Q345 is a low-alloy steel grade widely used in China that is comparable to the ASTM A572 grade 50 in the United States. It is often used as a structural steel material for various applications, including carbon steel pipes. Here are some key features associated with Q345 carbon steel pipes:

1. Low-Alloy Composition: Q345 carbon steel pipes are characterized by their low alloy composition, which includes elements such as manganese (Mn), silicon (Si), and sometimes a small amount of other alloying elements like phosphorus (P) and sulfur (S). The alloying elements contribute to the enhanced mechanical properties of Q345, such as increased strength and improved toughness.
2. High Strength: Q345 carbon steel pipes offer high strength compared to plain carbon steels. The minimum yield strength of Q345 is 345 MPa (megapascals), hence the name “Q345.” This high strength makes Q345 pipes suitable for structural applications where the material needs to withstand significant loads and stresses.

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• Good Weldability: Q345 carbon steel pipes exhibit good weldability, allowing them to be easily welded using common welding methods like arc welding, MIG welding, and TIG welding. However, it is important to follow appropriate welding procedures and techniques to ensure strong and reliable weld joints.
• Versatility: Q345 carbon steel pipes are versatile and find application in various industries and sectors, including construction, infrastructure, oil and gas, and mechanical engineering. They are commonly used for pipelines, structural supports, bridges, machinery components, and other structural applications.

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• Ductility and Toughness: Q345 carbon steel pipes possess good ductility and toughness, which allows them to withstand bending, deformation, and impact without failure. This property is essential in structural applications where the material may experience dynamic loads or seismic events.
• Corrosion Resistance: Q345 carbon steel pipes are not specifically designed for corrosion resistance. However, they can be protected from corrosion by applying suitable coatings, such as paint, or implementing corrosion prevention measures, including regular maintenance and the use of corrosion inhibitors.

Q345 Carbon Steel Pipe Factory

China Q345 Carbon Steel Pipe

Carbon Steel Round Tube Stock in China

Q345 is a low-alloy steel grade widely used in China that is comparable to the ASTM A572 grade 50 in the United States. The manufacturing technology for Q345 carbon steel pipes typically involves the following processes:

1. Steel Strip Preparation:
   • Hot Rolled Coils: The process begins with the production of hot-rolled steel coils. These coils are produced through the hot rolling of steel slabs.
   • Slitting: The hot-rolled coils are slit into narrower strips of the desired width, which will be used to form the tubes.
2. Cold Forming:
   • Forming: The slitted steel strips are passed through a series of forming rolls or a cold-forming machine, where they are shaped into a tube form. The process involves bending and shaping the strip to create the desired round, square, or rectangular shape.
   • Welding: The edges of the formed strip are then joined together through various welding methods, such as electric resistance welding (ERW), submerged arc welding (SAW), or high-frequency induction welding (HFW). These welding processes fuse the edges together to form a continuous seam along the length of the tube.
   • Heat Treatment: The welded tube may undergo a heat treatment process, such as annealing, to relieve internal stresses and improve its mechanical properties.
   • Sizing and Straightening: The welded tube is passed through sizing rolls to achieve the final desired dimensions, ensuring precise outer diameter (OD), wall thickness, and straightness.
   • Finishing: The tube undergoes various finishing operations, including cutting to the required lengths, inspection, and surface treatment (e.g., cleaning, coating, or painting) to meet the specified requirements.

Q345 is a low-alloy steel grade widely used in China that is comparable to the ASTM A572 grade 50 in the United States. Carbon steel pipes made from Q345 are commonly used in various applications across different industries. Here are some common applications of Q345 carbon steel pipes:

1. Oil and Gas Industry: Q345 carbon steel pipes find extensive use in the oil and gas industry. They are employed for the transportation of crude oil, natural gas, and refined petroleum products in pipelines and other related systems.
2. Water and Wastewater Systems: Q345 carbon steel pipes are commonly used in water supply and wastewater systems. They are employed for conveying water, drainage, and sewerage in municipal, industrial, and agricultural applications.
3. Construction: Q345 carbon steel pipes find application in the construction industry for structural purposes. They are employed in the construction of buildings, bridges, infrastructure projects, and other structural elements.
4. Mechanical and Structural Engineering: Q345 carbon steel pipes are used in mechanical and structural engineering applications. They are employed in the manufacturing of machinery, equipment, and components that require good strength and toughness.
5. Automotive Industry: Q345 carbon steel pipes are utilized in the automotive industry for various applications. They are used in the manufacturing of components such as chassis, frames, and suspension systems that require high strength and durability.
6. Machinery and Equipment: Q345 carbon steel pipes find application in the manufacturing of machinery and equipment. They are employed in the construction of machine frames, gears, shafts, and other components that require good strength and toughness.
7. Agricultural Applications: Q345 carbon steel pipes are used in the agricultural industry for applications such as irrigation systems, water supply to farms, and the transportation of agricultural products.
8. Structural Engineering: Q345 carbon steel pipes find use in structural engineering applications, including the construction of towers, transmission line structures, and other infrastructure projects.

Packaging for  carbon steel tube pipe must protect the product during transportation and storage, keeping them free from physical damage and environmental factors that could lead to rust or corrosion. Here are some common packaging methods:

• Bundling: The tubes are often bundled together, with steel straps or wires securing them. Each bundle is usually of the same size and length to aid in transportation and handling.
• End Protection: The ends of the tubes are often protected with plastic caps or metal bevel protectors. This helps to prevent any damage to the tube ends and keep out dirt and other contaminants.

• Wrapping: Bundles may be wrapped in a protective material such as waterproof paper, plastic sheeting, or a protective cloth. This helps to protect the tubes from environmental factors such as water and dust.
• Crating: In some cases, particularly for long-distance transportation or if the tubes are being shipped internationally, the bundles may be placed in wooden crates or boxes. This provides additional protection.

• • Marking: Each bundle or tube is marked with information like the manufacturer’s name, product specification, size, length, heat number, and other relevant details. This helps in identification and traceability.

• Anti-Corrosion Measures: If the tubes are not already treated for corrosion resistance, they may be coated in oil or another anti-corrosion agent before packaging.

These are general methods and the exact packaging will depend on the supplier, the requirements of the customer, and the intended method of transport. Regardless of the specific packaging used, the goal is to protect the tubes and ensure they arrive at their destination in the best possible condition.