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Bronze typically refers to a family of alloys with copper as the base, primarily alloyed with elements such as tin, aluminum, silicon, and manganese. Compared to brass (copper-zinc alloys), bronze generally offers higher strength, a lower coefficient of friction, and better chemical corrosion resistance (especially against seawater). Its outstanding wear resistance and self-lubricating properties make it irreplaceable in bearing and bushing applications.
1. C93200 / SAE 660 (High-Leaded Tin Bronze - Bearing Bronze)
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Characteristics: This is the most widely used bearing bronze. The added lead forms soft particles within the alloy, providing excellent self-lubricating and anti-galling properties, making it ideal for operation under insufficient lubrication or high-load, low-speed conditions. It is easy to machine and offers good wear resistance.
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Typical Applications: General-purpose bearings, bushings, thrust washers, pump components, low-load gears.
C93200 Typical Properties (As Sand-Cast)
| 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 |
| Note: Values are typical ranges, specific to casting and processing conditions. | ||
2. C95400 (Aluminum Bronze)
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Characteristics: A high-strength, high-hardness aluminum bronze. Its corrosion resistance, wear resistance, and fatigue strength are among the best of all bronzes, with performance comparable to many steels. It retains strength at elevated temperatures and offers excellent impact and cavitation resistance.
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Typical Applications: Heavy-duty bearings, gears, valve seats, pump housings, propellers and components for seawater use, chemical processing equipment.
C95400 Typical Properties (Heat-Treated Condition)
| 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 |
| Note: Values are typical ranges, specific to heat treatment condition. | ||
3. C54400 (Phosphor Bronze)
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Characteristics: A tin bronze containing a small amount of phosphorus. Phosphorus increases the alloy's elastic limit, fatigue strength, and wear resistance. This material offers excellent spring properties, good wear and corrosion resistance, and is easily machined into precision parts.
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Typical Applications: Electrical connectors, springs, diaphragms, bellows, wear plates, precision gears.
C54400 Typical Properties (Cold Worked Condition)
| 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 |
| Note: Values are typical ranges, specific to the degree of cold work. | ||
4. C65500 (High-Silicon Bronze)
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Characteristics: A bronze with excellent corrosion resistance, particularly outstanding in sulfuric acid and sulfate environments. It combines high strength, high corrosion resistance, and good formability and weldability, making it widely used in chemical and marine industries.
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Typical Applications: Chemical processing equipment components, heat exchanger tube sheets, marine fittings, pump valves, fasteners, welded structures.
Frequently Asked Questions
What is the difference between bronze and brass?
Bronze is primarily a copper-tin alloy (or copper alloyed with aluminum, silicon, etc.), while brass is a copper-zinc alloy. Bronze generally offers higher strength, better wear resistance, and superior corrosion resistance compared to brass, especially in seawater environments.
Which bronze grade is best for bearing and bushing applications?
C93200 (SAE 660 High-Leaded Tin Bronze) is the most widely used grade for bearings and bushings. Its high lead content provides excellent self-lubricating properties and anti-galling performance, making it ideal for high-load, low-speed, or poorly lubricated conditions.
Is aluminum bronze (C95400) suitable for seawater applications?
Yes. C95400 aluminum bronze offers outstanding corrosion resistance in seawater environments, along with high strength and excellent cavitation resistance. It is commonly used for marine propellers, pump housings, and valve components exposed to seawater.
What role does phosphorus play in C54400 Phosphor Bronze?
Phosphorus acts as a deoxidizer during casting and significantly improves the alloy's elastic limit, fatigue strength, and wear resistance. This makes C54400 particularly well-suited for spring elements, electrical connectors, and precision mechanical components that require high fatigue life.
Why is C65500 High-Silicon Bronze preferred in chemical processing industries?
C65500 exhibits exceptional resistance to sulfuric acid and sulfate environments, which are common in chemical processing. In addition to its superior corrosion resistance, it also offers high strength, good formability, and excellent weldability, making it a reliable choice for chemical equipment, heat exchangers, and marine fittings.
How do I choose the right bronze alloy grade for my application?
Selecting the right bronze grade depends on several factors: the operating environment (corrosive media, temperature), mechanical load requirements (strength, hardness, fatigue), lubrication conditions, and machinability needs. For general bearings, C93200 is the standard choice; for heavy-duty or marine use, C95400 is preferred; for spring or electrical components, C54400 excels; and for chemical or welded structures, C65500 is ideal.
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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