Cold drawn erw pipe

Cold drawn erw pipe (CEW), which is one of the best choices for the production of multi-stage hydraulic cylinders. Its process is the same as that of precision seamless pipe cold drawing. It is precision drawn by precision resistance welding (ERW) and manufactured with EN. 10305-2 EU mechanical cold drawn carbon steel welded pipe standard. 

The Cold drawn ERW pipes are used in various applications requiring, high precision dimensional tolerances, better surface finish, high tensile properties and can be produced in ‘non standard’ sizes upon request.

What is CEW？
CEW is a welding process type. CEW stands for Cold Electric Welding. This method uses electricity to weld metals together.
Similar to CFS, this product starts as a welded tube and is subsequently cold drawn.
The range is available in diameters from 6.35mm to 127.0mm.

After the electric resistance welded pipe is welded, the whole pipe body is normalized to ensure the homogeneity of the weld and the heat affected zone with the rest of the metallographic structure and mechanical properties; cold drawing and subsequent heat treatment (eliminating internal stress) and the steel pipe have good dimensions. And mechanical properties.

After the welded steel pipe is processed by cold drawing and deep processing, a high-quality steel pipe with small dimensional tolerance and good mechanical properties is obtained.

In addition, cold drawn welded pipes have significant advantages over cold drawn seamless pipes in terms of initial cost and reduced machine tool processing costs.

What is DOM pipe?

DOM (Drawn Over Mandrel) refers to a production process.

To produce specialty tubing, this procedure uses a drawbench to pull tubing through a die and over a mandrel, allowing excellent control of the inside diameter and wall thickness.

Drawn Over Mandrel (DOM) Round Mechanical Tubing is a cold drawn 1020/1026 electric resistance welded tube with all the flash removed prior to cold drawing. In comparison to other tubing, DOM round steel tubing is produced to more exact OD and ID tolerances, and has the highest weld strength possible.
The DOM tube is a precision steel tube made of ERW steel pipe as raw material and processed by cold drawing.

Tips: In case ASTM A53 Grade B in ERW (electric resistance welded) pipe, the weld seam shall be done the heat treatment with a minimum 1000°F [540°C]. In this way the no untempered martensite remains.
In case ASTM A53 B pipe in cold expanded, then expansion should not exceed 1.5% of the required OD.

Read more: Carbon steel ERW pipe specification or Cold Drawn Seamless Tube for Mechanical & Hydraulic