Product Parameters
Drawn Over Mandrel Thin Wall Steel Tube Steel Tubing
Material
Drawn over mandrel (DOM) thin wall steel tubes are made from high-quality steel, which is cold-drawn over a mandrel to create a tube with a high level of precision, strength, and smooth internal surface. This process gives the tubing uniform dimensions and excellent concentricity.
Specification
DOM steel tubing is often specified for applications requiring tight tolerances, high strength, and excellent surface quality. The specifications can vary, but common specifications include:
Wall Thickness: Typically ranging from 0.035 inches to 0.5 inches.
Outside Diameter: Ranging from 0.125 inches to 8 inches.
Length: Customizable according to requirements.
Key Features
High Precision: Accurate dimensions with tight tolerances.
Smooth Surface: Both internally and externally.
Increased Strength: Due to cold drawing and work hardening.
Excellent Concentricity: Ensures even distribution of stress.
Good Weldability: Can be welded with minimal distortion.
Chemical Composition
Here is a typical chemical composition for DOM steel tubing:
| Element | Composition (%) |
| Carbon | 0.10 - 0.25 |
| Manganese | 0.30 - 1.00 |
| Phosphorus | ≤ 0.040 |
| Sulfur | ≤ 0.050 |
| Silicon | 0.10 - 0.50 |
| Copper | ≤ 0.20 |
Mechanical Properties
The mechanical properties of DOM steel tubing vary with the grade and treatment but generally offer high strength and durability. Here's an example of the mechanical properties:
| Property | Value |
| Tensile Strength | 80,000 psi |
| Yield Strength | 60,000 psi |
| Elongation | 15% |
| Hardness | 90-100 HRB |
Physical Properties
The physical properties of DOM steel tubing are significant for various applications:
| Property | Value |
| Density | 7.85 g/cm³ |
| Melting Point | 1371°C |
| Thermal Conductivity | 51 W/mK |
| Electrical Resistivity | 0.6 μΩm |
Process Performance
DOM steel tubing undergoes various treatments and processes for improved performance:
| Process | Outcome |
| Cold Drawing | Improved strength |
| Heat Treating | Increased toughness |
| Surface Finishing | Smooth surface |
| Straightening | Improved straightness |
Steel Grade
Common steel grades used for DOM steel tubing include:
1018: Low-carbon steel with good formability.
1020: Similar to 1018 but with slightly higher carbon content.
1026: Offers more strength and hardness.
Application
DOM steel tubing is used in a variety of industries due to its strength, precision, and versatility:
Automotive: For suspension components, drive shafts, and exhaust systems.
Machinery: Used in hydraulic cylinders and equipment frames.
Construction: For structural elements and handrails.
Medical Equipment: In precision instruments and equipment.
Possible Alternative Grades
While DOM steel tubing is versatile, there are alternative grades to consider for specific applications:
4130: Chromoly steel offering higher strength.
4140: Alloy steel with better fatigue resistance.
304 Stainless Steel: For corrosion-resistant applications.
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