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C37700
C37700
UNS C37700 (standardized under ASTM B124 / ASTM B124M for forging rod, bar, and shapes, and ASTM B283 / ASTM B283M for die forgings) is the global benchmark alloy for hot forging and closed-die hot stamping. Metallurgically formulated as a duplex (α + β) leaded brass with 58.0% to 61.0% Copper, 1.5% to 2.5% Lead (Pb), and a zinc balance, C37700 is engineered specifically to yield optimal plastic flow in heated forging dies while maintaining free-cutting performance during post-forge secondary CNC machining.
Chemical Composition
Elements | Min (%) | Max (%) |
Cu | 58.00 | 61.00 |
Pb | 1.50 | 2.50 |
Fe | – | 0.30 |
Total Others | – | 0.50 |
Zn | Remainder | |
Mechanical Properties According To ASTM B124 |
|
| Melting Point – Liquidus°F | 1640 |
| Melting Point – Solidus°F | 1620 |
| Density lb/cu in. at 68°F | 0.305 |
| Specific Gravity | 8.44 |
| 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) | 11.5 |
| 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 | Poor |
| Capacity for Being Hot Formed | Excellent |
| Forgeability Rating | 100 |
| Machinability Rating | 80 |
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