| Alloy Name | |
|---|---|
| BS CZ107 | CuZn33 |
| ASTM | C26800 |
| JIS | C2680 |
| This alloy is as per the RoHS specification. | |
CuZn33 is the major brass alloy for the cold forming process. Even though brasses with lower Zinc content have better cold forming properties, CuZn33 is the most used alloy. Reasons for this are on the one hand economical due to lower price of Zinc compared to Copper, on the other hand the forming properties of this alloy meet the demand of many applications.
| Chemical Composition | Weight percentage |
|---|---|
| Cu | 64.00 - 67.00% |
| Pb | 0.10% Max |
| Fe | 0.10% Max |
| Zn | Remaining |
| Other Impurities | 0.40% |
| Main Applications |
|---|
| Electrical: Socket Shells, Flashlight Shells, Lamp Fixture, Reflectors, Screw Shells. |
| Fasteners: Pins, Rivets, Grommets, Eyelets, Screws. |
| Industrial: Springs, Chain, Bead Chain. |
| Automotive: Radiator Cores, Tanks. |
| Physical Properties Typical values in annealed temper at 20 °C | ||
|---|---|---|
| Density | 8.33 | g/cm3 |
| Thermal expansion coefficient -191 .. 16 | 17.0 | 10-6/K |
| Specific heat capacity - 0 .. 300°C | 20.2 | 10-6/K |
| Thermal conductivity | 0.377 | J/(g•K) |
| Electrical conductivity (1 MS/m = 1 m/(O mm²)) | 121 | W/(m•K) |
| Electrical conductivity (IACS) | 14 | MS/m % |
| Thermal coefficient of electrical resistance (0 .. 200 °C) | 1.7 | 10-3/K |
| Modulus of elasticity (1 GPa = 1 kN/mm²) cold formed | 99....115 | GPa |
| Temper | Tensile Strength Rm MPa(N/mm2) | Yield Strength Rp0.2 MPa(N/mm2) | Elongation A50mm % | Hardness HV |
|---|---|---|---|---|
| O (Soft) | 280 Min | 180 | 45 Min | 80 Max |
| HB (Half Hard) | 340 Min | 180 | 35 Min | 75 Min |
| HD (Hard) | 385 Min | 300 | 20 Min | 110 Min |
| HE (Extra Hard) | 460 Min | 350 | 5 Min | 135 Min |
| HE (Extra Hard) | 525 Min | 450 | 165 Min |