Cast C93700
The lead content in these alloys is between 7 percent and 30 percent. High-leaded tin bronzes are free cutting and retain favorable thermal conductivity and good lubricity due to the lead content. The high-leaded tin bronzes are ideal for bearing applications where there could be a loss of the lubrication boundary. These alloys perform excellent in unforgiving environments where foreign matter may be present, such as dirt and other foreign materials. The high-leaded alloys are able to envelope foreign matter due to their malleable nature and, in doing so, protect the wear surface of a mating part such as a shaft.
Information
Product description: High-Leaded Tin bronze
Solids: 1/2" to 10" O.D.
Tubes: 1” to 16” O.D.
Rectangles: Up to 20”
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
Typical uses
BUILDERS HARDWARE: brackets
Fasteners: nuts, washers for engines
Industrial: applications requiring acid resistance to sulphite fluids, bearing plates, bearings, bushings, bushings for high speed and heavy pressure, corrosion-resistant castings, crank shafts, high speed/heavy load bearings, impellers, machine parts, parts for steel mill maintenance, pressure-tight castings, pumps, slide guides for steel mills
MARINE: large bearings for ships
Similar or equivalent specification
| CDA | ASTM | SAE | AMS | Federal | Military | Other |
|---|---|---|---|---|---|---|
| C93700 | B505 B505M | 65 J461 J462 | QQ-C-390, E10 | MIL-B-11553, Comp 23 | Bearing Bronze; 80-10-10 Bronze |
Chemical composition
| Cu% | Pb% | Sn% | Zn% | Fe%1 | P% | Ni%2 | Al% | S% | Sb% | Si% |
|---|---|---|---|---|---|---|---|---|---|---|
| 78.00-82.00 | 8.00-11.00 | 9.00-11.00 | 0.80 | 0.70 | 1.50 | 0.50 | 0.005 | 0.08 | 0.50 | 0.005 |
Chemical composition according to ASTM B505/B505M-18
¹Fe shall be 0.35% max., when used for steel-backed bearings. ²Ni value includes Co.
Note: Cu + sum of named elements, 99.0% min. Single values represent maximums.
Machinability
| Copper alloy UNS no. | Machinability rating | Density (lb / in³ at 68°F) |
|---|---|---|
| C93700 | 80 | 0.32 |
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 | % | typical BHN | |
| 35 | 241 | 20 | 138 | 6 | 60 | |
Physical properties
| US Customary | Metric | |
|---|---|---|
| Melting point - liquidus | 1705 °F | 929 °C |
| Melting point - solidus | 1403 °F | 762 °C |
| Density | 0.32 lb/in³ at 68 °F | 8.86 gm/cm³ at 20 °C |
| Specific gravity | 8.86 | 8.86 |
| Electrical conductivity | 10% IACS at 68 °F | 0.059 MegaSiemens/cm at 20 °C |
| Thermal conductivity | 27.1 Btu/sq ft/ft hr/°F at 68 °F | 46.9 W/m at 20 °C |
| Coefficient of thermal expansion 68-572 | 10.3 · 10-6 per °F (68-212 °F) | 17.8 · 10-6 per °C (20-100 °C) |
| Specific heat capacity | 0.09 Btu/lb/°F at 68 °F | 377.1 J/kg at 20 °C |
| Modulus of elastic in tension | 11000 ksi | 75800 MPa |
| Incipient Melting | 600°F | 316°C |
| Magnetic permeability | 1 | 1 |
Fabrication properties
| Technique | Suitability |
|---|---|
| Soldering | Excellent |
| Brazing* | Good |
| Oxyacetylene welding | Fair |
| Gas shielded arc welding | Fair |
| Coated metal arc welding | Fair |
| Machinability rating | 20 |
Fabrication properties provided by CDA
*Since brazing is performed withing the hot-short range, strain must be avoided during brazing and cooling.
Thermal properties
| Treatment | Value* | Time** |
|---|---|---|
| Stress relief | 500 | |
| Solution treatment | 0 |
Thermal properties provided by CDA
*Temperature 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.