Product Definition
Carbon fiber round tubes are high-performance hollow structural components made from PAN-based or pitch-based carbon fibers reinforced with thermoset resins (epoxy, polyester, or phenolic). Manufactured via pultrusion, filament winding, or compression molding, these tubes combine lightweight design, extreme strength, corrosion resistance, and tailor-made properties for industrial applications.
Materials & Manufacturing
Fiber Specifications
- Standard Grades: T300, T700, T800, T1000
- High Modulus: M40J, M55J, M60J
- Surface Patterns: 3K/12K plain weave, twill weave, UD unidirectional, hybrid layup
Resin Systems
- Standard Epoxy: For temperatures ≤120°C
- High-Temp Epoxy: Stable at -50°C to 180°C (short-term 200°C)
- Flame-Retardant Epoxy: UL94-V0 compliant (aviation/railway approved)
Production Processes
| Process | Key Advantages | Tolerance | Best For |
|---|---|---|---|
| Pultrusion | Continuous production, straightness | ±0.05 mm | High-volume standard tubes |
| Filament Winding | Adjustable fiber angles (hoop/spiral) | ±0.1 mm | High-pressure/torsional loads |
| Compression Molding | Complex shapes, localized thickening | ±0.02 mm | Precision-assembly parts |
Post-Processing
- Surface Finish: Matte/glossy, 3K twill, UV coating, nickel plating
- Machining: CNC turning, milling, drilling, threading, metal sleeve bonding
Main Product Specifications
| Parameter | Range | Precision Grade |
|---|---|---|
| Outer Diameter (OD) | 1–800 mm (customizable) | – |
| Wall Thickness (WT) | 0.2–10 mm | – |
| Length (L) | 0.1–10 m (max 10 m for pultrusion) | – |
| Straightness | ≤0.3 mm/m | ≤0.1 mm/m |
| Roundness | ≤0.05 mm | ≤0.02 mm |
Mechanical Properties
| Property | Value | vs. Metals |
|---|---|---|
| Density | 1.55 g/cm³ | 80% lighter than steel |
| Tensile Strength | 3,000–3,500 MPa | 6–12x stronger than steel |
| Elastic Modulus | 165–230 GPa | 3x stiffer than aluminum |
| Interlaminar Shear | 80–110 MPa | Superior to aluminum |
| CTE | <1.5×10⁻⁶/°C | 1/10 of steel (thermal stable) |
| Corrosion Resistance | No rust in pH 3–11, salt spray ≥1,000 hrs | |
| Fatigue Life | 10⁷ cycles @ 90% strength retention |
Key Advantages
✅ Ultra-Lightweight: 30–50% lighter than aluminum, 70%+ vs. steel at equal stiffness.
✅ High Strength-to-Weight: Replaces steel/titanium in dynamic load applications.
✅ Corrosion-Free: Ideal for marine, chemical, and high-humidity environments.
✅ EMC-Compatible: Non-magnetic, low conductivity for medical/radar systems.
✅ Design Flexibility: Custom layup angles, tapered walls, and localized reinforcement.
Applications
✈️ Aerospace: UAV arms, wing spars, satellite trusses, landing gear struts.
🏭 Industrial: Robot linkages, PCB handling shafts, textile rollers.
🏥 Medical: CT scanner rings, surgical robot arms, foldable stretchers.
🚄 Transportation: Train couplers, pantograph rods, cabin handrails.
🎿 Sports: Racing paddles, bike forks, golf club shafts.
Quality Assurance
- Certifications: ISO 9001 & AS9100D (aerospace standard)
- Testing: 100% dimensional check + ultrasonic NDT + material batch reports
- Compliance: ASTM D3039, EN 13706, GB/T 3354
Customization Workflow
- Requirement Analysis (load conditions, environment, connections)
- 3D Modeling & FEA Simulation (stress/weight optimization)
- Prototyping (3–7 days, CNC-machined samples)
- Batch Production → Shipping (anti-static packaging + wooden crates for long tubes)
Case Studies
🔹 eVTOL Wing Spar: OD 40 mm, WT 2 mm, L 2.2 m, 580g weight, withstands 8 kN bending load (fatigue >1M cycles).
🔹 CT Scanner Rotor: OD 150 mm, WT 3 mm, roundness ≤0.02 mm, zero vibration at 120 RPM.
Ordering Information
- MOQ: 1 piece (standard sizes ship in 2–3 days; custom lead time 7–15 days).
- Support: Free CAE simulation, adhesive/metal joint design assistance.
- Contact: Send drawings/specs for instant quotes and technical review.
Resources
Carbon fiber round tubes redefine performance limits—lighter, stronger, and built for the future.
Offline Contracts
All sales of our carbon fiber materials are conducted through offline contract agreements to ensure each order precisely meets your specifications, compliance requirements, and agreed payment terms. Please contact our sales team to initiate the contract process and discuss project details.
| name | value | unitCode | unitText |
|---|---|---|---|
| MOQ | 50 | PCS | |
| Lead Time | 5–20 | business days | |
| Material | Carbon Fiber | ||
| Size | Customizable (inner diameter / outer diameter / length) |
