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ass is the name used for a wide range of copper-zinc alloys. These alloys vary by the amount of zinc as well as the inclusion of other alloying elements such as lead, aluminum, and iron. Brass is thermally and electrically conductive thanks to its copper content. It also has good wear resistance. The inclusion of lead improves machinability, making brass the most machinable of all the copper alloys. Choose Brass CNC machining in the FlagShip Instant Quoting Engine℠ Brass is a versatile copper alloy that retains some of the benefits of copper but also improves on some of its attributes. Brass is a mechanically stronger and lower-friction metal, and offers better corrosion and wear resistance than basic copper. These properties make CNC machining brass ideal for mechanical applications that also require corrosion resistance such as those encountered in the marine industry.
CNC MetalsCopper C260 is a zinc-alloyed formulation with approximately 30% zinc with less than 1% lead and iron. This grade is sometimes referred to as cartridge brass thanks to its history of use in ammunition cartridges. Other common applications include rivets, hinges, and radiator cores.
Cartridge Brass Properties
| Tensile Strength, Yield (MPa) | Fatigue Strength (MPa) | Elongation at Break (%) | Hardness (Brinell) | Density (g/cm^3) |
|---|---|---|---|---|
| 95 | 91 | 66 | 55 | 8.55 |
Copper C360, also referred to as free-cutting brass, is highly machinable due to the relatively high amount of lead in the alloy. Typical applications include gears, screw machine parts, and valve components.
Free-Cutting Brass Properties
| Tensile Strength, Yield (MPa) | Fatigue Strength (MPa) | Elongation at Break (%) | Hardness (Brinell) | Density (g/cm^3) |
|---|---|---|---|---|
| 124 to 310 | 136 | 55 | 63 to 132 | 8.50 |
Like stainless steel or copper, brass is often left uncoated due to its inherent conductivity, corrosion resistance, and low friction coefficient. However, clear coating is considered if the application is cosmetic and the part is exposed to the elements. Listed below are some useful surface finishes for CNC machined brass.
Hand polishing, buffing, or honing: Brass is often used for ornamental applications. This is in part because different brass alloys naturally show up in different colors. Polishing brass can produce a very smooth and shiny surface, making it ideal for aesthetic components.
As Machined: Brass readily accepts machining, so its freshly machined surfaces often come out with attractive finishes even without any extra attention. As such, it’s often viable to just leave the part as machined. The surface finish is further improved with additional finishing passes.
