Nickel Aluminium Bronze AMS 4640 (UNS C63000)

Technical Data Sheet

Chemical Composition Limits
Weight % Cu Al Fe Mn Ni Si Sn Zn
AMS 4640
Bal 9.0-11.0 2.0-4.0 1.5 4.0-5.5 0.25 0.20 0.30

Nickel Aluminum Bronze (AMS 4640) contains 5% nickel and is heat treatable. Available in both rod and forged form, it is intended for applications that require combinations of corrosion resistance, excellent bearing properties at considerable loads, and extremely high strength both at room and elevated temperatures.

Typical Mechanical Properties

Material Diameter

Tensile Strength ksi

Yield Strength ksi Elongation 4D % Hardness HB
AMS 4640 Annealed Bar <1.0" 110 68 10 201-248
AMS 4640 Annealed Bar 1.0" - 2.0" 110 60 10 201-248
AMS 4640 Annealed Bar 2.0" - 3.0" 105 55 10 187-241
AMS 4640 Annealed Bar 3.0" - 5.0" 100 50 10 187-241

Physical Properties AMS 4640
Melting Point - Liquidus - 1930 F
Melting Point - Solidus - 1895 F
Density - 0.274 lb/in3 at 68 F
Specific Gravity - 7.58
Electrical Resistivity - 116.0 ohms-cmil/ft @ 68 F
Electrical Conductivity - 7 %IACS @ 68 F
Thermal Conductivity - 22.6 Btu · ft/(hr · ft2·oF)at 68F
Coefficient of Thermal Expansion - 9.0 ·10-6 per oF (68-572 F)
Specific Heat Capacity - 0.09 Btu/lb/oF at 68 F
Modulus of Elasticity in Tension - 7500 ksi
Modulus of Rigidity - 6400 ksi
Machinability Rating -30%

Nickel Aluminium Bronze AMS 4640 is available in
Sizes available: AMS 4640
SOLID BAR 3/16” - 8” diameter
HEX BAR 5/8" - 2 1/2"
For all other stock availability contact Sales.


Similar Specifications
ASTM B-150, B-124, B-171, B-283
SAE J463
NF L14-705
WS 2.0966
DIN 17672
GAM MM11 CuAl9Ni5Fe2
GAM MM13 CuAl9Ni5Fe4
ISO 428
NFA 51-116
NES 833
UNS C63000
AMS 4640 Aluminium Bronze Bar, Drawn and Stress releived (HR50) or Temper Annealed (TQ50)

Typical Uses of Nickel Aluminium Bronze AMS 4640
Oil & Gas - Valve Stems, Pump Shafts, Seal Glands, BOP Parts
Aerospace - Landing Gear Bushings & Bearings, Flap Bushings, Actuator, Parts, Strut Bushings
Automotive - Valve Guides, Valve Seats
Other Industrial - Balls, Gears, Cams, Shafting, Condenser Tube for Power Stations and Desalting Units, Valve Seats, Valve Guides,Pump Shafts, Structural Members, Tanks, Heat Exchanger,Headers, Heat Exchanger Flanges, Bearings, Bushings, Valve Balls, Hydraulic Bushings for Earth Moving Equipment, Corrosion Resistant Articles, Aircraft Parts, Welded Piping Systems, Plunger Tips, Pump Parts, Plunger Tips
Marine - Pump Parts, Bolts, Ship Propellers, Propeller Nuts, Shafts

Corrosion Resistance
C63000 has good resistance to sulphuric, hydrochloric and other non-oxidizing acids, as well as salt water and brackish waters. Its superior erosion and cavitation properties facilitate use in pump and propeller applications. Retention of properties together with good oxidation resistance at elevated temperatures make C63000 suitable for service in internal combustion engines, steam plant applications and chemical processing applications. Very little deterioration takes place below 600° F and oxidation is retarded up to 1200° F by an oxide film. C63000 is very resistant to stress corrosion cracking in numerous applications. Galling is a common problem designers have to overcome when choosing materials. Affinity between two mating metallic surfaces can easily introduce galling when exposed to large bearing pressures and extreme temperatures. C63000 has great galling resistance, making it the material of choice for such applications.

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Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.