C27200
UNS C27200, often referred to as yellow brass, contains a minimum of 62% copper. CuZn37 is the primary brass alloy used for cold forming processes. While brasses with lower zinc content may offer superior cold forming properties, CuZn37 remains the most widely used alloy for several reasons. Firstly, it is economically advantageous because zinc is less expensive than copper. Secondly, this alloy’s forming properties align with the requirements of many applications, making it a practical choice.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
| Cu | 62.00 | 65.00 |
| Pb | – | 0.07 |
| Fe | – | 0.07 |
| Total Others | – | 0.30 |
| Zn | Remainder | |
MECHANICAL PROPERTIES ACCORDING TO ASTM B36 (AS PER TEMPER HO2)
| Range (Inch) | From | To | UTS Min (ksi) | UTS Max (ksi) | PS Min (ksi) | Elongation Min (%) | Hardness Min (HRB) | Hardness Max (HRB) |
| Round (Dia) | 0.059 | 2.953 | 56 | 66 | – | – | 60 | 76 |
| Hex (A/F) | 0.118 | 2.756 | 56 | 66 | – | – | 60 | 76 |
| Square (A/F) | 0.118 | 2.362 | 56 | 66 | – | – | 60 | 76 |
| Range (mm) | From | To | UTS Min (MPa) | UTS Max (MPa) | PS Min (MPa) | Elongation Min (%) | Hardness Min (HRB) | Hardness Max (HRB) |
| Round (Dia) | 1.5 | 75 | 385 | 455 | – | – | 60 | 76 |
| Hex (A/F) | 3 | 70 | 385 | 455 | – | – | 60 | 76 |
| Square (A/F) | 3 | 60 | 385 | 455 | – | – | 60 | 76 |
| PHYSICAL PROPERTIES | |
| Melting Point – Liquidus°F | 1680 |
| Density lb/cu in. at 68°F | 0.305 |
| Specific Gravity | 8.44 |
| Electrical Conductivity % IACS at 68°F | 27.6 |
| Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F | 67 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 11.4 |
| Specific Heat Capacity Btu/ lb /°F at 68°F | 0.09 |
| Modulus of Elasticity in Tension ksi | 15000 |
| Modulus of Rigidity ksi | 5600 |
| FABRICATION PROPERTIES | |
| No fabrication properties for this alloy. |
