C27000 – Yellow Brass (65% Cu, 35% Zn)
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C27000 – Yellow Brass (65% Cu, 35% Zn) Brochure
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Descriptions
C27000 Yellow Brass, also known as 65–35 Brass, is a copper–zinc alloy containing approximately 65% copper and 35% zinc. It is recognized for its bright golden-yellow color, high strength, and excellent cold-forming characteristics.
Compared to lower-zinc brasses, C27000 provides greater hardness, wear resistance, and moderate machinability while still maintaining good ductility. Its ability to combine both aesthetic appeal and structural performance makes it one of the most popular brasses used in decorative, architectural, and mechanical applications.
C27000 is widely employed in architectural fittings, decorative hardware, tubing, and components where both appearance and durability are essential. It offers a clean surface finish suitable for polishing, plating, or coating, making it a preferred material for high-end design and engineering projects alike.
Chemical Composition
C27000 Yellow Brass is a copper–zinc alloy containing approximately 65% copper and 35% zinc. It provides a balance of strength, formability, and corrosion resistance, making it one of the most commonly used brasses for decorative and structural applications.
| Element | Composition (wt%) |
|---|---|
| Copper (Cu) | 63.0 – 68.5 |
| Zinc (Zn) | Remainder (~31.5 – 37.0) |
| Lead (Pb) | ≤ 0.07 – 0.10 |
| Iron (Fe) | ≤ 0.07 |
| Other Residuals (Total) | ≤ 0.2 – 0.3 |
Note: The balance of the alloy consists primarily of zinc with small trace elements. C27000 is equivalent to CuZn35 under ISO/EN standards and is commonly used where both formability and aesthetic appeal are important.
Mechanical, Physical & Fabrication Properties
C27000 Yellow Brass offers a strong combination of mechanical strength, ductility, and aesthetic appeal. It performs well in both cold- and hot-working operations and maintains excellent surface quality for decorative and functional components.
| Property | Typical Range / Description |
|---|---|
| Tensile Strength (Annealed) | ~300 – 330 MPa |
| Elongation (Annealed) | Up to ~60% in thin sheet and rod forms |
| Tensile Strength (Cold-Worked Tempers) | Typically 400 – 650 MPa, depending on temper and section size |
| Density | ≈ 8.47 g/cm³ |
| Melting Range | 900 – 932 °C (Solidus to Liquidus) |
| Thermal Conductivity | ~110 – 120 W/m·K |
| Electrical Conductivity | ~25 – 28% IACS (Annealed) |
| Coefficient of Thermal Expansion | ~20 – 20.5 × 10⁻⁶ /K (20–300 °C) |
| Workability |
Excellent cold formability – suitable for drawing, bending, and stamping. Hot forming: fair to good, typically at controlled temperatures. |
| Machinability | Moderate (~30% of free-cutting brass). Produces fine surface finish, especially in softer tempers. |
| Joining & Fabrication |
Excellent soldering and brazing characteristics. Some welding methods require specialized techniques or fluxes. |
Applications
C27000 Yellow Brass is widely used in applications that demand a combination of mechanical strength, wear resistance, and attractive appearance. Its golden-yellow color, coupled with good formability and surface finish, makes it suitable for both functional and decorative components across various industries.
- Architectural Hardware: Hinges, knobs, trim, railings, and handrails where durability and color aesthetics are important.
- Decorative Hardware: Furniture fittings, nameplates, handles, and interior design accents requiring polish and corrosion resistance.
- Tubing: Used extensively in HVAC, radiator, and heat exchanger applications for its excellent formability and thermal properties.
- Fasteners & Mechanical Components: Screws, bolts, and other hardware that benefit from the alloy’s hardness and abrasion resistance.
- Pump & Hydraulic Parts: Cylinders and casings where wear and pressure resistance are needed.
- Electrical Components: Connectors, terminals, and contact parts offering good conductivity and durability.
- Plumbing & Decorative Elements: Fixtures, fittings, and accessories requiring a polished finish and long-term corrosion protection.
Due to its hardness, formability, and resistance to wear when cold-worked, C27000 is an excellent choice for products exposed to abrasion, repeated mechanical handling, or outdoor conditions.
Standards & International Equivalents:
C27000 Yellow Brass is widely standardized across international specifications for sheets, strips, bars, wires, and tubes. It is commonly referenced in both commercial and industrial standards for architectural, mechanical, and electrical applications.
| Standard Organization | Designation / Specification | Description / Coverage |
|---|---|---|
| UNS | C27000 | Unified Numbering System designation for Yellow Brass (65–35 Brass) |
| EN / DIN | CW507L | European / German standard equivalent for C27000 |
| ISO | CuZn35 / CuZn36 | International designation under ISO for 65–35 Brass |
| BS | CZ107 | British Standard equivalent for 65–35 Brass |
| JIS | C2700 | Japanese Industrial Standard designation for Yellow Brass |
| ASTM / SAE |
ASTM B134 (Wire) ASTM B36/B36M (Sheet, Plate, Rolled Bar) ASTM B135 (Tube) SAE J461 / J463 |
Common ASTM and SAE specifications covering wrought brass products |
Common Names & International Identifiers
C27000 Yellow Brass is commonly known by various trade and international names. It is one of the most widely used brasses due to its rich golden-yellow color, strength, and excellent formability for both industrial and decorative applications.
- Trade Names: Yellow Brass, 65–35 Brass
- UNS / CDA: C27000 / CDA 270
- EN (European): CW507L
- ISO / DIN: CuZn35 (or CuZn36 in some European notations)
- ASTM: Type 9 (older designation)
- BS (British Standard): CZ107
Common Product Forms & Dimensions
C27000 Yellow Brass is manufactured and supplied in a wide range of standard and customized forms. It is available in sheet, strip, rod, wire, and tube configurations to meet diverse industrial, architectural, and decorative applications. Custom dimensions and tempers can be provided as per client specifications.
| Form | Thickness (mm) | Width (mm) | Length | Diameter / OD (mm) |
|---|---|---|---|---|
| Sheet / Strip | 0.01 – 6.0 | 2 – 600 | Custom | — |
| Rod / Bar | — | — | Custom | 3 – 350 |
| Wire | — | — | Custom | 0.15 – 12.0 |
| Tube | Wall: 1 – 12 | — | Custom | OD: 10 – 180 |
Note: Custom sizes such as forged rounds, turned bars, and heavy plates are available on request. Standard stock typically covers 6–300 mm in thickness for bars and plates.
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