Brass Rods and Sections—Compositions, Properties and Standards

Brasses are a very versatile family of alloys. Based on copper-zinc, additional alloying elements can be used to increase strength, improve corrosion resistance (especially with respect to seawater) and to improve machinability.

The typical mechanical properties shown, apply to rod for free machining and general purposes which can have significant cold drawing after extrusion.

The values represent those typically required rather than the limits that are possible. Products such as hollows and profiles which are not normally significantly cold drawn will have the lower end of the range for proof stress, tensile strength and hardness and will have good elongation values.

Compositions given are the EN materials appropriate to designation number. Composition ranges may be outside those of previous BS specifications, therefore compliance should be checked before assuming suitability for applications. The compositions are shown as either a range or maximum for individual elements. 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.

This table includes materials previously included in BS 2874 ‘Specification for copper and copper alloy rods and sections (other than forging stock)’. These materials are now included in the following EN standards for individual product forms:

  • EN 12163 Copper and copper alloys—Rod for general purposes
  • EN 12164 Copper and copper alloys—Rod for free machining purposes
  • EN 12167 Copper and copper alloys—Profiles and rectangular bar for general purpose
  • EN 12168 Copper and copper alloys—Hollow rod for free machining purposes

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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Brass Rods and Sections—Compositions, Properties and Standards

EN
Number
EN
Symbol
Nearest
Old BS
Equiv.
Cu
%
Al
%
Fe
%
Mn
%
Pb
%
Si
%
Others
%
Zn
%
0.2%
Proof
Strength
(N/mm2)
Tensile
Strength
(N/mm2)
Elongation
%
Hardness
(HV)
Remarks   
CW503LCuZn20CZ10379.0-81.00.020.05-0.05-0.3 NiRem.90-460340-65050-570-170Can be deformed extensively by cold working.
CW505LCuZn30CZ10669.0-71.00.020.05-0.05-0.3 NiRem.90-480370-77055-370-190Can be deformed extensively by cold working.
CW507LCuZn36CZ10763.5-65.50.020.05-0.05-0.3 NiRem.90-480370-77055-370-190Can be deformed extensively by cold working.
CW509LCuZn40CZ10959.0-61.50.050.2-0.2-0.3 NiRem.120-280340-46045-2590-15060/40 brass will withstand limited amount of cold working and bending.
CW510LCuZn42 -57.0-59.00.050.3 -0.2 -0.3 NiRem.220-350360-50020-295-170Lead-free, machinability index 50%.
CW511LCuZn38As -61.5-63.50.050.1 -0.2 0.02-0.15 As
0.3 Ni
Rem.200-250280-40030-870-135Dezincification resistant.
CW601N CuZn35Pb2 CZ131
62.0-63.5
0.050.1 -1.6-2.5
-0.3 NiRem. 140-450
330-570
45-5
70-160
The higher copper and lower lead contents of these alloys improves ductility while retaining free machining characteristics. Can be used for cold heading, extreme riveting. Also known as free cutting brass.
CW602NCuZn36Pb2AsCZ13261.0-63.00.050.1 0.11.7-2.80.02-0.15 As
0.3 Ni
Rem.110-140310-37045-3570-80Brass with good hot ductility which is then heat treated to give excellent resistance to dezincification.
CW603NCuZn36Pb3CZ12460.0-62.00.050.3-2.5-3.5-0.3 NiRem.140-320340-52040-570-160Excellent machinability combined with sufficient ductility for some cold work. Also known as free cutting brass.
CW606NCuZn37Pb2CZ131
61.0-62.00.050.2-1.6-2.5
-0.3 NiRem. 140-450
330-570
45-5
70-160
The higher copper and lower lead contents of these alloys improves ductility, while retaining free machining characteristics. Can be used for cold heading, riveting. Also known as free cutting brass.
CW608NCuZn38Pb2CZ12060.0-61.00.050.2-1.6-2.5-0.3 NiRem.140-320340-52040-1590-160Excellent machinability combined with sufficient ductility for some cold work. Also known as free cutting brass.
CW610NCuZn39Pb0.5CZ137
59.0-60.50.050.2-0.2-0.8-0.3 NiRem.120-280340-46045-2590-15060/40 brass will withstand limited amount of cold working and bending.
CW611NCuZn39Pb1CZ12959.0-60.00.050.2-0.8-1.6-0.3 NiRem.120-280340-46045-2090-140The higher copper and lower lead contents of these alloys improves ductility, while retaining free machining characteristics. Can be used for cold heading, riveting. Also known as free cutting brass.
CW612NCuZn39Pb2CZ12859.0-60.00.050.3-1.6-2.5-0.3 NiRem140-320

340-520
40-15
90-160
Excellent machinability combined with sufficient ductility for some cold work. Also known as free cutting brass.
CW614NCuZn39Pb3CZ121-Pb357.0-59.00.050.3-2.5-3.5-0.3 NiRem.110-260370-46035-1590-160The most suitable material for high-speed machining, but has limited ability to be cold worked. The hardness of sections is typically 115 HV.
CW617NCuZn40Pb2CZ12257.0-59.00.050.3-1.6-2.5-0.3 NiRem.140-310350-54040-1590-160Excellent machinability combined with sufficient ductility for some cold work. Standard hot forging brass. Also known as free cutting brass.
CW623N CuZn43Pb2CZ13055.0-57.0
0.050.3-1.6-3.0
-0.3 NiRem. 160-200
370-430
35-25
90-120
The aluminium containing alloy has a bright yellow colour on the surface of extruded sections, while the manganese containing alloy may be toned to a chocolate brown colour. This brass gives an accentuated uniform improvement to natural oxidation effects and is used for architectural sections.
CW624NCuZn43Pb2AlCZ13055.0-57.0
0.05-0.50.3-1.6-3.0
-0.3 NiRem. 160-200
370-430
35-25
90-120
The aluminium containing alloy has a bright yellow colour on the surface of extruded sections, while the manganese containing alloy may be toned to a chocolate brown colour. This brass gives an accentuated uniform improvement to natural oxidation effects and is used for architectural sections.
CW625N CuZn35Pb1.5AlAs -62.0-64.00.5-0.70.3 0.1 1.2-1.6-0.02-0.15 As
0.2 Ni
Rem.200-250280-40030-570-135Dezincification resistant. Approved for drinking water contact under 4MS.
CW626NCuZn33Pb1.5AlAs -64.0-66.00.8-1.00.3 0.1 1.2-1.7-0.02-0.15 As
0.2 Ni
Rem.200-250280-40030-570-135Dezincification resistant. Approved for drinking water contact under 4MS.
CW705RCuZn25Al5Fe2Mn2PbCZ11665.0-68.04.0-5.00.5-3.00.5-3.00.2-0.8-1.0 NiRem.420-490690-77020-15170-220The alloying additions produce improved mechanical properties. Lead improves machinability. Used for fasteners, valve parts.
CW707RCuZn30AsCZ105 and CZ12669.0-71.00.020.050.10.07-0.02-0.06 AsRem.110-170200-35055-2070-90Brass with good hot ductility which is then heat treated to give excellent resistance to dezincification. The addition of arsenic to 70/30 brass improves resistance to corrosion.
CW711RCuZn36Pb2Sn1CZ13459.5-61.5-0.1-1.3-2.2-0.5-1.0 Sn
0.3 Ni
Rem.125-170340-40040-20100-150Tin improves corrosion resistance, especially in sea water. Lead improves machinability. Also known as leaded Naval Brass.
CW712RCuZn36Sn1PbCZ11261.0-63.0-0.1-0.2-0.6-1.0-1.5 Sn
0.2 Ni
Rem.125-185340-43040-20100-160Tin improves corrosion resistance, especially in sea water. Lead improves machinability. Also known as Naval Brass.
CW713RCuZn37Mn3Al2PbSiCZ13557.0-59.01.3-2.31.01.5-3.00.2-0.80.3-1.31.0 NiRem.230-340500-70010-5150-200The alloying additions produce improved mechanical properties. Lead improves machinability. Used for fasteners and valve parts. Silicon addition gives added wear resistance.
CW719RCuZn39Sn1CZ13359.0-61.0-0.1-0.2-0.5-1.0 Sn
0.2 Ni
Rem.155-280400-46030-20100-145Tin improves corrosion resistance, especially in sea water. Also known as uninhibited Naval Brass.
CW720RCuZn40Mn1Pb1CZ13657.0-59.00.20.30.5-1.51.0-2.00.10.6 NiRem.125-200340-50040-3080-115The aluminium containing alloy has a bright yellow colour on the surface of extruded sections, while the manganese containing alloy may be toned to a chocolate brown colour. This brass gives an accentuated uniform improvement to natural oxidation effects and is used for architectural sections.
CW721RCuZn40Mn1Pb1AlFeSnCZ11457.0-59.00.3-1.30.2-1.20.8-1.80.8-1.60.2-1.0 Sn
0.3 Ni
Rem.230-340430-59030-20110-175The alloying additions produce improved mechanical properties. Lead improves machinability. Used for fasteners and valve parts.
CW722RCuZn40Mn1Pb1FeSnCZ11556.5-58.50.10.2-1.20.8-1.80.8-1.60.2-1.0 Sn
0.3 Ni
Rem.230-340430-59030-20110-175The alloying additions produce improved mechanical properties. Lead improves machinability. Used for fasteners and valve parts.
CW724R CuZn21Si3P -75.0-77.00.05 0.3 0.05 0.102.7-3.50.2 Ni
0.02-0.10 P
Rem.350-450500-65015-10110-210Lead-free brass.
CW725R CuZn33Pb1AlSiAs -64.0-67.00.1-0.40.3 0.1 0.4-0.90.1-0.30.05-0.08 As
0.2 Ni
Rem.200-250290-40030-870-135Dezincification resistant. Approved for drinking water contact under 4MS.
Brass rods and sections—Compositions, Properties and Standardscopperalliance.org.uk

Table Notes:
Compositions are given as either a range or a maximum.
1N/mm2 = 1MPa