BRASS ALLOYS

 
 

Leaded Brass


Lead brasses are used for their high machinability and atmospheric corrosion resistance. The machinability of brass is increased by the addition of lead because it acts as a microscopic chip breaker and tool lubricant. The leaded brasses are used for copper base screw machine material. The alloys have excellent machinability, good strength and corrosion resistance. Lead can be added to any brass to increase machinability and provide pressure tightness by sealing the shrinkage pores. There are low, medium and high leaded brasses, with lead contents up to 3.5%. The lead brasses are used for architectural hardware, general purpose screw machine parts, screws, valves, fittings, bearings and specialty fasteners. The wrought lead brasses are designated by UNS C31200 through C38500.

 
Copper Alloys Cu Sn Pb Zn Fe Ni P Al Mn Si Sb S Bi
C31200 87.5-90.5 - 0.7-1.2 Rem. 0.1 0.25 - - - - - - -
C31400 87.5-90.5 - 1.3-2.5 Rem. 0.1 0.7 - - - - - - -
C31600 87.5-90.5 - 1.3-2.5 Rem. 0.1 0.7-1.2 0.04-0.1 - - - - - -
C32000 83.5-86.5 - 1.5-2.2 Rem. 0.1 0.25 - - - - - - -
C33000 65-68 - 0.25-0.7 Rem. 0.07 - - - - - - - -
C33200 65-68 - 1.5-2.5 Rem. 0.07 - - - - - - - -
C33500 62-65 - 0.25-0.7 Rem. 0.15 - - - - - - - -
C34000 62-65 - 0.8-1.5 Rem. 0.15 - - - - - - - -
C34200 62-65 - 1.5-2.5 Rem. 0.15 - - - - - - - -
C34500 62-65 - 1.5-2.5 Rem. 0.15 - - - - - - - -
C35000 60-63 - 0.8-2 Rem. 0.15 - - - - - - - -
C35300 60-63 - 1.5-2.5 Rem. 0.15 - - - - - - - -
C35330 59-64 - 1.5-3.5 Rem. - - - - - - - - -
C35600 60-63 - 2-3 Rem. 0.15 - - - - - - - -
C36000 60-63 - 2.5-3.7 Rem. 0.35 - - - - - - - -
C36500 58-61 0.25 0.25-0.7 Rem. 0.15 - - - - - - - -
C37000 59-62 - 0.8-1.5 Rem. 0.15 - - - - - - - -
C37100 58-62 - 0.6-1.2 Rem. 0.15 - - - - - - - -
C37700 58-61 - 1.5-2.5 Rem. 0.3 - - - - - - - -
C37710 56.5-60 - 1-3 Rem. 0.3 - - - - - - - -
C38000 55-60 0.3 1.5-2.5 Rem. 0.35 - - 0.5 - - - - -
C38500 55-59 - 2.5-3.5 Rem. 0.35 - - - - - - - -
 
 
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