20 Years Experience | 1000+ Brand Partners | Full Customization
We have 20 years of industry experience, have partnered with over 1,000 brands, and support any customization needs.
Technical Specifications
Product Overview
Mechanical/Structural Steel Square Tube is manufactured from high-quality carbon steel designed for structural and mechanical applications. These hollow structural sections (HSS) provide excellent strength-to-weight ratio and are ideal for construction, fabrication, and engineering projects.
Key Features:
- High strength and durability for structural applications
- Excellent weldability and machinability
- Cost-effective solution for construction projects
- Uniform wall thickness and dimensional accuracy
- Available in multiple grades and finishes
Manufacturing Process: Produced using Electric Resistance Welding (ERW) or Submerged Arc Welding (SAW) processes, ensuring consistent quality and structural integrity. All tubes undergo rigorous quality control testing.
Applications: Building construction, structural frameworks, mechanical components, agricultural equipment, furniture manufacturing, architectural applications, and general fabrication projects requiring reliable structural performance.
🧪 Chemical Composition
| Element | Min % | Max % | Typical % | ASTM A500 Requirement |
|---|---|---|---|---|
| Carbon (C) | - | 0.26 | 0.18 | ≤ 0.26 |
| Manganese (Mn) | - | 1.35 | 0.90 | ≤ 1.35 |
| Phosphorus (P) | - | 0.035 | 0.020 | ≤ 0.035 |
| Sulfur (S) | - | 0.035 | 0.018 | ≤ 0.035 |
| Silicon (Si) | - | 0.40 | 0.25 | ≤ 0.40 |
| Copper (Cu) | 0.20 | - | 0.25 | ¡Ý 0.20 (when specified) |
| Chromium (Cr) | - | 0.15 | 0.08 | ≤ 0.15 |
| Nickel (Ni) | - | 0.15 | 0.08 | ≤ 0.15 |
| Iron (Fe) | Balance | Balance | 98.2 | Balance |
⚙️ Mechanical Properties
| Property | ASTM Requirement | Typical Value | Test Method | Temperature |
|---|---|---|---|---|
| Tensile Strength | 400 MPa min | 450 MPa | ASTM A370 | Room Temp |
| Yield Strength | 315 MPa min | 350 MPa | ASTM A370 | Room Temp |
| Elongation | 23% min | 28% | ASTM A370 | Room Temp |
| Hardness (Brinell) | - | 140 HB | ASTM E10 | Room Temp |
| Hardness (Rockwell B) | - | 78 HRB | ASTM E18 | Room Temp |
| Modulus of Elasticity | - | 200 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¡ãC | ASTM B311 |
| Melting Point | 1510-1540 | ¡ãC | - | DSC Analysis |
| Thermal Conductivity | 50.2 | W/m·K | 100¡ãC | ASTM E1461 |
| Specific Heat | 460 | J/kg·K | 0-100¡ãC | ASTM C351 |
| Linear Expansion | 11.7 | μm/m·K | 0-100¡ãC | ASTM E228 |
| Electrical Resistivity | 170 | nΩ·m | 20¡ãC | ASTM B193 |
| Magnetic Permeability | High | μ/μ₀ | Room Temp | ASTM A342 |
| Curie Temperature | 770 | ¡ãC | - | Ferromagnetic |
📏 Product Specifications
| Specification | Available Range | Standard Size | Custom Available | Tolerance |
|---|---|---|---|---|
| Outside Dimensions | 20mm x 20mm - 400mm x 400mm | Various | Yes | ±0.5mm |
| Wall Thickness | 1.5mm - 16mm | Various | Yes | ±10% |
| Length | 1m - 12m | 6m | Yes | +50mm/-0mm |
| Surface Finish | Black, Galvanized, Painted | Black | Yes | SSPC standards |
| Manufacturing Method | ERW, SAW | ERW | Both | ASTM standard |
| End Preparation | Plain, Beveled, Threaded | Plain | Yes | ANSI B16.25 |
| Standards Compliance | ASTM A500, A501, A618 | A500 | Multiple | Full compliance |
| Grade Options | Grade A, B, 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 |
Let Us Create Success for Your Project
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Our Advantages in Processing ท่อสี่เหลี่ยมเหล็กกล้าเชิงกล/โครงสร้าง
Precision Cold-Forming Technology
Our square tubes are manufactured through advanced cold-forming processes that maintain tight dimensional tolerances and superior surface finish.
Seamless Welding Integration
The uniform geometry and controlled chemical composition of our square tubes enable excellent weldability with minimal heat-affected zones. The precise corner radii and flat surfaces provide optimal access for welding equipment, allowing for strong, clean joints that maintain the structural integrity of the overall assembly.
Multi-Stage Quality Control
Each tube undergoes rigorous inspection processes including dimensional verification, surface quality assessment, and mechanical property testing. Our streamlined manufacturing process incorporates real-time monitoring systems that detect and correct variations immediately, ensuring every product meets or exceeds industry standards for strength, straightness, and surface quality.
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