Manganese Bronze
C86300 — High-Strength Manganese Bronze
A very high-strength cast “manganese bronze” (technically a high-tensile brass) for heavy-load gears, bearings and slow-speed components.
Grade overview
C86300 is the highest-strength grade among the commonly cast copper alloys. Its microstructure, strengthened with aluminum, manganese and iron in a copper-zinc matrix, gives very high strength and hardness with good wear resistance for slow-speed, heavily loaded applications.
It is not a tin bronze: although traded as manganese bronze, it is a copper-zinc high-tensile alloy. Its corrosion resistance, particularly in sea water and in the presence of stagnant or aggressive fluids, is more limited than aluminum or nickel-aluminum bronzes, and it is subject to dezincification in some environments.
Alloy family and identification
Cast copper-zinc-aluminum-manganese-iron alloy, UNS C86300, commonly “high-strength manganese bronze”. Often specified in ASTM B147.
| Item | Detail |
|---|---|
| UNS designation | C86300 |
| Common name | High-Strength Manganese Bronze |
| Alloy family | Manganese Bronze |
| Type | Cast copper-zinc-aluminum-manganese-iron alloy |
Typical composition
| Element | Nominal limit, wt % |
|---|---|
| Copper (Cu) | 60.0 – 66.0 |
| Zinc (Zn) | 22.0 – 28.0 |
| Aluminum (Al) | 5.0 – 7.5 |
| Manganese (Mn) | 2.5 – 5.0 |
| Iron (Fe) | 2.0 – 4.0 |
| Nickel (Ni, incl. Co) | 1.0 max |
| Tin (Sn) | 0.20 max |
| Lead (Pb) | 0.20 max |
Reference data only – typical or nominal values from published specifications, not a guarantee of supplied material. Confirm against the current edition of the applicable specification, the product form and condition, and the material test certificate. Technical review by the company is required before publication or reliance.
Typical mechanical properties
Mechanical property values are intentionally not published here. They vary with specification, product form, size and temper or condition and will be added only once the governing specification and condition are confirmed. Request the applicable specification or test certificate with your inquiry.
Physical properties
Physical properties (density, thermal and electrical data) are not listed until verified against an authoritative datasheet. Contact us for current reference data.
Corrosion and wear considerations
Adequate atmospheric and fresh-water resistance. It is more susceptible than aluminum bronzes to dezincification and stress corrosion in certain environments and is not the usual choice for sustained sea-water service. Evaluate the environment carefully.
Machinability and fabrication
Machinable with suitable tooling at moderate rates. Hard and strong, so tool wear is notable. Weld repair requires qualified procedures.
Common industrial applications
- Heavy-load gears and worm gears
- Slow-speed bearings and wear plates
- Valve stems and guides (design dependent)
- Press and mining equipment components
- Large structural bronze parts
Examples only. Suitability must be confirmed for the actual operating environment.
Available product forms
Sizes, tolerances and stock are not published and must be confirmed with the company.
Relevant products
Standards and specifications
- ASTM B147/B147M – aluminum-bronze and manganese-bronze sand castings (coverage to be confirmed)
Verify against the current edition and the exact product form before specifying.
Certification and inspection options
Material test certificates, chemical analysis, dimensional reports and third-party inspection can be requested with your inquiry. What can be supplied for C86300 is confirmed with the company for each order; no certificate is implied by this page.
Related grades
Frequently asked questions
Is manganese bronze a true bronze?
Commercially it is called bronze but it is a high-tensile copper-zinc alloy. This site follows the industry naming.
Is C86300 suitable for sea water?
Generally not preferred – aluminum or nickel-aluminum bronzes are the usual sea-water choices. Confirm for the service in question.
Need C86300 in a specific form?
Share your grade, dimensions, quantity and technical requirements with our team.