight and secure connection. They can be used to repair damaged or leaking sections of a steel pipe by cutting out the damaged area and replacing it with a new section, which is then connected using the mechanical coupling. This method is particularly useful for larger leaks or damaged sections that cannot be repaired through welding. In some cases, a temporary fix may be applied using pipe clamps or epoxy compounds. Pipe clamps are used to tightly seal the damaged area, preventing further leakage. Epoxy compounds, on the other hand, are applied directly to the damaged or leaking area, creating a seal that temporarily stops the leak until a more permanent repair can be made. It is important to note that the method of repair will depend on the severity and location of the damage or leak, as well as the specific requirements of the application. In some instances, it may be necessary to replace the entire section of the steel pipe if the damage is extensive or if multiple leaks are present. Consulting with a professional or a specialized pipe repair service is recommended to determine the most appropriate repair method for a specific situation.

Q: How are steel pipes used in the transportation of fluids?: Steel pipes are commonly used in the transportation of fluids due to their durability, strength, and corrosion resistance. They are used in various industries, including oil and gas, water supply, and chemical processing, to transport liquids and gases over long distances. The seamless construction of steel pipes ensures a smooth flow of fluids, reducing friction and pressure loss. Additionally, their ability to withstand high temperatures and pressures makes them ideal for transporting fluids safely and efficiently.

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