ASTM A513 Type 5 Drawn-Over-Mandrel (DOM) Carbon Steel Mechanical Tubing

1. Material Overview

ASTM A513 Type 5 designates electric-resistance-welded (ERW) carbon steel tubing that undergoes a Drawn-Over-Mandrel (DOM) process. This cold-drawing ensures close control of dimensions—tight outside/inside diameter and wall thickness tolerances—uniform concentricity, dense surfaces, and predictable mechanical strength. It’s widely used for precision mechanical parts including hydraulic cylinders, shafts, roll cages, and similar applications.

2. Specifications

• Grades: Commonly manufactured in Grade 1020 and 1026 carbon steel.

• Forms: Available in round, square, rectangular, and special shapes.

• Size Range:

  • Outside diameter: approximately 0.188″ to 12″ (4.8 mm to 305 mm)

  • Wall thickness: approximately 0.028″ to 0.625″ (0.7 mm to 15.9 mm)

  • Stock lengths: typically 17′ to 24′ (5.2 m to 7.3 m)

3. Chemical Composition & Mechanical Properties

Below is a comparison of five similar grades under ASTM A513 DOM (Type 5) process:

4. Key Features

• Dimensional Precision: DOM tubing offers tight OD/ID/wall tolerances and excellent concentricity.

• Superior Surface Finish: The cold-drawn process yields dense and smooth interior and exterior surfaces.

• Enhanced Mechanical Strength: Cold working improves yield and tensile strength notably compared to standard ERW tubing.

• Excellent Machinability: The fine surface finish and structural uniformity reduce machining needs and improve workability.

5. Applicable Standards

• ASTM A513/A513M — Covers carbon and alloy ERW mechanical tubing, including Type 5 (Drawn-Over-Mandrel). It applies to hot- or cold-rolled steel tubes with specified dimension ranges.

• ASTM A513 Type 5 — Specifically defines the DOM process under A513.

6. Application Fields

General Sectors

Widely used across automotive, appliance, construction, industrial machinery, agriculture, fluid handling, oil & gas, and energy industries.

Specific Uses Within Automotive & Mechanical Contexts

• Hydraulic Components: Cylinders, plungers, shafts

• Automotive & Transport: Axles, roll-cage tubing, chassis struts, camshaft tubes, steering components, shock absorber parts

• General Engineering: Shafts, rollers, telescoping members, structural frames, and machinable components

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