CNC Machining
Bronze
Bronze alloys are engineered for endurance. Offering exceptional low-friction properties, high load-bearing capacity, and superior resistance to seawater corrosion, bronze is the ultimate material for heavy-duty bushings, marine hardware, and precision wear plates.
Core Mechanical Properties
The "Bronze" family encompasses vastly different alloys. Below is the typical mechanical data comparing standard bearing bronze, high-strength aluminum bronze, and fatigue-resistant phosphor bronze.
| Alloy Grade | Yield Strength | Tensile Strength | Hardness |
|---|---|---|---|
| C932 (SAE 660) | ~ 125 MPa | ~ 240 MPa | ~ 65 HB (Brinell) |
| C954 (Aluminum Bronze) | ~ 220 MPa | ~ 585 MPa | ~ 170 HB (Brinell) |
| C510 (Phosphor Bronze) | ~ 330 MPa | ~ 400 MPa | 75 - 85 HRB (Rockwell) |
International Grade Comparison
Use our cross-reference chart to match American standards (ASTM/SAE) with European (EN) and Chinese (GB) bronze material equivalents.
| ASTM / SAE (USA) | EN (Europe) | GB (China) | Key Characteristics |
|---|---|---|---|
| C93200 (SAE 660) | CuSn7Zn4Pb7 | ZCuSn7Pb4Zn6 | High-leaded tin bronze. Exceptional anti-friction qualities and easy to machine. The industry standard for bearings. |
| C95400 | CuAl10Fe2 | ZCuAl10Fe3 | Aluminum bronze. Extremely high strength and wear resistance. Withstands severe marine and chemical corrosion. |
| C51000 | CuSn5 | QSn6.5-0.1 | Phosphor bronze. Known for its superb fatigue resistance, elasticity, and formability. Ideal for electrical springs and contacts. |
Hardcore Industrial Applications
Bronze alloys are specifically deployed in environments where parts rub against each other under massive loads or operate in corrosive seawater.
Heavy-Duty Bearings & Bushings
Machined from SAE 660 (C932), these precision turned sleeves self-lubricate, preventing galling against steel shafts in industrial machinery and automotive assemblies.
Marine Hardware & Propellers
Aluminum Bronze (C954) resists cavitation, erosion, and marine bio-fouling. We 5-axis mill complex impellers and pump housings for subsea applications.
Wear Plates & Worm Gears
Due to its high strength and low coefficient of friction against steel, bronze is precision-milled into wear plates and gears for heavy construction equipment.
Expert Machining Tips
While leaded bearing bronzes are relatively easy to machine, alloys like Aluminum Bronze (C954) behave more like steel. Our engineers optimize toolpaths accordingly:
- 1
Rigid Setups for Aluminum Bronze
C954 is extremely tough and can cause tool deflection. We ensure ultra-rigid fixturing and use coated carbide inserts to handle the high cutting forces and prevent chatter marks.
- 2
Proactive Chip Control
Unlike free-machining brass that chips into powder, Phosphor Bronze (C510) tends to produce long, stringy, bird-nesting chips. We utilize specific chip-breaker geometries and peck-drilling cycles to clear holes safely.
- 3
High-Lubricity Coolant
Bronze can generate significant heat at the cutting edge. Applying a rich, high-lubricity coolant flood prevents the copper from softening and adhering to the tool (built-up edge), ensuring a pristine surface finish.
Top 3 Surface Treatments
Most bronze components are deployed purely for their mechanical or aesthetic properties without coating, but certain applications require targeted post-processing.
1. As-Machined / Polishing
Bronze has a beautiful, warm, reddish-gold hue. For decorative or architectural hardware, we offer multi-stage mechanical polishing to achieve a mirror-like finish directly from the raw material.
2. Electroless Nickel Plating
In extreme chemical or high-wear environments where bare bronze may eventually tarnish or react, a layer of nickel-phosphorus provides a hard, highly corrosion-resistant shield.
3. Clear Lacquer (Anti-Tarnish)
Untreated bronze will slowly oxidize into a green patina. Applying a thin, durable clear coating preserves the polished, metallic aesthetic indefinitely for visible components.
Start Your Manufacturing RFQ
Upload your 3D CAD files today. Our engineering team will review your bronze specifications and provide a free DFM report along with rapid pricing.