UNS C63000 (AMS 4640) – Premium Nickel–Aluminum Bronze Alloy

2.0966 (CuAl10Ni5Fe4) most popular American grade of nickel aluminum bronze with a chemical composition of approximately 10% aluminium, 5% nickel and 3% iron, is readily hot worked and offers a good machinability. The alloy displays good erosion and cavitation resistance in seawater and brackish water, together with a good resistance to dilute sulphuric, hydrochloric and non-oxidising acids. Columbia Metals stocks C63000 in the HR50 condition to meet the requirements of AMS4640. It shows the following features and properties:

Very good strength and toughness

High resistance to corrosion and erosion

Retention of properties at cryogenic temperatures

Excellent resistance to shock, wear and abrasion

Spark resistance

Good fabrication and welding properties

Retention of properties at cryogenic temperatures

Quantity: Depending on material – Contact usAdditional services: Specific treatments, size customisation, co-design

BIKAR-METALLE GMBH

MANUFACTURER AND DISTRIBUTOR

Information and services

Additional services: Cuttings, Parts from drawings

Properties

General

Property	Temperature	Value
Density	23.0 °C	7.6 g/cm³

Mechanical

Property	Temperature	Value
Elongation	23.0 °C	5 - 12 %
Tensile strength	23.0 °C	550 - 760 MPa
Yield strength Rp0.2	23.0 °C	275 - 415 MPa

Thermal

Property	Temperature	Value	Comment
Coefficient of thermal expansion	23.0 °C	1.7E-5 1/K	for 0-300°C
Melting point		1050 - 1070 °C
Thermal conductivity	23.0 °C	38 - 46 W/(m·K)

Electrical

Property	Temperature	Value
Electrical conductivity	23.0 °C	4.06E+6 - 5.22E+6 S/m
Specific Electrical conductivity		7 - 9 % IACS

Magnetic

Property	Temperature	Value
Relative magnetic permeability	23.0 °C	1 [-]

Chemical properties

Property	Value	Comment
Aluminium	9 - 11 %
Copper	Balance
Iron	2 - 4 %
Manganese	1.5 %	max.
Nickel	4 - 5.5 %
Silicon	0.25 %

Technological properties

Property
Application areas	Offshore & marine: Marine fasteners, hardware and fittings;Aerospace: Landing gear components, thrust washers, gears, control bushes, faucet balls, springs and worm wheels;Other: Non-sparking safety tooling, valve stems and seats, wear plates, welding clamps, valve spindles and components, fasteners and bearing bushes
Corrosion properties	High resistance to corrosion and erosion
General machinability	Good machinability
Hot forming	Easily hot worked

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