EN 1652 Grade CuSn5 R400 – Premium Copper‑Tin Alloy for Precision Springs

Material CuSn5, mat. No. CW451K is used in the form of tubes for manometer springs or hose tubes as well as for contact springs and connectors. Basically the same application area as CuSn6 (CW452K). CuSn5 shows slightly higher electrical conductivity at slightly lower strength due to the lower tin-content. For the electrolytically tinned strip the coatings (Sn bright, Sn matt, Sn fuzed, SnPb) are listed by the application (better solderability, better corrosion resistance, reduction of the electrical contact resistance, better appearance) in the DIN EN 14436 : 2004-11 (Table 5)

Properties

General

Property	Temperature	Value
Density	20.0 °C	8.85 - 8.9 g/cm³

Mechanical

Property	Temperature	Value
Elastic modulus	20.0 °C	120 GPa
Elongation	20.0 °C	17 %
Elongation A50	20.0 °C	14 - 17 %
Poisson's ratio	20.0 °C	0.34 [-]
Tensile strength	20.0 °C	400 - 500 MPa
Yield strength Rp0.2	20.0 °C	240 MPa

Thermal

Property	Temperature	Value	Comment
Coefficient of thermal expansion	23.0 °C	1.5E-5 - 1.9E-5 1/K	Typical for Leaded Phosphor Bronze
Specific heat capacity	20.0 °C	380 J/(kg·K)
Thermal conductivity	20.0 °C	96 W/(m·K)

Electrical

Property	Temperature	Value
Electrical conductivity	20.0 °C	1.00E+7 S/m
Specific Electrical conductivity		17 % IACS

Chemical properties

Property	Value
Iron	0.1 %
Lead	0.02 %
Nickel	0.2 %
Phosphorus	0.01 - 0.4 %
Tin	4.5 - 5.5 %
Zinc	0.2 %

EN 1652 CuSn4 R610: Premium Tin-Copper Alloy with Superior Formability & Corrosion Resistance EN 1652 Grade CuSn5 R490 – Premium Copper‑Tin Alloy for Precision Tubes & Connectors

Metal