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China Bronze CNC Machining Service - Precision Parts from Leading Suppliers and Factory
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.
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 |
ⓘ Note: Values are typical ranges, specific to casting and processing conditions.
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 |
ⓘ Note: Values are typical ranges, specific to heat treatment condition.
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 |
ⓘ Note: Values are typical ranges, specific to the degree of cold work.
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 (FAQ)
Q
What is the difference between bronze and brass?
Bronze is primarily a copper-based alloy combined with tin, aluminum, silicon, or other elements, while brass is a copper-zinc alloy. Bronze generally offers higher strength, a lower friction coefficient, and superior corrosion resistance—especially in seawater—compared to brass. Bronze is preferred for heavy-duty, high-wear, or marine applications, whereas brass is more commonly used for decorative or low-friction mechanical parts.
Q
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 provide exceptional self-lubrication and anti-galling performance, making it ideal for high-load, low-speed, or inadequately lubricated operating conditions.
Q
Is aluminum bronze suitable for marine environments?
Yes. C95400 Aluminum Bronze is highly suitable for marine environments. It offers outstanding corrosion resistance in seawater, excellent fatigue strength, and high impact resistance. It is commonly used in marine propellers, pump housings, valve seats, and other seawater-exposed components. Its strength is comparable to low-alloy steels, making it one of the most robust bronze alloys available.
Q
What makes phosphor bronze (C54400) suitable for electrical connectors and springs?
Phosphor Bronze C54400 contains a small addition of phosphorus, which significantly enhances the alloy's elastic limit, fatigue strength, and wear resistance. These properties give it excellent spring characteristics, allowing it to maintain its shape and mechanical performance under repeated stress cycles. Combined with good electrical conductivity and corrosion resistance, it is ideal for electrical connectors, springs, diaphragms, and precision components.
Q
Can these bronze alloys be CNC machined into custom parts?
Absolutely. All the bronze grades listed—C93200, C95400, C54400, and C65500—are compatible with CNC machining processes. Our machining centers are fully equipped to handle these materials, supporting everything from complex prototype development to small-batch and production-scale manufacturing. Each alloy has its own machinability characteristics, and our engineering team can recommend the optimal tooling and parameters for each grade.
Q
Why is C65500 High-Silicon Bronze preferred in chemical processing applications?
C65500 High-Silicon Bronze is particularly valued in chemical processing due to its exceptional resistance to sulfuric acid and sulfate environments—conditions that can rapidly degrade many other metals. In addition to its superior corrosion resistance, it offers high strength, good formability, and excellent weldability, making it well-suited for fabricating heat exchanger tube sheets, pump and valve components, fasteners, and welded structural assemblies in demanding chemical and marine environments.
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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