Seamless black steel pipe API,GB,ASTM,ASME,DIN

Seamless black steel pipe API,GB,ASTM,ASME,DIN

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Loading Port:: Tianjin

Payment Terms:: TT OR LC

Min Order Qty:: 10 m.t.

Supply Capability:: 5000 m.t./month

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1. Commodity Name: Seamless steel pipe

2. Standard: API,GB,ASTM,ASME,DIN

3. Quality grade: 10#, 20#, A106B, A53B, API 5L B, Q235, Q345, ST37-2, ST 45, ST52.etc.

4. Dimension:

OD: 1/2"-24"

WT: 2.5-80mm, SCH10~SCH40~XXL

length: 5.8m,6m,8m,9m,12m

5. Technique: Hot Rolled/Cold Rolled/ Cold Drawn

6. application

carbon seamless steel pipes are widely used in gas, water and oil, transpotation;constructions;Bridge,highway,windows of model steel door; building materials;fences;heating facilities Fluid Pipe;conduit pipe,scaffolding pipe.etc.

7. Payment Terms: L/C D/A D/P T/T

8.packing and shipment

Packaged in bundles,as per customers' requirements, it can also bepackagesd as beveled ends, typed marking, black painting, plastic caps protection,woven bags packing

For 20" container the max length is 5.8m; For 40" container the max length is 12m. other options are available based on customer requests. Please discuss when placing orders.

9. Surface: painted with varnish;

10. Plastic caps at ends.

11. Tolerance: OD +1%/-1%

WT +12.5%/-10%

12. Chemical composition:

Models of Steel Pipes	Chemical Component
Steel 20 (ASTM A106B)	C	Si	Mn	P	S	Cu	Ni	Cr
Steel 20 (ASTM A106B)	0.17~0.24	0.17~0.37	0.35~0.65	0.035max	0.035max	0.25max	0.25max	0.25max
Steel45 (ASTM 1045)	0.42~0.50	0.17~0.37	0.50~0.80	0.035max	0.035max	0.25max	0.25max	0.25max
16Mn(Q345B)	0.12~0.20	0.20~0.55	1.20~1.60	0.035max	0.035max	0.25max	0.25max	0.25max
45Mn2 ( ASTM1345)	0.42~0.49	0.17~0.37	1.40~1.80	0.035max	0.035max	0.3max	0.3max	0.30max

Q:What are the different types of joints used with steel pipes?: There are several types of joints commonly used with steel pipes, depending on the specific application and requirements. Some of the most common types include: 1. Butt Joint: This is the most basic type of joint, where two pipes are aligned and welded together at their ends. It provides a strong and continuous connection but may require additional reinforcement depending on the pipe's size and pressure rating. 2. Socket Weld Joint: In this type of joint, one pipe is inserted into the socket of another pipe and then welded together. It is commonly used in smaller diameter pipes and provides good strength and leak resistance. 3. Threaded Joint: This joint involves screwing together two pipes with threaded ends. It is commonly used in low-pressure applications and requires the use of pipe threads and sealants to ensure a tight and leak-free connection. 4. Flanged Joint: With a flanged joint, two pipes are connected by bolting together flanges at their ends. This type of joint is commonly used in high-pressure applications and allows for easy disconnection and maintenance. 5. Grooved Joint: This joint uses a grooved coupling that is placed around the ends of two pipes and secured with bolts. It is commonly used in fire protection systems and offers quick installation and easy maintenance. 6. Welded Joint: In a welded joint, two pipes are fused together using various welding techniques such as gas tungsten arc welding (GTAW) or gas metal arc welding (GMAW). This joint provides a strong and permanent connection but may require skilled labor and additional equipment. Each type of joint has its advantages and limitations, and the selection depends on factors such as pipe size, pressure rating, application, and installation requirements. It is essential to choose the appropriate joint to ensure the integrity and reliability of the steel pipe system.

Q:Can steel pipes be used for offshore applications?: Yes, steel pipes can be used for offshore applications. Steel pipes are commonly used in offshore industries due to their durability, strength, and resistance to corrosion. Offshore applications such as oil and gas exploration, drilling, production, and transportation of fluids and gases often require the use of steel pipes. These pipes are designed to withstand harsh and corrosive environments found in offshore locations, including exposure to saltwater, extreme temperatures, and high pressure. Additionally, steel pipes can be manufactured to meet specific requirements for offshore projects, including size, thickness, and material grade, to ensure safety and reliability. Overall, steel pipes are a reliable and widely used choice for offshore applications.

Q:Theoretical weight of 25*25*1.5 square steel tubes: Square steel tube, referred to as square tube, also known as square tube, is a square pipe of a kind of name, that is, the length of the same steel pipe. The strip is rolled by process. Generally, the strip is disassembled, leveled, crimped and welded to form a round tube. The tube is then rolled into square tubes and cut to the required length, usually 50 pieces per package.

Q:Can steel pipes be used for geothermal systems?: Yes, steel pipes can be used for geothermal systems. Steel pipes are commonly used in geothermal systems for their high strength, durability, and ability to withstand high temperatures and pressures. They are also resistant to corrosion, making them suitable for long-term use in geothermal applications.

Q:How are steel pipes tested for leaks?: Steel pipes are tested for leaks using various methods, including hydrostatic testing and ultrasonic testing. In hydrostatic testing, the pipes are filled with water or another suitable fluid and subjected to high pressure to check for any leakage. Ultrasonic testing involves using high-frequency sound waves to detect any defects or leaks in the pipes. These testing methods ensure the integrity and reliability of steel pipes.

Q:Where is the difference between seamless steel pipe and welded pipe?: Seamless steel tube is formed during rolling. Welded steel pipes need to be welded after coiling, and spiral welding and direct welding are generally used. Seamless performance is better, of course, the price is higher.

Q:What is the difference between steel pipes and PVC-M pipes?: The main difference between steel pipes and PVC-M pipes lies in their material composition. Steel pipes are made of steel, which gives them higher strength and durability. They are commonly used for high-pressure applications and in areas where the pipes may be exposed to extreme conditions or corrosive substances. On the other hand, PVC-M pipes are made of polyvinyl chloride modified with certain additives to enhance their impact resistance and toughness. They are lightweight, easy to install, and resistant to corrosion, making them suitable for various applications, including water supply, irrigation, and drainage systems. While steel pipes offer superior strength, they are more expensive and require regular maintenance, such as anti-corrosion treatments. PVC-M pipes, on the other hand, are more affordable, require minimal maintenance, and can be easily joined using solvent welding or mechanical fittings. In summary, the choice between steel pipes and PVC-M pipes depends on factors such as the intended use, budget, and environmental conditions.

Q:How do you calculate the flow rate of water in steel pipes?: To calculate the flow rate of water in steel pipes, you can use the equation Q = A × V, where Q represents the flow rate in cubic meters per second, A denotes the cross-sectional area of the pipe in square meters, and V represents the average velocity of the water in meters per second.

Q:How do steel pipes handle water erosion?: Steel pipes are highly resistant to water erosion due to their inherent strength and durability. The smooth surface of steel pipes minimizes friction and turbulence, reducing the likelihood of erosion. Additionally, steel pipes can be coated with protective layers, such as galvanization or epoxy, that further enhance their resistance to water erosion.

Q:How are steel pipes insulated for thermal applications?: Steel pipes are commonly insulated for thermal applications using various materials such as fiberglass, mineral wool, or foam insulation. These insulating materials are typically wrapped around the steel pipes to create a protective barrier that reduces heat transfer. Additionally, a vapor barrier may be installed to prevent moisture condensation. This insulation helps to maintain the desired temperature of the fluid or gas being transported through the pipes and prevents energy loss.

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