C72700 Bronze Bushings
C72700 Bronze Bushings
C72700 (CuNi9Sn6) Bronze Bushings: High-Strength, Beryllium-Free Solution
Engineered for Extreme Load, Wear, and Corrosion Resistance
C72700 (CuNi9Sn6) bronze bushings offer unparalleled performance for heavy-duty applications. This high-performance, beryllium-free alternative to traditional alloys such as C17200 (Beryllium Copper) and C95400 (Aluminum Bronze) is perfect for demanding industries like aerospace, oil & gas, heavy machinery, and marine engineering.
Why Choose C72700?
- Extreme Load Capacity: Handles pressures exceeding 825 MPa (120 ksi), ideal for high-load applications.
- Superior Anti-Galling & Wear Resistance: Outperforms other alloys, reducing maintenance and downtime.
- Beryllium-Free & Safe: A safer, environmentally compliant solution with no toxic dust or health hazards.
- Non-Magnetic & Non-Sparking: Perfect for environments sensitive to magnetic interference or explosive hazards.
Core Features of C72700 Bronze Bushings:
1. Extreme Load & Pressure Resistance
C72700 bushings are engineered to withstand extreme static and dynamic loads without deformation, ensuring long-term reliability for your equipment.
2. Superior Anti-Galling Performance
Even in high-load, low-speed, or oscillating applications, C72700’s unique microstructure prevents galling and seizure, ensuring smooth operation under boundary lubrication.
3. Total Environmental Compliance
C72700 is a Beryllium-free and Lead-free alloy, making it compliant with international health and safety standards like RoHS and REACH.
4. Complete Corrosion Immunity
Highly resistant to corrosion, including seawater, chlorides, and sour gas (H₂S), C72700 ensures your equipment remains functional even in harsh environments.
5. Non-Magnetic & Non-Sparking
C72700’s non-magnetic properties make it ideal for applications requiring electromagnetic interference avoidance, such as precision sensors and MWD/LWD tools. It is also non-sparking, making it safe for explosive or flammable environments.
Material Comparison:
| Feature | C72700 (CuNi9Sn6) | C17200 (Beryllium Copper) | C95400 (Aluminum Bronze) |
|---|---|---|---|
| Beryllium-Free | ✅ Yes (Safe & Compliant) | ❌ No (Toxic Dust Hazard) | ✅ Yes |
| Anti-Galling Performance | ⭐ Exceptional | ⭐ Excellent | 🔶 Good |
| Extreme Load Capacity | ⭐ Extremely High | ⭐ Extremely High | 🔷 High |
| H₂S (Sour Gas) Corrosion | ⭐ Excellent | 🔶 Fair | 🔶 Good |
| Lubrication Tolerance | ⭐ High | ⭐ High | 🔷 Medium |
Primary Industrial Applications:
- Oil & Gas:
- Drilling Riser Bushings
- MWD/LWD Tool Bearings
- Downhole Motor Components
- Valve Stem Bushings
- Requirements: High pressure, resistance to seawater, non-magnetic.
- Heavy Machinery & Mining:
- Excavator & Crusher Bushings
- Pivot & Thrust Washers
- Tunnel Boring Machine Bearings
- Requirements: High impact, abrasion, and heavy loads.
- Marine & Offshore:
- Rudder Bearings
- Deck Machinery Bushings
- Subsea Connectors
- Requirements: Seawater corrosion resistance, high strength.
Customization Options:
We offer precision CNC machining services to meet your exact design requirements. Available customizations include:
- Oil Grooves: Spiral, figure-8, or “8”-shaped for various lubrication needs.
- Flanges and Keyways to fit specific operational conditions.
- High-Precision Tolerances to ensure your components meet exact specifications.
Technical Specifications:
Chemical Composition:
- Copper (Cu): Balance
- Nickel (Ni): 8.5 – 9.5%
- Tin (Sn): 5.5 – 6.5%
- Iron (Fe): 0.50% max
- Zinc (Zn): 0.50% max
- Manganese (Mn): 0.20% max
Physical Properties:
- Density: 8.94 g/cm³ (0.323 lb/in³)
- Modulus of Elasticity: 131 GPa (19,000 ksi)
- Thermal Conductivity: 29 W/(m·K)
- Magnetic Permeability: <1.01 (non-magnetic)
Mechanical Properties:
| Parameter | Metric | Imperial |
|---|---|---|
| Tensile Strength | 760 – 900 MPa | 110 – 130 ksi |
| Yield Strength | 720 – 820 MPa | 105 – 120 ksi |
| Elongation | 5% – 12% | 5% – 12% |
| Hardness | 280 – 320 HB | 28 – 34 HRC |
Frequently Asked Questions (FAQ):
Q: Can C72700 effectively replace Beryllium Copper (C17200)?
A: Yes, in the majority of heavy-duty industrial bearing and bushing applications, C72700 provides comparable strength and superior anti-galling performance while being much safer and fully compliant with environmental regulations.
Q: Is C72700 truly non-magnetic?
A: Yes, C72700 is essentially non-magnetic (relative permeability <1.01), making it suitable for applications where magnetic interference must be avoided, such as oilfield tools and precision sensors.
Q: How does C72700 perform in poorly lubricated or dry-run conditions?
A: C72700 excels in such conditions. Its low coefficient of friction and high resistance to adhesion (welding) make it ideal for boundary lubrication scenarios or high-vibration applications.
Q: What customization options are available for C72700 bushings?
A: We offer full CNC machining services to meet your design requirements, including custom oil grooves, keyways, and precise tolerances to meet your specific operational needs.
Get a Quote for Your C72700 Bushing Requirements
Ensure the reliability and compliance of your equipment with the industry’s most durable beryllium-free bronze. Contact our technical team today for a competitive quote or to discuss your application in detail.
