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Technical Specifications
Product Overview
Electric Welded (ERW) Round Steel Tube is manufactured using high-frequency electric resistance welding technology from quality carbon steel strip. This process creates a strong, continuous weld seam that provides excellent structural integrity and uniform wall thickness throughout the tube length.
Key Features:
- Superior dimensional accuracy and consistency
- Smooth interior and exterior surface finish
- Excellent weldability and machinability
- Cost-effective manufacturing process
- Wide range of sizes and wall thicknesses available
Manufacturing Process: High-frequency electric resistance welding (ERW) process where steel strip is formed into tube shape and welded using electrical resistance heating, followed by sizing and finishing operations.
Applications: Structural applications, mechanical engineering, automotive components, furniture manufacturing, construction projects, fluid transportation systems, and general fabrication work requiring round hollow sections.
🧪 Chemical Composition
| Element | Min % | Max % | Typical % | ASTM A513 Requirement |
|---|---|---|---|---|
| Carbon (C) | 0.15 | 0.25 | 0.20 | 0.15-0.25 |
| Manganese (Mn) | 0.30 | 0.60 | 0.45 | 0.30-0.60 |
| Phosphorus (P) | - | 0.040 | 0.025 | ≤ 0.040 |
| Sulfur (S) | - | 0.050 | 0.030 | ≤ 0.050 |
| Silicon (Si) | 0.15 | 0.35 | 0.25 | 0.15-0.35 |
| Copper (Cu) | - | 0.20 | 0.10 | ≤ 0.20 |
| Nickel (Ni) | - | 0.20 | 0.10 | ≤ 0.20 |
| Chromium (Cr) | - | 0.15 | 0.08 | ≤ 0.15 |
| Iron (Fe) | Balance | Balance | 98.9 | Balance |
⚙️ Mechanical Properties
| Property | ASTM Requirement | Typical Value | Test Method | Temperature |
|---|---|---|---|---|
| Tensile Strength | 400 MPa min | 450 MPa | ASTM A370 | Room Temp |
| Yield Strength (0.2%) | 220 MPa min | 250 MPa | ASTM A370 | Room Temp |
| Elongation | 20% min | 25% | ASTM A370 | Room Temp |
| Hardness (Brinell) | - | 130 HB | ASTM E10 | Room Temp |
| Hardness (Rockwell B) | - | 75 HRB | ASTM E18 | Room Temp |
| Modulus of Elasticity | - | 210 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 | 1510-1540 | °C | - | DSC Analysis |
| Thermal Conductivity | 50.2 | W/m·K | 100°C | ASTM E1461 |
| Specific Heat | 460 | J/kg·K | 0-100°C | ASTM C351 |
| Linear Expansion | 11.5 | μm/m·K | 0-100°C | ASTM E228 |
| Electrical Resistivity | 170 | n|°¤m | 20°C | ASTM B193 |
| Magnetic Permeability | High | μ/μ₀ | Room Temp | ASTM A342 |
| Curie Temperature | 770 | °C | - | Ferromagnetic |
📏 Product Specifications
| Specification | Available Range | Standard Length | Custom Available | Tolerance |
|---|---|---|---|---|
| Outside Diameter (OD) | 10mm - 508mm | Various | Yes | ±0.5mm |
| Wall Thickness | 1.0mm - 20mm | Various | Yes | ±10% |
| Length | 1m - 12m | 6m | Yes | +50mm/-0mm |
| Surface Finish | Black, Galvanized, Painted | Black | Yes | Ra ≤ 6.3μm |
| Weld Type | ERW (Electric Resistance) | ERW | Standard | ASTM standard |
| End Connection | Plain, Beveled, Threaded | Plain | Yes | ASME B36.10 |
| Standards Compliance | ASTM A513, A500, A501 | A513 | Multiple | Full compliance |
| Grade Options | Grade A, Grade B, Grade C | Grade B | Yes | Per specification |
| Test Certificate | Mill TC, EN 10204 3.1 | Mill TC | Yes | Standard |
| Packaging | Bundles, Crates, Containers | Bundles | Custom | Export standard |
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Our Advantages in Processing ท่อเหล็กรอบเชื่อมไฟฟ้า (ERW)
Precise Electric Welding Control
Advanced electric resistance welding technology ensures consistent seam quality and superior joint strength. Computer-controlled welding parameters maintain precise temperature and pressure throughout the welding process, resulting in reliable, high-integrity tube formation.
Uniform Wall Thickness
The ERW manufacturing process enables exceptional control over wall thickness consistency through automated rolling and forming. This precision results in tubes with minimal thickness variation, ensuring optimal structural integrity and performance.
Efficient Continuous Production
The electric welded tube production line operates continuously, allowing for high-volume manufacturing with minimal downtime. This streamlined process reduces production costs while maintaining consistent quality across long production runs.
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