C87850 Description
Copper silicon UNS C87850 has a copper content of not less than 74%.
Tabulated below are the mechanical properties of UNS C87850 permanent mold cast alloy as a function of heat treatment.
| Temper | Elong. | Rockwell | |||
|---|---|---|---|---|---|
| B | C | F | 30T | ||
| M05 | 21% | 74 | – | – | – |
| 16% | 70 | – | – | – | |
- C87850 Product description: Silicon brass
- Solids: Consult mill for sizes
- Tubes: Consult mill for sizes*
- Rectangles: Consult mill for sizes
- Standard lengths: 144″
- Shape/Form: Semi-finished, mill stock or near net shapes, anode, bar stock, billet/bloom, squares, hex, plate, profile or structural shape, flats/rectangular bar
- Compliance: C87850 is compliant with key legislation including (1) Federal Safe Drinking Water Act – SDWA, (2) S. 3874 Federal Reduction of Lead in Drinking Water Act, (3) California AB1953, and (4) Vermont Act 193
*Consult mill for wall thickness
Typical uses
Industrial: valve bodies for water
Marine: marine products
Plumbing: faucets, plumbing fittings, water meter cases
Similar or equivalent specification
| CDA | ASTM | SAE | AMS | Federal | Military | Other |
|---|---|---|---|---|---|---|
| C87850 | B505 B505M |
Chemical composition
| Cu% | Pb% | Sn% | Zn% | Fe% | P% | Ni%1 | Mn% | Sb% | Si% | ||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 75.00- 78.00 | 0.02*- 0.09 | 0.30 | Rem. | 0.10 | 0.05- 0.20 | 0.20 | 0.10 | 0.10 | 2.70- 3.40 | ||
| Chemical composition according to ASTM B505/B505M-23*Pb content is greater than 0.02%. 1Ni value includes Co.Note: Cu + sum of named elements, 99.5% min. Single values represent maximums. | |||||||||||
Machinability
| Copper alloy UNS No. | Machinability rating | Density (lb/in3 at 68 ˚F) |
|---|---|---|
| C87850 | 70 | 0.3 |
Mechanical properties
| Tensile strength, min | Yield strength (at 0.5% extension under load,, min) | Elongation, in 2 in. or 50 mm min | Brinell hardness (500 kg load) | Remarks | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| ksi | MPa | ksi | MPa | % | minimum BHN | ||||||
| 65 | 448 | 25 | 172 | 8 | 103 | ||||||
| Mechanical properties according to ASTM B505/B505M-23 | |||||||||||
Physical properties
| US Customary | Metric | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Melting point – liquidus | 1616 °F | 880 °C | |||||||||
| Melting point – solidus | 1571 °F | 855 °C | |||||||||
| Density | 0.3 lb/in3 at 68 °F | 8.3 gm/cm3 at 20 °C | |||||||||
| Electrical conductivity | 8% IACS at 68 °F | 0.046 MegaSiemens/cm at 20 °C | |||||||||
| Thermal conductivity | 21.8 Btu/sq ft/ft hr/°F at 68 °F | 37.8 W/m at 20 °C | |||||||||
| Coefficient of thermal expansion 68-212 | 10.3 · 10-6 per °F (68-212 °F) | 17.8 · 10-6 per °C (20-100 °C) | |||||||||
| Coefficient of thermal expansion 68-392 | 10.3 · 10-6 per °F (68-392 °F) | 17.8 · 10-6 per °C (20-200 °C) | |||||||||
| Coefficient of thermal expansion 68-572 | 10.4 · 10-6 per °F (68-572 °F) | 18 · 10-6 per °C (20-300 °C) | |||||||||
| Specific heat capacity | 0.09 Btu/lb/°F at 68 °F | 377.1 J/kg at 20 °C | |||||||||
| Modulus of elasticity in tension | 15200 ksi | 104801 MPa | |||||||||
| Physical properties provided by CDA | |||||||||||
Fabrication properties
| Technique | Suitability | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Soldering | Excellent | ||||||||||
| Brazing | Excellent | ||||||||||
| Oxyacetylene welding | Good | ||||||||||
| Spot weld | Good | ||||||||||
| Seam weld | Good | ||||||||||
| Butt weld | Good | ||||||||||
| Capacity for being cold worked | Poor | ||||||||||
| Capacity for being hot formed | Excellent | ||||||||||
| Machinability rating | 70 | ||||||||||
| Fabrication properties provided by CDA | |||||||||||
Thermal properties
| Thermal properties provided by CDATemperature is measured in fahrenheit. **For stress relief, Solution treatment and annealing – time is measured in hours/inch of thickness. For precipitation heat treatment – time is measured in hours. |
