Forging Cutting Brass

Free Cutting Brass is commonly known as leaded brass which contains 56% to 63% of Copper, 0.50% to 3.70% Lead and remaining of Zinc. It is strong but easy to form, stamp or draw which make it a common choice for a broad spectrum of applications. It has high machinability. Machinability is a catch-all term that describes such important features as the ease with which a metal can be turned, drilled or otherwise cut, the length of time cutting tools remain sharp and the quality of the metal's machined surfaces. No other metal or alloy - and certainly none in its strength class - can be machined faster, longer or more consistently than Free Cutting Brass. Tests have shown that Free Cutting Brass can be machined up to five times faster than steel under conditions under which both metals maintain the same cutting tool life.

Different Grades, Chemical Composition, Physical and Fabrication Properties of Free Cutting Brass

Product Forging Cutting Brass
SPECIFICATION IS-319 Type I CZ-121 Pb3 ASTM-B16 UNS-38500 IS-319 Type II CZ-124 ASTM-B16 UNS-36000 IS-319 Type III CZ-124 ASTM-B16 UNS-35300
Chemical Composition % % %
Copper 56.00 - 59.00 60.00 - 63.00 62.00 - 63.00
Lead 2.00 - 3.50 2.50 - 3.70 0.50 - 1.50
Tin - - -
Iron 0.50 Max. 0.35 Max. 0.20 Max.
Manganese - - -
Aluminium - - -
Zinc Balance Balance Balance
Impurities 0.70 Max. 0.50 Max. 0.50 Max.
Physical Properties  
Tensile (Kgs/mm2) 36 Min. 35 Min. 31 Min.
Elongation-5.65 √A 12% Min. 15% Min. 22% Min.
Izod (kgfm) - - -
Fabrication Properties  
Cold Working Poor Poor Fair
Hot Forming Fair Fair Excellent
Machinability 100% 90% 80%
Soldering Excellent Excellent Excellent
Brazing Good Good Excellent
Forging - - -
Welding - - -
Bending / Revetting - - -

Applications for Free Cutting Brass
Machined components, architectural products, hinges, locks, butts, screws, nuts and bolts.