C91100 tin bronze is an excellent non-ferrous metal alloy with excellent electrical, thermal, ductile and corrosion resistance properties. Its application fields are wide, including generator sets, shipbuilding and so on. The alloy has high strength, anti-friction and good machining properties, and is suitable for making complex castings and high-strength wear-resistant parts.
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C91100 Tin Bronze: Premium High-Load Bearing Alloy
(SAE 65 | UNS C91100 | ASTM B271)
Cu 86-89% · Sn 11-13% · Zn ≤0.8% · Zero-Galling Champion · Steam Age Survivor
Product Overview: The Heavy-Duty Bearing Solution
For over a century, C91100 has been the backbone of industrial machinery requiring extreme pressure resistance. Developed for steam locomotives and modernized for tidal turbines, this centrifugal-cast bronze withstands 55 MPa bearing pressures at 4 m/s sliding speeds. Trusted by Siemens for hydroelectric shaft sleeves and Caterpillar for mining equipment bushings, it exceeds ASTM B271 Class 2 and MIL-B-17983D standards for critical marine, energy, and heavy industrial applications.
Technical Parameters
| Property | C91100 Value | C93200 Bronze | Gray Iron |
|---|---|---|---|
| Composition | Cu 86-89% | Cu 83% | Fe 95% |
| Sn 11-13% | Sn 7% | C 3% | |
| Compressive Strength | 550 MPa | 450 MPa | 250 MPa |
| Bearing Pressure Limit | 55 MPa | 28 MPa | 15 MPa |
| Coefficient of Friction | 0.16 (lubricated) | 0.22 | 0.35 |
| Thermal Conductivity | 45 W/m·K | 40 W/m·K | 55 W/m·K |
| Cavitation Resistance | Grade A (ASTM G32) | Grade C | Grade D |
| Max Service Temp | 250°C (480°F) | 230°C | 425°C |
Certifications: ASTM B271 Class 2. EN 1982. MIL-B-17983D, Lloyds LR 2.4
Top 4 Competitive Advantages
Extreme Load Capacity
Handles 55 MPa bearing pressures (96% higher than C93200)
Self-Lubricating Microstructure
Tin-rich dendrites reduce friction by 35% in start-stop cycles
Saltwater Corrosion Immunity
0.002 mm/yr erosion in tidal zones (ASTM G50)
30-Year Lifespan Economy
3× longer service than aluminum bronze in stern tubes
Critical Performance Features
Anti-Galling Design: Eutectoid tin matrix prevents adhesive wear
Vibration Damping: 4× higher than steel (ASTM E756)
Embeddability: Absorbs 20μm abrasive contaminants
Thermal Shock Resistance: Withstands 150°C/minute gradients
Non-Sparking: ATEX/IECEx Zone 0 certified
Precision Manufacturing Process
1 Vacuum Induction Melting
Oxygen-free Cu + Grade A Sn @ 1150°C under argon
2 Centrifugal Casting
700-900 RPM spin → zero-porosity structure
3 Controlled Solidification
Sand mold cooling @ 6°C/min → optimize δ-phase
4 Stress Relief
285°C × 5hr → dimensional stability
5 Quality Assurance
100% UT + radiography (ASTM E94) + Brinell testing
Core Applications
| Industry | Critical Components | Standards |
|---|---|---|
| Marine Engineering | Rudder bearings, propeller shafts | ABS 3. DNVGL-CP-0429 |
| Hydroelectric | Turbine guide bearings, wicket gates | IEC 60156. ASME PTC |
| Mining | Crusher eccentrics, dragline pins | MSHA 30 CFR 56/75 |
| Industrial | Steel mill rolls, crane sheaves | ISO 4378. ASTM A427 |
| Railway | Locomotive axle boxes, couplers | EN 12082. AAR M-126 |
Top Search Keywords:
C91100 bronze bushings | High-load bearing bronze | Marine shaft sleeves | Centrifugal cast C91100
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