C46700 naval brass and C36000 free-cutting brass represent two completely different design philosophies:
C46700 → corrosion-resistant, marine-grade brass (Cu-Zn-Al)
C36000 → ultra-machinable industrial brass (Cu-Zn-Pb)
👉 This comparison focuses on three critical engineering factors:
Strength, Corrosion Resistance, and Machinability
What is C36000 Brass?
C36000 (Free-Cutting Brass / Alloy 360) is the most machinable copper alloy available.
Key Features:
Composition: ~60% Cu, ~35–37% Zn, ~3% Pb
Machinability rating: 100% (industry benchmark)
Tensile strength: ~330–530 MPa
Core Advantage:
👉 Lead (Pb) acts as a lubricant + chip breaker, enabling:
High-speed CNC machining
Excellent surface finish
Low tool wear
👉 In short:
C36000 = Best choice for machining efficiency and precision parts
What is C46700 Brass?
C46700 is a naval brass alloy (Cu-Zn-Al) engineered for marine and seawater environments.
Key Features:
Aluminum addition improves:
Strength
Erosion resistance
Corrosion resistance in seawater
Designed for:
Condensers
Heat exchangers
Offshore systems
👉 In short:
C46700 = High-performance marine brass (anti-corrosion + high strength)
Strength Comparison
| Property | C46700 | C36000 |
|---|---|---|
| Tensile Strength | Higher | Moderate (330–530 MPa) |
| Hardness | Higher | Medium |
| Wear Resistance | Excellent | Good |
Key Insight:
C46700 is stronger and more durable
C36000 is sufficient for mechanical parts but not for heavy-duty marine loads
👉 Winner: C46700 (Strength)
Corrosion Resistance Comparison
| Environment | C46700 | C36000 |
|---|---|---|
| Seawater | Excellent | Poor |
| Freshwater | Excellent | Good |
| Industrial atmosphere | Excellent | Good |
| Ammonia resistance | Better | Poor |
C36000 performs well in air and freshwater but can corrode in marine or chemical environments
C46700 is specifically designed for seawater + erosion-corrosion resistance
👉 Winner: C46700 (Corrosion Resistance)
Machinability Comparison
| Factor | C46700 | C36000 |
|---|---|---|
| Machinability | Low–Moderate | ⭐⭐⭐⭐⭐ (Best) |
| Tool Wear | Higher | Very low |
| Surface Finish | Good | Excellent |
| CNC Efficiency | Lower | Extremely high |
C36000 = 100% machinability standard
C46700 = harder, more difficult to cut
👉 Winner: C36000 (Machinability)
Key Differences Summary
| Factor | C46700 | C36000 |
|---|---|---|
| Alloy Type | Cu-Zn-Al | Cu-Zn-Pb |
| Strength | Higher | Moderate |
| Corrosion Resistance | Excellent (marine) | Limited (non-marine) |
| Machinability | Moderate | ⭐ Best in all copper alloys |
| Cost | Higher | Lower |
| Typical Use | Marine / heat exchangers | CNC parts / fittings |
Applications Comparison
C46700 Applications:
Marine components
Desalination systems
Condenser tubes
Offshore equipment
C36000 Applications:
CNC precision parts
Valves & fittings
Electrical connectors
Automotive components
Which One Should You Choose?
Choose C36000 if:
You need:
High-speed CNC machining
Complex precision parts
Low production cost
Ideal for:
Fittings, connectors, fasteners
Choose C46700 if:
You need:
Seawater corrosion resistance
High strength under harsh conditions
Ideal for:
Marine / offshore systems
Heat exchangers
Expert Insight
In real engineering projects:
C36000 dominates manufacturing industries due to unmatched machinability and cost efficiency
C46700 dominates marine engineering, where failure is driven by corrosion + erosion, not machining cost
👉 This reflects a key material selection principle:
"C36000 is chosen by manufacturers, C46700 is chosen by engineers."
FAQ
1. What is the main difference between C46700 and C36000 brass?
The key difference is their purpose and alloying elements:
C46700 → Cu-Zn-Al (marine-grade, corrosion-resistant)
C36000 → Cu-Zn-Pb (free-cutting, high machinability)
👉 C46700 focuses on performance in harsh environments, while C36000 focuses on machining efficiency.
2. Which alloy is stronger, C46700 or C36000?
C46700 is stronger and harder.
It is designed for:
High-load applications
Marine and offshore environments
👉 C36000 has moderate strength, suitable for precision parts but not heavy-duty use.
3. Which brass has better corrosion resistance?
C46700 has significantly better corrosion resistance, especially in:
Seawater
Salt spray environments
High-humidity industrial conditions
👉 C36000 is not suitable for marine environments.
4. Why is C36000 called free-cutting brass?
Because it contains lead (~3%), which:
Acts as a lubricant
Breaks chips during machining
👉 Result:
C36000 has the highest machinability of any brass alloy (100% rating).
5. Is C46700 difficult to machine?
Yes, compared to C36000.
No lead content
Higher hardness
👉 This leads to:
Increased tool wear
Lower machining speed
6. Can C36000 replace C46700 in marine applications?
No, not recommended.
C36000 may suffer from:
Dezincification
Rapid corrosion in seawater
👉 For marine or offshore use, C46700 is the correct choice.
7. Which alloy is better for CNC machining?
C36000 is the best choice for CNC machining due to:
Excellent chip control
High cutting speeds
Smooth surface finish
👉 It is widely used in mass production of precision parts.
8. Which material is more cost-effective?
C36000 → lower overall cost (material + machining)
C46700 → higher cost, but longer lifespan in harsh environments
👉 Selection depends on application, not just price.
9. What are typical applications of C36000 vs C46700?
C36000 Applications:
Precision turned parts
Valves and fittings
Electrical connectors
Automotive components
C46700 Applications:
Marine hardware
Heat exchangers
Condensers
Desalination systems
10. Which alloy should I choose?
Quick selection guide:
Choose C36000 👉 high-speed machining, precision components, cost-sensitive production
Choose C46700 👉 marine environments, corrosion resistance, long service life
