EN 12168 Grade CuZn40 H070 – High-Strength Copper Alloy for Precision Applications

CuZn40 (CW509L) is an unhardenable wrought alloy. High hardness and strength parameter are achievable by cold forming only. Thermal and electrical conductivity are lower than for CuZn37. Corrosion resistance is similar to pure copper. Processing properties: warm forming: very good cold forming: good machinability: moderately hard soldering: good soft soldering: very good TIG-welding: moderately burnishing: very good CuZn40 is used for hot-pressed forgings, metal fitting and lock components, for nipple wire, condenser bottoms and watchcases.

Properties

General

Property	Temperature	Value
Density	20.0 °C	8.4 - 8.41 g/cm³

Mechanical

Property	Temperature	Value
Elastic modulus	-195.0 °C	108 GPa
	-100.0 °C	106 GPa
	20.0 °C	102 - 105 GPa
	50.0 °C	100 GPa
	100.0 °C	93 - 99 GPa
	150.0 °C	91 GPa
	200.0 °C	89 - 94 GPa
	250.0 °C	83 GPa
	300.0 °C	89 GPa
	400.0 °C	83 GPa
	500.0 °C	74 GPa
	600.0 °C	64 GPa
	700.0 °C	54 GPa

Elongation	20.0 °C	20 %
Hardness, Brinell	20.0 °C	70 - 170 [-]
Hardness, Vickers	20.0 °C	70 - 110 [-]
Poisson's ratio	20.0 °C	0.34 [-]
Shear modulus	20.0 °C	37 GPa
Tensile strength	20.0 °C	300 MPa
Yield strength Rp0.2	20.0 °C	100 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	375 - 377 J/(kg·K)
Thermal conductivity	20.0 °C	109 - 117 W/(m·K)

Electrical

Property	Temperature	Value
Electrical conductivity	20.0 °C	1.39E+7 - 1.50E+7 S/m
Electrical resistivity	20.0 °C	6.7E-8 Ω·m
Specific Electrical conductivity		24 - 26 % IACS

Chemical properties

Property	Value
Aluminium	0.05 %
Copper	59 - 61.5 %
Iron	0.2 %
Lead	0.2 - 0.3 %
Nickel	0.3 %
Tin	0.2 %

EN 12168 CuZn40 R500: Premium Copper Alloy for High-Performance Applications EN 10250‑4 X1NiCrMoCu25‑20‑5 Solution‑Annealed Steel (+AT) – High‑Performance Corrosion‑Resistant Alloy

Metal