BZn12-24 Copper

Designation and Standards

Standard Designation: BZn12-24 (Zinc White Copper)
Applicable Standard: GB/T 5231-2012 (Wrought Copper and Copper Alloys)
International Equivalent Grades: American Standard C75700, Japanese Standard C7451
Material Category: Copper-Nickel-Zinc Ternary Alloy (Cu-Ni-Zn), containing 63.0%-66.0% Copper, 11.0%-13.0% Nickel + Cobalt, with the remainder being Zinc.

Chemical Composition

Element	Cu	Ni+Co	Zn	Fe	Mn	Total Impurities
Content（%）	63.0-66.0	11.0-13.0	Remainder (approximately 21%-26%)	≤0.3	≤0.5	≤0.8

Physical Properties

Property Parameter	Value	Remarks
Density	8.69 g/cm³	High density, suitable for precision components
Electrical Conductivity	≥7% IACS	Suitable for general electrical conductivity requirements
Thermal Conductivity	40 W/(m·K)	Moderate heat dissipation capability
Linear Expansion Coefficient	16.2×10⁻⁶/℃（20-300℃）	Excellent thermal stability
Elastic Modulus	125 GPa	Material rigidity index

Mechanical Properties

Property Parameter	Soft State (M)	Hard State (H04)
Tensile Strength (σb)	≥325 MPa	550-640 MPa
Elongation (δ10)	≥25%	≥2%
Vickers Hardness (HV)	≤110	170-200
Elastic Limit	—	≥450 MPa

Core Advantages

Outstanding Corrosion Resistance: Low corrosion rate (≤0.01 mm/a) in humid, seawater, and weak acid environments.
Excellent Machinability: Excellent cold working performance, supports processes such as stamping, stretching, and electroplating, with a high surface finish.
Comprehensive Mechanical Properties: Combines high strength with moderate plasticity, suitable for precision component manufacturing.

Application Fields

Electronics Industry: Shielding covers, resonator housings (high-precision electromagnetic shielding requirements).
Precision Machinery: Camera parts, optical templates, rivets, screws (high wear resistance and dimensional stability requirements).
Daily Necessities: Tableware, eyeglass frames, nameplates (balance of aesthetics and corrosion resistance).
Automotive and Marine: Corrosion-resistant valves, instrument parts (requiring protective coatings for use).

Processing Precautions

Annealing Process: After cold working, anneal at 600-750℃ to eliminate internal stresses and prevent cracking.
Machining: It is recommended to use carbide tools, with a cutting speed of ≤60 m/min. The coolant should contain extreme pressure additives.
Welding Process: Preferably use argon arc welding or laser welding to avoid porosity caused by zinc and nickel evaporation.
Environmental Compliance: Low lead content (≤0.03%), but waste materials should still be processed according to environmental regulations.

Standard References

Chemical Composition and Processing Specifications: GB/T 5231-2012, ASTM B36 (American Standard for Plates).
Mechanical Property Testing: GB/T 228.1 (Tensile Test).

Note: The above data is compiled from various industrial standards and technical documents. Actual performance may vary slightly due to production processes, and the specific results should be based on the supplier's test report.

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