CuZn30 Deco
BRASS

Cu69-71 Zn reste Pb 0.0035 max

Chemical composition

Cu69-71

Ni0.015 max

ZnBAL

Pb0.0035 max

Sn0.015 max

Fe0.015 max

S0.0012 max

Alloy name
RLSA no.	331
EN standard	EN‎CW505L‎
DIN standard
UNS no.*	C26000

*Unified Numbering System (USA)

Characteristics and main uses

Special CuZn30 alloy, well suited for decorative parts with high surface requirements, especially after electroplating with Gold, Palladium and Rhodium. The alloy is suitable for diamontage and therefore dedicated for the watch industry, especially hands, dials and other decorative parts.

CuZn30 is a solid solution strengthened copper alloy containing 30% zinc (brass). The alloy has very good cold forming properties.

Main uses

Decorative parts for watch industry, jewelry

Physical properties		Units
Density (20°C)	8.53	Kg/dm³
Melting point	954	°C
Longitudinal elasticity modulus	110	GPa
Thermal conductivity		W/m·K
Electrical conductivity	16	m/Ω·mm²
Electrical resistivity	<0.0784	µΩ·m
Linear expansion Coefficient	19.7	10⁻⁶·K⁻¹
IACS (International Annealed Copper Standard)	>28	%
Poisson's ratio

Capabilities
Corrosion resistance	3
Hot deformation	4
Cold deformation	4
Electrodepositing
Diamond cutting	4
Nitriding
Mechanical polishing	4
Welding without filler
Brazing

1 poor | 2 average | 3 good | 4 very good | - no info

Heat Treatment / Hardening
Annealing temperature	450-650	°C
Temperature for stress relief treatment	190-290	°C
Hardening temperature		°C
Hardening treatment time		hour(s)

Alloy mechanical properties

CuZn30 Deco
Possible hardness range	55-200	HV
Possible Rm range	270-630	MPa

Non-exhaustive list of grades

Grade	Hardness (HV: Vickers) min - max	Rm (MPa) min - max	Rp 0.2 (MPa) min - max	Elongation (%) where L0 = 100mm min - max
R270	55-90	270-350	≤‎160	≥‎40
R350	95-125	350-430	≥‎170	≥‎21
R410	120-155	410-490	≥‎260	≥‎9
R480	150-180	480-560	≥‎430	≥‎4
R550	170-200	550-640	≥‎530	≥‎2
R630	≥190	≥‎630	≥‎610	-

Do not hesitate to ask us for your specific grades and parameters. We can make productions according to your needs.

Engineered metals
for precision industries

Data sheet - CuZn30 Deco

CuZn30 Deco
BRASS

Cu69-71 Zn reste Pb 0.0035 max

Characteristics and main uses

Main uses

Alloy mechanical properties

Non-exhaustive list of grades

Contact us

Engineered metals for precision industries

Data sheet - CuZn30 Deco

CuZn30 DecoBRASS

Cu69-71 Zn reste Pb 0.0035 max

Characteristics and main uses

Main uses

Alloy mechanical properties

Non-exhaustive list of grades

Contact us

Engineered metals
for precision industries

CuZn30 Deco
BRASS