St37.4 Equivalent Seamless Cold Drawn Tubes

Dimensions:

• Precision and Accuracy: Cold drawing process ensures high dimensional accuracy, making these tubes ideal for applications requiring precise measurements.
• High Strength: The material used provides good tensile strength, allowing the tubes to withstand high internal and external pressures.
• Seamless Construction: The seamless design eliminates weak spots that may occur in welded tubes, ensuring better performance and reliability in high-pressure environments.
• Smooth Surface Finish: Cold drawing ensures a smooth internal and external surface, reducing friction for fluid flow and enhancing the tube’s resistance to wear and corrosion.

Surface Treatment:

• The tubes are typically coated with anti-corrosion oil to protect against rust during storage and transportation.
• Additional treatments such as acid pickling or phosphating can be applied to enhance corrosion resistance, especially for harsh environments.

1. Piercing: The process begins with piercing a solid steel billet to create a hollow tube.
2. Acid Pickling: The tube undergoes acid pickling to remove impurities, rust, and scale from the surface.
3. Phosphating: The tube may undergo phosphating to enhance corrosion resistance and prepare the surface for further treatments.
4. Cold Drawing: The tube is cold drawn through a die to reduce its diameter and wall thickness, improving its mechanical properties such as strength and hardness.
5. Annealing: The tube may be annealed to remove internal stress caused by the cold working process, ensuring a smooth surface and consistent performance.
6. Optional Cold Rolling: In some cases, cold rolling may follow the cold drawing process to further enhance surface finish and dimensional tolerance.

Applications

• • Hydraulic Systems: Used in various hydraulic applications, such as cylinders, pumps, and power transmission systems, where high-pressure strength and precision are required.
  • Automotive: Employed in automotive hydraulic lines, brake systems, and other mechanical parts where high strength and reliability are essential.
  • Mechanical Engineering: Suitable for applications in machinery and equipment that require precision tubing for fluid transmission and structural support.
  • Pressure Systems: These tubes are ideal for high-pressure systems in industries like oil and gas, aerospace, and manufacturing.