What is Copper Nickel 70/30 Plate (UNS C71500)?

Copper Nickel 70/30 Plate (UNS C71500) is a copper-nickel alloy containing 30% nickel, known for excellent seawater corrosion resistance, strength, and durability in marine applications.

What is the difference between Copper Nickel 70/30 Sheet, Plate and Coil?

Sheets are 0.15 mm to 6.35 mm thick, plates are above 6.35 mm, and coils are rolled sheets supplied in continuous form.

Do you supply custom Copper Nickel 70/30 Plates and Sheets?

Yes, custom-cut Copper Nickel 70/30 Plates, Sheets, and Tubesheets are available with cutting, machining, and finishing services.

Copper Nickel 70/30 Plates,Sheets & Coils Supplier in India

Q: What standards apply to Cu-Ni 70/30 Plates and Sheets?

Cu-Ni 70/30 Plates follow ASTM B171 / ASME SB171 standards, while sheets comply with ASTM B122. The UNS designation is C71500.

Q: How does Cu-Ni 70/30 compare to Cu-Ni 90/10?

Cu-Ni 70/30 offers better corrosion resistance and strength than Cu-Ni 90/10, making it ideal for high-velocity seawater and aggressive environments.

Q: What industries use Copper Nickel 70/30 Plates?

Industries include marine, desalination, oil and gas, heat exchangers, shipbuilding, and chemical processing.

30+ Years of Industry Experience | 50+ Countries Supplied | ISO 9001:2015 Certified | EN 10204 3.1 / 3.2 MTC

What is Copper Nickel 70/30?

Copper Nickel 70/30 (also known as Cupro Nickel 70/30, CuNi 70/30, Alloy 715, or Cunifer 70/30) is a copper-based alloy containing approximately 30% nickel, along with carefully controlled additions of iron and manganese. It is designated as UNS C71500 under American standards and WNR 2.0882 under European (DIN) classification.

This alloy has an enhanced corrosion resistance (especially in marine and seawater), high tensile strength, high formability and weldability, and high biofouling resistance. Iron and manganese additions further augment the erosion-corrosion resistant properties, thus Cu-Ni 70/30 is more appropriate than Copper Nickel 90/10 in high velocity and aggressive saline water environments.

Amardeep Steel Centre stocks and supplies Cu-Ni 70/30 Plates, Sheets, Strips, Coils, and Foils to meet the most demanding industrial and marine specifications from standard ASTM B171 plates to custom-cut tubesheets and precision slit coils.

Copper Nickel 70/30 Plates, Sheets & Coils Specifications (ASTM B171 / ASME SB171 / C71500)

Standard	Description	Grade / UNS
ASTM B171 / ASME SB171	Copper-Alloy Plate for Pressure Vessels, Condensers and Heat Exchangers	C71500
ASTM B122 / ASME SB122	Copper-Nickel-Zinc Alloy and Copper-Nickel Sheet, Strip and Plate	C71500
ASTM B432 / ASME SB432	Copper and Copper Alloy Clad Plate	C71500
ASTM B552 / ASME SB552	Seamless Copper-Nickel Tubes for Water Desalting Plants	C71500
DIN / WNR	European Standard	2.0882
BS / EN	British / European Standard	CN102 / CW352H
MIL-C-15726	US Military Specification	C71500
NES 780	Naval Engineering Standard (UK)	C71500
SAE	Automotive / Engineering Standard	J461 / J463

Cu-Ni 70/30 Plate, Sheet, Strip & Coil Sizes, Dimensions & Tolerances

Form	Thickness	Width	Length / Coil OD
Foil	< 0.15 mm	Up to 1500 mm	As per coil
Sheet (CR / HR)	0.15 mm – 6.35 mm	1000–2500 mm	1000–6000 mm / custom
Plate (CR / HR)	> 6.35 mm – 100 mm	Up to 3500 mm	Up to 12000 mm / custom
Coil / Strip	0.1 mm – 6 mm	1000 / 1219 / 1500 / 2000 mm	2000–6000 mm coil length
Shim Sheet	0.01 mm – 3 mm	Custom	Custom

Surface Finishes Available

Hardness Conditions

Soft (Annealed) | Quarter Hard | Half Hard | Hard

Copper Nickel 70/30 Chemical Composition (UNS C71500 / DIN 2.0882)

Element	Min %	Max %	Notes
Copper (Cu)	65.0	Remainder	Balance
Nickel (Ni) + Cobalt	29.0	33.0	Primary alloying element
Iron (Fe)	0.40	1.0	Enhances corrosion/erosion resistance
Manganese (Mn)	—	1.0	Improves strength and weldability
Lead (Pb)	—	0.05	Impurity limit
Zinc (Zn)	—	0.50	Impurity limit
Carbon (C)	—	0.05	Impurity limit
Sulfur (S)	—	0.02	Impurity limit

Mechanical Properties of Copper Nickel 70/30 Plates & Sheets

Property	Annealed (Soft)	Half Hard	Hard
Tensile Strength (MPa)	380 – 450	480 – 560	≥ 560
Yield Strength 0.2% (MPa)	125 – 170	350 – 420	≥ 430
Elongation (%)	≥ 30	≥ 10	≥ 3
Hardness (HRB)	45 – 60	70 – 85	85 – 95
Density (g/cm³)	8.94
Melting Point (°C)	1170 – 1240
Thermal Conductivity (W/m·K)	29
Modulus of Elasticity (GPa)	152

Copper Nickel 70/30 Plate Features, Properties & Corrosion Resistance

Corrosion Resistance

Exceptional resistance to marine seawater (up to 4.5 m/s velocity)
Resistant to sulfuric acid, phosphoric acid, mild organic acids
Withstands sulfates, chromates, nitrates, alkaline chlorides
Resistant to CO₂, bromine, dry and wet chlorine at ambient temperatures
Superior performance in polluted seawater vs. Cu-Ni 90/10

Mechanical Advantages

Moderate to high tensile strength
Excellent formability — cold and hot workable
Good weldability (GTAW, GMAW, PLASMA, SAW)
Improved strength vs. Cu-Ni 90/10 at high temperature and pressure
Dimensional accuracy up to 100%

Thermal & Electrical Properties

High thermal and electrical conductivity
Excellent biofouling resistance (self-limiting marine growth)
Maintains strength at elevated temperatures and pressures
Excellent resistance to erosion from high-velocity fluids

Processing & Fabrication

Available Hot Rolled (HR) and Cold Rolled (CR)
Waterjet, plasma, laser and oxy-propane cutting
Edging, deburring, grinding, and bending services
Custom tubesheet and disc fabrication available

Applications of Copper Nickel 70/30 Plates & Sheets

Cu-Ni 70/30 (UNS C71500) is the alloy of choice where high-velocity seawater, biofouling, corrosion, and elevated pressures demand superior performance. Primary application sectors include:

Marine & Offshore Structures
Desalination Plants
Heat Exchangers & Condensers
Oil & Gas Processing
Chemical Processing Equipment
Shipbuilding (hull cladding, sea chests)
Seawater Cooling Systems
Pump Bodies & Propeller Sleeves
Power Generation Equipment
Boiler Feed-Water Systems
Process Pressure Vessels
Pharmaceutical & Food Processing

Equivalent Grades of Cu-Ni 70/30 (UNS C71500 / WNR 2.0882 / EN CW352H)

Standard	Grade / Designation
UNS (USA)	C71500
ASTM / ASME	B171 / SB171, B122 / SB122, B432, B466, B552, B111, B151
DIN (Germany)	2.0882 / CuNi30Fe1Mn
BS (UK)	CN102
EN	CW352H
MIL (Military)	MIL-C-15726, MIL-T-15005, MIL-T-16420, MIL-T-22214
NES (Naval)	NES 780
SAE	J461 / J463
Trade Name	Cunifer 70/30, Alloy 715, CuNi 715

Packaging, Testing & Documentation

Packaging

Wooden pallets with bubble wrap protection
Plastic film coating available (plastic coated plates)
Export-worthy sea-worthy packing
Interleaved paper packing for sheet protection

Testing & Certification

EN 10204 Type 3.1 and 3.2 Mill Test Certificate (MTC)
Chemical Composition & Mechanical Test Reports
Hardness Test, PMI Test (Positive Material Identification)
Ultrasonic Test, Radiography, Hydrostatic Test
NACE MR0175 / ISO 15156 compliance available

Get the Best Price on Cu-Ni 70/30 Plates & Sheets

Request a quote today. We supply to UAE, Saudi Arabia, UK, USA, Singapore, South Africa, Germany, and 50+ countries worldwide.

Request a Quote

Frequently Asked Questions About Copper Nickel 70/30 Plates

What is Copper Nickel 70/30 (UNS C71500)?

Copper Nickel 70/30 (UNS C71500) is a copper-based alloy containing approximately 30% nickel, along with small additions of iron and manganese. Also known as Cupro Nickel 70/30, Alloy 715, or Cunifer 70/30, it offers excellent corrosion resistance — especially in marine and seawater environments — combined with moderate to high tensile strength and good formability.

What standards apply to Cu-Ni 70/30 Plates and Sheets?

The primary standards are ASTM B171 / ASME SB171 for plates and ASTM B122 / ASME SB122 for sheets and strips. The UNS designation is C71500, and the European Werkstoff number is WNR 2.0882. Equivalent specifications include MIL-C-15726, DIN 2.0882, BS CN102, EN CW352H, NES 780, and SAE J461/J463.

What is the difference between Cu-Ni 70/30 Sheet, Plate, and Coil?

Thickness less than 0.15 mm is classified as Foil. Thickness from 0.15 mm to 6.35 mm is a Sheet. Thickness greater than 6.35 mm is a Plate. A Coil is a long rolled sheet or strip wound into cylindrical form. All forms are available in both Hot Rolled (HR) and Cold Rolled (CR) condition.

How does Cu-Ni 70/30 compare to Cu-Ni 90/10?

Cu-Ni 70/30 (C71500) offers higher nickel content, which translates to greater corrosion resistance in seawater — particularly at high flow velocities (up to 4.5 m/s) and in polluted or aggressive marine environments. It also has superior tensile strength and is better suited to higher-temperature and higher-pressure applications than Cu-Ni 90/10 (C70600).

What industries use Copper Nickel 70/30 Plates?

Cu-Ni 70/30 Plates are widely used in marine and offshore engineering, desalination plants, heat exchangers and condensers, oil & gas processing, seawater cooling systems, boiler feed-water equipment, chemical processing, ship hulls and sea chests, pump bodies, propeller sleeves, and power generation.

What surface finishes are available for Cu-Ni 70/30 Sheets?

Amardeep Steel supplies Cu-Ni 70/30 Sheets and Plates in 2B, 2D, BA (Bright Annealed), No.1, No.4, No.8, 8K (mirror), brushed, hairline, sandblasted, embossed, checkered, and glossy finishes to suit various industrial requirements.

Do you supply custom-cut Cu-Ni 70/30 Plates and Tubesheets?

Yes. Amardeep Steel offers custom-cut Cu-Ni 70/30 Plates, Sheets, Discs, Circles, and Tubesheets as per customer specifications. Value-added services include waterjet cutting, plasma cutting, laser cutting, edging, deburring, grinding, and bending. We can also supply plates in compliance with NACE MR0175 for sour service environments.