C90300 Tin Bronze, also known as Navy G and SAE 620, is a copper base that is alloyed with zinc and tin. C903 offers excellent corrosion resistance with high wear resistance and low coefficient of friction. CDA 903 Gear Bronze is well suited for applications involving high loads and low speeds. C903 Tin Bronze is available as centrifugal cast, continuous cast and sand cast. CDA
903 Navy G bronze has a wide variety of uses, including bushings, bearings, gear blanks, pump bodies, valve bodies and steam fittings.
Marmetal stock C90300 Tin Bronze in cast solid rounds.
Specifications for for C90300 Tin Bronze
| ASTM | MILITARY | |
| Centrifugal Cast | ASTM B271 | QQ-C-390 |
| Continuous Cast | ASTM B505 | QQ-C-390 |
| Sand Cast | ASTM B548 | QQ-C-390 |
Mechanical Properties for C90300 Tin Bronze
| Form | Specification | Tensile, min ksi (MPa) | Yield, min ksi (MPa) | Elongation in 2”, % min |
| Centrifugal Cast | ASTM B271 | 40 (276) | 18 (124) | 20 |
| Continuous Cast | ASTM B505 | 44 (303) | 22 (152) | 18 |
| Sand Cast | ASTM B584 | 40 (276) | 18 (124) | 20 |
Compositions for C90300 Tin Bronze
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COMMERCIAL
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| UNS No. | Copper | Tin | Lead | Zinc | Nickel incl. Cobalt | Iron | Antimony | Sulfur | Phosphorus | Aluminum | Silicon | |
| C90300 | 86.0-89.0 | 7.5-9.0 | 0.30 max | 3.0-5.0 | 1.0 max | 0.20 max | 0.20 max | 0.05 max | 0.05 max | 0.005 max | 0.005 max | |
| QQ-C-390 | ||||||||||||
| UNS No. | Copper | Tin | Lead | Zinc | Nickel incl. Cobalt | Iron | Antimony | Sulfur | Phosphorus | Aluminum | Silicon | |
| C90300 | 86.0-89.0 | 7.5-9.0 | 0.30 max | 3.0-5.0 | 1.0 max | 0.20 max | 0.20 max | 0.05 max | 0.05 max | 0.005 max | 0.005 max |
Physical Properties for for C90300 Tin Bronze
| Density @ 68o F | 0.318 lb/in3 |
| Melting Range | 1570-1832o F |
| Casting Yield | Medium |
| Drossing | Low |
| Effect on Section Size | High |
| Fluidity | Medium |
| Gassing | Medium |
| Machinability rating (C360 = 100) | 30 |
| Brazing | Good |
| Soldering | Excellent |
| Gas-shielded arc welding | Fair |
| Oxy-acetylene welding | Fair |
| Coated metal-arc welding | Fair |
Applications for C90300 Tin Bronze
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* Bushings
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* Bearings
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* Gear Blanks
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* Pump Bodies
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* Valve Bodies
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* Steam Fittings
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* Piston Rings
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* Pump Impellers
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* Seal Rings
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* Worm Wheels
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