Q235 and Q235B are types of carbon structural steel covered by the Chinese GB/T 700-2006 standard. These grades of steel are known for their excellent properties for applications in general structural uses. Here are some of the key features of pipes made from Q235/Q235B steel:

• Chemical Composition: Q235/Q235B steel has a low carbon content, making it easy to form and weld. It also contains other elements like silicon, copper, nitrogen, chromium, and nickel in small amounts.
• Weldability: The low carbon content of Q235/Q235B steel makes it excellent for welding. It can be used for a variety of welding processes with good results.

Q235/Q235B Carbon Steel Pipe Supplier

• Machinability: Q235/Q235B is generally easy to machine, allowing it to be shaped into various forms, including pipes.
• Ductility: These types of steel have good ductility, which makes them flexible without losing their strength.
• Affordability: Q235/Q235B steel is relatively inexpensive compared to other types of steel, which makes it a popular choice for a wide range of applications.

Q235/Q235B Carbon Steel Pipe Factory in China

Q235/Q235B Carbon Steel Pipe Factory

China Q235/Q235B Carbon Steel Pipe

Carbon Steel Round Tube Stock in China

Q235 and Q235B are common carbon steel grades used in China and have equivalent grades in other countries. The manufacturing technology for Q235/Q235B carbon steel pipes typically involves the following processes:

1. Seamless Manufacturing Process:
   • Piercing: The process begins with a solid round billet of Q235/Q235B carbon steel. The billet is heated to a high temperature and pierced by a mandrel to create a hollow tube.
   • Rolling: The pierced billet is then rolled and elongated on a mandrel mill or a plug mill to reduce its diameter and wall thickness while increasing its length.
   • Sizing: The elongated tube is passed through sizing rolls to achieve the final desired dimensions, ensuring precise outer diameter (OD) and wall thickness.
   • Finishing: The seamless tube undergoes various finishing operations, such as straightening, heat treatment, and inspection to meet the specified requirements.
   • Seamless manufacturing produces Q235/Q235B carbon steel pipes without the need for welding, resulting in pipes with uniform properties, higher strength, and improved corrosion resistance. It is commonly used for smaller diameter pipes and higher-pressure applications.
2. Welded Manufacturing Process:
   • ERW (Electric Resistance Welding): This process involves the formation of a longitudinal seam by passing a high-frequency electric current through the edges of a flat steel strip. The edges are heated and fused together under pressure to form the pipe.
   • SAW (Submerged Arc Welding): SAW process involves welding the edges of two steel plates or strips using a continuously fed electrode. The welding occurs under a layer of flux, protecting the weld from contamination.
   • LSAW (Longitudinal Submerged Arc Welding): LSAW process is used for large-diameter pipes. It involves bending and forming a steel plate into the shape of a pipe and welding the longitudinal seam using the SAW process.
   • HFW (High-Frequency Welding): HFW process utilizes high-frequency electric currents to weld the edges of a strip or plate together to form a pipe.
   • Welded manufacturing is suitable for larger diameter and thicker-walled Q235/Q235B carbon steel pipes. It is commonly used for lower-pressure applications and offers cost advantages over seamless manufacturing.

Q235 and Q235B are common carbon steel grades used in China, with equivalent grades in other countries. Carbon steel pipes made from Q235/Q235B are widely used in various applications across different industries. Here are some common applications of Q235/Q235B carbon steel pipes:

1. General Structural and Engineering Purposes: Q235/Q235B carbon steel pipes are commonly used in general structural and engineering applications. They are employed in the construction of buildings, bridges, infrastructure projects, and other structural components.
2. Oil and Gas Industry: Q235/Q235B 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.
3. Water and Wastewater Systems: Q235/Q235B carbon steel pipes are utilized in water supply and wastewater systems for conveying water, drainage, and sewerage. They are commonly used in municipal, industrial, and agricultural applications.
4. HVAC Systems: Q235/Q235B carbon steel pipes are used in heating, ventilation, and air conditioning (HVAC) systems. They transport hot water, chilled water, and other fluids involved in HVAC applications.
5. Plumbing Systems: Q235/Q235B carbon steel pipes are employed in plumbing systems for residential, commercial, and industrial applications. They are used for water supply lines, drainage systems, and plumbing fixtures.
6. Industrial Applications: Q235/Q235B carbon steel pipes find use in various industrial sectors. They are utilized for conveying fluids, gases, and other media in manufacturing processes, chemical plants, refineries, and power generation facilities.
7. Agricultural Applications: Q235/Q235B carbon steel pipes are used in agricultural applications for irrigation systems, water supply to farms, and the transportation of agricultural products.
8. Mechanical and Structural Engineering: Q235/Q235B carbon steel pipes are employed in mechanical and structural engineering applications. They are used for manufacturing machinery, equipment, and components that require good strength, ductility, and weldability.

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.