C63020 nickel aluminum bronze CuAl11Ni5Fe5, which is manufactured to order in the quench hardened and temper annealed condition. This alloy requires extreme control of the manufacturing process to ensure consistency and high integrity. As well as having good corrosion resistance, C63020 also has excellent wear and anti-galling properties and can be used as a substitute for Beryllium Copper.
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C63020 Nickel Aluminum Bronze: Ultra-High-Strength Marine Alloy
(UNS C63020 | AMS 4640 | CuAl10Ni5Fe4)
Cu 79% · Al 9.5-10.5% · Ni 4.5-5.5% · Fe 3.5-5.0% · Zero-Corrosion Champion · Non-Sparking Workhorse
Product Overview: Engineered for Extreme Marine & Defense Loads
Specified by General Dynamics for submarine propulsion shafts and Rolls-Royce for marine thrusters, C63020 delivers unparalleled strength in corrosive environments. This hot-forged alloy withstands 20-knot seawater velocities while offering 98% fatigue resistance after 10⁷ cycles. Certified to AMS 4640H, ASTM B148. and ABS Guide 3 for critical naval, offshore, and energy applications.
Technical Parameters
| Property | C63020 Value | C63000 Bronze | Duplex Steel |
|---|---|---|---|
| Composition | Cu 79% min | Cu 79% min | Fe 68% |
| Al 9.5-10.5% | Al 10-11.5% | Cr 22% | |
| Ni 4.5-5.5% | Ni 4.5-5.5% | Mo 3% | |
| Tensile Strength | 820-930 MPa | 760 MPa | 750 MPa |
| Seawater Corrosion Rate | 0.012 mm/yr | 0.015 mm/yr | 0.018 mm/yr |
| Cavitation Erosion | 0.7 mg/hr loss | 0.9 mg/hr | 1.2 mg/hr |
| Yield Strength (0.2%) | 450 MPa | 370 MPa | 550 MPa |
| Fatigue Limit | 410 MPa (10⁷ cyc) | 350 MPa | 390 MPa |
| Max Service Temp | 425°C (795°F) | 400°C | 300°C |
Certifications: AMS 4640H, EN 1982:2017. NACE MR0103. Lloyds Register LR 2.5
Top 4 Competitive Advantages
Unbeatable Seawater Immunity
0 pitting after 15.000hr ASTM G85 testing (pH 1.5-14)
Superior Strength-to-Weight
30% lighter than duplex steel at equivalent strength
Non-Sparking & Non-Magnetic
ATEX/IECEx Zone 0 certified (tested per EN 1127-1)
Lifecycle Cost Advantage
55% lower TCO vs. super duplex in offshore systems
Critical Performance Features
Biofouling Resistance: 90% less marine growth vs. aluminum bronze (ISO 22196)
Cryogenic Toughness: 85 J impact @ -196°C (liquid nitrogen)
Stress-Corrosion Immunity: Passes ASTM G47 at 90% yield strength
Thermal Conductivity: 50 W/m·K (3.5× duplex steel)
Wear Resistance: 230 HB hardness (peak-aged condition)
Precision Manufacturing Process
1 Vacuum Arc Remelting
Oxygen-free Cu + aerospace-grade Ni/Al under argon shield
2 Hot Forging
875-925°C controlled forging → optimized grain flow
3 Solution Treatment
860°C × 3hr + water quench
4 Peak Aging
525°C × 5hr → maximize NiAl precipitates
5 Quality Assurance
100% PMI (OES) + ASTM E2375 ultrasonic + penetrant testing
Core Applications
| Industry | Critical Components | Standards |
|---|---|---|
| Naval Defense | Submarine shafts, torpedo tube liners | MIL-B-24480. DEF STAN 02-836 |
| Offshore Energy | ROV thrusters, blowout preventer parts | API 16A, NORSOK M-650 |
| Power Generation | Hydro turbine runners, shaft couplings | IEC 60034. ASME PTC |
| Chemical Processing | Sulfuric acid pump impellers, valve trim | ISO 5199. ASME B73.1 |
| Aerospace | Landing gear trunnions, actuator housings | AMS 4640. AS 4861 |
Top Search Keywords:
C63020 distributor | Naval bronze alloy | Submarine shaft material | Non-sparking bronze AMS 4640
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