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C3604
C3604
JIS C3604 (governed by Japanese Industrial Standard JIS H 3250) is the East Asian benchmark free-cutting brass alloy, widely utilized across global electronics, automotive, and precision turned hardware manufacturing. Formulated with a controlled copper content of 57.0% to 61.0% and 1.8% to 3.7% lead, it is engineered specifically for high-speed automatic lathe cutting, Swiss-type CNC machining, drilling, and fine threading.
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 (mm) |
From |
To |
UTS Min (kg/mm²) |
UTS Max (kg/mm²) |
PS Min (kg/mm²) |
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 |
| Density lb/cu in at 68°F | 0.306 |
| Specific Gravity | 8.47 |
| Electrical Conductivity %IACS at 68°F | 28 |
| Thermal Conductivity BTU/ sq ft/ ft hr/ °F at 68°F | 71 |
| Coefficient of Thermal Expansion 68-572 10⁻⁶ per °F (68 – 572°F) | 11.6 |
| Specific Heat BTU/ lb /°F at 68°F | 0.09 |
| Modulus of Elasticity in Tension ksi | 14000 |
| Modulus of Rigidity ksi | 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 Welding | Not Recommended |
| Seam Welding | Not Recommended |
| Butt Welding | Fair |
| Capacity for Being Cold Worked | Poor |
| - | Excellent |
| Machinability Rating | 90 |
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