C38500
C38500, categorized as Free cutting brass, represents a notably enhanced iteration of 60/40 brass, distinguished by its exceptional free cutting characteristics. It finds application in the large-scale manufacturing of brass components demanding peak efficiency and extended tool longevity, particularly in scenarios where no additional cold forming is needed post-machining.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
| Cu | 56.00 | 59.00 |
| Pb | 2.00 | 3.50 |
| Total Others | – | 0.75 |
| Zn | Remainder | |
MECHANICAL PROPERTIES ACCORDING TO ASTM B455 (AS PER TEMPER HO2)
| Range | From | To | UTS Min (Kg/mm²) | PS Min | Elongation Min (%) | Hardness Min | Hardness Max | |
| Round (Dia) | 1.5 | 75 | 39 | – | 12 | – | – | |
| Hex (A/F) | 3 | 70 | 39 | – | 12 | – | – | |
| Square (A/F) | 3 | 60 | 39 | – | 12 | – | – | |
| Rectangle (Thickness) | 3 | 50 | 39 | – | 12 | – | – | |
| PHYSICAL PROPERTIES | |
| Melting Point – Liquidus°F | 1630 |
| Melting Point – Solidus°F | 1610 |
| Densitylb/cu in. at 68°F | 0.306 |
| Specific Gravity | 8.47 |
| Electrical Conductivity% IACS at 68°F | 28 |
| Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F | 71 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 11.6 |
| Specific Heat CapacityBtu/ lb /°F at 68°F | 0.09 |
| Modulus of Elasticity in Tensionksi | 14000 |
| Modulus of Rigidityksi | 5300 |
| FABRICATION PROPERTIES | |
| Technique | Suitability |
| Soldering | Excellent |
| Brazing | Good |
| Oxyacetylene Welding | Not Recommended |
| Gas Shielded Arc Welding | Not Recommended |
| Coated Metal Arc Welding | Not Recommended |
| Spot Weld | Not Recommended |
| Seam Weld | Not Recommended |
| Butt Weld | Fair |
| Capacity for Being Cold Worked | Poor |
| Capacity for Being Hot Formed | Excellent |
| Machinability Rating | 90 |
