C67200 Copper-Nickel-Tin Bronze
Introduction to C67200 Copper-Nickel-Tin Bronze
C67200 Copper-Nickel-Tin Bronze is a highly durable copper-based alloy that combines copper, nickel, and tin. This alloy is specifically designed to offer excellent resistance to corrosion, especially in marine environments where exposure to seawater is a concern. Compared to other bronze alloys, C67200 is known for its superior mechanical properties, including high strength, wear resistance, and resistance to erosion and corrosion. For precision machining, C67200 Copper-Nickel-Tin Bronze is a reliable material choice, offering high machinability for intricate components with tight tolerances.
C67200 Copper-Nickel-Tin Bronze is often used in CNC machined parts for marine, aerospace, and energy industries. Its corrosion resistance, especially in seawater, and mechanical strength make it ideal for critical applications, including marine hardware, valves, heat exchangers, and industrial components exposed to harsh conditions.
Chemical, Physical, and Mechanical Properties of C67200 Copper-Nickel-Tin Bronze
Chemical Composition (Typical)
Element | Composition Range (wt.%) | Key Role |
|---|---|---|
Copper (Cu) | 85.0–90.0% | Provides strength, conductivity, and corrosion resistance |
Nickel (Ni) | 5.0–10.0% | Enhances strength, improves corrosion resistance in seawater |
Tin (Sn) | 1.0–3.0% | Improves wear resistance and increases strength at high temperatures |
Iron (Fe) | ≤0.5% | Adds strength and wear resistance |
Zinc (Zn) | ≤0.5% | Enhances hardness and overall strength |
Physical Properties
Property | Value (Typical) | Test Standard/Condition |
|---|---|---|
Density | 8.7 g/cm³ | ASTM B311 |
Melting Point | 900–940°C | ASTM E29 |
Thermal Conductivity | 120 W/m·K at 20°C | ASTM E1952 |
Electrical Conductivity | 15% IACS at 20°C | ASTM B193 |
Coefficient of Expansion | 19 µm/m·°C | ASTM E228 |
Specific Heat Capacity | 380 J/kg·K | ASTM E1269 |
Elastic Modulus | 105 GPa | ASTM E111 |
Mechanical Properties (Annealed Temper)
Property | Value (Typical) | Test Standard |
|---|---|---|
Tensile Strength | 550–700 MPa | ASTM E8/E8M |
Yield Strength (0.2%) | 300–450 MPa | ASTM E8/E8M |
Elongation | 18–25% | ASTM E8/E8M |
Hardness | 80–100 HB | ASTM E10 |
Fatigue Strength | ~250 MPa | ASTM E466 |
Impact Resistance | Good | ASTM E23 |
Key Characteristics of C67200 Copper-Nickel-Tin Bronze
Outstanding Corrosion Resistance
C67200 Copper-Nickel-Tin Bronze is specifically designed for environments where corrosion resistance is a top priority. The combination of nickel and tin improves the alloy’s resistance to seawater and other aggressive environments, making it ideal for marine applications such as seawater pumps, valves, and propellers.
High Strength and Durability
This alloy offers exceptional strength and durability, ensuring it can withstand heavy loads and resist deformation under stress. Its high tensile strength and fatigue resistance make it ideal for industrial applications that require materials to maintain integrity under continuous stress.
Excellent Wear Resistance
C67200 Copper-Nickel-Tin Bronze exhibits excellent wear resistance, particularly when used in mechanical parts that undergo constant movement and friction, such as bushings, bearings, and seals. This ensures that components made from this material have a long service life, reducing maintenance needs and downtime.
Good Machinability
Despite its strength and durability, C67200 Copper-Nickel-Tin Bronze offers good machinability, allowing it to be shaped and machined into complex components without excessive tool wear. This makes it a suitable choice for intricate CNC machining operations that demand high precision.
Non-Galling and Non-Seizing
This alloy also has the important property of being non-galling, meaning it resists seizing or sticking to mating surfaces. This is particularly beneficial in applications involving moving parts, ensuring smooth operation without premature wear or failure.
CNC Machining Challenges and Solutions for C67200 Copper-Nickel-Tin Bronze
Machining Challenges
Chip Formation Like many high-strength alloys, C67200 Copper-Nickel-Tin Bronze can produce long chips during machining, which may interfere with the process.
Solution: Use chip breakers to break the long chips into smaller pieces, and optimize the feed rates and cutting speeds. Additionally, air or coolant can help clear chips effectively.
Tool Wear The alloy’s hardness can cause accelerated tool wear, particularly during high-speed machining operations.
Solution: Use carbide or ceramic cutting tools designed for high-performance machining to enhance tool life and minimize wear.
Surface Finish Achieving a fine surface finish can be challenging due to the material’s tendency to produce rough edges during cutting.
Solution: Ensure the use of sharp, high-quality tools, and apply adequate lubrication to reduce friction and improve the surface quality. Moderate cutting speeds also help reduce roughness.
Work Hardening C67200 Copper-Nickel-Tin Bronze is susceptible to work hardening if machining parameters are not carefully controlled.
Solution: Apply moderate cutting speeds, ensure sharp tools, and use proper coolant techniques to minimize heat generation and avoid work hardening.
Optimized Machining Strategies
Parameter | Recommendation | Rationale |
|---|---|---|
Tool Material | Carbide or ceramic tools | Carbide and ceramic tools provide better wear resistance and are suitable for high-speed machining. |
Geometry | Positive rake, sharp edges | Improves chip flow and ensures smoother surface finishes. |
Cutting Speed | 150–250 m/min | Reduces heat generation and prevents material deformation. |
Feed Rate | 0.10–0.20 mm/rev | Ensures smooth cutting and reduces burr formation. |
Coolant | Flood coolant or air blast | Reduces heat buildup and enhances surface finish. |
C67200 Cutting Parameters (ISO 513 Compliance)
Operation | Speed (m/min) | Feed (mm/rev) | Depth of Cut (mm) | Coolant Pressure (bar) |
|---|---|---|---|---|
Roughing | 150–200 | 0.15–0.20 | 2.0–3.5 | 25–35 |
Finishing | 200–250 | 0.05–0.10 | 0.5–1.0 | 30–50 |
Typical Machining Methods for C67200 Copper-Nickel-Tin Bronze
Machining Process | Function and Benefit for C67200 Copper-Nickel-Tin Bronze |
|---|---|
Ideal for high-speed, precision machining of components like bushings, bearings, and gears. | |
Suitable for creating slots, grooves, and complex shapes in components like gears and bushings. | |
Used for turning cylindrical parts such as valves, bushings, and mechanical components. | |
Ideal for creating precise holes for fasteners and other components. | |
Ensures precision internal machining for components like bearings and bushings. | |
Provides smooth finishes for parts exposed to wear and tear, such as shafts and gears. | |
Ideal for producing complex, multi-featured parts in aerospace, automotive, and industrial sectors. | |
Provides ultra-tight tolerances for high-performance components used in aerospace and medical devices. | |
Used for creating intricate features and fine details in parts such as electrical connectors and gears. |
Surface Treatment for C67200 Copper-Nickel-Tin Bronze CNC Parts
Electroplating: Enhances corrosion resistance and provides a shiny finish for parts such as connectors and valves.
Polishing: Achieves a high-gloss finish for decorative parts and improves their functionality.
Brushing: Creates satin or matte finishes for parts exposed to frequent handling, such as mechanical components.
PVD Coating: Adds a durable coating that increases wear resistance and extends the life of mechanical components.
Passivation: Improves corrosion resistance, especially for parts exposed to aggressive chemicals.
Powder Coating: Provides a thick, protective finish ideal for parts exposed to UV light and harsh conditions.
Teflon Coating: Adds non-stick and chemical-resistant properties, ideal for mechanical applications.
Chrome Plating: Provides a glossy, durable coating that resists corrosion and enhances the appearance of components.
Industry Applications of C67200 Copper-Nickel-Tin Bronze
Aerospace Industry: Used for manufacturing high-performance components such as bushings, bearings, and connectors.
Electrical & Power: Ideal for electrical components requiring high conductivity and durability, including connectors and terminals.
Marine Industry: Suitable for marine hardware and components exposed to seawater and other corrosive elements.
Automotive Industry: Commonly used for automotive parts that need excellent wear resistance and mechanical strength.
FAQs
What are the key benefits of using C67200 Copper-Nickel-Tin Bronze for CNC machining?
How does C67200 Copper-Nickel-Tin Bronze perform in harsh marine environments?
Can C67200 Copper-Nickel-Tin Bronze be used for high-precision components?
What industries most commonly use C67200 Copper-Nickel-Tin Bronze for CNC machining?
How does the machinability of C67200 Copper-Nickel-Tin Bronze compare to other copper alloys?
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