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Common Bronze Alloy Grades and Characteristics
Bronze generally refers to a group of copper‑based alloys, mainly alloyed with tin, aluminum, silicon, manganese, and other elements. Compared with brass (copper‑zinc alloys), bronze typically features higher strength, a lower friction coefficient, and better chemical corrosion resistance—especially in seawater environments. Thanks to its excellent wear resistance and self‑lubricating properties, it plays an irreplaceable role in bearings and bushings. Our machining centers are well‑equipped to process various bronze materials, supporting high‑quality production from complex prototypes to small‑batch manufacturing.
1. C93200 / SAE 660 (High-Leaded Tin Bronze - Bearing Bronze)
Characteristics: This is the most commonly used bearing bronze grade. Lead is added to form soft particles in the alloy structure, delivering exceptional self-lubrication and anti-galling performance. This makes it particularly suitable for applications with insufficient lubrication, or under high-load and low-speed operating conditions. It features good machinability and reliable wear resistance.
Typical Applications: Suitable for general‑purpose bearings, bushings, thrust washers, pump components, and low‑load gears across various industrial applications.
| Property | Value | Notes |
|---|---|---|
| Tensile Strength (MPa) | 240 - 330 | Good overall strength |
| Yield Strength (0.5% Extension, MPa) | 124 | - |
| Elongation at Break (%) | 18 | Good ductility |
| Hardness (Brinell) | 65 | - |
| Density (g/cm³) | 8.93 | - |
| Key Composition | Cu-83%, Sn-7%, Pb-7%, Zn-3% | High lead content provides self-lubrication |
2. C95400 (Aluminum Bronze)
Characteristics: This is a high‑strength, high‑hardness aluminum bronze. It boasts some of the best corrosion resistance, wear resistance, and fatigue strength among all bronze alloys, with performance comparable to many steel materials. It maintains its strength at elevated temperatures and delivers excellent resistance to impact and cavitation.
Typical Applications: Ideal for heavy-duty bearings, gears, valve seats, pump housings, marine propellers and seawater-resistant components, as well as various parts used in chemical processing equipment.
| Property | Value | Notes |
|---|---|---|
| Tensile Strength (MPa) | 620 - 760 | Very high strength, comparable to low-alloy steels |
| Yield Strength (0.2% Offset, MPa) | 275 | - |
| Elongation at Break (%) | 12 - 18 | - |
| Hardness (Brinell) | 170 - 210 | High hardness, very wear-resistant |
| Density (g/cm³) | 7.45 | Lighter than tin bronze |
| Key Composition | Cu-85%, Al-11%, Fe-4% | Tin-free, uses aluminum and iron as main alloying elements |
3. C54400 (Phosphor Bronze)
Characteristics: This is a tin bronze with a small addition of phosphorus. Phosphorus enhances the alloy’s elastic limit, fatigue strength, and wear resistance. The material exhibits excellent spring characteristics, good wear and corrosion resistance, and can be readily machined into precision components.
Typical Applications: Perfect for electrical connectors, springs, diaphragms, bellows, wear plates, and high-precision gears across multiple industrial applications.
| Property | Value | Notes |
|---|---|---|
| Tensile Strength (MPa) | 520 - 690 | High strength, especially suitable for elastic elements |
| Yield Strength (0.2% Offset, MPa) | 380 - 550 | High yield strength |
| Elongation at Break (%) | 10 - 15 | - |
| Hardness (Rockwell B) | 78 - 90 | - |
| Density (g/cm³) | 8.8 | - |
| Key Composition | Cu-88%, Sn-4%, Zn-4%, P-0.2-0.5% | Phosphorus acts as a deoxidizer and enhances properties |
4. C65500 (High-Silicon Bronze)
Characteristics: This bronze features exceptional corrosion resistance, especially in sulfuric acid and sulfate environments. It combines high strength, excellent corrosion resistance, good formability and weldability, making it widely applied in the chemical and marine industries.
Typical Applications: Ideal for components in chemical processing equipment, heat exchanger tube sheets, marine hardware and fittings, pump and valve parts, fasteners, as well as welded structural parts.
Frequently Asked Questions
What is the primary difference between brass and bronze?
Bronze is a copper-based alloy primarily mixed with tin, aluminum, silicon, or manganese, whereas brass is an alloy of copper and zinc. Bronze generally offers higher strength, lower friction, and superior corrosion resistance, particularly in seawater.
Why is C93200 / SAE 660 referred to as bearing bronze?
C93200 contains added lead, which creates soft particles within the alloy structure. This composition delivers outstanding self-lubricating and anti-galling performance, making it the industry standard for bushings and bearings operating under high-load, low-speed conditions.
When should I choose C95400 Aluminum Bronze over other grades?
C95400 is ideal for heavy-duty applications requiring high tensile strength and hardness comparable to steel. It provides exceptional resistance to wear, fatigue, impact, and cavitation, making it perfect for marine and heavy machinery components.
What benefits does phosphorus add to C54400 Phosphor Bronze?
Phosphorus acts as a deoxidizer during alloying and enhances the material's elastic limit, fatigue strength, and wear resistance. This gives C54400 excellent spring properties, making it highly suitable for electrical connectors, diaphragms, and bellows.
What makes C65500 High-Silicon Bronze suitable for chemical industries?
C65500 features exceptional chemical corrosion resistance, particularly in sulfuric acid and sulfate environments. Combined with its high strength, excellent formability, and weldability, it is highly valued for chemical processing equipment and marine hardware.
Finishes and Post-Processing Options
The zinc alloy substrate is highly suitable for various surface treatments to enhance decoration, protection, or functionality:
Electroplating: Such as chrome, nickel, gold, or silver plating, providing a highly decorative appearance, excellent wear and corrosion resistance. This is the most common choice.
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Passivation or Chromate Conversion Coating:
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Powder Coating:
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Painting:
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Physical Vapor Deposition (PVD):
Design and Machining Considerations
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Process Selection:
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Design Considerations:
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Material Selection:
Zamak 3 and 5 are suitable for the vast majority of general-purpose parts requiring good appearance and strength; ZA-8 is better for wear and bearing applications; for making rapid tooling, choose specialized alloys like Kirksite.
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