C28500 is a lead free material which is however quite suitable for machining due to its structural constitution. C28500 can be therefore used as a cost-effective replacement for conventional lead-containing machining brass provided that it must not meet high requirements as regards mechanical properties and corrosion resistance.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
| Cu | 57.00 | 59.00 |
| Pb | – | 0.25 |
| Fe | – | 0.35 |
| Total Others | – | 0.90 |
| 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 | 69 | 43 | 8 | – | – |
| 0.500 | 1.000 | 65 | 36 | 12 | – | – |
| 1.000 | 2.953 | 59 | 26 | 16 | – | – |
| Hexagon (A/F) | 0.118 | 0.500 | 69 | 43 | 8 | – | – |
| 0.500 | 1.000 | 65 | 36 | 12 | – | – |
| 1.000 | 2.756 | 59 | 26 | 16 | – | – |
| Square (A/F) | 0.118 | 0.500 | 69 | 43 | 8 | – | – |
| 0.500 | 1.000 | 65 | 36 | 12 | – | – |
| 1.000 | 2.362 | 59 | 26 | 16 | – | – |
| Rectangle (Thickness) | 0.118 | 0.500 | 69 | 43 | 8 | – | – |
| 0.500 | 1.000 | 65 | 36 | 12 | – | – |
| 1.000 | 1.969 | 59 | 26 | 16 | – | – |
| Range (mm) | From | To | UTS Min (MPa) | PS Min (MPa) | Elongation Min (%) | Hardness Min | Hardness Max |
| Round (Dia) | 1.5 | 12 | 480 | 300 | 8 | – | – |
| 12 | 25 | 450 | 250 | 12 | – | – |
| 25 | 75 | 410 | 180 | 18 | – | – |
| Hex (A/F) | 3 | 12 | 480 | 300 | 18 | – | – |
| 12 | 25 | 450 | 250 | 12 | – | – |
| 25 | 70 | 410 | 180 | 18 | – | – |
| Square (A/F) | 3 | 12 | 480 | 300 | 8 | – | – |
| 12 | 25 | 450 | 250 | 12 | – | – |
| 25 | 50 | 410 | 180 | 18 | – | – |
| Rectangle (Thickness) | 3 | 12 | 480 | 300 | 8 | – | – |
| 12 | 25 | 450 | 250 | 12 | – | – |
| 25 | 50 | 410 | 180 | 18 | – | – |
| PHYSICAL PROPERTIES |
| Melting Point – Liquidus°F | 1650 |
| Melting Point – Solidus°F | 1630 |
| Densitylb/cu in. at 68°F | 0.303 |
| Specific Gravity | 8.39 |
| Electrical Conductivity% IACS at 68°F | 29 |
| Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F | 58 |
| Coefficient of Thermal Expansion 68-21210⁻⁶ per °F (68 – 212°F) | 11 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 121 |
| Specific Heat CapacityBtu/ lb /°F at 68°F | 0.09 |
| Modulus of Elasticity in Tensionksi | 12300 |
| 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 | Fair |
| Capacity for Being Hot Formed | Excellent |
| Forgeability Rating | 100 |
| Machinability Rating | 60 |
