seamless steel tubes for construction System 1

seamless steel tubes for construction

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Loading Port:: Shanghai

Payment Terms:: TT OR LC

Min Order Qty:: 2000 m.t.

Supply Capability:: 10000 m.t./month

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Product Description:

Standards：
GB，_r81 62 Chinese national standard
ASTM A53 Standard of American Society of Testing Materials
ASME SA53 Boiler and pressure vessel--c-Ojrde of ASME
Application：
Seamless steel tubes for manufacturing pipelines。vessels，equipment and mechanical structures
Models of major steeI tubes：
1 O，20，35、45，Q345，1 5CrMo，1 2Crl MoV,A53A，A53B，SA53A，SA53B, 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/T8162	10	≥335	≥205	≥24
	20	≥390	≥245	≥20
	35	≥510	≥305	≥17
	45	≥590	≥335	≥14
	Q345	≥490	≥325	≥21
	15CrMo	≥440	≥295	≥22
	12Cr1MoV	≥490	≥245	≥22
ASTM A53 ASME SA53	A	≥330	≥205	Check the table in ASTM A 53 Check the table in ASME SA53
ASTM A53 ASME SA53	B	≥415	≥240	Check the table in ASTM A 53 Check the table in ASME SA53

Chemical composition:

Standard codes	Models of steel tubes	Chemical compositions（％）
Standard codes	Models of steel tubes	C	Si	Mn	P	S	Cu	Ni	Mo	Cr	V
GB/T8162	10	0.07～0.14	0.17～0.37	0.35～0.65	≤0.035	≤0.035	≤0.25	≤0.25	/	≤0.15	/
	20	0.17～0.24	0.17～0.37	0.35～0.65	≤0.035	≤0.035	≤0.25	≤0.25	/	≤0.25	/
	35	0.32～0.40	0.17～0.37	0.50～0.80	≤0.035	≤0.035	≤0.25	≤0.25	/	≤0.25	/
	45	0.42～0.50	0.17～0.37	0.50～0.80	≤0.035	≤0.035	≤0.25	≤0.25	/	≤0.25	/
	Q345	0.12～0.20	0.20～0.55	1.20～1.60	≤0.035	≤0.035	≤0.25	≤0.25	/	≤0.25	/
	15CrMo	0.12～0.18	0.17～0.37	0.40～0.70	≤0.035	≤0.035	≤0.25	≤0.30	0.40～0.55	0.80～1.10	/
	12Cr1MoV	0.08～0.15	0.17～0.37	0.40～0.70	≤0.035	≤0.035	≤0.25	≤0.30	0.25～0.35	0.90～1.20	0.15～0.30
ASTMA53 ASMESA53	A	≤0.25	/	≤0.95	≤0.05	≤0.06	≤0.40	≤0.40	≤0.15	≤0.40	≤0.08
ASTMA53 ASMESA53	B	≤0.30	/	≤1.20	≤0.05	≤0.06	≤0.40	≤0.40	≤0.15	≤0.40	≤0.08

Q: What are the different types of steel pipe coatings for underground applications?: The different types of steel pipe coatings for underground applications include fusion bonded epoxy (FBE), polyethylene (PE), polyurethane (PU), and coal tar enamel (CTE).

Q: What are the different methods of coating steel pipes for insulation?: Insulating steel pipes can be achieved through various methods, each with its own pros and cons. 1. One method involves applying a layer of thermal insulation material, like mineral wool or foam, onto the steel pipes. This helps minimize heat transfer and energy loss. While these coatings are easy to apply and offer excellent insulation properties, they are prone to degradation over time and require regular maintenance and replacement. 2. Another approach is to coat the steel pipes with materials that protect against corrosion, such as epoxy or polyethylene. These coatings act as a barrier, shielding the pipes from moisture, chemicals, and other corrosive elements. They are durable and long-lasting, providing effective protection. However, they may not offer significant thermal insulation. 3. Fusion-bonded epoxy (FBE) coating is a popular method that combines both insulation and corrosion protection. It involves applying a layer of epoxy powder to the pipes and heating it to create a strong bond. FBE coatings offer excellent adhesion, corrosion resistance, and some thermal insulation properties. They are commonly used in oil and gas pipelines, enduring harsh environments and high temperatures. 4. Polyurethane foam is often used as an insulation coating for steel pipes. It is applied by spraying or injecting the foam onto the pipe surface, where it expands and hardens, forming a protective layer. Polyurethane foam coatings provide exceptional thermal insulation and can be applied to pipes of different shapes and sizes. However, they require specialized equipment and expertise and may be susceptible to physical damage or moisture absorption if not properly sealed. 5. Ceramic coatings offer yet another option for insulating steel pipes. These coatings are typically applied through a thermal spray process, creating a layer of ceramic material on the pipe surface. Ceramic coatings provide insulation against high temperatures, corrosion resistance, and thermal shock protection. They are commonly used in industries like power generation and aerospace, where extreme temperature conditions are present. However, ceramic coatings can be costly and require specialized equipment and expertise for application.

Q: Can steel pipes be used for underground sprinkler systems?: Indeed, underground sprinkler systems can utilize steel pipes. Renowned for their durability and strength, steel pipes prove to be a fitting choice for underground applications. Their resistance to corrosion and ability to withstand high pressure and temperature render them suitable for conveying water to sprinkler heads. Nonetheless, it is crucial to acknowledge that steel pipes may necessitate supplementary coatings or protective measures to prevent rusting and corrosion in the long run. Moreover, the cost factor should be taken into account as steel pipes may be pricier compared to alternative materials like PVC or polyethylene. All in all, steel pipes can serve as a feasible option for underground sprinkler systems, particularly in regions with more severe environmental conditions.

Q: How are steel pipes tested for leaks?: Steel pipes can be tested for leaks using various methods, including hydrostatic testing, pneumatic testing, and using leak detection equipment such as ultrasonic testing or helium testing.

Q: Can steel pipes be used for underground sewage systems?: Yes, steel pipes can be used for underground sewage systems. Steel pipes are known for their durability and strength, making them suitable for underground applications. However, it is essential to ensure that the steel pipes are properly coated or protected against corrosion to prevent damage from sewage and soil conditions.

Q: How are steel pipes used in the manufacturing of renewable energy systems?: Steel pipes are widely used in the manufacturing of renewable energy systems due to their durability, strength, and versatility. They are primarily used in the construction of wind turbines, solar panel frames, and the transmission of geothermal energy. Steel pipes provide the necessary structural support and stability required for these systems, ensuring their long-term functionality and reliability. Additionally, steel pipes are often used for transporting and distributing renewable energy sources, such as natural gas and hydrogen, further contributing to the overall efficiency and sustainability of these systems.

Q: Can steel pipes be used for stormwater management systems?: Yes, steel pipes can be used for stormwater management systems. Steel pipes are a commonly used material for stormwater management due to their durability, strength, and resistance to corrosion. They can effectively carry and transport stormwater, making them suitable for various applications in stormwater management systems.

Q: Can steel pipes be used for firefighting systems?: Yes, steel pipes can be used for firefighting systems. Steel pipes are commonly used for their durability and resistance to high temperatures, making them suitable for transporting water and other fire suppression agents. They are typically used in larger commercial or industrial buildings where the fire protection system requires a higher flow rate and pressure. Steel pipes also have the advantage of being able to withstand external forces and impacts, ensuring the integrity of the firefighting system. Additionally, steel pipes can be easily connected, making them convenient for installation and maintenance purposes. However, it is important to ensure that the steel pipes used for firefighting systems are properly treated to prevent corrosion and rusting, as this can compromise their effectiveness in an emergency situation. Regular inspections and maintenance should be conducted to ensure the reliability and functionality of the steel pipes within the firefighting system.

Q: What is the difference between schedule 10 and schedule 40 steel pipes?: Schedule 10 and schedule 40 steel pipes find common usage in various industries for different purposes, differing in their wall thickness and pressure ratings. When it comes to wall thickness, schedule 10 pipes possess a slimmer wall in comparison to schedule 40 pipes. This attribute results in schedule 10 pipes having a smaller internal diameter and the ability to withstand lower pressure compared to schedule 40 pipes. While schedule 10 pipes typically have a wall thickness of 0.109 inches, schedule 40 pipes boast a wall thickness of 0.154 inches. The thinner walls of schedule 10 pipes make them ideal for applications with low pressure, such as domestic water supply, drainage systems, and general plumbing. Additionally, they are frequently employed in lightweight structures or where weight is a significant concern. On the other hand, schedule 40 pipes are specifically designed to handle higher pressure and are commonly utilized in industrial settings. These pipes are often found in applications such as oil and gas pipelines, chemical processing plants, and high-pressure fluid systems. The thicker walls of schedule 40 pipes provide them with enhanced strength and durability, enabling them to withstand higher pressure and stress. To summarize, the primary distinction between schedule 10 and schedule 40 steel pipes lies in their wall thickness and pressure ratings. Schedule 10 pipes have a thinner wall and are suitable for low-pressure applications, while schedule 40 pipes possess a thicker wall and can withstand higher pressure. It is crucial to select the appropriate schedule based on the specific requirements and pressure limitations of the intended application.

Q: How are steel pipes classified based on their thickness?: Steel pipes can be classified based on their thickness into three main categories: Schedule, Nominal Pipe Size (NPS), and Wall Thickness. The Schedule classification is commonly used in North America and refers to the wall thickness of the pipe. It is denoted by numbers such as Schedule 10, Schedule 40, and Schedule 80, where the higher the number, the thicker the pipe. The Nominal Pipe Size (NPS) classification, on the other hand, is used internationally and refers to the inside diameter of the pipe. It is expressed in inches and is usually followed by a schedule number to indicate the wall thickness. For instance, NPS 6 Schedule 40 means a pipe with a 6-inch inside diameter and a wall thickness according to Schedule 40. Lastly, steel pipes can also be classified based on their wall thickness in millimeters or inches. This classification provides a more precise measurement of the pipe's thickness, usually referred to as the "wall thickness" or "wt" in specifications. The wall thickness is measured from the outside diameter to the inside diameter and can be expressed in various units of measurement, such as millimeters, inches, or gauge. In conclusion, steel pipes are classified based on their thickness using different systems such as Schedule, Nominal Pipe Size (NPS), and Wall Thickness. These classifications help ensure that the appropriate pipe is selected for specific applications, considering factors such as pressure requirements, structural integrity, and compatibility with other components of the system.

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