Wrought Copper-aluminium, Copper-nickel and Copper-nickel-zinc Alloys—Compositions, Properties, Standards and Uses

These tables show the compositions, typical mechanical properties, and relevant BS EN standards for copper-aluminium (aluminium bronze), copper-nickel and copper-nickel-zinc (nickel silver) wrought copper alloys. Information on general characteristics and uses, and machinability, is also provided.

Machinability is shown as a percentage, where free-cutting brass is designated as 100%.

Information is split into two tables, both ordered by description and EN number.

The first table shows compositions—either a range or maximum—and typical uses. Note that not all elements listed as impurities are shown here. For the full chemical composition you should refer to the standard or the Copper and copper alloys. Compendium of compositions and products PD CEN/TS 13388.

The second table indicates typical mechanical properties, machinability (free-cutting brass has a machinability index of 100%) and relevant BS EN standards. The material conditions defined by the standards are given and—where mandatory—this is indicated.

For more detail, the appropriate standard(s) should be consulted. Visit our page with details of standards and links to the BSI shop.

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Wrought Copper-aluminium, Copper-nickel and Copper-nickel-zinc—Compositions and Uses

DescriptionEN
Number
EN
Symbol
Nearest
Old BS
Equiv.
Cu
%
Al
%
Fe
%
Mn
%
Ni
%
Pb
%
Si
%
Zn
%
Others
%
Characteristics and Uses
Copper-aluminium (Aluminium Bronze)CW300GCuAl5As-Rem.4.0-6.50.20.20.20.02-0.30.1-0.4 AsAn alpha phase alloy for tube manufacture. Readily cold worked.
Copper-aluminium (Aluminium Bronze)CW301GCuAl6Si2FeCA107Rem.6.0-6.40.5-0.70.10.10.052.0-2.40.4-Ref Def Stan 02-879 Part 1 Annex D. Controlled low magnetic permeability, < 1.005. MOD. Seawater resistant.
Copper-aluminium (Aluminium Bronze)CW302GCuAl7Si2-Rem.6.3-7.60.30.20.20.051.5-2.20.5-Ref UNS C64200 low magnetic permeability. Seawater resistant.
Copper-aluminium (Aluminium Bronze)CW303GCuAl8Fe3CA106Rem.6.5-8.51.5-3.51.01.00.050.20.5-Seawater resistant. Offshore and marine, fasteners.
Copper-aluminium (Aluminium Bronze)CW304GCuAl9Ni3Fe2CA105Rem.8.0-9.51.0-3.02.52.0-4.00.050.10.2-Seawater resistant. Available as plate.
Copper-aluminium (Aluminium Bronze)CW305GCuAl10Fe1-Rem.9.0-10.00.5-1.50.51.00.020.20.5-Seawater resistant.
Copper-aluminium (Aluminium Bronze)CW306GCuAl10Fe3Mn2-Rem.9.0-11.02.0-4.01.5-3.51.00.050.20.5-High strength alloys for use in aggressive media such as seawater when wear resistance and toughness are needed. Used for pumps, valves, bushes, fasteners.
Copper-aluminium (Aluminium Bronze)CW307GCuAl10Ni5Fe4CA104Rem.8.5-11.03.0-5.01.04.0-6.00.050.20.4-10-5-5 is the most common aluminium-bronze composition in UK, ref Def Stan 02-833 Part 2, high strength.
Copper-aluminium (Aluminium Bronze)CW308GCuAl11Fe6Ni6-Rem.10.5-12.55.0-7.01.55.0-7.00.050.20.5-High strength alloys for use in aggressive media such as seawater when wear resistance and toughness are needed. Used for pumps, valves, bushes, fasteners.
Copper-aluminium (Aluminium Bronze)CW309GCuAl5Zn5Sn1-Rem.4.0-6.0------0.3-1.5 Sn
4.0-6.0 Zn
Sheet and strip for building (EN 1172).
Copper-nickelCW350HCuNi25CN105Rem.-0.30.524.0-26.00.02-0.50.1 CoUK "silver" coinage alloy. Outer ring of 2 Euro coin.
Copper-nickelCW351HCuNi9Sn2-Rem.-0.30.38.5-10.50.030.1-1.8-2.8 SnGood elastic properties for electrical contacts. Tarnish resistant.
Copper-nickelCW352HCuNi10Fe1MnCN102Rem.-1.0-2.00.5-1.09.0-11.00.02-0.50.1 CoExcellent corrosion resistance, reduced attachment of marine organisms. 90/10 alloy is more cost-effective than 70/30. Used for cooling and firewater systems, heat exchangers, condensers and piping, offshore sheathing, desalination, aquaculture, boat hulls.
Copper-nickelCW353HCuNi30Fe2Mn2CN108Rem.-1.5-2.51.5-2.529.0-32.00.02-0.50.1 CoWithstands high flow velocities, excellent seawater resistance, reduced attachment of marine organisms. Used for seawater cooling and firewater systems, heat exchangers, condensers and piping, offshore sheathing, desalination, aquaculture, boat hulls.
Copper-nickelCW354HCuNi30Mn1FeCN107Rem.-0.4-1.00.5-1.530.0-32.00.02-0.50.1 CoExcellent seawater resistance, withstands high flow velocities, reduced attachment of marine organisms. Used for seawater cooling and firewater systems, heat exchangers, condensers and piping, offshore sheathing, desalination, aquaculture, boat hulls.
Copper-nickel-zinc (Nickel Silver)CW400JCuNi7Zn39Pb3Mn2-47.0-50.0-0.31.5-3.06.0-8.02.3-3.3-Rem. -Two-phase, alpha-beta alloys, when hot formability is required for production of forgings or hot extruded architectural profiles. Used for tableware, telecommunication components, decorative building, musical instruments and food manufacturing equipment.
Copper-nickel-zinc (Nickel Silver)CW401JCuNi10Zn27NS10361.0-64.0-0.30.59.0-11.00.05-Rem. -Alpha phase alloys with good corrosion resistance. Colour becomes whiter as nickel content increases. Used for tableware, telecommunication components, decorative building, musical instruments and food manufacturing equipment.
Copper-nickel-zinc (Nickel Silver)CW402JCuNi10Zn42Pb2NS10145.0-48.0-0.30.59.0-11.01.0-2.5-Rem. -Two-phase, alpha-beta alloys, when hot formability is required for production of forgings or hot extruded architectural profiles. Used for tableware, telecommunication components, decorative building, musical instruments and food manufacturing equipment.
Copper-nickel-zinc (Nickel Silver)CW403JCuNi12Zn24NS10463.0-66.0-0.30.511.0-13.00.03-Rem. -Alpha phase alloys with good corrosion resistance. Colour becomes whiter as nickel content increases. Used for tableware, telecommunication components, decorative building, musical instruments and food manufacturing equipment.
Copper-nickel-zinc (Nickel Silver)CW404JCuNi12Zn25Pb1NS11160.0-63.0-0.30.511.0-13.00.5-1.5-Rem. -Alpha phase alloys with good corrosion resistance. Colour becomes whiter as nickel content increases. Lead improves machinability. Used for tableware, telecommunication components, decorative building, musical instruments and food manufacturing equipment.
Copper-nickel-zinc (Nickel Silver)CW405JCuNi12Zn29-57.0-60.0-0.30.511.0-13.50.03-Rem. -Alpha phase alloys with good corrosion resistance. Colour becomes whiter as nickel content increases. Used for tableware, telecommunication components, decorative building, musical instruments and food manufacturing equipment.
Copper-nickel-zinc (Nickel Silver)CW406JCuNi12Zn30Pb1-56.0-58.0-0.30.511.0-13.00.5-1.5-Rem. -Alpha phase alloys with good corrosion resistance. Colour becomes whiter as nickel content increases. Lead improves machinability. Used for tableware, telecommunication components, decorative building, musical instruments and food manufacturing equipment.
Copper-nickel-zinc (Nickel Silver)CW407JCuNi12Zn38Mn5Pb2-42.0-45.0-0.34.5-6.011.0-13.01.0-2.5-Rem. -Two-phase, alpha-beta alloys, when hot formability is required for production of forgings or hot extruded architectural profiles. Used for tableware, telecommunication components, decorative building, musical instruments and food manufacturing equipment.
Copper-nickel-zinc (Nickel Silver)CW408JCuNi18Zn19Pb1NS11359.5-62.5-0.30.717.0-19.00.5-1.5-Rem. -Alpha phase alloys with good corrosion resistance. Colour becomes whiter as nickel content increases. Lead improves machinability. Used for tableware, telecommunication components, decorative building, musical instruments and food manufacturing equipment.
Copper-nickel-zinc (Nickel Silver)CW409JCuNi18Zn20NS10660.0-63.0-0.30.517.0-19.00.03-Rem. -Alpha phase alloys with good corrosion resistance. Colour becomes whiter as nickel content increases. Used for tableware, telecommunication components, decorative building, musical instruments and food manufacturing equipment.
Copper-nickel-zinc (Nickel Silver)CW410JCuNi18Zn27NS10753.0-56.0-0.30.517.0-19.00.03-Rem. -Alpha phase alloys with good corrosion resistance. Colour becomes whiter as nickel content increases. Used for tableware, telecommunication components, decorative building, musical instruments and food manufacturing equipment.
Wrought Copper-aluminium,
Copper-nickel and
Copper-nickel-zinc alloys
—Compositions and Uses
copperalliance.org.uk

Table Notes:
Compositions are given as either a range or a maximum.

Wrought Copper-aluminium, Copper-nickel and Copper-nickel-zinc—Properties and Standards

DescriptionEN
Number
EN
Symbol
Nearest
Old BS
Equiv.
0.2% Proof Strength (N/mm2)Tensile Strength (N/mm2)Elong-
ation (%)
Hardness (HV)Machin-
ability
index
(%)
1652
Plate, Strip, Sheet, Circles
For general purposes
1653
Plate, Sheet, Circles
For boilers, pressure vessels and hot water storage units
1654
Strip for Springs, Connectors
12163
Rod
For general purposes
12165
Forging Stock
12166
Wire
12167
Profiles, Rectangular Bar
For general purposes
12420
Forgings
12449
Tubes
For general purposes
12451
Tubes for Heat Exchangers
12452
Finned
Tubes for
Heat
Exchangers
Characteristics and Uses
Copper-aluminium (Aluminium Bronze)CW300GCuAl5As110 Min380 Min 30 Min75-10020HRAn alpha phase alloy for tube manufacture. Readily cold worked.
Copper-aluminium (Aluminium Bronze)CW301GCuAl6Si2FeCA107250-350500-650 25-10125-16050Ref DEF STAN 02-834. Controlled low magnetic permeability, < 1.005. MOD. Seawater resistant.
Copper-aluminium (Aluminium Bronze)CW302GCuAl7Si2250-350500-650 25-10125-16050Ref UNS C64200 low magnetic permeability. Seawater resistant.
Copper-aluminium (Aluminium Bronze)CW303GCuAl8Fe3CA106180-210460-500 30125-13520HRRHMXSeawater resistant. Offshore and marine. Fasteners.
Copper-aluminium (Aluminium Bronze)CW304GCuAl9Ni3Fe2CA105180500 3012520RSeawater resistant. Available as plate.
Copper-aluminium (Aluminium Bronze)CW305GCuAl10Fe1210-480420-670 22-5110-20520HMRHMHMRXSeawater resistant.
Copper-aluminium (Aluminium Bronze)CW306GCuAl10Fe3Mn2330-510600-720 15-5130-21030HMXHigh strength alloys for use in aggressive media such as seawater when wear resistance and toughness are needed. Pumps, valves, bushes, fasteners.
Copper-aluminium (Aluminium Bronze)CW307GCuAl10Ni5Fe4CA104400-530600-760 15-5170-22030RHMRHMHMRX10-5-5 most common in UK, ref DEF-STAN 02-833, high strength.
Copper-aluminium (Aluminium Bronze)CW308GCuAl11Fe6Ni6500-680750-850 10-5200-26030HMRHMHMRXHigh strength alloys for use in aggressive media such as seawater when wear resistance and toughness are needed. Pumps, valves, bushes, fasteners.
Copper-aluminium (Aluminium Bronze)CW309GCuAl5Zn5Sn1170 Min 400 Min 45 Min 80 MinSheet, strip building EN 1172
Copper-nickelCW350HCuNi25CN105120 Min300 Min70-10020HRUK "silver" coinage alloy. Outer ring of 2 Euro coin.
Copper-nickelCW351HCuNi9Sn2200-550350-620 45-280-22020HRBHRGood elastic properties for electrical contacts. Tarnish resistant.
Copper-nickelCW352HCuNi10Fe1MnCN102100-420290-520 35-880-16020HRRHMRHMXHRHRHR90/10 less expensive than 70/30. Reduced attachment of marine organisms. Excellent corrosion resistance. Cooling and firewater systems, heat exchangers, condensers and piping, offshore sheathing, desalination, aquaculture, boat hulls.
Copper-nickelCW353HCuNi30Fe2Mn2CN108175450 3511020HRReduced attachment of marine organisms. Excellent seawater resistance. Seawater cooling and firewater systems, heat exchangers, condensers and piping, offshore sheathing, desalination, aquaculture,boat hulls.withstands high flow velocities.
Copper-nickelCW354HCuNi30Mn1FeCN107130-330350-520 35-1290-13020HRRHMRHMXHRHRHRReduced attachment of marine organisms. Excellent seawater resistance. Seawater cooling and firewater systems, heat exchangers, condensers and piping, offshore sheathing, desalination, aquaculture,boat hulls.withstands high flow velocities.
Copper-nickel-zinc (Nickel Silver)CW401JCuNi10Zn27NS103180-880360-880 50-280-21030GHRAlpha phase alloys with good corrosion resistance. Colour becomes whiter as nickel content increases. Tableware, telecommunication components, decorative building, musical instruments and food manufacturing equipment.
Copper-nickel-zinc (Nickel Silver)CW403JCuNi12Zn24NS104180-800360-880 50-280-21030GHRHRHMRGHMRHMRHRAlpha phase alloys with good corrosion resistance. Colour becomes whiter as nickel content increases. Tableware, telecommunication components, decorative building, musical instruments and food manufacturing equipment.
Copper-nickel-zinc (Nickel Silver)CW404JCuNi12Zn25Pb1NS111260-650380-730 20-2110-21075HRAlpha phase alloys with good corrosion resistance. Colour becomes whiter as nickel content increases. Lead improves machinability. Tableware, telecommunication components, decorative building, musical instruments and food manufacturing equipment.
Copper-nickel-zinc (Nickel Silver)CW405JCuNi12Zn29450-720520-820 4-2170-24030HRAlpha phase alloys with good corrosion resistance. Colour becomes whiter as nickel content increases. Tableware, telecommunication components, decorative building, musical instruments and food manufacturing equipment.
Copper-nickel-zinc (Nickel Silver)CW406JCuNi12Zn30Pb1300-440410-550 15-2110-19080HMRHMRAlpha phase alloys with good corrosion resistance. Colour becomes whiter as nickel content increases. Lead improves machinability. Tableware, telecommunication components, decorative building, musical instruments and food manufacturing equipment.
Copper-nickel-zinc (Nickel Silver)CW408JCuNi18Zn19Pb1NS113320-460450-600 15-2120-20075HMRHMRAlpha phase alloys with good corrosion resistance. Colour becomes whiter as nickel content increases. Lead improves machinability. Tableware, telecommunication components, decorative building, musical instruments and food manufacturing equipment.
Copper-nickel-zinc (Nickel Silver)CW409JCuNi18Zn20NS106200-800380-900 40-285-23030GHRBHRHMRGHMRHMRHRAlpha phase alloys with good corrosion resistance. Colour becomes whiter as nickel content increases. tableware, telecommunication components, decorative building, musical instruments and food manufacturing equipment.
Copper-nickel-zinc (Nickel Silver)CW410JCuNi18Zn27NS107280-680400-820 45-290-23030HRHRAlpha phase alloys with good corrosion resistance. Colour becomes whiter as nickel content increasestableware, telecommunication components, decorative building, musical instruments and food manufacturing equipment.
Copper-nickel-zinc (Nickel Silver)CW400JCuNi7Zn39Pb3Mn2250-620460-720 20-2120-22090HMHMRHMRXTwo-phase, alpha-beta alloys for similar applications to those above but for use when hot formability is required for production of forgings or hot extruded architectural profiles.
Copper-nickel-zinc (Nickel Silver)CW402JCuNi10Zn42Pb2NS101250-500460-660 15-2120-22090Two-phase, alpha-beta alloys for similar applications to those above but for use when hot formability is required for production of forgings or hot extruded architectural profiles.
Copper-nickel-zinc (Nickel Silver)CW407JCuNi12Zn38Mn5Pb2400-450600-660 8165-19080Two-phase, alpha-beta alloys for similar applications to those above but for use when hot formability is required for production of forgings or hot extruded architectural profiles.
Wrought Copper-aluminium,
Copper-nickel and
Copper-nickel-zinc
—Properties and Standards
copperalliance.org.uk

Table Notes:
1652, 12163 and 12449 are for general purposes.
1653 is for boilers, pressure vessels and hot water storage units.
1N/mm2 = 1MPa

B – mandatory spring bending limit
G – mandatory grain size
H – mandatory hardness
M – as manufactured
R – mandatory tensile strength
X – no mandatory tensile properties