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Technical Specifications
Product Overview
Drawn Over Mandrel (DOM) Steel Round Tube is manufactured using a specialized cold drawing process that produces superior dimensional accuracy, surface finish, and mechanical properties. The DOM process involves drawing the tube over a mandrel to achieve precise internal diameter control and improved surface quality.
Key Features:
- Superior dimensional accuracy and concentricity
- Excellent surface finish both inside and outside
- Enhanced mechanical properties through cold working
- Consistent wall thickness throughout length
- High strength-to-weight ratio
Manufacturing Process: Cold drawn over mandrel process ensures precise internal diameter control, superior surface finish, and enhanced mechanical properties through work hardening.
Applications: Hydraulic cylinders, pneumatic cylinders, automotive components, machinery parts, structural applications, precision mechanical assemblies, and applications requiring high dimensional accuracy and surface quality.
🧪 Chemical Composition
| Element | Min % | Max % | Typical % | ASTM A513 Requirement |
|---|---|---|---|---|
| Carbon (C) | 0.13 | 0.18 | 0.15 | 0.13-0.18 |
| Manganese (Mn) | 0.30 | 0.60 | 0.45 | 0.30-0.60 |
| Phosphorus (P) | - | 0.035 | 0.020 | ≤ 0.035 |
| Sulfur (S) | - | 0.035 | 0.025 | ≤ 0.035 |
| Silicon (Si) | 0.15 | 0.35 | 0.25 | 0.15-0.35 |
| Chromium (Cr) | - | 0.25 | 0.10 | ≤ 0.25 |
| Nickel (Ni) | - | 0.25 | 0.10 | ≤ 0.25 |
| Molybdenum (Mo) | - | 0.08 | 0.03 | ≤ 0.08 |
| Iron (Fe) | Balance | Balance | 98.8 | Balance |
⚙️ Mechanical Properties
| Property | ASTM Requirement | Typical Value | Test Method | Temperature |
|---|---|---|---|---|
| Tensile Strength | 525 MPa min | 580 MPa | ASTM A370 | Room Temp |
| Yield Strength (0.2%) | 315 MPa min | 380 MPa | ASTM A370 | Room Temp |
| Elongation | 20% min | 25% | ASTM A370 | Room Temp |
| Hardness (Brinell) | 170-229 HB | 200 HB | ASTM E10 | Room Temp |
| Hardness (Rockwell B) | 88-95 HRB | 92 HRB | ASTM E18 | Room Temp |
| Modulus of Elasticity | - | 205 GPa | ASTM E111 | Room Temp |
| Impact Energy (Charpy V) | - | 80+ J | ASTM E23 | Room Temp |
🔬 Physical Properties
| Property | Value | Unit | Temperature | Test Standard |
|---|---|---|---|---|
| Density | 7.85 | g/cm3 | 20°C | ASTM B311 |
| Melting Point | 1425-1540 | °C | - | DSC Analysis |
| Thermal Conductivity | 51.9 | W/m·K | 100°C | ASTM E1461 |
| Specific Heat | 486 | J/kg·K | 0-100°C | ASTM C351 |
| Linear Expansion | 11.7 | μm/m·K | 0-100°C | ASTM E228 |
| Electrical Resistivity | 162 | n|°¤m | 20°C | ASTM B193 |
| Magnetic Permeability | High | μ/μ₀ | Room Temp | ASTM A342 |
| Curie Temperature | 770 | °C | - | Magnetic |
📏 Product Specifications
| Specification | Available Range | Standard Length | Custom Available | Tolerance |
|---|---|---|---|---|
| Outside Diameter (OD) | 12.7mm - 203mm | Various | Yes | ±0.13mm |
| Wall Thickness | 1.65mm - 12.7mm | Various | Yes | ±5% |
| Length | 3m - 12m | 6m | Yes | +25mm/-0mm |
| Surface Finish | Cold Drawn, Bright | Cold Drawn | Yes | Ra ≤ 1.6μm |
| Manufacturing Process | DOM, Cold Drawn | DOM | Standard | ASTM A513 |
| End Condition | Plain End, Deburred | Plain End | Yes | Square cut ±1° |
| Standards Compliance | ASTM A513, A519 | A513 | Multiple | Full compliance |
| Straightness | 0.5mm/m max | Standard | Precision | ASTM A513 |
| Test Certificate | Mill TC, EN 10204 3.1 | Mill TC | Yes | Standard |
| Packaging | Bundles, Crates | Bundles | Custom | Export standard |
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Our Advantages in Processing ท่อกลมเหล็กที่ถูกดึงผ่านมานดเรล (DOM)
Precise Dimensional Control
The drawn-over-mandrel process enables exceptional control over tube dimensions, achieving tight tolerances and consistent wall thickness throughout the entire length. This precision manufacturing method ensures reliable fitment and performance in critical applications.
Superior Surface Finish
Cold drawing over a mandrel produces an exceptionally smooth interior and exterior surface finish, reducing friction and improving flow characteristics. The process eliminates surface imperfections and creates a uniform, polished appearance.
Enhanced Mechanical Strength
The cold drawing process work-hardens the steel material, significantly improving its mechanical properties including tensile strength and hardness. This results in superior durability and structural integrity compared to standard welded tubes.
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