Copper Nickel 70/30 Flat

Copper Nickel 70/30 Flat

Cupro Nickel 70/30 flat and Cupro Nickel 70/30 flat is a copper and nickel alloy with additions of iron and manganese. These elemental additions make it even more resistant to corrosion and erosion and with slightly improved strength level than alloy 90/10, making it suitable for more demanding applications.

Chemical composition

GRADE

 

Cu

Ni

Fe

Mn

Pb

Zn

Cu-Ni 70/30

Min

67

25

0.4

Max

30

30

0.1

1

0.05

1

Properties

Copper Nickel 70/30 flat possess good mechanical properties and exhibit high resistance to corrosion in any media especially seawater. Cu-Ni 70/30 flat and Cu-Ni 70/30 flat have outstanding pitting and corrosion resistance in marine atmospheres. 

Mechanical Properties

Grade

Tensile Strength

Yield Strength

Elongation

[MPA]

[MPA]

(% in 50mm) min

Cu-Ni 70/30

345

140

30

The small addition of iron provides Cupro Nickel 70 / 30 flat or UNS C71500 an unexpected resistance to wide ranging corrosion and stress corrosion cracking, making it very appropriate and perfect for the marine or manufacturing industries.

Physical properties

Grade

Density (g/cm3)

Melting Range °C

Elastic Modulus (GPa)

Coeff of Thermal Expansion (μm/m/°C)

Thermal Conductivity (W/m.K)

Specific Heat (J/Kg.K)

Electrical Resistivity (μΩ.cm)

10-300°C

at 100°C

0-100°C

Cu-Ni 70/30

8.94

1170-1240

150

16.2

29

377

34

Cupro Nickel 70/30 exhibits superb resistance to attacks from steam, boiler feed-water and freshwater. Cu-Ni 70/30 flats or UNS C71500 can withstand attacks from sulfuric acid, phosphoric acid and also from mild organic acids.

Application

Copper Nickel 70/30 Alloy flat has a long and successful history in the marine sector that has since extended to industries including offshore oil and gas, power generation, desalination and cooling plants.

The alloy is also used for seawater service, submarine, offshore fire water systems, heat exchangers, condensers, and areas where high corrosion resistance is required and concern over chloride stress-corrosion cracking prevents the use of stainless steels.

Shalco Industries is a manufacturing company of Flat in India and Global Supplier.