Cast C90700
Tin bronze alloys, such as C90700, are typically found in gear, high-strength bushing and bearing applications where low speeds and heavy loads are present. Other high-strength applications for these alloys include pump impellers, piston rings, steam fittings and valve bodies. C908 tin bronze castings are utilized in movable bridge components, turntables for bridges and other structures for fixed and expansion bearings with slow or intermittent movement with heavy loads.
Information
Product description: 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
Industrial: bearings, bearings for heavy loads and relatively low speeds, gear boxes, gears, restaurant equipment, speed reducers, valve bodies, worm gears, worm wheels
Similar or equivalent specification
| CDA | ASTM | SAE | AMS | Federal | Military | Other |
|---|---|---|---|---|---|---|
| C90700 | B505 B505M | 65 J461 J462 | 4845 | Tin bronze, 65 |
Chemical composition
| Cu%1 | Pb% | Sn% | Zn% | Fe% | P% | Ni%1,2 | Al% | S% | Sb% | Si% |
|---|---|---|---|---|---|---|---|---|---|---|
| 88.00-89.00 | 0.50 | 10.00-12.00 | 0.50 | 0.15 | 1.50 | 0.50 | 0.005 | 0.05 | 0.20 | 0.005 |
Chemical composition according to ASTM B505/B505M-23
¹In determining Cu min., Cu may be calculated as Cu + Ni. ²Ni value includes Co.
Note: Cu + sum of named elements, 99.4% min. Single values represent maximums.
Machinability
| Copper alloy UNS no. | Machinability rating | Density (lb / in³ at 68°F) |
|---|---|---|
| C90700 | 20 | 0.317 |
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 | |
| 40 | 276 | 25 | 172 | 10 | 102 | |
Physical properties
| US Customary | Metric | |
|---|---|---|
| Melting point - liquidus | 1830 °F | 999 °C |
| Melting point - solidus | 1528 °F | 831 °C |
| Density | 0.317 lb/in³ at 68 °F | 8.77 gm/cm³ at 20 °C |
| Specific gravity | 8.77 | 8.77 |
| Electrical conductivity | 10% IACS at 68 °F | 0.056 MegaSiemens/cm at 20 °C |
| Thermal conductivity | 40.8 Btu/sq ft/ft hr/°F at 68 °F | 70.6 W/m at 20 °C |
| Coefficient of thermal expansion 68-572 | 10.2 · 10-6 per °F (68-212 °F) | 18.4 · 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 | 15000 ksi | 103400 MPa |
| 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.