What is Cold Drawn Seamless Pipe?

Cold drawn seamless (CDS) pipe undergoes additional cold working after hot rolling. The drawing process pulls the pipe through dies at room temperature. This process makes the dimensions very precise. The surface finish becomes smooth. It also improves the mechanical properties. This cold work makes the tensile and yield strength higher than what you find in hot rolled metal. The surface has no scale. It works well for any application that needs a clean bore or tight tolerances. Compared to hot rolled pipe, this cold rolled carbon pipe costs more. This is because we add extra steps to the process. We suggest using it for hydraulic and precision tasks where these features are necessary.

Benefits of Cold Drawing

Cold drawn pipe has 5 main benefits that make it better than hot rolled pipes:

  • Tighter Dimensional Tolerances: We pull the metal through precision dies. This controls the OD and ID. It also keeps the wall thickness more exact than hot rolling.
  • Smoother Surface Finish: Cold working gets rid of scale. It creates a clean surface on both the outside and the inside.
  • Improved Tensile Strength: Cold work makes the metal 10-20% stronger than hot rolled versions.
  • Better Concentricity: The drawing process makes the pipe rounder. Wall uniformity is also better.
  • Enhanced Straightness: Cold drawn pipe stays straighter. It beats the straightness levels of hot finished material.

Applications

The cold rolled seamless pipe is found in 2 major industrial applications:

Hydraulic Cylinders

Precision tubes for hydraulic systems require the tight tolerances and smooth bore that cold drawing provides. Cylinder barrels need consistent ID for proper piston seal operation. Our cold rolled steel pipe meets the dimensional accuracy demanded by hydraulic equipment manufacturers.

Mechanical Components

Bushings, rollers, and precision machinery use cold rolled seamless pipe. Its improved surface finish and dimensional control reduce machining requirements. Components like bearing housings, guide tubes, and sleeve bearings benefit from the consistent quality of CDS pipe.