High Quality Copper Nickel Sheets & Plates

70/30 • 90/10 • Formable • Ductile • Machinable

Cupronickel 70/30 and 90/10 Sheets & Plates

Premium Copper Nickel 70/30 & 90/10 Sheets & Plates by Ratnadeep Steel & Engg.

Ratnadeep Steel & Engg. Co. is a trusted manufacturer, exporter, and supplier of high-quality Copper Nickel Sheets and Plates in both 70/30 and 90/10 grades. Based in Mumbai, India, we specialize in delivering premium Copper-Nickel alloy products engineered for exceptional corrosion resistance, outstanding strength, and long service performance—especially in seawater and marine environments. Our Copper Nickel plates are produced using advanced alloy compositions enriched with copper, nickel, and strengthening elements such as iron and manganese, ensuring superior resistance to biofouling, stress corrosion cracking, and erosion in flowing seawater conditions.

Cu-Ni 90/10 (90% Copper, 10% Nickel) and Cu-Ni 70/30 (70% Copper, 30% Nickel) are globally recognized for their excellent corrosion resistance, thermal stability, and durability. 90/10 grade offers outstanding fabricability, good mechanical strength, and cost-effectiveness, making it widely suitable for general marine and heat exchanger applications. 70/30 grade, with its higher nickel content, provides superior strength and enhanced resistance to fast-moving seawater, high-pressure systems, and aggressive environments—making it ideal for demanding naval, offshore, and industrial applications. These alloys also exhibit excellent weldability, formability, and anti-microbial properties, making them reliable for various critical engineering uses.

At Ratnadeep Steel & Engg. Co., every Copper Nickel Sheet and Plate undergoes stringent quality inspections to ensure full compliance with international standards and specific client requirements. We supply Cu-Ni 70/30 and Cu-Ni 90/10 Sheets and Plates in a wide range of thicknesses, sizes, tempers, and custom configurations to suit diverse marine, industrial, and engineering applications. With our commitment to precision, quality, and timely delivery, we continue to be a preferred global supplier of high-performance Copper Nickel products for corrosion-resistant, long-lasting, and technically demanding environments.

Copper Nickel Sheets & Plates

CuNi 70/30 Sheets & Plates
CuNi 90/10 Sheets & Plates

Our Copper Nickel 70/30 & 90/10 Sheets & Plates are available in a variety of size, depending on the specific demands of your project.

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Copper Nickel (CuNi) 70/30 Sheets and Plates

Explore Copper Nickel 70/30 Sheets and Plates

Copper Nickel 70/30 Sheets and Plates

Copper Nickel (CuNi) 90/10 Sheets and Plates

Explore Copper Nickel 90/10 Sheets and Plates

Copper Nickel 90/10 Sheets and Plates

Copper Nickel 90/10 (Cu-Ni 90/10)

90% Copper & 10% Nickel alloy
Excellent resistance to seawater corrosion
Contains iron & manganese for added strength
Good weldability and ease of fabrication
Preferred for marine & desalination systems
Minimum tensile strength: ~275–310 MPa
Exceptional resistance to biofouling
Used in condensers, heat exchangers & seawater pipes
Cost-effective solution for general marine applications

Copper Nickel 70/30 (Cu-Ni 70/30)

70% Copper & 30% Nickel alloy
Higher strength & corrosion resistance than 90/10
Excellent performance in high-velocity seawater
Superior resistance to erosion & cavitation
Minimum tensile strength: ~360–400 MPa
Highly reliable for offshore & naval systems
Used in high-pressure seawater piping & heat exchangers
Ideal for demanding marine & industrial applications
Maintains performance in aggressive chloride environments

The materials we supply undergo a comprehensive range of quality assurance procedures, including eddy current testing, hydrostatic testing, ultrasonic examination, and other essential NDT methods, along with detailed chemical and mechanical property evaluations. Each product is thoroughly inspected at multiple stages of manufacturing to ensure it is free from defects and suitable for demanding industrial applications. Our rigorous testing standards guarantee consistent quality and reliability. In addition, all products are manufactured in accordance with relevant industry norms and specifications, making them fully compliant and widely accepted in both domestic and international markets.

Frequently Asked Questions (FAQs)

What is the difference between Copper Nickel 70/30 and Copper Nickel 90/10?

Copper Nickel 70/30 contains 70% copper and 30% nickel, offering higher strength and superior resistance to seawater corrosion. Copper Nickel 90/10 contains 90% copper and 10% nickel, providing excellent corrosion resistance with better formability and cost-effectiveness for moderate marine applications.

What are Copper Nickel Sheets & Plates used for?

Copper Nickel Sheets & Plates are widely used in shipbuilding, offshore platforms, desalination plants, heat exchangers, condensers, seawater piping systems, marine engineering, power generation, oil & gas, and chemical processing industries.

Why are Copper Nickel alloys preferred for seawater applications?

Copper Nickel alloys offer exceptional resistance to seawater corrosion, erosion, biofouling, and marine organisms, making them one of the most reliable materials for long-term marine and offshore service.

Can Copper Nickel Sheets & Plates be welded and fabricated?

Yes. Copper Nickel Sheets & Plates provide excellent weldability, formability, and fabrication properties, making them suitable for manufacturing heat exchangers, condensers, pressure vessels, marine components, and industrial equipment.

Which industries use Copper Nickel Sheets & Plates?

Copper Nickel Sheets & Plates are extensively used in marine engineering, shipbuilding, offshore oil & gas, desalination plants, power generation, chemical processing, defense, naval, and heat exchanger manufacturing industries.

What are the advantages of Copper Nickel Sheets & Plates?

Copper Nickel Sheets & Plates offer excellent seawater corrosion resistance, outstanding resistance to biofouling, high mechanical strength, good weldability, excellent thermal conductivity, long service life, and low maintenance requirements.

Does Ratnadeep Steel & Engg. Co. supply Copper Nickel Sheets & Plates in custom sizes?

Yes. Ratnadeep Steel & Engg. Co. supplies Copper Nickel 70/30 and Copper Nickel 90/10 Sheets & Plates in a wide range of thicknesses, widths, lengths, and custom dimensions to meet specific project requirements.

Which Copper Nickel grade should I choose?

Copper Nickel 90/10 is suitable for general marine, condenser, and seawater applications, while Copper Nickel 70/30 is recommended for more demanding offshore, naval, desalination, and high-velocity seawater systems where greater strength and corrosion resistance are required.

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Looking for high-quality Copper Nickel 70/30 and 90/10 Sheets & Plates? Our products are manufactured in compliance with ASTM B171 and ASME SB171 standards. Get in touch with us today.