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C37000
C37000
UNS C37000 (standardized under ASTM B124 / ASTM B283 for forgings, ASTM B135 for seamless tube, and ASTM B981 for low-leaded rod and shapes) is an engineered (α + β) duplex brass known historically as Free-Cutting Muntz Metal or Leaded 60/40 Brass. Formulated with 59.0% to 62.0% Copper, a moderate 0.8% to 1.5% Lead (Pb) addition, and a zinc balance, C37000 bridges the gap between high-speed free-cutting brass (C36000) and hot-forging brass (C37700). By keeping lead lower than traditional screw-machine alloys while maintaining a balanced duplex matrix, C37000 delivers a 70% machinability rating alongside reliable hot workability and moderate cold-forming ductility.
Chemical Composition
Elements | Min (%) | Max (%) |
Cu | 59.00 | 62.00 |
Pb | 0.8 | 1.50 |
Fe | – | 0.15 |
Total Others | – | 0.40 |
Zn | Remainder | |
Physical Properties |
|
| Melting Point – Liquidus°F | 1650 |
| Melting Point – Solidus°F | 1630 |
| Density lb/cu in. at 68°F | 0.304 |
| Specific Gravity | 8.41 |
| Electrical Conductivity % IACS at 68°F | 27 |
| Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F | 69 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 11.6 |
| Specific Heat Capacity Btu/ lb /°F at 68°F | 0.09 |
| Modulus of Elasticity in Tension ksi | 15000 |
| Modulus of Rigidity ksi | 5600 |
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 | Fair |
| Capacity for Being Hot Formed | Excellent |
| Machinability Rating | 70 |
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