C94700 Tin Bronze (heat treated)
Copper Alloy No. C94700 HT
Heat Treated Nickel Tin Bronze CDA 947
Chemical Composition % by weight
Heat Treated Nickel Tin Bronze CDA 947
Chemical Composition % by weight
| Element | Nominal | Minimum | Maximum |
| Aluminum | - | - | .005 |
| Antimony | - | - | .15 |
| Copper | 88 | 85 | 90 |
| Iron | - | - | .25 |
| Lead | - | - | .01 |
| Manganese | - | - | .20 |
| Nickel | 5 | 4.5 | 6 |
| Phosphorus | - | - | .05 |
| Silicon | - | - | .005 |
| Sulfur | - | - | .05 |
| Tin | 5 | 4.5 | 6 |
| Zinc | 2 | 1 | 2.5 |
Applications
Valve stems and bodies, bearings, wear guides, shift forks, feeding mechanisms, circuit breaker parts, gears, piston cylinders, nozzles.
Mechanical Properties
M07/TF00 As Continuous Cast, Solution and Precipitation Heat Treated
| Hardness* | Brinell Hardness (3000 kg load) | 180 |
| Tensile Strength** | KSI | 75 min |
| Yield Strength ** | KSI (0.5% Ext. under load) | 50 min |
| Elongation** | % in 2 inch | 5 min |
**Test values are nominal approximations and depend on specimen size and orientation.
Physical Properties
| Thermal Conductivity | BTU/ (sq ft-ft-hr-F) | 31.2 |
| Specific Heat | BTU/lb/ºF @ 68F | .09 |
| Thermal Expansion | Per °F from 68 F to 392 F | .000011 |
| Density | lb/cu in @ 68 F | .320 |
| Electrical Conductivity* (Annealed) | % IACS @ 68 F | 15 |
| Modulus of Elasticity | KSI | 15,000 |
*Volume basis
Fabrication Practices
| Stress relieving temperature | 500 F or 260 C |
| Time at temperature | 1 hour per inch of section thickness |
| Responds to heat treatment | Yes |
| Solution heat treating temperature | 1425-1475 F or 775-800 C |
| Time at temperature | 2 hours per inch of section thickness |
| Quenching medium | Water |
| Precipitation hardening temperature | 580-620 F or 305-325 C |
| Time at temperature | 5 hours |
| Quenching medium | Air |
| Machinability rating (Free Cutting Brass=100) | 30 |
| Suitability for being joined by: | Soldering/Excellent |
| Brazing/Excellent* | |
| Oxyacetylene Welding/Fair | |
| Carbon Arc Welding/Not Recommended | |
| Gas Shielded Arc Welding/Good | |
| Coated Metal Arc Welding/Good |