Copper Alloys, Aluminium BronzeAMS 4640 (C63000) Bar & Forgings

American nickel aluminium bronze grade designed as an equivalent to European grades.

AMS4640/C63000 is perhaps the most common of the American grades of nickel aluminium bronze. Containing aluminium (10%), nickel (5%) and iron (3%), with copper making up the balance, AMS4640/C63000 alloy demonstrates an exceptional balance of high strength and high hardness with excellent resistance to abrasion and wear. AMS4640/C63000 is also spark resistant, making it widely used in environments where DSEAR applies.

AMS464/C63000 also offers a very good corrosion, erosion and cavitation resistance in seawater and brackish water together with a good resistance to dilute sulphuric, hydrochloric and non-oxidising acids. It also has a very good galling resistance and also offers a high retention of mechanical properties at elevated temperatures.

AMS4640 is available in rod and forged form.

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Related Specifications

AMS 4625
UNS C63000
ASTM B150

Properties

Chemical Composition

Chemical Element	% Present
Iron (Fe)	0.00 - 3.70
Manganese (Mn)	0.00 - 0.30
Aluminium (Al)	0.00 - 10.00
Nickel (Ni)	0.00 - 4.80
Copper (Cu)	Balance

Mechanical Property	Value
Elongation A50 mm	12-25 %
Hardness Rockwell B	180-240 HRB

Physical Property	Value
Density	7.58 g/cm³
Melting Point	1049-1071 °C

Applications

Marine fasteners, hardware and fittings
Aerospace landing gear components, thrust washers, gears, control bushes, faucet balls, springs & worm wheels
Non-sparking safety tools
Valve stems and seats
Wear plates
Welding clamps
Valve spindles and components
Fasteners
Bearing bushes

Characteristics

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
Anti-galling

Additional Information

Joining Methods

Process	Rating
Soldering	Not Recommended
Brazing	Fair
MIG Welding	Good
TIG Welding	Good
Resistance Welding	Good

Property	Rating
Stress Relieving Temperature	300-400 deg C
Hot Working Temperature	850-975 deg C
Hot Formability	Good
Cold Formability	Limited
Machinability Rating	20%

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Disclaimer

This Data is indicative only and as such is not to be relied upon in place of the full specification. In particular, mechanical property requirements vary widely with temper, product and product dimensions. All information is based on our present knowledge and is given in good faith. No liability will be accepted by the Company in respect of any action taken by any third party in reliance thereon. Please note that the 'Datasheet Update' date shown above is no guarantee of accuracy or whether the datasheet is up to date.

The information provided in this datasheet has been drawn from various recognised sources, including EN Standards, recognised industry references (printed S online) and manufacturers' data. No guarantee is given that the information is from the latest issue of those sources or about the accuracy of those sources. Material supplied by the Company may vary significantly from this data but will conform to all relevant and applicable standards. As the products detailed may be used for a wide variety of purposes and as the Company has no control over their use; the Company specifically excludes all conditions or warranties expressed or implied by statute or otherwise as to dimensions, properties and/or fitness for any particular purpose, whether expressed or implied. Advice given by the Company to any third party is given for that party's assistance only and without liability on the part of the Company. All transactions are subject to the Company's current Conditions of Sale. The extent of the Company's liabilities to any customer is clearly set out in those Conditions; a copy of which is available on request.