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CW712R
CW712R
CW712R (metallurgical designation CuZn36Sn1Pb) is a duplex (α + β) Naval Brass governed by European standards EN 12164 (rods for free machining), EN 12165 (forging stock), and EN 12167 (profiles and rectangular bars). Recognized as the modern Euronorm equivalent to traditional BS 2874 CZ112 and closely aligned with ASTM B21 UNS C46200 / C46400, it is engineered for marine and high-humidity environments where seawater corrosion resistance, mechanical strength, and hot workability are paramount.
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 EN 12165 (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 |
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