Electric Resistance Welded (ERW) Carbon Steel Rectangular Pipes are created by welding together sheets or strips of carbon steel using electric resistance. These pipes are popular in various industries due to their strength, durability, and versatility. Here are some key features of ERW carbon steel rectangular pipes:

1. Efficient Production: The ERW process is efficient and can be done at high speeds, making these pipes generally less expensive and more readily available than seamless pipes.
2. High Strength: Carbon steel is known for its high strength, and these pipes can withstand significant pressure and heavy loads, making them suitable for a variety of applications.

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• Weldability: The ERW process results in a strong weld that can withstand high pressure. The welded seam is generally as strong or stronger than the rest of the pipe.
• Versatility: ERW carbon steel rectangular pipes are used in a wide range of applications, including construction, oil & gas, automotive, furniture, and machinery parts, due to their strength and ease of fabrication.

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• Dimensional Accuracy: ERW pipes are typically manufactured with high dimensional accuracy, ensuring a precise fit for various applications.
• Cost-Effective: ERW pipes are generally less expensive than seamless pipes, providing a balance of good physical properties and cost.

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• Durability: Despite their welded seams, ERW pipes are quite durable and have a long service life, especially when properly maintained or treated to prevent corrosion.
• Rectangular Shape: The rectangular shape provides structural advantages, such as increased strength in specific directions depending on orientation. This shape can also provide efficient use of space in certain applications.
• Recyclable: Like all steel products, ERW carbon steel is recyclable, contributing to its cost-effectiveness and making it an environmentally friendly choice.

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Electric Resistance Welded (ERW) carbon steel rectangular pipes are made through a series of manufacturing processes. Here’s a general sequence of steps that are involved:

1. Coil Preparation: The process begins with a coil of carbon steel strip. This coil is inspected and prepared for processing.
2. Uncoiling and Leveling: The coil is uncoiled and sent through a leveler, which straightens the coil and removes any distortions.
3. Slitting: The leveled coil is slit to the correct width for the desired size of the pipe.
4. Forming: The slit strip is then passed through a series of roll-forming stands that progressively shape it into a rectangular tube shape.
5. Welding: The edges of the tube are brought together, and an electric current is passed through them. The resistance to this current in the steel heats the edges until they can be fused together, forming a strong, continuous seam along the length of the pipe. This process is known as Electric Resistance Welding (ERW).
6. Cooling: After welding, the pipe is cooled, often by water or air.
7. Sizing: The cooled pipe is then passed through a series of sizing stands to bring it to the correct dimensions.
8. Cutting: The pipe is then cut into the desired lengths.
9. End Finishing: The ends of the pipe can be finished as needed, such as by threading or bevelling.
10. Inspection: The pipes are inspected to ensure they meet the correct specifications and quality standards. This may include visual inspections, as well as non-destructive testing methods such as ultrasonic testing or eddy current testing.
11. Coating: If required, the pipes may be coated for additional corrosion resistance.
12. Packing and Shipping: Finally, the pipes are bundled together and prepared for shipping to their destination.

ERW (Electric Resistance Welded) Carbon Steel Rectangular Pipes are primarily used in various sectors due to their strength, durability, and ability to withstand high pressures and temperatures. Here are a few common applications:

1. Construction and Infrastructure: ERW carbon steel rectangular pipes are often used in construction due to their structural strength. They can be utilized in buildings, bridges, and infrastructure projects like roads and highways, and in scaffoldings where structural integrity is paramount.
2. Industrial Applications: They are used in industries such as chemical, oil and gas, and power plants, where they can be used to transport fluids, gases, and in some cases, granular materials. These industries often require pipes that can withstand high pressures and temperatures, and ERW carbon steel pipes fit the bill.
3. Automotive Industry: ERW carbon steel rectangular pipes are used in the automotive industry for manufacturing of various parts, including frames, roll cages, and exhaust systems due to their strength and ability to withstand heat.
4. Furniture Industry: Due to their aesthetic appeal, these pipes are also used in furniture manufacturing. The pipes can be used to create a variety of furniture pieces, from tables and chairs to bed frames.
5. Transportation: These pipes can be used in the manufacturing of various transportation equipment, including rail cars, trucks, and ships.
6. Mechanical and General Engineering Purposes: ERW pipes are suitable for mechanical applications, including parts for machinery and other equipment.
7. Agriculture: In the agricultural sector, these pipes can be used for irrigation, greenhouses, and other farming structures.

Packaging for carbon steel rectangular pipes usually depends on the length, quantity, and the requirements of the customer. The main goal of packaging is to protect the product during storage and transportation, ensuring it reaches the customer in the best possible condition.

• Bundling: The most common method for packaging is bundling, where multiple steel pipes are bound together using steel straps. Depending on the length and size of the pipes, the number in each bundle can vary.
• Wrapping: After bundling, the steel pipes can be wrapped in a plastic or waterproof paper to protect against rust and other environmental damage. This is particularly important for carbon steel, which can corrode easily if not properly protected.

• Crating: For especially large or heavy pipes, or for long-distance shipping, wooden or steel crates can be used to provide additional protection. Crating can prevent damage during loading, unloading, and transportation.
• End Protection: Caps can be placed on the ends of the pipes to protect them from damage and to prevent foreign objects from entering the pipe. This is especially important for threaded or beveled ends, which can be more susceptible to damage.

• Marking: Each bundle or crate is typically marked with identifying information, such as the size, grade, heat number, manufacturer’s name or logo, and any other information required by the customer or by shipping regulations.