EN 12451 CuZn28Sn1As O50 – Superior Corrosion Resistance & Formability

CuZn28Sn1As (CW706R former identification: CuZn28Sn1) is an unhardenable copper alloy. High hardness and strength parameter are achievable by cold forming only. Tin increases corrosion resistance and improves sliding qualities. CuZn28Sn1As is dezincification resistant and resistant to river and industrial water. Processing properties: warm forming: good cold forming: moderately machinability: moderately hard soldering: moderately soft soldering: very good TIG-welding: good burnishing: very good This special brass material is predominantly applicated in the form of tubes for freshwater carrying pipes or for heat-exchanger. To the operating conditions applies that the content of solute substances in cooling water is not allowed to exceed 0,1% and the pH-value for water is not allowed to decrease below 7,0. In the case of corrosion attack due to sedimentations tubes made of CW706R are more resistant than tubes of binary copper-zinc alloys. The material is applicable for water speeds up to 2m/s. Further application for bottoms and plates for condenser and other heat-transformer, ribbed tubes as well as for cooler in on shore appliances.

Properties

General

Property	Temperature	Value
Density	20.0 °C	8.56 g/cm³

Mechanical

Property	Temperature	Value
Elastic modulus	20.0 °C	110 GPa
Elongation	20.0 °C	55 %
Hardness, Vickers	20.0 °C	60 [-]
Shear modulus	20.0 °C	41 GPa
Tensile strength	20.0 °C	320 MPa
Yield strength Rp0.2	20.0 °C	100 MPa

Thermal

Property	Temperature	Value	Comment
Coefficient of thermal expansion	200.0 °C	1.95E-5 1/K
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	109 W/(m·K)

Electrical

Property	Temperature	Value
Electrical conductivity	20.0 °C	1.41E+7 S/m
Electrical resistivity	20.0 °C	7.1E-8 Ω·m

Chemical properties

Property	Value
Arsenic	0.02 - 0.035 %
Copper	70 - 72.5 %
Iron	0.07 %
Lead	0.07 %
Manganese	0.1 %
Nickel	0.1 %
Phosphorus	0.01 %
Tin	0.9 - 1.3 %

X17CrNi16-2 Soft Annealed Steel – DIN 17440 Grade for Pressure Vessels & Industrial Applications EN 12451 CuZn28Sn1As R320 Alloy – Ideal for Heat Exchangers & Desalination Tubes

Metal