C90700 Tin Bronze
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Introduction
Tin bronze sand casting alloy UNS C90700 is a cast alloy of copper-tin. Bronze is used in architecture for its colour and lustre.
The following datasheet provides chemical composition and properties of the UNS C90700 alloy.
Chemical Composition
The chemical composition of the UNS C90700 alloy is given in the following table.
| Element | Content (%) |
|---|---|
| Cu | 89 |
| Sn | 11 |
Physical Properties
The following table details the physical properties of the UNS C90700 alloy.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8.77 g/cm3 | 0.317 lb/in³ |
Mechanical Properties
The mechanical properties of the UNS C90700 alloy are shown in the following table.
| Properties | Metric | Imperial |
|---|---|---|
| Hardness, Brinell | 80 | 80 |
| Tensile strength | 305 MPa | 44200 psi |
| Yield strength | 150 MPa | 21800 psi |
| Elongation at break | 25.00% | 25.00% |
| Machinability | 20 | 20 |
| Fatigue strength | 170 MPa | 24700 psi |
| Elastic modulus | 117 GPa | 16969 ksi |
| Poisson's ratio | 0.34 | 0.34 |
Thermal properties
The following table discusses the thermal properties of the UNS C90700 alloy.
| Properties | Metric | Imperial |
|---|---|---|
| Thermal expansion co-efficient (@20-200°C/68-392°F) | 18.0 µm/m°C | 10.0 µin/in°F |
| Thermal conductivity(@20.0°C/68°F) | 71.0 W/mK | 493 BTUin/hr.ft².°F |
Other Designations
Equivalent designations to the UNS C90700 alloy include:
ASTM B30
ASTM B427
ASTM B505
QQ C390
SAE J461
SAE J462
Fabrication and Heat Treatment
Machinability
The UNS C90700 alloy has a machinability rating of 20.
Welding
The preferred welding techniques for the UNS C90700 alloy are soldering, brazing, carbon arc welding, oxyacetylene welding, gas shielded arc welding and coated metal arc welding.
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