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C3604
C3604, classified as Free cutting brass, stands as a notably refined version of 60/40 brass, showcasing exceptional free cutting characteristics. Its utilization lies in the high-volume production of brass components necessitating optimal output and extended tool longevity. This is particularly relevant in situations where no subsequent cold forming is needed after the machining process.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
| Cu | 57.00 | 61.00 |
| Pb | 1.80 | 3.70 |
| Fe | – | 0.50 |
| Sn + Fe | – | 1.20 |
| Zn | Remainder | |
MECHANICAL PROPERTIES ACCORDING TO H3250 JIS C3604 (AS PER TEMPER BD)
| Range | From | To | UTS Min (Kg/mm²) | PS Min | Elongation Min (%) | Hardness Min | Hardness Max | |
| Round (Dia) | 1.5 | 75 | 335 | – | – | 80 | – | |
| Hex (A/F) | 3 | 70 | 335 | – | – | 80 | – | |
| Square (A/F) | 3 | 60 | 335 | – | – | 80 | – | |
| Rectangle (Thickness) | 3 | 50 | 335 | – | – | 80 | – | |
| 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 |
