CuZn30 Brass

Grade Designation & Standards

Standard Grade: CuZn30 (70/30 Brass)
International Equivalents:

• UNS (USA): C26000

• EN (Europe): CW505L

• JIS (Japan): C2600

Applicable Standards:

• ASTM B36 (Standard for Brass Plate, Sheet, Strip, and Rolled Bar)

• EN 12164 (Copper and Copper Alloys – Rod for General Purposes)

• JIS H3250 (Copper and Copper Alloy Rods and Bars)

Key Features

1. Excellent Cold Workability: Ideal for deep drawing, stamping, and forming.

2. Good Corrosion Resistance: Resists atmospheric and freshwater corrosion.

3. High Electrical & Thermal Conductivity: ~28% IACS electrical conductivity, suitable for electrical components.

4. Aesthetic Appeal: Polishes to a golden-yellow finish, widely used in decorative applications.

5. Cost-Effective: Balances performance and affordability.

Common Product Forms & Specifications

Product Form	Size Range	Delivery Condition
Rod	Diameter: 5–150 mm; Length: 1–6 m	Soft (O), Hard (H)
Sheet/Strip	Thickness: 0.2–10 mm; Width: ≤1200 mm	Annealed, Cold-rolled
Wire	Diameter: 0.1–12 mm	Coiled, Straight
Tube	OD: 3–150 mm; Wall Thickness: 0.5–10 mm	Soft, Half-hard
Custom Profiles	As per technical drawings	Tailored processing states

CuZn30 Chemical Composition

Element	Cu	Zn	Pb	Fe	Impurities
Content (%)	68.5–71.5	Balance	≤0.07	≤0.05	≤0.3

CuZn30 Data Sheet

Physical Properties

Property	Value	Remarks
Density	8.53 g/cm³	Lightweight for structural applications
Melting Point	915–955°C	Suitable for brazing and soldering
Electrical Conductivity	~28% IACS	Comparable to low-carbon steel
Thermal Conductivity	120–130 W/(m·K)	Efficient heat dissipation
Thermal Expansion Coefficient	20.5×10⁻⁶/°C (20–300°C)	Stable dimensional performance

Mechanical Properties

Property	Soft (O)	Hard (H)
Tensile Strength (Rm)	300–400 MPa	500–600 MPa
Yield Strength (Rp0.2)	100–150 MPa	450–550 MPa
Elongation (A50)	≥55%	≥10%
Hardness (HV)	60–100	120–180

Core Advantages

1. Superior Formability: Easily fabricated into complex shapes without cracking.

2. Decorative Versatility: Maintains luster and resists tarnishing.

3. Wide Industry Compatibility: Meets requirements for electrical, architectural, and plumbing systems.

Product Applications

• Electronics: Terminals, connectors, fuse components.

• Architecture: Decorative trims, door handles, hinges.

• Plumbing: Valve bodies, fittings, pump components.

• Automotive: Radiator cores, fuel system parts.

• Consumer Goods: Jewelry, musical instruments, zippers.

Processing Guidelines

1. Annealing: Anneal at 450–600°C (soft state) to relieve stress after cold working.

2. Welding: Use TIG or resistance welding; avoid oxyacetylene welding to prevent zinc vaporization.

3. Machining: Optimal cutting speed: 80–120 m/min; use sharp tools with coolant.

4. Surface Treatment: Polish or apply clear lacquer to enhance corrosion resistance.

Key Application Scenarios

• Decorative Hardware: Luxury fixtures, architectural accents.

• Electrical Contacts: Low-voltage switchgear, relay components.

• Plumbing Systems: Corrosion-resistant fittings for water supply.

• Automotive Radiators: High thermal conductivity for cooling efficiency.

FAQs

Q1: What distinguishes CuZn30 from CuZn37 (Muntz Metal)?

A1: CuZn30 (70/30 brass) offers better cold workability, while CuZn37 (60/40 brass) has higher strength and hot workability.

Q2: Can CuZn30 be used in seawater environments?

A2: Limited suitability; prolonged exposure requires protective coatings (e.g., nickel plating).

Q3: How to prevent cracking during deep drawing?

A3: Ensure proper lubrication, control drawing speed, and anneal between stages.

Standard References

• Chemical Composition: ASTM B36, EN 12164, JIS H3250.

• Mechanical Testing: ISO 2626 (Brass rod mechanical properties).

• Processing: ASTM B134 (Standard for Brass Wire).

Note: Data sourced from international standards and industry specifications. Actual performance may vary slightly depending on manufacturing processes. For precise parameters, refer to supplier certifications.