C93800 / CDA 938 Leaded Tin Bronze Alloys
Specification :
| CDA | ASTM | Asarcon | SAE | AMS | Federal | Military | Other |
|---|---|---|---|---|---|---|---|
| C938 | B505 B505M B66 B144-3D |
715 | QQ-C-390, E6; QQ-B-1005, COMP 19 |
MIL-B-11553, COMP 19 | Anti-Acid Metal |
Chemical Composition :
| Cu% | Pb% | Sn% | Zn% | Fe% | P%1 | Ni%2 | Al% | S% | Sb% | Si% | |
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Chemical Composition according to ASTM B505/B505M-18
1For continuous castings, P shall be 1.5%, max. 2Ni value includes Co.
Note: Cu + Sum of Named Elements, 99.0% min. Single values represent maximums.
|
|||||||||||
| 75.00- 79.00 |
13.00- 16.00 |
6.30- 7.50 |
0.80 | 0.15 | 0.05 | 1.00 | 0.005 | 0.08 | 0.80 | 0.005 | |
Machinability :
| Copper Alloy UNS No. | Machinability Rating | Density (lb/in3 at 68 °F) |
|---|---|---|
| C938 | 80 | 0.334 |
Mechanical Properties :
|
Mechanical Properties according to ASTM B505/B505M-18
|
|||||||||||
| Tensile Strength, min | Yield Strength, at .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 | ||||||
| 25 | 172 | 16 | 110 | 5 | 55 | ||||||
Physical Properties :
|
Physical Properties provided by CDA
|
|||||||||||
| US Customary | Metric | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Melting Point – Liquidus | 1730 °F | 943 °C | |||||||||
| Melting Point – Solidus | 1570 °F | 854 °C | |||||||||
| Density | 0.334 lb/in3 at 68 °F | 9.25 gm/cm3 at 20 °C | |||||||||
| Specific Gravity | 9.25 | 9.25 | |||||||||
| Electrical Conductivity | 11% IACS at 68 °F | 0.066 MegaSiemens/cm at 20 °C | |||||||||
| Thermal Conductivity | 30.2 Btu/sq ft/ft hr/°F at 68 °F | 52.3 W/m at 20 °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) | |||||||||
| Specific Heat Capacity | 0.09 Btu/lb/°F at 68 °F | 377.1 J/kg at 293 °C | |||||||||
| Modulus of Elasticity in Tension | 10500 ksi | 72400 MPa | |||||||||
| Incipient Melting | 600 °F | 316 °C | |||||||||
| Magnetic Permeability | 1 | 1 | |||||||||
Fabrication Properties :
|
Fabrication Properties provided by CDA
1Since brazing is performed in the hot short temperature range, strain must be avoided during brazing and cooling.
|
|||||||||||
| Joining Technique | Suitability | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Soldering | Good | ||||||||||
| Brazing1 | Poor | ||||||||||
| Oxyacetylene Welding | Not Recommended | ||||||||||
| Gas Shielded Arc Welding | Not Recommended | ||||||||||
| Coated Metal Arc Welding | Not Recommended | ||||||||||
Thermal Properties :
|
Thermal Properties provided by CDA
|
|||||||||||
| Treatment | Temp./Time – US | Temp./Time – SI | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Stress Temperature | 500 | 260 | |||||||||
| Solution Minimum | |||||||||||
| Solution Maximum | |||||||||||
| Solution Time | 0.0 | ||||||||||
| Solution Medium | |||||||||||
| Precipitation Value | |||||||||||
| Precipitation Time | |||||||||||
| Precipitation Medium | |||||||||||
| Annealing Minimum | |||||||||||
| Annealing Maximum | |||||||||||
| Annealing Time | |||||||||||
| Hot Works Minimum | |||||||||||
| Hot Works Maximum | |||||||||||