Ninthore Overseas is one of the Leading Manufacturer And Exporter of High Quality Cupro Nickel 70 Washers, which is offered at leading market rates to our patrons. We can offer you Cu-Ni 70 / 30 Flat Washers (C71500) cut to your specifications through our precision plate saws, bar saws, shears and water jets. Another application of Cupro Nickel 70 / 30 Lock Washers is in the electrical engineering space where it can be used in the production of heating cables, anodes for television tubes and electric resistors. The alpha dendrites in the cast structures of Copper Nickel 70 / 30 Sealing Washers contain a large amount of nickel starting from the center up to the edge of the dendrite. 

Another common use of Cu-Ni 70 / 30 Split Washers is in silver – color modern – circulated coins which are a typical mix of 75 % copper, 25 % nickel, and a trace amount of manganese. Cupro Nickel 70 / 30 Slot Washers is often used in Factors; Development; Resistance; Reasoning; Microfouling; Tubing, Cladding and Offshore Structures; Removal; Effects on Corrosion; Effects on Plant Operations.

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Our clients can purchase Copper Nickel 70 / 30 Machine Washers in a mass amount from us at reasonable rates, which can also further cut to your requirements along with custom forgings made to your requirements. Cu-Ni 70 / 30 Star Washers is the most commonly used wrought copper alloy for marine engineering and can be found in seawater systems for naval.

Cu-Ni Alloy 70/30 Washer Specifications
Specifications : ASTM
Standard : ASTM B151, B152
Length : M02 to M30
Size : M10 to M100
Type : Flat Washer, Lock Washer, Sealing Washer, Split Washer, Slot Washer, Machine Washer, Star Washer SPRINGS – Wire Spring & Flat Spring

Copper Nickel Cu 70/30 Washers Chemical Composition

Cu-Ni 70/30 Cu Pb Mn Fe Zn Ni
88.6 min 0.05 max 1.0 max 1.8 max 1 max 9-11 max

Cu-Ni 70/30 Washer Mechanical Properties

Density Melting Point Yield Strength (0.2%Offset) Tensile Strength Elongation
8.1 g/cm3 1443 °C (2430 °F) Psi – 35,000, MPa – 241 Psi -80,000, MPa -551 30 %

Equivalent Grades for Copper Nickel 70/30 Washer

Cupro Nickel 70/30 C71500 2.0882

Alloy Cu-Ni 70/30 Washers Application Industries

  • Off-Shore Oil Drilling Companies
  • Power Generation
  • Petrochemicals
  • Gas Processing
  • Specialty Chemicals
  • Pharmaceuticals
  • Pharmaceutical Equipment
  • Chemical Equipment
  • Sea Water Equipment
  • Heat Exchangers
  • Condensers
  • Pulp and Paper Industry

70/30 Cu-Ni Washers Test Certificates

We at Ninthore Overseas provide Manufacturer TC (Test Certificate) in accordance to EN 10204/3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report. We also provide Standard certificates like EN 10204 3.1 and additional requirement like. NACE MR 01075. FERRIT CONTENT as per norms if requested by clients.

• EN 10204/3.1B,
• Raw Materials Certificate
• 100% Radiography Test Report
• Third Party Inspection Report, etc.

Material Testing

We at Ninthore Overseas ensure that all our materials go through strict quality tests before dispatching them to our clients.

• Mechanical Testing Such as Tensile of Area
• Hardness Test
• Chemical Analysis – Spectro Analysis
• Positive Material Identification – PMI Testing
• Flattening Test
• Micro and Macro Test
• Pitting Resistance Test
• Flaring Test
• Intergranular Corrosion (IGC) Test


• Commercial Invoice which includes HS Code
• Packing List including net weight and gross weight, number of boxes, Marks and Numbers
• Certificate of Origin legalized/attested by Chamber of Commerce or Embassy
• Fumigation Certificates
• Raw Material Test Reports
• Material Traceability Records
• Quality Assurance Plan (QAP)
• Heat Treatment Charts
• Test Certificates certifying NACE MR0103, NACE MR0175
• Material Test Certificates (MTC) as per EN 10204 3.1 and EN 10204 3.2
• Guarantee Letter
• NABL approved Laboratory Test Reports
• Welding Procedure Specification/Procedure Qualification Record, WPS/PQR
• Form A for the purposes of the Generalized System of Preferences (GSP)



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