What is C90300 Navy G Bronze?
C90300 Navy G bronze is a high-tin cast bronze used for bearings, bushings, gears, valves, pump parts, and marine-related service. It is commonly referenced as Navy G, SAE 620, or high-tin bronze in U.S. material and purchasing discussions.
Compared with leaded bearing bronze, C90300 has higher tin content and no intentional high lead addition. It is often considered for high-load, low-speed bearing service, gear components, and bronze parts that need good strength with corrosion resistance.
Common Names and Cross References
| Name or designation | How it is commonly used |
|---|---|
| C90300 | UNS alloy designation |
| Navy G | Common bronze trade and purchasing name |
| SAE 620 | Common bearing bronze designation |
| High-tin bronze | Alloy family description |
| Tin bronze | General material family |
Chemical Composition (%)
| Element | Minimum | Maximum | Nominal |
|---|---|---|---|
| Copper (Cu) | 86.0 | 89.0 | - |
| Tin (Sn) | 7.5 | 9.0 | - |
| Zinc (Zn) | 3.0 | 5.0 | - |
| Nickel (Ni) | - | 1.0 | - |
| Lead (Pb) | - | 0.30 | - |
| Iron (Fe) | - | 0.20 | - |
Mechanical and Physical Properties
Properties vary by casting method and section size. The values below reflect common U.S. datasheet ranges for C90300.
| Property | Typical published value |
|---|---|
| Tensile strength | 40,000 psi minimum, sand or centrifugal cast |
| Tensile strength | 44,000 psi minimum, continuous cast |
| Yield strength | 18,000 psi minimum, sand or centrifugal cast |
| Yield strength | 22,000 psi minimum, continuous cast |
| Elongation | 18-20% minimum |
| Brinell hardness | About 70 HB, typical |
| Density | 0.318 lb/in3 |
| Electrical conductivity | 12% IACS |
| Modulus of elasticity | 14,000 ksi |
| Machinability rating | 30, based on free-cutting brass = 100 |
Fabrication and Welding Suitability
| Operation | Suitability |
|---|---|
| Machining | Fair to good |
| Soldering | Excellent |
| Brazing | Good |
| Oxyacetylene welding | Fair |
| Gas shielded arc welding | Fair |
| Coated metal arc welding | Fair |
Typical Applications for C90300
- High-load, low-speed bearings and bushings.
- Gears, worm gears, and bronze gear components.
- Valves, valve bodies, and seal rings.
- Pump impellers and pump components.
- Marine and corrosion-resistant bronze service.
RFQ Details for C90300 Parts
Send the alloy callout, casting method if specified, OD, ID, length, gear or valve drawing, quantity, tolerances, and certification requirements. For general-purpose bearing bronze, also compare C93200 / SAE 660; for heavier strength requirements, compare C95400 aluminum bronze.
Available Forms
Available Forms and Shapes
Review common product forms for C90300 Navy G Bronze, then send drawings, dimensions, quantity, and finished-part requirements for material and production guidance.
Bronze Solid Bar
Bronze solid round bar and rod stock for machining bushings, bearings, pins, spacers, gears, and custom bronze parts.
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Bronze Cored Bar
Bronze cored bar and hollow bar stock for efficient machining of sleeve bushings, bearings, rings, and bronze components.
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Plain Bronze Sleeve Bushings
Plain bronze sleeve bushings and cast bronze sleeve bearings in C93200 SAE 660 and alternative alloys for radial load applications.
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Flanged Bronze Bushings
Flanged bronze bushings and cast bronze sleeve bearings with an integral thrust face for radial support and axial location.
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Custom CNC Bronze Parts
Custom CNC machined bronze components, bushings, lead screw nuts, wear parts, and replacement parts made from drawings or samples.
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