Black Round Carbon Steel Welded Pipes, commonly produced using Electric Resistance Welding (ERW) or other welding techniques, have several significant features:

• Durable and Versatile: Carbon steel is known for its durability and strength, making it an ideal material for pipes that need to withstand various environmental conditions. It can be used in a wide variety of applications including plumbing, HVAC, fire sprinkler systems, or gas lines.

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• Corrosion Resistance: The black iron oxide coating, known as mill scale, formed during the hot fabrication process, provides a certain level of resistance to corrosion. However, for environments with high corrosion potential, additional treatments or coatings may be applied.
• Round Shape: The round shape provides uniform strength around the entire circumference of the pipe and allows for efficient fluid flow with less resistance.

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• High Strength: The welded seam, especially in ERW pipes, often becomes the strongest part of the pipe due to the heat treatment during the welding process.
• Economical: Black round carbon steel welded pipes are often more cost-effective compared to other types of pipes. Their durability and strength combined with lower cost make them a popular choice for many industries.

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• Size Variety: These pipes are available in a wide variety of sizes and wall thicknesses, making them adaptable to the needs of different applications.
• Ease of Installation: They are easy to install and connect with other components, often requiring standard fittings and joining methods.

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• Heat Resistance: Carbon steel pipes can withstand high temperatures, making them suitable for applications such as steam and heat transfer systems.

Manufacturing black round carbon steel welded pipe typically follows the Electric Resistance Welding (ERW) method. The “black” refers to the black iron oxide scale that covers the steel, providing a degree of corrosion resistance. Here are the general steps involved in the manufacturing process:

1. Coil Selection: The process starts with the selection of a hot-rolled steel coil, the quality, thickness and grade of which depends on the requirements of the end product.
2. Uncoiling: The steel coil is then uncoiled and passed through a series of rollers to flatten it. This flat sheet is called a “skelp”.
3. Slitting: The skelp is then slit into precise widths based on the size/diameter of the pipes to be produced.
4. Forming: The skelp is gradually shaped into a round tube through a series of contoured rollers. The two edges of the skelp meet to form an open seam.
5. Welding: The edges of the tube are then heated using an electric current, and pressure is applied to forge the edges together, creating a weld. The method is known as electric resistance welding (ERW). It is common to weld along the inside and outside to ensure the weld’s strength.
6. Cooling and Cleaning: The welded tube is then cooled and any external weld flash is removed.
7. Cutting and End Finishing: After cooling, the welded pipe is cut into the required lengths and the ends are finished according to the requirements (beveled, threaded, coupled, etc.).
8. Inspection and Testing: The pipe undergoes several tests and inspections to check for defects and to ensure the pipe meets the required specifications. Common tests include visual inspection, hydrostatic testing, and ultrasonic testing.
9. Coating: A protective layer, often referred to as “black” due to the presence of iron oxide, is applied to protect the pipe from corrosion.
10. Marking and Shipping: Finally, the pipe is marked with relevant information (e.g., heat number, size, material grade, manufacturer’s name, etc.) and prepared for shipping.

Black round carbon steel welded pipes have a wide range of applications across various industries due to their durability, strength, and cost-effectiveness. Some common applications of these pipes include:

1. Plumbing and Water Distribution: Carbon steel pipes are commonly used for plumbing and water distribution systems in residential, commercial, and industrial buildings. They are suitable for conveying potable water, as well as hot and cold water.
2. HVAC Systems: Carbon steel pipes are extensively used in heating, ventilation, and air conditioning (HVAC) systems for the distribution of hot and cold air. These pipes can withstand high temperatures and provide efficient airflow.
3. Oil and Gas Industry: Carbon steel welded pipes are widely used in the oil and gas industry for the transportation of crude oil, natural gas, and petroleum products. They are known for their high strength and resistance to corrosion, making them suitable for long-distance pipelines.
4. Construction and Infrastructure: Carbon steel pipes are commonly employed in the construction industry for various applications, such as structural support, piling, and scaffolding. They are also used in the infrastructure sector for bridges, highways, and underground utilities.
5. Industrial Processes: Carbon steel welded pipes find applications in various industrial processes, such as power generation, chemical processing, and manufacturing. They are used for conveying fluids, gases, and steam in these environments.
6. Mechanical and Structural Applications: These pipes are used in the fabrication of mechanical components, machinery, and equipment. They are also employed in structural applications, including the construction of frames, supports, and frameworks.
7. Water Wells and Irrigation Systems: Carbon steel welded pipes are used in the construction of water wells and irrigation systems to transport water from the source to the desired locations.

It’s important to note that the specific application of black round carbon steel welded pipes can vary based on factors such as pipe diameter, wall thickness, and the specific requirements of the industry or project.

The packaging of welded carbon steel pipes is crucial to ensure their protection during transportation and storage. Proper packaging helps to prevent any damage to the pipes, such as dents, scratches, or rust. Below are some of the common packaging methods for welded carbon steel pipes:

• Bundling: Pipes are often bundled together with metal straps for easy handling and transport. This is usually done for smaller diameter pipes.
• Plastic Caps: The ends of the pipes are typically protected with plastic caps to prevent ingress of foreign material and damage to the pipe ends.
• Wrapping: Pipes may be wrapped in a protective material such as plastic or a specialized anti-corrosive film, particularly for long-distance transport or if the pipes are going to be stored outside for an extended period.

• Crating or Palletizing: For overseas shipping or long distance transportation, pipes are often placed on wooden pallets or in wooden crates to protect them during transport.

• Marking: Each pipe, bundle, or crate is usually marked with the necessary information, such as size, grade, heat number, manufacturer’s name or logo, and any other relevant information for identification and traceability.

• Pipe Length: Pipes are often supplied in “single random length” or “double random length”. A single random length pipe means that the pipe is supplied with a length that can vary within certain limits, while a double random length pipe has a length that is twice as long and can vary within certain limits.