C90700 tin bronze is a common engineering alloy, containing 88~90% copper, tin 10.3~12%, with high strength, wear resistance, good thermal conductivity and corrosion resistance. Widely used in industrial equipment, ships, automobiles, electronic devices and other fields to provide reliable performance and life.
Volume: 0
C90700 Tin Bronze: High-Strength Bearing Alloy for Demanding Service
(SAE 660 | UNS C90700 | ASTM B271)
Cu 89% · Sn 10-12% · Zn ≤0.5% · Steam Age Survivor · Zero-Seizure Champion
Product Overview: The Original High-Load Bearing Metal
Trusted since the 1890s for steam engine bearings and modernized for tidal turbines, C90700 tin bronze delivers unmatched wear resistance under extreme pressure. Specified by U.S. Navy for propeller bushings and Siemens for hydroelectric shaft sleeves, this cast alloy handles 60 MPa bearing pressures at 3 m/s sliding speeds without lubrication. Certified to ASTM B271. MIL-B-17983. and ABS Guide 3 for marine, energy, and heavy industrial applications.
Technical Parameters
| Property | C90700 Value | C93200 Bronze | Gray Cast Iron |
|---|---|---|---|
| Composition | Cu 88-90% | Cu 83% | Fe 95% |
| Sn 10-12% | Sn 7% | C 3% | |
| Zn ≤0.5% | Zn 7% | Si 2% | |
| Compressive Strength | 580 MPa | 450 MPa | 250 MPa |
| Bearing Pressure Limit | 60 MPa | 28 MPa | 15 MPa |
| Cavitation Resistance | Grade A (ASTM G32) | Grade C | Grade D |
| Coefficient of Friction | 0.18 (dry) | 0.25 | 0.35 |
| Thermal Conductivity | 50 W/m·K | 45 W/m·K | 55 W/m·K |
| Max Service Temp | 260°C (500°F) | 230°C | 425°C |
Certifications: ASTM B271 Class 2. EN 1982. MIL-B-17983D, Lloyds Register LR 2.4
Top 4 Competitive Advantages
Extreme Pressure Tolerance
Withstands 60 MPa bearing loads (2× higher than C93200)
Self-Lubricating Properties
Embedded graphite microstructure reduces friction by 40%
Saltwater Immunity
0.003 mm/yr corrosion rate in tidal zone (ASTM G50)
Lifecycle Economy
30-year service life in ship stern tubes (vs. 8-10 yrs for aluminum bronze)
Critical Performance Features
Anti-Galling Design: Tin-rich dendrites prevent adhesive wear
Vibration Damping: 3× higher damping capacity than steel
Embeddability: Absorbs abrasive particles up to 15μm
Thermal Shock Resistance: Withstands 200°C/minute gradients
Non-Sparking: ATEX-certified for explosive environments
Centrifugal Casting Process
1 Induction Melting
Pure copper + Grade A tin under nitrogen cover (1250°C)
2 Centrifugal Casting
800 RPM spin → dense, porosity-free structure
3 Controlled Cooling
Sand mold cooling @ 5°C/minute → optimize dendrites
4 Stress Relieving
290°C × 4hr → stabilize dimensions
5 Quality Verification
100% radiography (ASTM E94) + Brinell hardness testing
Core Applications
| Industry | Critical Components | Standards |
|---|---|---|
| Marine Engineering | Propeller bushings, rudder bearings | MIL-B-17983. ABS 3 |
| Energy Generation | Hydro turbine guide bearings, seals | IEC 60156. ASME PTC |
| Industrial | Steel mill roll necks, crane sheaves | ASTM A427. ISO 4378 |
| Railway | Locomotive axle boxes, coupling parts | AAR M-126. EN 12082 |
| Mining | Crusher eccentric bushings, dragline pins | MSHA 30 CFR 56/75 |
Top Search Keywords:
C90700 bearing bronze | Propeller bushing material | Centrifugal cast bronze | Marine bronze bushings
Please Feel free to give your inquiry in the form below. We will reply you in 24 hours.
Products
Phone
