A proven alloy in a wide number of uses, C90300 (SAE 620) Tin Bronze is most often used in high load, low speed applications. The alloy is hard, strong and can be counted on to withstand wear and corrosion. C90300 can be used for welding, brazing and soldering. Final components made of this alloy require good alignment and lubrication of mated parts.
Also known as: CDA 903, Navy "G" Bronze, Naval Bronze, Gear Bronze, 88-8-0-4, SAE 620, ASTM B-271 Alloy C90300, ASTM B-505 Alloy C90300, ASTM B-271 Alloy C90300, QQC-390 Alloy D5, QQC-390 Rev. A/B Alloy C90300.
| Cu% | Sn% | Pb% | Zn% | Fe% | Ni% | Sb% | P% | S% | AI% | Mn% | Si% |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 86.00- 89.00 |
7.50- 9.00 |
0.30 | 3.00- 5.00 |
0.20 | 1.00 | 0.20 | 1.50 | 0.05 | 0.005 | N/A | 0.005 |
Typical Uses
- Industrial:
- Valves, Potable Water Applications, Gears, Pump Components, Bearings, Bushings, Pump Impellers, Piston Rings, Valve Components, Seal Rings, Steam Fittings, Trunnion Bearings, Wrist-Pin Bushings, Piston-Pin Bushings, Machine Tool Bushings, Roll-Mill Bearings, and Bridge Bearings
- Marine:
- Marine Fittings
- Plumbing:
- Plumbing Fixtures
Alloy Properties
| Tensile Strength, min | 44 ksi | N/A |
|---|---|---|
| Yield Strength @ .5% ext under load min | 22 ksi | N/A |
| Elongation in 2 in. or 50 mm min, % | 18 | |
| Brinell Hardness, min | 70 typical Bhn (500 kg) | |
| Machinability Rating | 30% |
| US Customary | Metric | |
|---|---|---|
| Melting Point-Liquidus | 1832 F | 1000 C |
| Melting Point-Solidus | 1570 F | 854 C |
| Density | 0.318 lb/cu in @ 68 F |
8.81 gm/cu cm @ 20 C |
| Specific Gravity | 8.81 | 8.81 |
| Electrical Resistivity | N/A | N/A |
| Electrical Conductivity | 12 %IACS @ 68 F | .069 Megmho-cm @ 20 C |
| Thermal Conductivity | 43.2 Btu/sq ft/ ft/hr/degree F @ 68 F |
.18 cal/sq cm/ cm/sec/degree C @ 20 C |
| Coefficient of Thermal Expansion |
.000010 per degree F from 68 F to 340 F |
.000018 per degree C from 20 C to 177 C |
| Specific Heat Capacity | .09 Btu/lb/degree F @ 68 F |
.09 cal/gm/degree C @ 20 C |
| Modulus of Elasticity in Tension |
14000 ksi | 9840 Kg/sq mm |
| Magnetic Permeability | N/A | N/A |
| Joining Technique | Suitability |
|---|---|
| Soldering | Excellent |
| Brazing | Good |
| Oxyacetylene Welding | Fair |
| Gas Shielded Arc Welding | Fair |
| Coated Metal Arc Welding | Fair |