CuZn36Pb3 vs CuZn39Pb3: Both leaded free-cutting brasses — different Zn content
CuZn36Pb3 vs CuZn39Pb3
Side-by-side chemical composition and mechanical property comparison.
Overview
CuZn36Pb3
CW603N
Free-cutting leaded brass — the benchmark for non-ferrous machinability (rated 100%). Lead particles act as chip breakers for excellent surface finish. Used for screw machine parts, fittings, valves, watch components, precision mechanics, and electrical connectors. Old DIN number 2.0375.
CuZn39Pb3
2.0401
The most widely used free-cutting brass (machinability index 100%). Excellent for high-speed automatic lathe work. Used for turned parts, faucets, valves, fittings, screws, nuts, electrical connectors, and watch components. Also known as MS58.
| CuZn36Pb3 | CuZn39Pb3 | |
|---|---|---|
| Material Number | CW603N | 2.0401 |
| Category | Copper & Brass | Copper & Brass |
| Standard | EN 12164 | EN 12164 |
Chemical composition (wt%)
| Element | CuZn36Pb3 | CuZn39Pb3 | Overlap |
|---|---|---|---|
| Ni | 0–0.3% | 0–0.3% | OK |
| Cu | 60–63% | 57–59% | No overlap |
| Al | 0–0.05% | 0–0.05% | OK |
| Pb | 2.5–3.5% | 2.5–3.5% | OK |
Mechanical properties
| Property | CuZn36Pb3 | CuZn39Pb3 | Unit |
|---|---|---|---|
| tensile_strength | ≥ 340 | ≥ 360 | MPa |
| yield_strength | ≥ 280 | ≥ 150 | MPa |
| elongation | ≥ 10 | ≥ 15 | % |
Compatibility Assessment
CuZn39Pb3 has higher Zn (lower Cu, cheaper) and is better for hot stamping. CuZn36Pb3 has better cold formability and slightly better corrosion resistance. Both have excellent machinability.
Frequently Asked Questions
Is CuZn36Pb3 the same as CuZn39Pb3?
CuZn36Pb3 and CuZn39Pb3 have a 80% composition overlap. Both leaded free-cutting brasses — different Zn content
Can I replace CuZn36Pb3 with CuZn39Pb3?
In many cases, yes. The compositions overlap significantly (80%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between CuZn36Pb3 and CuZn39Pb3?
The main differences are in the following elements: Cu. CuZn36Pb3 is a Copper & Brass grade, while CuZn39Pb3 is a Copper & Brass grade.
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Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.