DOM Steel Pipe (ERW Cold Drawn Mild Steel Round Tube) for Precision Machinery

1. Material

This product—commonly referred to as DOM (Drawn Over Mandrel) tubing—is a high-strength, precision round tube manufactured using a combination of electric resistance welding (ERW) and cold drawing over a mandrel. It’s typically fabricated from mild carbon steel grades such as SAE 1020, 1026, and in some cases ST52.3. 

2. Specifications

• Manufacturing Process: Starts with an ERW "mother tube"; post-weld, the tube is cold-drawn over a mandrel to refine dimensional accuracy, wall thickness, and surface finish. 

• Tolerance & Quality: This yields tight OD/ID control, uniform wall thickness, high concentricity, and weld integrity. 

• Dimension Ranges: Common inventory spans OD 3/16" to 14", with wall thicknesses roughly 0.028" to 0.625". Standard lengths often range between 17–24 ft, with cut‑to‑length options available.

• Standards: Usually made to ASTM A513 Type 5 for mechanical tubing.

3. Chemical Composition

Here are typical chemical compositions for DOM tubing grades, including a comparable alloy (4130) for contrast:

4. Mechanical Properties

Here are mechanical properties from DOM tubing specs and ASTM A513-T5 references:

5. Key Features

• Superior weld integrity combined with cold drawing yields excellent dimensional precision, smooth interior and exterior surfaces, and uniform wall thickness.

• Improved yield and tensile strength, along with good machinability and weldability, thanks to cold-drawn processing. 

6. Standards

• ASTM A513 Type 5 (Mechanical Tubing) is the most common standard applied to domestic DOM tubing production. 

• If produced in different markets, equivalents in EN, GOST, JIS or GB may apply, especially when using ST52.3 or other regional grades (not covered by the sources).

7. Application Domains

General Use: DOM tubing is ideal for machinery and precision engineering contexts thanks to its strength and precision.

Examples per Sector:

• Automotive: Driver steering columns, hydraulic/hydraulic cylinder rods, suspension links. 

• Industrial Equipment & Construction: Machinery shafts, supporting rods, and load-bearing mechanisms. 

• General Engineering: Components requiring tight tolerances—like axles, shafts, pins, and linear motion parts—also benefit from DOM tubing. Features like excellent finish and structural performance reduce downstream machining or finishing costs.

Q: Are you trading company or manufacturer ?

A: manufacturer,also can do trading.

Q: How long is your delivery time?

A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock,

it is according to quantity.

Q: Do you provide samples? is it free or extra ?

A: Yes, we could offer the sample for free charge but need pay the cost of freight.

Q: What is your terms of payment ?

A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.

If you have another question, pls feel free to contact with me.