C27000 Brass

Grade Name

UNS Number: C27000

Common Names: Brass (65% Cu, 35% Zn), 65/35 Brass

Applicable Standards:

• ASTM B36/B36M (Brass Sheet/Strip)

• ASTM B134 (Brass Wire)

• SAE J463 (Wrought Copper Alloys)

• DIN 17660 (European Standard: 2.0360)

Product Features

• Superior Cold Formability: Ideal for deep drawing, bending, and complex forming operations.

• High Strength-Ductility Balance: >50% elongation in annealed state; strength significantly increases after cold working.

• Good Corrosion Resistance: Suitable for atmospheric, freshwater, and low-corrosion industrial environments.

• Excellent Machinability: Delivers high surface finish with minimal tool wear.

• Eco-Friendly & Cost-Effective: Lead content ≤0.07% (RoHS compliant); optimized zinc content reduces material costs.

• Decorative Appeal: Bright yellow surface ideal for architectural and consumer product designs.

Common Product Forms & Dimensions

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 available (e.g., forged rounds, turned bars). Stock dimensions typically cover 6–300mm thickness.

C27000 Brass Composition (Chemical Composition)

Element	Cu	Zn	Pb	Fe	Other Impurities (Total)
wt%	64–68.5	Balance	≤0.07	≤0.05	≤0.15

*Complies with ASTM B36 and SAE J463. Low-lead design meets environmental regulations.*

Physical Properties

Property	Value Range
Density (g/cm³)	8.45–8.55
Melting Point (°C)	900–930
Electrical Conductivity (%IACS, Annealed)	25–28
Thermal Conductivity (W/m·K, 20°C)	105–120
Coefficient of Thermal Expansion (×10⁻⁶/K, ≤250°C)	20.2

Note: Hot working temp.: 820–870°C; Annealing temp.: 520–650°C.

Mechanical Properties

Condition	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HV)
Annealed	270–350	90–130	50–65	55–75
Cold Worked (H02)	400–500	320–380	20–30	100–130
Cold Worked (H04)	500–600	450–520	5–10	150–180

Data based on 1mm thickness. Actual values vary with dimensions and processing.

Core Advantages

1. Exceptional Cold Formability: >95% success rate in deep drawing (e.g., cartridge cases, precision stampings).

2. High Cost Efficiency: 35% zinc content reduces raw material costs for high-volume production.

3. Surface Treatment Adaptability: Compatible with plating, polishing, and painting for functional/decorative uses.

4. Environmental Resistance: Resists oxidation in humid conditions and corrosion in freshwater.

Product Applications

• Architectural Decor: Door handles, light fixtures, trim.

• Electronics: Connectors, terminals, EMI shielding.

• Automotive: Radiator cores, fuel system components.

• Plumbing: Low-pressure valve bodies, fittings.

• Industrial: Fasteners, springs, stamped hardware.

Processing Guidelines

• Hot Working: Control temp. at 820–870°C; avoid edge cracking (hot extrusion recommended).

• Cold Working: Anneal (600–700°C) to restore ductility; use lubricants to prevent galling.

• Welding: Compatible with TIG/resistance welding. Apply low-temp stress relief (260–270°C); limit heat input to prevent zinc vaporization.

• Surface Treatment: Acid clean before plating; apply clear coat for decorative parts.

Key Application Scenarios

• Architectural Restoration: Vintage hardware for hotels/historical buildings.

• Electronics Manufacturing: Stamped terminals for mobile devices/PCs.

• Automotive Thermal Systems: Radiator cores in EVs.

• Plumbing Hardware: Valves and bathroom accessories.

FAQs

Q1: How does brass C27000 differ from C26000 (70/30 Brass)?

A: C27000 has lower copper content (65% vs. 70%) than C26000, reducing costs by ~15% but with slightly lower strength/conductivity. Ideal for decorative & medium-load parts.

Q2: Is it suitable for marine environments?

A: Only for freshwater/low-salinity applications. Requires protective coatings (e.g., nickel) for saltwater; prolonged exposure risks dezincification corrosion.

Q3: Does it comply with environmental regulations?

A: Lead content ≤0.07% meets RoHS. SGS reports available. Fully recyclable.

Standard References

Standard	Description
ASTM B36/B36M	Brass Sheet/Strip & Rolled Bar Specifications
ASTM B134	Brass Wire Standard
SAE J463	Mechanical Property Standards for Wrought Copper Alloys
DIN 17660	European Standard for Wrought Copper Alloys (Designation: 2.0360)