AMS 4640 Nickel Aluminum Bronze alloy is an excellent choice for applications involving heavy loads, abrasive wear resistant, friction, abrasive wear and corrosion. The addition of nickel increases the alloys strength without diminishing its excellent ductility, toughness and corrosion resistance.
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AMS 4640 Nickel Aluminum Bronze: Ultra-Corrosion-Resistant Aerospace & Marine Alloy
(SAE-AMS-4640 | UNS C95800 | CuAl9Ni5Fe4)
Cu 79-85% · Al 8.5-9.5% · Ni 4.0-5.5% · Fe 3.5-5.0% · Saltwater Champion · Zero-Gall Specialist
Product Overview: Mission-Critical Performance
Trusted by Lockheed Martin for submarine components and Rolls-Royce Marine for propeller systems, AMS 4640 delivers unmatched corrosion resistance in extreme environments. This nickel-enhanced aluminum bronze withstands seawater, acids, and high-pressure steam while offering 2x the fatigue strength of standard bronzes – meeting MIL-STD-753 for aerospace and DEF STAN 02-824 for naval applications.
Technical Parameters
| Property | AMS 4640 Value | C95400 Bronze | 316L Stainless |
|---|---|---|---|
| Composition | Cu 79-85% | Cu 85% | Fe 65% |
| Al 8.5-9.5% | Al 11% | Cr 17% | |
| Ni 4.0-5.5% | Fe 4% | Ni 12% | |
| Tensile Strength | 690-830 MPa | 620 MPa | 485 MPa |
| Seawater Corrosion Rate | 0.015 mm/yr | 0.035 mm/yr | 0.025 mm/yr |
| Fatigue Strength | 310 MPa (10⁷ cycles) | 260 MPa | 240 MPa |
| Impact Toughness | 110 J @ -40°C | 75 J | 100 J |
| Max Service Temp | 400°C (750°F) | 260°C | 870°C |
| Thermal Conductivity | 42 W/m·K | 59 W/m·K | 16 W/m·K |
Certifications: AMS 4640 Rev H, MIL-B-24480. NACE MR0175. Lloyds Register 90. RoHS/REACH
Top 4 Competitive Advantages
Corrosion Immunity
Zero pitting after 5.000hr salt-spray testing (ASTM B117)
Extreme Fatigue Resistance
40% higher cyclic strength vs. aluminum bronze
Stress-Corrosion Cracking Immunity
Passes ASTM G47 at 75% yield strength
Galling Resistance
μ=0.16 friction coefficient without lubrication
Critical Performance Features
Biofouling Resistance: 80% less marine growth vs. brass
Cavitation Erosion Resistance: 6x better than 316 stainless (ASTM G32)
Non-Sparking: ATEX/IECEx certified for explosive zones
Thermal Stability: Maintains strength from -196°C to 400°C
EMI Shielding: 95% RF attenuation up to 18 GHz
Precision Manufacturing Process
1 Vacuum Induction Melting
Oxygen-free copper + aerospace-grade alloys → argon shielding
2 Investment Casting
Ceramic shells for ±0.1mm tolerance
3 Hot Isostatic Pressing (HIP)
1.100°C @ 100 MPa → eliminates microporosity
4 Solution Annealing
790°C × 8hr + water quenching
5 Quality Assurance
100% PMI (OES/XRF) + RT/UT per ASTM E186/E2375
Core Applications
| Industry | Critical Components | Standards |
|---|---|---|
| Aerospace | Landing gear bushings, actuator systems | AMS 4640K, AS 4861 |
| Marine Engineering | Propellers, shaft seals, valve bodies | MIL-S-24112. DNV GL |
| Oil & Gas | Subsea connectors, Christmas tree parts | API 6A, NACE MR0103 |
| Power Generation | Turbine governor shafts, pump impellers | ASME PTC 19.3 |
| Chemical Processing | Reactor agitators, acid pump components | ISO 2858. ASME B73.1 |
Top Search Keywords:
AMS 4640 distributor | Nickel aluminum bronze propeller | Subsea valve alloy | Aerospace bronze bushings
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