C27400
UNS C27400, commonly referred to as yellow brass, consists of a copper content of at least 62%. CuZn37 serves as the primary brass alloy for cold forming processes. Although brasses with lower zinc content exhibit improved cold forming properties, CuZn37 remains the preferred alloy for several compelling reasons. Firstly, its use is economically advantageous, as zinc is more cost-effective than copper. Secondly, the forming characteristics of this alloy align with the requirements of numerous applications, making it a practical and widely adopted choice.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
| Cu | 61.00 | 64.00 |
| Pb | – | 0.10 |
| Fe | – | 0.05 |
| Total Others | – | 0.30 |
| Zn | Remainder | |
MECHANICAL PROPERTIES ACCORDING TO ASTM B927 (AS PER TEMPER HO2)
| Range (Inch) | From | To | UTS Min (Ksi) | PS Min (Ksi) | Elongation Min (%) | Hardness Min | Hardness Max |
| Round (Dia) | 0.059 | 0.500 | 53 | 33 | 10 | – | – |
| 0.500 | 1.000 | 48 | 30 | 13 | – | – | |
| 1.000 | 2.953 | 43 | 28 | 15 | – | – | |
| Hexagon (A/F) | 0.118 | 0.500 | 53 | 33 | 10 | – | – |
| 0.500 | 1.000 | 48 | 30 | 13 | – | – | |
| 1.000 | 2.756 | 43 | 28 | 15 | – | – | |
| Square (A/F) | 0.118 | 0.500 | 53 | 33 | 10 | – | – |
| 0.500 | 1.000 | 48 | 30 | 13 | – | – | |
| 1.000 | 2.362 | 43 | 28 | 15 | – | – | |
| Rectangle (Thickness) | 0.118 | 0.500 | 53 | 33 | 10 | – | – |
| 0.500 | 1.000 | 48 | 30 | 13 | – | – | |
| 1.000 | 1.969 | 43 | 28 | 15 | – | – |
| Range (mm) | From | To | UTS Min (MPa) | PS Min (MPa) | Elongation Min (%) | Hardness Min | Hardness Max |
| Round (Dia) | 1.5 | 12 | 365 | 230 | 10 | – | – |
| 12 | 25 | 330 | 205 | 13 | – | – | |
| 25 | 75 | 295 | 195 | 15 | – | – | |
| Hex (A/F) | 3 | 12 | 365 | 230 | 10 | – | – |
| 12 | 25 | 330 | 205 | 13 | – | – | |
| 25 | 70 | 295 | 195 | 15 | – | – | |
| Square (A/F) | 3 | 12 | 345 | 170 | 10 | – | – |
| 12 | 25 | 310 | 115 | 20 | – | – | |
| 25 | 50 | 275 | 105 | 20 | – | – | |
| Rectangle (Thickness) | 3 | 12 | 345 | 170 | 10 | – | – |
| 12 | 25 | 310 | 115 | 20 | – | – | |
| 25 | 50 | 275 | 105 | 20 | – | – |
| PHYSICAL PROPERTIES | |
| Melting Point – Liquidus°F | 1680 |
| Density lb/cu in. at 68°F | 0.31 |
| Specific Gravity | 8.44 |
| Electrical Conductivity % IACS at 68°F | 27 |
| 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 | |
| Technique | Suitability |
| Soldering | Excellent |
| Brazing | Excellent |
| Oxyacetylene Welding | Good |
| Gas Shielded Arc Welding | Fair |
| Coated Metal Arc Welding | Not Recommended |
| Spot Weld | Good |
| Seam Weld | Not Recommended |
| Butt Weld | Good |
| Capacity for Being Cold Worked | Excellent |
| Capacity for Being Hot Formed | Fair |
| Machinability Rating | 35 |
