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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)
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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.
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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 |
Values are typical ranges, specific to casting and processing conditions.
2. C95400 (Aluminum Bronze)
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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.
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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 |
Values are typical ranges, specific to heat treatment condition.
3. C54400 (Phosphor Bronze)
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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.
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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 |
Values are typical ranges, specific to the degree of cold work.
4. C65500 (High-Silicon Bronze)
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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.
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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
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What is the difference between bronze and brass, and how do I choose the right one?
Bronze is a copper-based alloy primarily alloyed with tin, aluminum, silicon, or other elements, while brass is a copper-zinc alloy. Bronze generally offers higher strength, a lower friction coefficient, and better corrosion resistance—especially in seawater. Brass, on the other hand, is easier to machine and more cost-effective for decorative or low-load applications. If your application involves heavy loads, wear, or harsh chemical environments, bronze is typically the preferred choice.
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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 creates soft particles within the alloy structure that act as a built-in lubricant, providing excellent anti-galling and self-lubricating performance. It is especially effective under high-load, low-speed, or poorly lubricated conditions—making it the industry standard for bearing bronze.
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Is aluminum bronze (C95400) suitable for marine environments?
Yes. C95400 Aluminum Bronze is one of the best choices for marine applications. It offers outstanding resistance to seawater corrosion, cavitation, and biofouling, along with very high strength and hardness comparable to low-alloy steels. It is commonly used for marine propellers, pump housings, valve components, and other seawater-exposed parts where both strength and corrosion resistance are critical.
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What makes phosphor bronze (C54400) ideal for electrical connectors and springs?
Phosphor Bronze (C54400) contains a small amount of phosphorus that significantly enhances its elastic limit, fatigue strength, and wear resistance. This gives the material excellent spring-back characteristics, allowing it to maintain its shape under repeated flexing without permanent deformation. Combined with good electrical conductivity and corrosion resistance, it is the go-to material for electrical connectors, springs, diaphragms, and precision contact components.
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Can bronze alloys be machined into complex precision parts?
Absolutely. Most bronze alloys—particularly C93200 and C54400—are known for their excellent machinability. They can be CNC-turned, milled, drilled, and ground to tight tolerances, making them well-suited for complex prototype and small-batch production. Our machining centers are fully equipped to handle a wide range of bronze grades, producing precision components that meet demanding dimensional and surface finish requirements.
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Why is C65500 High-Silicon Bronze preferred in chemical processing equipment?
C65500 High-Silicon Bronze is specifically valued for its exceptional resistance to sulfuric acid, sulfate solutions, and other corrosive chemical media that would quickly degrade other alloys. In addition to its superior corrosion resistance, it offers high strength, good formability, and excellent weldability—making it suitable for fabricating complex welded structures such as heat exchanger tube sheets, pump and valve bodies, and chemical storage components where both durability and chemical compatibility are essential.
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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