What are Copper Nickel Flanges?
Copper nickel flanges (also called cupro nickel flanges or CuNi flanges) are made from a special alloy with high copper content and approximately 10% or 30% nickel, along with trace elements such as iron and manganese. The combination of these metals provides excellent strength and corrosion resistance in harsh environments.
Copper nickel flanges / cupro nickel flanges are manufactured from ASTM B151-compliant Cu-Ni alloys, including UNS C70600 (90/10) and UNS
C71500 (70/30), using closed-die and open-die hot forging processes followed by machining to dimensional tolerances per ASME B16.5.
These flanges perform reliably in seawater, chemical processing, and offshore environments where chloride-induced corrosion would degrade carbon or stainless steel alternatives.
Copper Nickel Flanges Manufacturer in India | ISO 9001:2015 Certified
Established in 1997, Amardeep Steel Centre LLP is an ISO 9001:2015 certified copper nickel flanges manufacturer and exporter based in Mumbai, India. Our Cu-Ni flanges come with MTC EN 10204 3.1 and 3.2, and can be inspected by third parties, BV, DNV and TUV, upon request. We keep everything in stock to ship fast with regular delivery within 5-10 business days throughout India and export deliveries to 80+ countries.
Amardeep Steel is a major manufacturer of Copper Nickel Flanges, Copper Nickel Pipes and various fittings that are utilized in a broad variety of applications. Cu-Ni Flanges can be used in marine environments and for high-pressure piping. C70600 Flange is very popular in shipbuilding. Our 90/10 copper nickel socket weld flanges are frequently used in small size high-pressure piping. Copper Nickel Flanges have the same amount of static and fatigue strength as slip-on RF flanges, but are made to operate with higher pressure.
Cu-Ni alloys can withstand temperatures up to 300 degrees C, and are authorized to operate in seawater under NACE MR0175, so they are the most popular pipeline material used in offshore and marine piping.
Copper Nickel Flanges are known to be of high quality in terms of corrosion resistance and durability of performance in extreme conditions. Amardeep Steel provides top-quality, certified solutions according to your specification.
What is the Purpose of a Copper Nickel Flange?
A Copper Nickel Flange is engineered to interconnect pipes with each other and with valves, fittings, and specialty items such as strainers and pressure vessels. A cover plate can also be applied to form a blind flange, which seals the pipe end. Bolts are used to secure these flanges, which are normally sealed with gaskets or other sealing means, so as to maintain a leak-free connection.
What are the Applications of Copper Nickel Flanges?
Copper Nickel Flanges are widely used in marine, offshore, water treatment, desalination, and chemical industries. In shipbuilding, they are required in the construction of valves, pumps, and hull sheathing. In power plants, they are used in condenser tubes. They can also be used in electrical and electronic applications due to their high durability and resistance to corrosion.
Specific application areas include:
- Seawater cooling systems (Class 300 WNRF)
- Offshore oil and gas platform piping (NACE MR0175 service)
- Naval and commercial shipbuilding (NAVSEA MIL-F-20042 compliant flanges)
- Desalination plant feed lines
- LNG terminal condensate headers
- Chemical plant process piping
- HVAC condensers and heat exchangers
What are the Advantages of Copper Nickel Flanges?
Copper Nickel Flanges are highly resistant to corrosion and are therefore suitable for hostile environments including marine, offshore, and chemical processing service.
Cu-Ni 90/10 flanges (C70600) tolerate up to 300 degrees C and 900 psig. Cu-Ni 70/30 flanges (C71500) provide 15 to 20% higher tensile strength (minimum 380 MPa UTS) and superior resistance to high-velocity seawater erosion above 3 m/s. Both grades offer stress corrosion cracking (SCC) immunity that Type 316L stainless steel cannot match in chloride-rich environments.
Cu-Ni 90/10 vs Cu-Ni 70/30 Flanges: Which Grade Should You Choose?
The two most commonly specified copper nickel alloy grades are C70600 (90/10) and C71500 (70/30). The right choice depends on your operating environment, pressure class, and budget.
| Parameter | Cu-Ni 90/10 (C70600) | Cu-Ni 70/30 (C71500) |
|---|---|---|
| Nickel content | 10% | 30% |
| Seawater corrosion resistance | Good | Excellent |
| Tensile strength | 275 MPa | 380 MPa |
| Relative cost | Lower | 20 to 35% higher |
| Typical use | General marine piping, HVAC, condensers | High-velocity seawater, naval ships, offshore platforms |
Copper Nickel Flanges (Cu-Ni Flanges) Equivalent Grades
| Standard | Werkstoff Nr. | UNS |
|---|---|---|
| Copper Nickel 90/10 | 2.0872 | C70600 |
| Copper Nickel 70/30 | 2.0882 | C71500 |
Copper Nickel Flange Chemical Composition (ASTM B151)
| Element | Cu-Ni 90/10 (C70600) | Cu-Ni 70/30 (C71500) |
|---|---|---|
| Copper (Cu) | Rem. (86 to 89%) | Rem. (65 to 70%) |
| Nickel (Ni) | 9.0 to 11.0% | 29.0 to 33.0% |
| Iron (Fe) | 1.0 to 1.8% | 0.40 to 1.0% |
| Manganese (Mn) | 1.0% max | 1.0% max |
| Lead (Pb) | 0.02% max | 0.02% max |
Copper Nickel Flange Mechanical Properties
| Property | Cu-Ni 90/10 (C70600) | Cu-Ni 70/30 (C71500) |
|---|---|---|
| Tensile Strength (min) | 275 MPa (40 ksi) | 380 MPa (55 ksi) |
| Yield Strength (min) | 105 MPa (15 ksi) | 140 MPa (20 ksi) |
| Elongation (min) | 30% | 30% |
| Hardness (Brinell) | 80 HB max | 100 HB max |
HS Code of Copper Nickel Flanges
| Product Description | HS Code |
|---|---|
| 90/10 Copper Nickel Flanges | 74122090 |
| 70/30 Copper Nickel Flanges | 74122090 |
Weight Chart of Copper Nickel (Cu/Ni) Flanges
| Size (Inches) | Bore / Wall Thickness | Approx. Weight (LBS) | Approx. Weight (KG) |
|---|---|---|---|
| 1/2 | Sch 40 (Std) | 1.2 | 0.54 |
| 3/4 | Sch 40 (Std) | 1.7 | 0.77 |
| 1 | Sch 40 (Std) | 2.2 | 1.00 |
| 1-1/4 | Sch 40 (Std) | 2.9 | 1.32 |
| 1-1/2 | Sch 40 (Std) | 3.7 | 1.68 |
| 2 | Sch 40 (Std) | 5.7 | 2.59 |
| 2-1/2 | Sch 40 (Std) | 9.0 | 4.08 |
| 3 | Sch 40 (Std) | 10.5 | 4.76 |
| 3-1/2 | Sch 40 (Std) | 13.0 | 5.90 |
| 4 | Sch 40 (Std) | 14.2 | 6.44 |
| 5 | Sch 40 (Std) | 16.0 | 7.26 |
| 6 | Sch 40 (Std) | 19.4 | 8.80 |
| 8 | Sch 40 (Std) | 31.3 | 14.20 |
| 10 | Sch 40 (Std) | 42.3 | 19.19 |
| 12 | Sch 40 (Std) | 69.6 | 31.57 |
Weights are approximate for Sch 40 standard wall per ASME B16.5 Class 150. For other schedules or pressure classes, contact Amardeep Steel for dimensional data sheets.
Copper Nickel Flange Price List
Looking for Premium Copper Nickel Flanges at the Best Price? Contact us for a current price list with MTC EN 10204 3.1.
Get Current Price List: sales@amardeepsteel.com
View Price ListCopper nickel 70/30 flange prices in India range from Rs. 1,500 to Rs. 12,000+ per piece depending on size (1/2 inch to 24 inch), pressure class (Class 150 to 2500), and order quantity. 90/10 flanges are typically 20 to 30% lower cost than 70/30 due to lower nickel content. Contact us for a formal quotation with MTC EN 10204 3.1.
Copper Nickel Flanges Available Types
| Type Description |
|---|
| Copper Nickel Flanges |
| Cupro Nickel EN 1092-1 Flanges |
| Copper Nickel 70/30 BS 4504 Flanges |
| Copper Nickel 90/10 Forged Flanges |
| Copper Nickel UNS C70600 Flanges |
| Cu-Ni 70/30 Slip On Flanges |
| Copper Nickel UNS C71500 Flat Flange Suppliers |
| ANSI 90/10 Copper Nickel Blind Flange |
| Copper Nickel DIN 2.0872 Weld Neck Flanges Dealer |
| Cu-Ni 70/30 Socket Weld Flanges Exporter |
| Cu-Ni 70/30 Long Weld Neck Flanges Stockholder |
| Cupro Nickel 90/10 Threaded Flanges Distributors |
| Cu-Ni 90/10 Reducing Flanges |
| Cu-Ni DIN 2.0882 Ring Type Joint Flanges Manufacturer |
| Copper Nickel 70/30 Orifice Flange |
| Copper Nickel 90/10 Spectacle Blind Flanges |
| Copper Nickel 70/30 WNRF Flange |
| Copper Nickel SORF Flanges |
| ANSI B16.5 Cu-Ni 90/10 RTJ Flanges |
| Copper Nickel Screwed Flanges Stockist |
| ASTM B171 Copper Nickel 90/10 Lap Joint Flanges |
| ASME SB171 Copper Nickel BLRF Flange |
| Copper Nickel 70/30 Raised Face Flanges |
| Cupro Nickel Nipoflange |
| Copper Nickel 90/10 Square Flanges |
| ASME SB171 Copper Nickel SWRF Flange |
| Copper Nickel Tongue and Groove Flanges |
| Cu-Ni 90/10 Male and Female Flanges |
| Copper Nickel DIN Flanges |
| 70/30 Copper Nickel ASME B16.5 Flanges |
How Are Copper Nickel Flanges Manufactured at Amardeep Steel?
Our manufacturing process follows strict quality protocols at every stage to ensure full ASME B16.5 compliance and dimensional accuracy.
- Raw Material Verification: ASTM B151 certified Cu-Ni billets are inspected against heat certification and chemical composition reports before production begins.
- Hot Forging: Billets are heated to 750 to 900 degrees C and die-forged to near-net shape using open-die or closed-die forging methods suitable for the order batch size.
- CNC Machining: Forged blanks are CNC machined to ASME B16.5 dimensional tolerances. Facing, boring, and drilling operations are performed to specification.
- Quality Control and Documentation: Each flange undergoes hydrostatic testing, dimensional inspection, and PMI (Positive Material Identification) verification. MTC EN 10204 3.1 documentation is issued with every shipment. Third-party inspection by BV, DNV, or TUV is available on request.
Cupro Nickel Flanges Exporter
Copper Nickel Flanges Export Destinations
Amardeep Steel is a prominent exporter of Cupro Nickel Flanges, delivering high-quality products to a diverse clientele across major cities in Europe and beyond.
Ukraine, Costa Rica, Macau, Bulgaria, Afghanistan, Ghana, Nigeria, New Zealand, Qatar, Taiwan, Morocco, Nepal, Malaysia, Portugal, Bolivia, Belgium, South Korea, Finland, Argentina, Azerbaijan, Kazakhstan, South Africa, Iran, Namibia, Chile, Bhutan, Israel, Yemen, Puerto Rico, Turkey, Croatia, Austria, Poland, Netherlands, Mongolia, Sweden, United Kingdom, Belarus, Germany, Colombia, Iraq, Gabon, Spain, United States, Ecuador, Philippines, Oman, Angola, Italy, Kenya, Lithuania, Lebanon, Gambia, Russia, Hong Kong, Ireland, Sri Lanka, Venezuela, Czech Republic, Romania, Greece, United Arab Emirates, Mexico, Bangladesh, Thailand, Australia, Estonia, Singapore, Indonesia, Switzerland, Norway, Pakistan, Bahrain, Hungary, Slovakia, Egypt, China, Jordan, Serbia, Peru, Trinidad and Tobago, Tunisia, Kuwait, Zimbabwe, Algeria, Japan, Canada, France, India, Iran, Tibet, Libya, Vietnam, Saudi Arabia, Denmark, Brazil.
Amardeep Steel is an ISO 9001:2015 certified supplier. Our Cupro Nickel Flanges are available with MTC EN 10204 3.1 and 3.2 certificates.
Frequently Asked Questions: Copper Nickel Flanges
What are the different types of copper nickel flanges?
Copper nickel flanges are available in types including weld neck, slip-on, blind, socket weld, threaded, lap joint, orifice, reducing, and ring type joint (RTJ), manufactured to ASME B16.5 in pressure classes 150 to 2500. They can also be custom-made to specific sizes and designs.
What are the considerations when selecting a copper nickel flange?
When choosing a copper nickel flange, you should consider the pressure and temperature ratings, compatibility of the material with the fluids being transported, material grade (90/10 or 70/30), standard specification, dimensions, class or pressure rating, flange face type, size, and application environment.
What are copper nickel flanges used for?
Copper nickel flanges are used in applications involving corrosive materials or high temperatures, such as chemical plants, water treatment facilities, steam lines, marine piping, desalination plants, offshore platforms, and naval shipbuilding.
What is the difference between Cu-Ni 90/10 and 70/30 flanges?
Cu-Ni 90/10 has 90% copper and 10% nickel, offering good corrosion resistance at lower cost. Cu-Ni 70/30 (70% copper, 30% nickel) provides higher tensile strength (380 MPa vs 275 MPa) and superior seawater corrosion resistance, particularly in high-velocity flow above 3 m/s. See the comparison table above for a full breakdown.
What is the price of copper nickel flanges in India?
Prices typically range from Rs. 800 to Rs. 5,000+ per piece depending on size, grade (90/10 or 70/30), pressure rating, and finish. Cu-Ni 70/30 flanges are typically 20 to 30% higher in cost than 90/10 due to higher nickel content. Contact Amardeep Steel for a formal quotation.
What is the delivery time for Cu-Ni flanges?
Standard delivery time is 5 to 10 days for ready stock and 2 to 4 weeks for custom or bulk orders.
Are copper nickel flanges suitable for seawater applications?
Yes, copper nickel flanges are highly resistant to seawater corrosion, making them ideal for marine and offshore use. Both C70600 and C71500 grades are approved for seawater service, with 70/30 preferred for high-velocity or aggressive seawater conditions.
What certifications do ASTM B151 copper nickel flanges require?
They typically come with Mill Test Certificate (MTC) EN 10204 3.1, along with chemical and mechanical test reports. Third-party inspection by Bureau Veritas (BV), DNV GL, or TUV Rheinland is available on request.
What is the HS code for copper nickel flanges?
The common HS code is 74122090 for both 90/10 and 70/30 copper nickel flanges (copper alloy pipe fittings).
What is the weight of a 4-inch Cu-Ni 90/10 slip-on flange?
Approximate weight for a 4-inch Sch 40 (Std) Cu-Ni 90/10 slip-on flange is 14.2 LBS (6.44 kg) at Class 150. Weight increases with pressure class; Class 300 and above will be heavier.
