| Item | Specification / Parameter |
|---|---|
| Material Name | C90300 Solid Copper Round Rod (Tin Bronze / Navy “G” Bronze) |
| UNS No. | C90300 |
| Common Trade Names | Navy “G” Bronze, Modified Navy G, Tin Bronze 88-8-4 |
| Standards | ASTM B505, ASTM B584, ASTM B271, SAE J461, SAE J462 |
| Chinese Approx. | ZCuSn10Zn2 (similar, not equivalent) |
| Color | Golden-bronze (reddish gold when new; dark brown / green patina over time) |
| Form | Solid round rod / bar |
| Cu (Copper) | 86.0–89.0% (balance) |
| Sn (Tin) | 7.5–9.0% |
| Zn (Zinc) | 3.0–5.0% |
| Pb (Lead) | ≤ 0.30% |
| Fe (Iron) | ≤ 0.20% |
| Ni (Nickel) | ≤ 1.0% |
| Sb (Antimony) | ≤ 0.20% |
| P (Phosphorus) | ≤ 0.05% |
| S (Sulfur) | ≤ 0.08% |
| Al (Aluminum) | ≤ 0.005% |
| Si (Silicon) | ≤ 0.005% |
| Other Impurities (total) | ≤ 0.5% |
| Tensile Strength | 300–400 MPa (44–58 ksi) |
| Yield Strength (0.5%) | 140–200 MPa (20–29 ksi) |
| Elongation | 15–25% |
| Hardness | 70–90 HB |
| Density | 8.8 g/cm³ (0.318 lb/in³) |
| Melting Range | ~900–1000 °C |
| Thermal Conductivity | ~60 W/m·K |
| Electrical Conductivity | ~12–15% IACS |
| Thermal Expansion | ~18 µm/m·°C (20–100 °C) |
| Modulus of Elasticity | ~96–110 GPa |
| Max Working Temp. | ~230–260 °C |
| Diameter Range | 6–300 mm (0.25″–12″) |
| Common Metric Dia. | 10, 12, 16, 20, 25, 30, 40, 50, 60, 80, 100, 120, 150, 200 mm |
| Common Imperial Dia. | 3/8″, 1/2″, 5/8″, 3/4″, 1″, 1-1/4″, 1-1/2″, 2″, 3″, 4″, 6″, 8″, 10″, 12″ |
| Standard Length | 1 m, 2 m, 3 m, 6 m; or 12 ft, 20 ft |
| Length Tolerance | ± 5–10 mm (cut to order available) |
| Diameter Tolerance | ± 0.05–0.5 mm (depending on size & process) |
| Surface Finish | As-cast, machined, ground, or polished |
| Manufacturing Process | Continuous cast, centrifugal cast, sand cast, or extruded |
| Key Properties | High strength, good wear resistance, excellent seawater corrosion resistance, low lead |
| Typical Applications | Bearings, bushings, worm gears, pump & valve parts, marine hardware, steam fittings |
