Product Specification

T5 DOM Steel Tube Drawn Over Mandrel Low Carbon Steel Welded Pipe For Mechanical

This product is a Drawn-Over-Mandrel (DOM) steel tube manufactured from low-carbon welded pipe, designed for demanding mechanical applications requiring high precision, uniform mechanical properties, and excellent surface finish. It is cold-drawn over a mandrel to achieve tight tolerances on outside diameter (OD), inside diameter (ID), and wall thickness, resulting in smooth, oxide-free surfaces and superior concentricity. Typical sizes range from very small ODs for precision hydraulic components up to large ODs suitable for structural shafts, with wall thicknesses optimized for strength-to-weight performance. Below is a detailed breakdown of its material characteristics, specifications, chemical and mechanical properties, main features, applicable standards, and application areas.

Material

T5 DOM steel tubing is produced from low-carbon electric-resistance-welded (ERW) “mother tubes” that are cold-drawn over a mandrel to improve dimensional accuracy and surface quality. The base material is typically ASTM A513 Grade 1020 or 1026, selected for its balance of weldability, machinability, and strength.

Specifications

• Size range (stocked): 3/16″ to 14″ OD; wall thickness from 0.028″ to 0.625″

• Length: Supplied in random lengths of 17′–24′, with cut-to-length service available

• Manufacturing process: Electric-resistance-welded → cold-drawn over mandrel (DOM)

• Grades: Primarily 1020 (OD ≤2″ / wall ≤0.156″) and 1026 (larger or heavier wall)

Chemical Composition

The chemical composition limits for five representative low-carbon DOM grades under ASTM A519 are shown below:

Mechanical Performance

Typical mechanical properties for these five grades in the drawn-over-mandrel condition are:

Main Features

• Tight tolerances: Close OD/ID and wall thickness control for precision components

• Superior surface finish: Smooth, scale-free surfaces ideal for hydraulic and rotating parts

• Uniform mechanical properties: Cold drawing refines grain structure and increases strength

• Excellent machinability: Minimal stock allowance required for secondary machining

• High fatigue resistance: Suitable for cyclic loading in automotive and industrial machinery

Standards

• ASTM A513 Type 5 (DOM mechanical tubing)

• ASTM A519 (cold-finished seamless mechanical tubing)

• EN 10305-3 (cold-drawn precision steel tubes)

• GOST 8734 (cold-drawn welded steel tubes)

• JIS G3446 (cold-drawn steel tubes)

• GB/T 3639 (cold-drawn carbon steel precision tubes)

Application Fields

General Sectors

• Automotive: Shafts, axles, suspension components

• Hydraulics: Cylinder barrels, pistons, bushings

• Industrial Machinery: Gears, bearings, spindles

• Construction: Structural shafts, linkages

Specific Uses

• Hydraulic cylinders: Smooth bore for sealing and rod guidance

• Automotive steering: High concentricity reduces vibration

• Machine spindles: Enhanced fatigue life under cyclic loads

• Precision shafts: Tight tolerances ensure accurate alignment

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.