C712R
CW712R, recognized as naval brass, holds significant relevance in applications involving machine hardware, screw machine products, and valve stems. Notably, CW712R naval brass stands out as an excellent choice for hot forging, pressing, and machining operations. Boasting elevated ductility, this naval brass variant also excels in terms of electrical and thermal conductivity. Additionally, CW712R naval brass showcases commendable resistance to creep and remarkable impact strength.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
| Cu | 61.00 | 63.00 |
| Pb | 0.20 | 0.60 |
| Sn | 1.00 | 1.50 |
| Fe | 0.00 | 0.10 |
| Ni | 0.00 | 0.20 |
| Total Others | – | 0.20 |
| Zn | Remainder | |
MECHANICAL PROPERTIES ACCORDING TO EN12165 (AS PER TEMPER H080)
| Range (mm) | From | To | UTS Min | PS Min | Elongation Min | Hardness Min (HRB) | Hardness Max (HRB) |
| Round (Dia) | 8 | 75 | – | – | – | 80 | 140 |
| Hex (A/F) | 8 | 65 | – | – | – | 80 | 140 |
| Square (A/F) | 8 | 60 | – | – | – | 80 | 140 |
| PHYSICAL PROPERTIES | |
| Melting Point – Liquidus°F | 1650 |
| Melting Point – Solidus°F | 1630 |
| Density lb/cu in. at 68°F | 0.305 |
| Specific Gravity | 8.44 |
| Electrical Conductivity % IACS at 68°F | 26 |
| Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F | 67 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 11.8 |
| 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 | Good |
| Forgeability Rating | 90 |
| Machinability Rating | 50 |
