CuZn33 Copper

Alloy Designation

CuZn33, also known as 33 Brass, is a common copper-zinc alloy with a zinc content of approximately 33%.

Product Characteristics

Good Mechanical Properties: Combines strength and ductility, making it easy to process and form.
Excellent Corrosion Resistance: Demonstrates good corrosion resistance in most environments, particularly suitable for freshwater, seawater, and atmospheric conditions.
Good Electrical and Thermal Conductivity: Electrical conductivity is about 28% of pure copper, and thermal conductivity is about 50% of pure copper.
Good Weldability and Plating Properties: Easy to weld and plate, meeting various application requirements.
Attractive Golden Color: Exhibits a golden-yellow surface, providing good decorative appeal.

Common Product Forms and Specifications

Product Form	Specifications
Plate	Thickness: 0.1mm - 100mm; Width: 100mm - 3000mm; Length: 1000mm - 6000mm
Strip	Thickness: 0.05mm - 3mm; Width: 10mm - 600mm
Rod	Diameter: 1mm - 300mm; Length: 1000mm - 6000mm
Wire	Diameter: 0.1mm - 10mm
Tube	Outer Diameter: 3mm - 200mm; Wall Thickness: 0.2mm - 10mm; Length: 1000mm - 6000mm

Chemical Composition

Element	Cu	Zn	Pb	Fe	Ni	Others
Content (%)	63.0 - 68.0	Balance	≤ 0.1	≤ 0.05	≤ 0.5	≤ 0.5

Physical Properties

Property	Value
Density (g/cm³)	8.44
Melting Point (°C)	905 - 910
Thermal Conductivity (W/m·K)	120
Electrical Conductivity (%IACS)	28
Coefficient of Thermal Expansion (10⁻⁶/K)	20.2

Mechanical Properties

Condition	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HB)
Soft	≥ 290	≥ 100	≥ 40	≤ 100
Half-Hard	≥ 340	≥ 200	≥ 20	100 - 150
Hard	≥ 440	≥ 350	≥ 10	≥ 150

Core Advantages

Cost-Effective: Compared to other copper alloys, CuZn33 has a lower cost.
Excellent Processability: Easy to perform cold and hot working, allowing for the production of various shapes and sizes.
Wide Range of Applications: Suitable for multiple industrial fields and everyday use.

Product Applications

Construction Industry: Roofing, curtain walls, decorative strips, hardware, etc.
Electronics and Electrical Industry: Connectors, terminals, switches, relays, etc.
Machinery Manufacturing Industry: Gears, bearings, valves, pump bodies, etc.
Transportation Industry: Automotive components, ship fittings, etc.
Daily Hardware: Locks, handles, faucets, tableware, etc.

Processing Precautions

Intermediate annealing is required during cold working to eliminate work hardening and improve processability.
Hot working temperature should be controlled between 700 - 850°C to avoid overheating and coarse grain formation.
Appropriate welding materials and processes should be selected to avoid welding cracks.

Main Application Scenarios

Situations requiring good corrosion resistance and mechanical properties.
Situations requiring good electrical and thermal conductivity.
Situations requiring aesthetic and decorative appeal.

Frequently Asked Questions

Q: What is the difference between CuZn33 and H62?

A: CuZn33 has a zinc content of about 33%, while H62 has a zinc content of about 38%. CuZn33 has slightly lower strength and hardness than H62 but better ductility and corrosion resistance.

Q: Can CuZn33 be used for food contact?

A: CuZn33 itself does not contain harmful elements such as lead, but attention should be paid to impurities that may be introduced during processing. It is recommended to choose CuZn33 products that comply with food-grade standards.

Standard Reference

GB/T 5231-2012 Wrought Copper and Copper Alloy Designations and Chemical Composition
GB/T 2040-2017 Copper and Copper Alloy Plates
GB/T 2059-2017 Copper and Copper Alloy Strips
GB/T 4423-2017 Copper and Copper Alloy Rods
GB/T 14954-2017 Copper and Copper Alloy Wires
GB/T 1527-2017 Copper and Copper Alloy Tubes