C93200 is a copper alloy belonging to the leaded gun metal family. It's known for its excellent
machinability, good wear resistance, and good bearing properties. However, similar to other high-lead
alloys, its applications are limited due to environmental and health concerns.
Table: Key Properties of C93200
| Property |
Description |
| Chemical Composition |
- Primarily Copper (Cu): 81-85% <br> - Tin (Sn): 7-9% <br> - Lead (Pb): 7-9%
<br> - Zinc (Zn): 3-5% <br> - Other (Fe, etc.): Trace amounts
|
| Mechanical Properties |
- Excellent machinability due to high lead content <br> - Good wear resistance and bearing
properties <br> - Moderate strength and fair corrosion resistance
|
| Common Brands (By Country) |
- Europe: CuSn7Pb7Zn3 [Europe] <br> - US: SAE 660 Bearing Bronze |
Common Questions and Answers:
What are the typical applications of C93200?
The use of C93200 is declining due to lead content. However, some traditional applications include:
Bearings and bushings: In low-load applications where machinability and wear resistance are
important, C93200's properties make it suitable for bearings and bushings.
Gears: Low-load gears can benefit from C93200's machinability and wear resistance.
Wear plates: C93200 can be used for wear plates in applications with moderate loads.
Important Note: Regulations on lead usage can make finding readily available C93200 or its
equivalents challenging. Explore alternative copper alloys with lower lead content for most applications.
What are the limitations of using C93200?
The main limitations of C93200 are:
High lead content: Lead is a health hazard during machining and limits applications due to
environmental regulations.
Moderate strength: Compared to other copper alloys, C93200 offers moderate strength, making
it unsuitable for demanding applications.
Fair corrosion resistance: C93200 is not ideal for environments with high corrosion
potential.
Are there lead-free alternatives to C93200?
Several lead-free copper alloys offer better overall properties. Depending on the specific application
requirements, some options include:
C93700: A lead-free alternative with good machinability and wear resistance for bearings and bushings.
Aluminum bronzes (e.g., C95400): Offer good strength, wear resistance, and machinability without lead.
Important Note: Always consult with a material engineer or supplier to identify the most
suitable copper alloy for your specific application considering factors like strength, wear resistance,
corrosion resistance, and regulatory compliance.
