C90200 tin bronze has high strength, good elasticity and wear resistance, is easy to solder and lead solder, and has good corrosion resistance and processability in atmosphere, fresh water, and seawater. It is suitable for hot pressing processing.
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When crushers chew through bushings in months and gearboxes scream under load, C90200 Tin Bronze answers. This copper-tin alloy (89% Cu, 10% Sn, 1% Zn) carries crushing forces while gliding like butter against steel. RoHS-exempt per Annex III 6c – it’s the quiet champion in mining rigs, steel mills, and century-old bridges still running smooth.
TECH SPECS: ENGINEERED FOR SILENT ENDURANCE
(ASTM B271 / UNS C90200 / RoHS Annex III Exempt)
| Property | C90200 | C93200 (SAE 660) | Aluminum Bronze |
|---|---|---|---|
| Composition | 89% Cu, 10% Sn, 1% Zn | 83% Cu, 7% Sn, 7% Pb | 81% Cu, 11% Al, 4% Fe |
| Tensile Strength | 345 MPa | 310 MPa | 586 MPa |
| Yield Strength (0.2%) | 170 MPa | 145 MPa | 207 MPa |
| Coefficient of Friction | 0.18 (vs steel) | 0.22 | 0.25 |
| Max PV Value | 45.000 psi·ft/min | 28.000 | 50.000 |
| Thermal Conductivity | 58 W/m·K | 45 W/m·K | 59 W/m·K |
Certifications: ASTM B271. ASME SB271. ABS Marine, Lloyds Register, RoHS Annex III 6c
5 REASONS FACTORIES NEVER REPLACE IT
Silent Running
"Self-lubricating tin-rich phase reduces noise by 15 dB vs. leaded bronze – hear the difference in textile looms."
Wear Immunity
"Outlasts C93200 by 5X in sugar mill rollers – 0.03mm wear after 20.000 operating hours."
Embeddability
"Traps grit and dust in microstructure – protects shafts in dirty environments (mines, cement plants)."
Corrosion Guard
"Zero dezincification in seawater – used in Statue of Liberty’s 1926 restoration bearings."
Cost Slayer
"Eliminates lubrication costs: runs dry in conveyor systems saving $8.000/year per machine."
KEY FEATURES: BEYOND THE DATA SHEET
Fatigue Resistance: Handles cyclic loading in stamping presses (200+ million cycles)
Vibration Damping: Absorbs shock in railroad couplers and mining shakers
Thermal Stability: Maintains properties from -40°C to 200°C
Chip Control: Machines cleanly at 130 SFM – short chips, no built-up edge
PRECISION PROCESSING: FROM METAL TO MASTERPIECE
1 Vacuum Melting
"Cu-Sn alloyed under inert gas – eliminates porosity for dense, uniform grain structure."
2 Centrifugal Casting
"Spun at 1.500 RPM into void-free bushings/sleeves (±0.5% dimensional tolerance)."
3 Heat Treatment
"Stress-relieved at 290°C – optimizes hardness (BHN 80) without brittleness."
4 Finish Machining
"CNC-turned to Ra 0.8μm mirror finish – ready for press-fit assembly."
WHERE IT RULES: INDUSTRY WORKHORSES
| Industry | Critical Components | Why C90200? |
|---|---|---|
| Mining | Crusher eccentric bushings | Embeds abrasive ore dust, protects shafts |
| Steel Mills | Rolling mill gear sleeves | Withstands scale contamination at 300°C |
| Marine | Rudder bearings, pump sleeves | Immune to saltwater dezincification |
| Power Gen | Turbine thrust washers | Dampens vibration at 12.000 RPM |
| Railroad | Coupler knuckle bushings | Runs dry, zero maintenance in all weather |
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