Brass C72650

Brass C72650 is a high-strength copper-zinc alloy with excellent corrosion resistance, particularly in seawater, making it ideal for marine and other harsh environment applications. It is well-suited for CNC machining applications requiring both durability and resistance to corrosion.

Introduction to Brass C72650

Brass C72650, also known as Leaded Naval Brass, is a high-performance copper-zinc alloy that contains lead and tin, offering exceptional resistance to corrosion, particularly in seawater and marine environments. It is specifically formulated for applications exposed to harsh corrosive elements, making it ideal for marine and offshore applications. Compared to other brass alloys, Brass C72650 offers superior mechanical properties, including high strength and durability, while maintaining excellent machinability. For precision machining, Brass C72650 is a great choice due to its balance of machinability and resistance to environmental stress.

Brass C72650 is commonly used in CNC machined parts such as marine hardware, valves, fittings, and bushings. Its excellent resistance to seawater corrosion and mechanical stress makes it ideal for industries like marine, oil and gas, and heavy machinery, where both strength and durability are paramount.

Chemical, Physical, and Mechanical Properties of Brass C72650

Chemical Composition (Typical)

Element	Composition Range (wt.%)	Key Role
Copper (Cu)	58.0–62.0%	Provides strength, conductivity, and corrosion resistance
Zinc (Zn)	36.0–40.0%	Enhances strength and material hardness
Tin (Sn)	1.5–3.0%	Improves corrosion resistance, especially in seawater
Lead (Pb)	≤1.5%	Improves machinability and reduces friction during machining
Iron (Fe)	≤0.5%	Minimal impact on properties

Physical Properties

Property	Value (Typical)	Test Standard/Condition
Density	8.7 g/cm³	ASTM B311
Melting Point	900–950°C	ASTM E29
Thermal Conductivity	85 W/m·K at 20°C	ASTM E1952
Electrical Conductivity	10% 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	110 GPa	ASTM E111

Mechanical Properties (Annealed Temper)

Property	Value (Typical)	Test Standard
Tensile Strength	420–490 MPa	ASTM E8/E8M
Yield Strength (0.2%)	290–370 MPa	ASTM E8/E8M
Elongation	20–30%	ASTM E8/E8M
Hardness	70–90 HB	ASTM E10
Fatigue Strength	~200 MPa	ASTM E466
Impact Resistance	Good	ASTM E23

Key Characteristics of Brass C72650

Excellent Corrosion Resistance

Brass C72650 provides outstanding resistance to corrosion, particularly in seawater, making it ideal for marine environments and offshore applications.

Good Strength and Durability

This alloy has excellent strength and durability, making it suitable for applications exposed to mechanical stress, including valves, bushings, and hardware.

Good Machinability

Brass C72650 is easy to machine due to the addition of lead, which provides lubrication during the cutting process. This allows for high-speed CNC machining with minimal tool wear.

High Wear Resistance

With its high-strength properties and corrosion resistance, Brass C72650 is particularly resistant to wear, making it ideal for applications where components are in constant motion or subject to friction.

Aesthetic Appeal

Brass C72650 has a bright, gold-like appearance, which gives it an attractive visual appeal. This aesthetic and its excellent corrosion resistance make it a popular choice for decorative and functional marine hardware.

CNC Machining Challenges and Solutions for Brass C72650

Machining Challenges

Chip Formation Brass C72650 can produce short chips during machining, which could potentially cause blockages and reduce productivity if not properly managed.
Solution: Use chip breakers to control chip formation and apply adequate coolant or air to clear chips efficiently.
Tool Wear Although Brass C72650 offers good machinability, the alloy's hardness can cause tool wear, especially in high-speed cutting operations.
Solution: Use carbide or ceramic tools to reduce wear and extend tool life during machining.
Surface Finish Quality Brass C72650 may form burrs during machining, which can affect the surface finish of parts.
Solution: Employ sharp tools, high-speed cutting techniques, and proper lubrication to ensure smoother finishes.
Work Hardening Brass C72650 can experience work hardening if excessive pressure or cutting speeds are used.
Solution: Use moderate cutting speeds, sharp tools, and apply coolant to prevent work hardening and preserve material quality.

Optimized Machining Strategies

Parameter	Recommendation	Rationale
Tool Material	Carbide or ceramic tools	These materials provide superior wear resistance and extended tool life.
Geometry	Positive rake, sharp edges	Improves chip flow and results in 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 minimizes burr formation.
Coolant	Flood coolant or air blast	Reduces heat and enhances surface finish.

Brass C72650 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 Brass C72650

Machining Process	Function and Benefit for Brass C72650
CNC Machining	Ideal for high-speed, precision machining of components like marine connectors, bushings, and valves.
CNC Milling	Suitable for creating slots, grooves, and complex shapes in components such as fittings and valves.
CNC Turning	Used for turning cylindrical parts such as bushings, gears, and mechanical components in industrial and marine applications.
CNC Drilling	Ideal for creating precise holes for fasteners and mechanical parts in marine and offshore environments.
CNC Boring	Ensures precision internal machining for parts such as bearings and bushings, used in marine systems.
CNC Grinding	Provides smooth finishes for parts exposed to wear and tear, such as gears and shafts in marine applications.
Multi-Axis Machining	Ideal for producing complex, multi-featured parts for marine, oil, and gas industries.
Precision Machining	Provides ultra-tight tolerances for high-performance components for industries like aerospace and medical devices.
EDM Machining	Used for creating intricate features and fine details in marine and offshore components.

Surface Treatment for Brass C72650 CNC Parts

Electroplating: Enhances corrosion resistance and provides a shiny finish for marine connectors and other components.
Polishing: Achieves a high-gloss finish for decorative parts and improves their functionality.
Brushing: Creates a satin or matte finish for components exposed to frequent handling in marine and industrial environments.
PVD Coating: Adds a durable coating that increases wear resistance and extends the life of marine components.
Passivation: Improves corrosion resistance, especially for components 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 Brass C72650

Aerospace Industry: Used for manufacturing high-strength components such as connectors and fittings subjected to high stresses.
Electrical & Power: Ideal for electrical components requiring high conductivity and durability.
Automotive Industry: Commonly used in automotive applications such as connectors, bushings, and fittings.
Marine Industry: Highly suitable for marine hardware and components exposed to seawater and other corrosive elements.