Overview
C270 Brass, commonly known as 65/35 Yellow Brass, is a copper-zinc alloy containing approximately 65% copper and 35% zinc. It offers an excellent balance of strength, ductility, corrosion resistance, formability, and cost-effectiveness, making it one of the most versatile brass alloys for industrial and decorative applications.
Compared with C260 (70/30 Brass) and C268 (66/34 Brass), C270 provides slightly higher strength while maintaining excellent cold-working and forming characteristics.
C270 brass is widely used in:
- Electrical Connectors
- Decorative Hardware
- Architectural Components
- Stamped Parts
- Radiator Components
- Heat Exchanger Parts
- Lighting Fixtures
- Consumer Products
Its attractive golden appearance and excellent fabrication properties make C270 a popular choice across multiple industries.
Material Specification
| Property | Value |
|---|---|
| Material Designation | C270 Brass |
| UNS Number | C27000 |
| Common Name | 65/35 Yellow Brass |
| Standard | ASTM B36 / ASTM B134 |
| Material Family | Copper-Zinc Brass Alloy |
| Density | 8.47 g/cm³ |
| Magnetic Property | Non-Magnetic |
| Typical Supply Condition | Annealed, Half-Hard, Hard |
| Standard Forms | Sheet, Plate, Strip, Rod, Bar, Tube |
Chemical Composition
| Element | Content (%) |
|---|---|
| Copper (Cu) | 63.0–68.5 |
| Zinc (Zn) | Balance |
| Lead (Pb) | ≤0.07 |
| Iron (Fe) | ≤0.05 |
| Other Elements | ≤0.30 |
The 65/35 composition provides a good balance between strength, ductility, and corrosion resistance.
Mechanical Properties
Annealed Condition
| Property | Value |
|---|---|
| Tensile Strength | 320–400 MPa |
| Yield Strength | 100–180 MPa |
| Elongation | 40–65% |
| Hardness | 65–90 HB |
| Elastic Modulus | 105 GPa |
Cold Worked Condition
| Property | Value |
|---|---|
| Tensile Strength | 500–700 MPa |
| Yield Strength | 350–600 MPa |
| Hardness | 130–190 HB |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.47 g/cm³ |
| Melting Point | 900–940°C |
| Thermal Conductivity | 115 W/m·K |
| Electrical Conductivity | 26–27% IACS |
| Electrical Resistivity | 0.065 μΩ·m |
| Thermal Expansion Coefficient | 20.8 × 10⁻⁶/K |
| Specific Heat Capacity | 380 J/kg·K |
Electrical Conductivity
| Material | Conductivity (% IACS) |
|---|---|
| C110 Copper | 100 |
| C260 Brass | 28 |
| C268 Brass | 27 |
| C270 Brass | 26–27 |
| Stainless Steel 304 | 2 |
C270 provides adequate conductivity for electrical connectors and hardware applications.
Thermal Conductivity
| Material | Thermal Conductivity (W/m·K) |
|---|---|
| C110 Copper | 390 |
| C260 Brass | 120 |
| C268 Brass | 116 |
| C270 Brass | 115 |
| Stainless Steel 304 | 16 |
Its thermal conductivity supports use in HVAC and heat-transfer applications.
Corrosion Resistance
| Environment | Performance |
|---|---|
| Indoor Environment | Excellent |
| Dry Atmosphere | Excellent |
| Fresh Water | Excellent |
| Marine Atmosphere | Good |
| Salt Water | Moderate |
| Industrial Environment | Good |
C270 offers good resistance to atmospheric corrosion and tarnishing.
Recommended surface treatments:
- Nickel Plating
- Chrome Plating
- Gold Plating
- Lacquer Coating
- Powder Coating
- Polishing
Weldability
| Welding Process | Rating |
|---|---|
| TIG Welding | Good |
| MIG Welding | Good |
| Resistance Welding | Excellent |
| Brazing | Outstanding |
| Soldering | Outstanding |
C270 is frequently fabricated using brazing and soldering processes.
Machinability
| Process | Rating |
|---|---|
| CNC Turning | Good |
| CNC Milling | Good |
| Drilling | Good |
| Grinding | Good |
| Stamping | Excellent |
| Deep Drawing | Excellent |
Machinability Comparison
| Material | Machinability |
|---|---|
| C360 Brass | Excellent |
| C270 Brass | Good |
| C268 Brass | Good |
| C260 Brass | Good |
| C110 Copper | Fair |
C270 is widely used in stamped and formed components.
Heat Treatment
Stress Relief Annealing
| Parameter | Value |
|---|---|
| Temperature | 250–350°C |
| Cooling Method | Air Cool |
Full Annealing
| Parameter | Value |
|---|---|
| Temperature | 450–650°C |
| Cooling Method | Air Cool |
Heat Treatability
| Property | Performance |
|---|---|
| Hardening by Heat Treatment | No |
| Cold Work Strengthening | Yes |
| Annealing Response | Excellent |
Like most brass alloys, C270 is strengthened through cold working rather than heat treatment.
International Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS (USA) | C27000 |
| ASTM | C270 |
| EN (Europe) | CuZn35 |
| DIN (Germany) | CW507L |
| JIS (Japan) | C2700 |
| ISO | CuZn35 |
| GB/T (China) | H65 Brass |
Available Forms
| Product Type | Availability |
|---|---|
| Sheet | Yes |
| Plate | Yes |
| Strip | Yes |
| Round Bar | Yes |
| Flat Bar | Yes |
| Tube | Yes |
| Wire | Yes |
Typical Applications
Electrical Industry
- Electrical Connectors
- Terminal Components
- Switch Hardware
- Conductive Parts
Architectural Industry
- Decorative Trim
- Door Hardware
- Nameplates
- Architectural Panels
Automotive Industry
- Radiator Components
- Decorative Trim
- Electrical Hardware
- HVAC Components
HVAC Industry
- Heat Exchanger Parts
- Condenser Components
- Cooling System Hardware
Consumer Products
- Lighting Fixtures
- Decorative Accessories
- Appliance Components
Industrial Manufacturing
- Precision Stampings
- Deep Drawn Components
- Fabricated Brass Parts
Manufacturing Characteristics
| Manufacturing Process | Rating |
|---|---|
| CNC Machining | Good |
| Stamping | Outstanding |
| Deep Drawing | Outstanding |
| Welding | Good |
| Brazing | Outstanding |
| Soldering | Outstanding |
| Electroplating | Excellent |
Advantages
Excellent Formability
Suitable for deep drawing, bending, and stamping.
Good Strength
Higher strength than C260 brass.
Attractive Appearance
Bright yellow-gold finish ideal for decorative uses.
Good Corrosion Resistance
Suitable for indoor and outdoor environments.
Excellent Fabrication Properties
Supports multiple manufacturing processes.
Cost Effective
Provides a balance between performance and affordability.
Limitations
Lower Conductivity Than Copper
Not recommended for high-current electrical systems.
Lower Corrosion Resistance Than Pure Copper
May require coatings in aggressive environments.
Moderate Wear Resistance
Not suitable for severe friction applications.
Potential Dezincification
Can occur in certain water and chemical environments.
Comparison with Other Brass Grades
| Property | C270 | C268 | C260 | C360 |
|---|---|---|---|---|
| Copper Content | 65% | 66% | 70% | 61.5% |
| Strength | Higher | High | Moderate | Moderate |
| Formability | Excellent | Excellent | Outstanding | Moderate |
| Machinability | Good | Good | Good | Excellent |
| Conductivity | 26–27% IACS | 27% IACS | 28% IACS | 26% IACS |
Comparison with Common Metals
| Material | Conductivity | Formability | Corrosion Resistance |
|---|---|---|---|
| C270 Brass | 26–27% IACS | Excellent | Excellent |
| C268 Brass | 27% IACS | Excellent | Excellent |
| C110 Copper | 100% IACS | Excellent | Excellent |
| Stainless Steel 304 | 2% IACS | Good | Outstanding |
Available Surface Finishes
Raw Finishes
- Mill Finish
- Annealed Finish
- Bright Finish
Functional Finishes
- Precision Machined Finish
- Brushed Finish
- Polished Finish
Decorative Finishes
- Nickel Plated
- Chrome Plated
- Gold Plated
- Lacquer Coated
Frequently Asked Questions (FAQ)
What is C270 brass?
C270 is a copper-zinc alloy containing approximately 65% copper and 35% zinc, commonly known as 65/35 Yellow Brass.
What is C270 brass used for?
Typical applications include:
- Electrical Connectors
- Decorative Hardware
- Architectural Components
- Heat Exchanger Parts
- Stamped Components
What is the equivalent material to C270?
Common equivalents include:
- CuZn35
- CW507L
- C2700
- H65 Brass
What is the difference between C270 and C268?
| Property | C270 | C268 |
|---|---|---|
| Copper Content | Slightly Lower | Slightly Higher |
| Strength | Slightly Higher | High |
| Conductivity | Slightly Lower | Slightly Higher |
Is C270 suitable for electrical applications?
Yes. It is commonly used for electrical connectors, terminals, and hardware components.
Can C270 be welded?
Yes. C270 offers good weldability and excellent brazing and soldering performance.
Is C270 corrosion resistant?
Yes. It performs well in atmospheric and industrial environments.
Why choose C270 brass?
Because it combines:
- Excellent Formability
- Good Strength
- Attractive Appearance
- Corrosion Resistance
- Competitive Cost
Is C270 suitable for decorative applications?
Yes. Its bright golden appearance makes it a popular decorative brass alloy.
Does GCNOV provide custom manufacturing services for C270 brass?
Yes. GCNOV provides:
- CNC Machining
- Precision Stamping
- Deep Drawing
- Brass Fabrication
- Surface Plating
- Prototype Development
- Low-Volume Production
- Mass Production