EN 12163 Grade CuZn28 R370 – High-Performance Unhardenable Copper Alloy

CuZn28 (CW504L) is an unhardenable wrought alloy. High hardness and strength parameter are achievable by cold forming only. Thermal and electrical conductivity are lower than for CuZn20. Corrosion resistance is similar to pure copper. Processing properties: warm forming: good cold forming: very good machinability: moderately hard and soft soldering: very good TIG-welding: good burnishing: good CuZn28 is used for deep drawing components and all types of sleeves, for automotive cooler, musical instruments, springing elements and clockfaces and as cladding material for ingot steel.

Properties

General

Property	Temperature	Value
Density	20.0 °C	8.55 - 8.6 g/cm³

Mechanical

Property	Temperature	Value
Elastic modulus	20.0 °C	114 GPa
Elongation	20.0 °C	10 %
Elongation A10	20.0 °C	8 %
Elongation A100	20.0 °C	6 %
Shear modulus	20.0 °C	40 GPa
Tensile strength	20.0 °C	370 MPa
Yield strength Rp0.2	20.0 °C	320 MPa

Thermal

Property	Temperature	Value	Comment
Coefficient of thermal expansion	23.0 °C	1.7E-5 - 2.1E-5 1/K	Typical for Wrought Copper Brass
Melting point		875 - 1075 °C	Typical for Wrought Copper Brass
Specific heat capacity	20.0 °C	377 J/(kg·K)
Thermal conductivity	20.0 °C	130 W/(m·K)

Electrical

Property	Temperature	Value
Electrical conductivity	20.0 °C	1.65E+7 S/m
Electrical resistivity	20.0 °C	6.1E-8 Ω·m

Chemical properties

Property	Value
Aluminium	0.02 %
Copper	71 - 73 %
Iron	0.05 %
Lead	0.05 %
Nickel	0.3 %
Tin	0.1 %

EN 12163 Grade CuZn28 (R310) – Premium High‑Strength Copper Alloy EN 12163 CuZn31Si1 R460 – Unhardenable Copper Alloy for Friction Components

Metal