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C3603
C3603
JIS C3603 (standardized under Japanese Industrial Standard JIS H 3250) is a high-leaded, free-machining brass alloy specifically developed for high-volume automated manufacturing, Swiss-type CNC turning, and precision screw machining. Formulated with 57.0% to 61.0% copper and a generous lead addition of 1.8% to 3.0%, it is positioned directly between C3602 (medium-lead) and C3604 (maximum-lead). This alloy provides rapid chip disposal, extended cutting-tool life, and tight dimensional stability, while retaining sufficient tensile strength and surface density for precision components.
Chemical Composition
Elements | Min (%) | Max (%) |
Cu | 57.00 | 61.00 |
Pb | 1.80 | 3.70 |
Fe | – | 0.35 |
Sn+Fe | – | 0.60 |
Zn | Remainder | |
Mechanical Properties According To H3250 JIS C3603 (As Per Temper BD)
Range |
From |
To |
UTS Min (Kg/mm²) |
PS Min |
Elongation Min (%) |
Hardness Min |
Hardness Max |
|
| Round (Dia) | 1.5 |
75 |
315 |
– |
20 |
– |
– |
|
| Hex (A/F) | 3 |
70 |
315 |
– |
20 |
– |
– |
|
| Square (A/F) | 3 |
60 |
315 |
– |
20 |
– |
– |
|
| Rectangle (Thickness) | 3 |
50 |
315 |
– |
20 |
– |
– |
|
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 |
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