C67420
C67420 is a distinct brass alloy known for its exceptional wear resistance, primarily attributed to the presence of embedded silicides within its structure. This alloy finds valuable application in the manufacturing of slide bearings and valve guides, as well as serving as a material of choice for construction components in the field of mechanical engineering. Furthermore, C67420 is particularly well-suited for use in hot stamped parts where elevated mechanical strength and enhanced wear resistance are essential attributes.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
| Cu | 57.00 | 58.50 |
| Pb | 0.25 | 0.80 |
| Sn | – | 0.35 |
| Al | 1.00 | 2.00 |
| Fe | 0.15 | 0.55 |
| Mn | 1.50 | 2.50 |
| Ni | – | 0.25 |
| Si | 0.25 | 0.70 |
| Total Others | – | 0.50 |
| Zn | Remainder | |
MECHANICAL PROPERTIES ACCORDING TO UNS C67420 (AS PER TEMPER HO2)
| Range (Inch) | From | To | UTS Min (ksi) | PS Min (ksi) | Elongation Min (%) | Hardness Min (HRB) | Hardness Max |
| Round (Dia) | 0.059 | 2.953 | 87 | 46 | 15 | 85 | – |
| Hex (A/F) | 0.118 | 2.756 | 87 | 46 | 15 | 85 | – |
| Square (A/F) | 0.118 | 2.362 | 87 | 46 | 15 | 85 | – |
| Rectangle (Thickness) | 0.118 | 1.968 | 87 | 46 | 15 | 85 | – |
| Range (mm) | From | To | UTS Min (MPa) | PS Min (MPa) | Elongation Min (%) | Hardness Min (HRB) | Hardness Max | |
| Round (Dia) | 1.5 | 75 | 600 | 317 | 15 | 85 | – | |
| Hex (A/F) | 3 | 70 | 600 | 317 | 15 | 85 | – | |
| Square (A/F) | 3 | 60 | 60 | 600 | 317 | 15 | 85 | |
| Rectangle (Thickness) | 3 | 50 | 600 | 317 | 15 | 85 | – |
| PHYSICAL PROPERTIES | |
| Melting Point – Liquidus°F | 1650 |
| Melting Point – Solidus°F | 1590 |
| Density lb/cu in. at 68°F | 0.299 |
| Specific Gravity | 8.27 |
| Electrical Conductivity % IACS at 68°F | 18 |
| Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F | 51 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 11 |
| Specific Heat Capacity Btu/ lb /°F at 68°F | 0.09 |
| Modulus of Elasticity in Tension ksi | 14000 |
| Modulus of Rigidity ksi | 5250 |
| Fabrication Properties | |
| Technique | Suitability |
| Soldering | Fair |
| Brazing | Good |
| Oxyacetylene Welding | Not Recommended |
| Gas Shielded Arc Welding | Fair |
| Coated Metal Arc Welding | Not Recommended |
| Spot Weld | Good |
| Seam Weld | Good |
| Butt Weld | Good |
| Capacity for Being Cold Worked | Poor |
| Capacity for Being Hot Formed | Excellent |
| Forgeability Rating | 100 |
| Machinability Rating | 50 |
