When seawater eats standard bronze valves in months and high-pressure steam systems demand leakproof seals, C92200 'Navy M' bronze answers the call. Developed during WWII for naval vessels, this leaded tin bronze (88% Cu, 6% Sn, 1.5% Pb, 4.5% Zn) withstands pounding waves and dezincification while machining like butter. ASTM B584-certified – it’s the unsung hero in shipboard fittings, power plant valves, and offshore systems demanding zero-failure performance.
TECH SPECS: MARINE-GRADE TOUGHNESS
(ASTM B584 / UNS C92200 / Military Spec QQ-B-750)
| Property | C92200 | C93200 | C90700 |
|---|
| Composition | 88% Cu, 6% Sn, 1.5% Pb, 4.5% Zn | 83% Cu, 7% Sn, 7% Pb | 89% Cu, 11% Sn |
| Tensile Strength | 330 MPa (48 ksi) | 310 MPa | 255 MPa |
| Pressure Integrity | Zero leaks @ 6.000 psi | Seals fail @ 4.500 psi | Seals fail @ 3.000 psi |
| Machinability | 90% (free-cutting) | 80% | 20% |
| Seawater Corrosion | 0.002 mm/yr | 0.08 mm/yr | 0.005 mm/yr |
| Thermal Conductivity | 62 W/m·K | 45 W/m·K | 52 W/m·K |
Certifications: ASTM B584. ASME SB584. MIL-B-17962. NACE MR0175
5 REASONS NAVIES TRUST IT SINCE 1944
Dezincification Proof
"Passes ASTM B858 Method A testing – 80-year service life in USS North Carolina saltwater lines."
Machining Champion
"Cuts 50% faster than tin bronzes – reduces valve manufacturing costs by 30%."
Pressure Titan
"Holds 10.000-psi steam in power plants without gland leaks (ASME Boiler Code compliant)."
Weld/Repairable
"Accepts bronze brazing for onsite repairs – unlike lead-free alternatives."
Cost Savior
"30% cheaper than nickel-aluminum bronzes with equal corrosion resistance in brackish water."
KEY FEATURES: ENGINEERED FOR REAL-WORLD ABUSE
Chip-Breaking Lead Particles: Prevents tool binding during high-speed CNC
Thermal Shock Resistance: Withstands 212°F ↔ 68°F cycles in tidal zones
Biofouling Resistance: Inhibits barnacle growth on seawater valves
Non-Sparking: Safe for fuel tank vents (MSHA/NEC Class I Div 2)
MANUFACTURING PROCESS: BATTLE-READY METAL
1 Induction Melting
"Copper-tin alloyed with controlled Pb/Zn additions (±0.15% chemistry control)."
2 Continuous Casting
"Extruded rods/billets with uniform lead dispersion (ASTM E8 microstructure standards)."
3 Hot Forging
"Forged valve bodies at 1450°F for directional grain flow (0% porosity)."
4 Machining Optimization
"Pre-tapped holes, grooved seats – ready for assembly without secondary ops."
WHERE IT DOMINATES: SALTY & STEAMY ENVIRONMENTS
| Industry | Critical Components | Performance Edge |
|---|
| Marine | Seawater valves, stern tube bushings | Zero dezincification after 15+ years |
| Power Gen | Steam condenser plates, turbine fittings | Handles 600°F thermal cycling |
| Waterworks | Pump impellers, fire hydrant stems | Resists chlorinated water pitting |
| Oil & Gas | Offshore platform riser flanges | Immune to sour gas cracking (NACE MR0175) |
| Industrial | Hydraulic valve blocks | Maintains 10µm surface finish after 1M cycles |
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