Brass Forgings, Stampings and Hot Pressings

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.

Brasses for hot stamping combine maximum ductility at the stamping temperature to allow complex shapes to be formed, with strength and reasonable ductility at room temperature.

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 brasses previously included in BS 2872 ‘Specification for copper and copper alloy forging stock and forgings’.

These brasses are now included in the following EN standards for individual product forms:

  • EN 12420 ‘Copper and copper alloys—Forgings’
  • EN 12165 ‘Copper and copper alloys—Wrought and unwrought forging stock’

In the Table below, the mechanical properties are taken from EN 12420. Tensile properties are for information only. Hardness values in EN 12165 may be slightly different and are given as minima.

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

How to use this table

  • Notes: please read these, at the foot of the table.
  • Column visibility button: click for drop down of column headings, and click on the column/s that you wish to hide.
  • Search: search just within the table.
  • Show entries: use this to change number of rows visible.
  • Print: this will print a portrait version of the table (use ‘Column Visibility’ to hide columns, as required). The notes at the foot of the table will not be printed.
  • Green + button: click to view more columns.

Brass Forgings, Stampings and Hot Pressings—Compositions, Properties and Standards

EN
Number
EN
Symbol
Nearest
Old BS
Equiv.
Cu
%
Al
%
Fe
%
Mn
%
Pb
%
Others
%
Zn
%
0.2%
Proof
Strength
(N/mm2)
Tensile
Strength
(N/mm2)
Elongation
%
Hardness
(HB)
Remarks
CW508LCuZn37CZ10862.0-64.00.050.10.10.3 Ni
0.1 Sn
Rem.1003002070Good hot working and excellent cold working capacity. Machinable with slow speeds and feeds. Uses include brass fitting and decorative components via general copper smithing work.
CW509LCuZn40CZ10959.0-61.50.050.20.20.3 Ni
0.2 Sn
Rem.10030020100Excellent hot formability and good cold working CW509L is fully-compliant with Californian drinking regulation AB1953 and perfectly matching with the UNS C27450. Ideal for drinking water fittings and architectural metalwork. Approved for drinking water contact under 4MS.
CW510LCuZn42 57.0-59.00.050.3 0.2 0.3 Ni
0.3 Sn
Rem.1403501595Offers a good machinability, index 50% with a very low lead content <0.2%. This makes it suitable for drinking water applications in the USA under AB1953 and fully meets the UNS C27450. It also offers excellent hot workability making it ideal for fittings, valves and valve bodies for both water and gas. Approved for drinking water contact under 4MS.
CW511LCuZn38As 61.5-63.50.05 0.1 0.2 0.02-0.15 As
0.3 Ni
0.1 Sn
Rem.1202802070Offers a good machinability, index 50% with a very low lead content <0.2%, an excellent resistance to stress corrosion cracking and can also offer a resistance to dezincification (subject to heat treatment). It is fully compliant with the Californian drinking water regulations AB1953, as well as with the NSF/ANSI Standard 14 with reference to dezincification and stress corrosion resistance. Approved for drinking water contact under 4MS.
CW602NCuZn36Pb2AsCZ13261.0-63.00.05 0.10.11.7-2.80.02-0.15 As
0.3 Ni
0.1 Sn
Rem.1202802075The traditional dezincification resistant brass is a duplex brass that can be hot worked and machined. A simple heat treatment gives a very high level of dezincification resistance and is traditionally utilised for components in water or fluid handling systems.
CW607NCuZn38Pb160.0-61.00.050.20.8-1.60.3 Ni
0.2 Sn
Rem.1403501570A duplex brass offering a combination of excellent hot workability, very good machinability, index 85% and a good cold formability so is ideal for use for applications where 2 or more operations are required.
CW608N CuZn38Pb2CZ12860.0-61.0
0.050.21.6-2.5
0.3 Ni
0.2 Sn
Rem.
14035015100A leaded brass alloy sometimes referred to as engraving brass due to its excellent machinability. Similar to the CW612N it offers very good hot formability and often finds use in applications such as plaques, nameplates, clock and instrument cases, watch parts, gears, cams and decorative metalwork where precision machining is essential.
CW610NCuZn39Pb0.5CZ13759.0-60.50.050.20.2-0.80.3 Ni
0.2 Sn
Rem.Not
given
Not
given
Not
given
70-100A leaded Muntz Metal this grade offers a good hot  formability and has a small addition of lead to improve machinability levels.  Often used for condenser and heat exchanger tube plates, and decorative brassware.
CW611NCuZn39Pb1CZ12959.0-60.00.050.20.8-1.60.3 Ni
0.2 Sn
Rem.Not
given
Not
given
Not
given
70-100A leaded Brass with a medium lead content that retains a very good machinability and an excellent hot workability but also offers a good cold formability. Sometimes referred to as bending brass this grade is often used where both forming and machining is required for the finished component.
CW612NCuZn39Pb2CZ12859.0-60.00.050.31.6-2.50.3 Ni
0.3 Sn
Rem.14035015100Similar to the CW608N this grade is also referred to as engraving brass due to its lead content and excellent machinability. It also offers very good hot formability and the slightly increased tin content can improve corrosion resistances. Used for engraving applications, clock and instrument cases, watch parts, gears, cams and decorative metalwork where precision machining is essential. Cannot be acid etched due to Duplex microstructure. Approved for drinking water contact under 4MS.
CW613NCuZn39Pb2Sn59.0-60.00.10.41.6-2.50.3 Ni
0.2-0.5 Sn
Rem1403501570Similar to the CW612N, but the CW613N allows higher impurity levels which can reduce the material machining speeds slightly. Still has a very high machinability, a good hot formability and good corrosion resistance. Often used for decorative metalwork and builders hardware
CW614NCuZn39Pb3CZ121-Pb357.0-59.00.050.32.5-3.50.3 Ni
0.3 Sn
Rem14035015100A leaded brass know as Free Machining Brass. This is the brass against which the machinability of all other copper based alloys are compared. Having the highest machinability rating of 100% this is utilised for many components including bushings, bearings and extruded sections. Hot formability is fair but cold working is not recommended. Approved for drinking water contact under 4MS.
CW616NCuZn40Pb1Al57.0-59.00.05-0.300.21.0-2.00.2 Ni
0.2 Sn
Rem1403501570A forging or hot stamping brass with a small addition of aluminium to improve die forging and give a brighter more attractive golden brass colour. As its name suggests an excellent hot workable grade with a very good machinability, index 95%. Often used for builders hardware and architectural applications.
CW617NCuZn40Pb2CZ12257.0-59.00.050.31.6-2.50.3 Ni
0.3 Sn
Rem.14035015100Often referred to as stamping brass  due to its excellent hot formability this grade also offers a very high machinability rating thanks to its lead content. Commonly utilized for the production of complex hot pressed components, valves bodies and fittings. Approved for drinking water contact under 4MS.
CW625N CuZn35Pb1.5AlAs 62.0-64.00.5-0.70.3 0.1 1.2-1.60.02-0.15 As
0.2 Ni
0.3 Sn
Rem.1202802070When suitably heat treated these dezincification resistant brasses can be used as an alternative to CW602N. They offer a good machinability and good hot and cold working properties and are used for components in contact with water intended for human consumption. Both are approved by the 4MS Standard for drinking water and also meet ISO 6509 requirements for the dezincification resistance. Approved for drinking water contact under 4MS.
CW626NCuZn33Pb1.5AlAs 64.0-66.00.8-1.00.3 0.1 1.2-1.70.02-0.15 As
0.2 Ni
0.3 Sn
Rem.1202802070When suitably heat treated these dezincification resistant brasses can be used as an alternative to CW602N. They offer a good machinability and good hot and cold working properties and are used for components in contact with water intended for human consumption. Both are approved by the 4MS Standard for drinking water and also meet ISO 6509 requirements for the dezincification resistance. Approved for drinking water contact under 4MS.
CW704RCuZn23Al6Mn4Fe3Pb63.0-65.05.0-6.02.0-3.53.5-5.00.2-0.80.5 Ni
0.2 Sn
Rem.5007005190 A high tensile brass with additions of aluminium (far in excess of standard high tensile brasses) manganese and iron to give higher hardness and increased corrosion resistance levels. Good hot workability and machinability with uses including heat pump and valve trim, heavy duty bearing bushes. No tensile properties shown in EN 12165 and no hardness property shown in EN 12420.
CW709RCuZn32Pb2AsFeSi64.0-66.50.050.1-0.21.5-2.20.03-0.08 As
0.3 Ni
0.45-0.8 Si
0.3 Sn
Rem.1603501570A hot workable duplex brass that offers free machining. It also has an arsenic content that can offer very good dezincification resistance making it suitable for components within marine applications or those which come into contact with water.
CW710RCuZn35Ni3Mn2AlPb58.0-60.00.3-1.30.51.5-2.50.2-0.82.0-3.0 Ni
0.5 Sn
Rem.18044010120-160A high tensile brass with additions of aluminium, nickel and manganese The CW710R offers a good machinability, is hot formable and also offers a fair cold formability. The material also offers a good overall corrosion and wear resistance and is utilised for highly loaded bearings, slide- & wear-plates, valve guides and piston parts.
CW712RCuZn36Sn1PbCZ11261.0-63.00.10.2-0.60.2 Ni
1.0-1.5 Sn
Rem.16035015110Often referred to as Naval brass CW712R is a duplex brass with 1% addition of tin to give an improved corrosion resistance in marine applications. Good hot formability and machinability this grade lends itself to many marine, and offshore applications together with more exposed architectural metalwork.
CW713RCuZn37Mn3Al2PbSiCZ13557.0-59.01.3-2.311.5-3.00.2-0.81.0 Ni
0.3-1.3 Si
0.4 Sn
Rem.2005508150A high tensile brass which is alloyed with aluminium, manganese and silicon. This grade has a good corrosion and erosion resistance and an excellent wear resistance. Can be readily hot stamped and offers a good machinability. Used for high strength bearings, slide- & wear-plates, components in gear boxes
CW719RCuZn39Sn159.0-61.00.10.20.2 Ni
0.5-1.0 Sn
Rem.1603501570A low lead naval brass with good hot workability, reasonable cold formability but a lower level of machinability to the CW712R.  With very good corrosion resistance levels similar to that of the CW712R this grade can be utilised for components in heat exchangers, valves and condensers.
CW720RCuZn40Mn1Pb1CZ13657.0-59.00.20.30.5-1.51.0-2.00.6 Ni
0.3 Sn
Rem.1603501590A Manganese bronze that is used primarily for architectural applications as the manganese leads to the formation of an attractive chocolate brown colouration. It offers a very good hot formability and machinability but is not as high in strength as some of the other manganese bronzes due to lower alloying additions
CW721RCuZn40Mn1Pb1AlFeSnCZ11457.0-59.00.3-1.30.2-1.20.8-1.80.8-1.60.3 Ni
0.2-1.0 Sn
Rem.18044010110A high tensile brass or manganese bronze the CW721R has additions of aluminium, iron, tin and manganese to improve strength and corrosion resistances. It has a very good hot working capacity and a good machinability rating. Often used for valves and fittings, pump trim, gears, transmission components, marine hardware and decorative metalwork.
CW722RCuZn40Mn1Pb1FeSnCZ11556.5-58.50.10.2-1.20.8-1.80.8-1.60.3 Ni
0.2-1.0 Sn
Rem.18044010110A high tensile brass similar in nature to the CW721R but with a restricted aluminium content to allow for better joining properties.
CW724R CuZn21Si3P 75.0-77.00.05 0.3 0.05 0.1 00.2 Ni
0.02-0.10 P
2.7-3.5 Si
0.3 Sn
Rem.25050015110A free machining brass without the addition of lead. This alloy offers a very good machinability and a good hot formability.  The CW724 Alloy also meets the ISO 6509 requirements regarding dezincification resistance and complies with UBA Hygienic list. Approved for drinking water contact under 4MS.
CW725R CuZn33Pb1AlSiAs 64.0-67.00.1-0.40.3 0.1 0.4-0.90.05-0.08 As
0.2 Ni
0.1-0.3 Si
0.3 Sn
Rem.1202802070A dezincification resistant brass developed to meet 4MS drinking water requirements. The material offers very good machinability and an ability to be hot worked and stamped. With mechanical properties and the machinability comparable to CW602N it is also dezincification resistant to ISO 6509 after heat treatment. Approved for drinking water contact under 4MS.
Brass forgings,
stampings and
hot pressings 
copperalliance.org.uk

Table Notes:
Compositions are given as either a range or a maximum.
Mechanical properties are taken from EN 12420. Tensile properties are for information only. Hardness values in EN 12165 may be slightly different and are given as ranges.
1N/mm2 = 1MPa