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Ampco R Series Marine Pump
with Ampco 483 Housing
Ampco 483 – Technical Data
cast aluminum-nickel-iron-copper alloy

Ampco 483 is a cast aluminum-nickel-iron-copper alloy (UNS 95800), commonly called alpha nickel aluminum bronze or propeller bronze.

Uses include: propeller blades and hubs, fittings, pump housings and impellers, gears, worm wheels, valve guides, seals, and structural applications requiring excellent corrosion resistance in both fresh and salt water.

Ampco 483 alloy will maintain mechanical properties at temperatures up to 600°F and has a machinability rating of 50%. The alloy was developed at the request of the U.S. Navy for critical salt-water service and provides excellent corrosion resistance to seawater and non-oxidizing acids. Can be welded with both the gas-shielded and shielded metal-arc processes. Brazing, soldering and oxyfuel gas welding are not recommended.

The microstructure of the as-cast alloy generally consists of continuous equiaxiated alpha crystals with small areas of metastable beta phase. Kappa phase precipitates are found in the alpha phase, in grain boundaries, and in the beta areas. A quench and temper thermal treatment results in refinement and redistribution of the kappa phase throughout a matrix of tempered beta martensite and alpha kappa eutectoid. Ampco 483 castings are always subjected to this thermal treatment to enhance corrosion resistance and eliminate the potential of any de-alloying.

Copper 81.3%
Aluminum 9%
Nickel 4.5%
Iron 4%
Manganese 1.2%

Note: Iron content shall not exceed nickel content.

  Mechanical Properties
Tensile Strength, minimum 85 ksi
Yield Strength, minimum 35 ksi
Elongation, minimum 15% in 2"
Hardness, nominal 163 BHN
Ultimate in Compression 110
Impact: Charpy V-notch 16 ft-lbs
Impact: Charpy Keyhole 10 ft-lbs
Modulus of Elasticity: tension 16,500 ksi
Poisson's Ratio 0.320
Fatigue Strength: rotating beam 33 ksi
  Physical Properties
Density 0.276 lbs/in³
Specific Gravity 7.64
Specific Heat 0.105 Btu/lb °F
Coefficient of Thermal Expansion 9.0 x 10^-6 in/in/°F
Electrical Conductivity 7% IACS
Electrical Resistivity 243 microohms-meter @ 68°F
Thermal Conductivity 21 Btu/ft²/ft/hr/°F
Magnetic Permeability 1.05 16 kA/m
ASTM B-148 C95800
B-271 C95800
B-505 C95800
Federal QQ-C-390 C958
MIL C-15345 Alloy 28
B-21230 Alloy 1
C-22229 Alloy 958
SAE J-462b C95800

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