Cold Drawn Seamless (CDS) seamless tube and pipe is produced by piercing hot billets and subsequent rolling which reduces their diameter and elongates them. This material is then passed through a die and over a mandrel plug to produce an accurate size and gauge which is the essence of the cold drawing process.
What is the difference between Dom and CDSM?
We often get many questions surrounding the differences between Drawn Over Mandrel Tubing and Cold Drawn Seamless (CDS) Tubing. Both types of cold drawn tubing have close tolerances which results in greater size accuracy. Although, one of the major differences is that DOM is a welded tube while CDS is seamless.
The Cold-Drawn Seamless Mechanical Tube
The seamless tubeis manufactured using a process called “extrusion”. During this process a solid steel bar is drilled although the center using a die, rotating the round solid in a round tube. Seamless precision Mechanical tubes boast excellent surface integrity and finish, precision tolerances inner diameter and size and control geometry cannot be achieved at higher cutting speeds.
There are basically two types of seamless tube: Seamless Drawn Cold (CDS), another is Hot Transparent Finish (HFS), which typically madeASTM A519 1026, with less critical tolerances and a flake finish.
Seamless cold drawn normally made ofA519 ASTM 1018, with precise tolerances and good surface finish.
In the cold drawing process, a hot finished seamless tube is used as the mother material, the mother tube, after pre-treatment, is cold drawn by the drawing bench of specified dimensions, as shown in the following diagram.the processed tube is subjected to the final heat treatment based on it has intended final use and then sent to the finishing process and inspection.
Both them are welded steel pipe,What’s the difference?
- DOM tubing is a very effective tubing due to the cold working process,it has Superior Surface Finish than CDW tubing.
- DOM tubing has Closer tolerances on O.D, I.D size, wall thickness and concentricity.
- DOM is more expensive than CDW and less expensive than CDS (cold drawn seamless )tubing.It’s a lower cost alternative to CDS with equal or superior physical properties.