Sea-Water Grade Cupro Nickel Flanges, Forged For Zero-Leak Piping Joints
Spectro-Tested Cu-Ni Melts
Every heat is checked for exact copper, nickel & iron ratio.
Class 150 To 2500 Bore Match
Every facing and drilling machined to the connecting pipe schedule.
Biofouling & Seawater Resistant
Stable protective film keeps marine piping joints leak-free for years.
Heat-Number Batch Traceability
Each flange lot ties back to its own mill test certificate.
Ready Stock, Fast Dispatch
1/2″ to 24″ NB flanges packed for immediate export.
Cupro Nickel Flanges Summary
- 1Flange Family: Weld Neck, Slip On, Blind, Lap Joint & Threaded
- 2Size Coverage: 1/2″ To 24″ NB, Class 150 To 2500
- 3Governing Standard: ASTM B151 / ASTM B122
- 4Dimension Standard: ASME B16.5, BS 10 & DIN 86037
- 5Common Alloys: Cu-Ni 90/10 (C70600) & Cu-Ni 70/30 (C71500)
- 6Service Use: Seawater, Desalination & Offshore Process Lines
Or call our Mumbai office: +91 22 6743 7134 • Cu-Ni flange batches dispatched with heat-wise MTC 3.1
Cu-Ni Flanges resist chloride attack better than most piping alloys. Seawater intake lines depend on this alloy for long service life. Desalination plants trust Cupro Nickel Flanges for scale-free, corrosion-free joints. Our Cun-Ni plate flanges hold tight tolerance across every pressure class. Marine engineers specify Cu-Ni 90/10 for ballast and cooling water systems. Every shipbuilders choose Cu-Ni 70/30 where higher strength is required. Every flange face is machined flat for a leak-tight gasket seat. Mill certificates accompany each shipment for full material traceability.
Mumbai · Copper-Nickel Piping Components Exporter
Cupro Nickel Flanges Manufacturer in India
Ganpat Industrial machines, tests and certifies Weld Neck, Slip On, Blind, Lap Joint, Threaded and Orifice Flanges in Copper Nickel 90/10 and 70/30 for engineers who cannot risk a flange face leaking under seawater pressure or desalination brine. Every Cupro Nickel Flanges Supplier in India claim we make is backed by heat-wise mill certification.
- ✓ISO 9001:2015
- ✓ASTM B151 & ASTM B122 Certified
- ✓ASME B16.5 Dimension Approved
- ✓Mill Test Certificate 3.1
- ✓Third-Party Inspection Approved
Explore ASTM A151 Cu-Ni Blind Flange Manufacturer in India Available in RF, FF & RTJ Facing Options
Cupro Nickel Flanges Specification
ASME B16.5 CUNI Flange Material
- UNS C70600 & C71500
- ASTM B151 / ASTM B122
- Cu-Ni 90/10 & 70/30
- Mill Certified Every Heat
Copper Nickel Flange Size Range
- NB: 1/2″ – 24″
- Class: 150 – 2500
- Type: RF, FF & RTJ Facing
- Custom Sizes On Drawing
Cu-Ni Flange Testing
- PMI Testing
- Hydrostatic Pressure Test
- Ultrasonic & Dye Penetrant Test
- Third-Party Inspection
Cupro Nickel Threaded Flange Finish
- Mirror Polished
- Matte / Shot-Blasted
- Natural Mill Finish
- Pickled & Passivated
Copper Nickel Plate Flanges Documentation
- Mill Test Certificate 3.1
- NABL Lab Report
- Packing List
- Certificate Of Origin
Copper Nickel Flanges Origin
- Indian Origin
- European Origin
- US Origin
- Heat-Number Traceable
Copper Nickel Lap Joint Flange Facing Options
Raised Face (RF)
Flat Face (FF)
Ring Type Joint (RTJ)
Male & Female Facing
Copper Nickel Plate Flanges Dimension & Weight Chart
| NPS Range | OD Range | Bolt Circle Dia. | Approx. Weight (WN) |
|---|---|---|---|
| 1/2″ – 2″ | 89 – 165mm | 60.5 – 127mm | 0.6 – 2.7 kg |
| 3″ – 6″ | 190 – 280mm | 152 – 241mm | 4.2 – 11.8 kg |
| 8″ – 12″ | 345 – 483mm | 298 – 431mm | 18.5 – 41 kg |
| 14″ – 24″ | 533 – 794mm | 476 – 724mm | 52 – 128 kg |
Weekly Delivery Of Cupro Nickel Flanges In Below Countries
We remain a trusted Cupro Nickel Flanges Supplier in India for refinery, marine and desalination projects.
| Export To | Continent | Shipping Time |
|---|---|---|
Bahrain |
Asia | 9 Days |
Peru |
South America | 45 Days |
Morocco |
Africa | 45 Days |
Algeria |
Africa | 45 Days |
Copper Nickel Flanges Grades We Supply
As a listed Cupro Nickel Flanges manufacturer in India, we stock every commercially used Cu-Ni grade.
Cu-Ni 90/10 (UNS C70600)
Cu-Ni 70/30 (UNS C71500)
CuNi10Fe1Mn (EN CW352H)
CuNi30Mn1Fe (EN CW354H)
C70620 (Cast 90/10 Variant)
C71640 (High-Fe 70/30 Variant)
Buy Nickel Copper Alloy Plate Flange in Class 150 to 2500 With Mirror & Matte Finish for Marine & Desalination Plants
Cu-Ni Flanges Pressure-Class Rating (150 To 2500)
Flange class is matched to the connecting pipe schedule and design condition per ASME B16.5.
| Class | Test Pressure | Working Pressure @ 38°C |
|---|---|---|
| Class 150 | 30 Bar | ~19 Bar |
| Class 300 | 77 Bar | ~50 Bar |
| Class 600 | 154 Bar | ~101 Bar |
| Class 900 & Above | 230+ Bar | On Request |
Need A Flange Rated For Your Exact Line Condition?Share design pressure & temperature – we confirm the correct class.
CUNI 90/10 Vs 70/30 Flange Comparison
Cu-Ni 90/10 Flange
- UNS C70600, cost-efficient seawater grade
- Good flow-induced corrosion resistance
- Preferred for ballast & cooling water lines
- Lower nickel content, moderate cost
Cu-Ni 70/30 Flange
- UNS C71500, higher strength & nickel content
- Superior resistance to erosion & impingement
- Preferred for high-velocity offshore piping
- Higher cost due to added nickel
Types Of Copper Nickel Flange We Manufacture
As an active flange source for marine, desalination and offshore fabricators, we stock every profile below.
Cu-Ni Spectacle Blind Flange
Spacer/Blank
ASTM B152 Slip On Flanges
SO
Cupro Nickel Orifice Flange
Flow Metering
Cuni Weld Neck Flange
WN
Nickel Cupro Threaded Flange
THD
Cu-Ni Ring Joint Flange
RTJ
Cunifer Socket Weld Flange
SW
Copper-Nickel Plate Flanges
Plate/Blind
Monthly Delivery Of Cupro Nickel Flanges In Below Countries
Every batch leaving our unit reflects our position as a leading Cupro Nickel Flanges Supplier in India.
| Export To | Continent | Shipping Time |
|---|---|---|
Oman |
Asia | 5 Days |
UAE |
Asia | 5 Days |
Italy |
Europe | 30 Days |
USA |
North America | 40-60 Days |
Need A Third-Party Witnessed Test Certificate?We coordinate SGS, Bureau Veritas or TUV inspection on request.
Surface Finish Options For Copper Nickel Flanges
Mirror Polished Finish
High-gloss face for hygienic & display duty
Pickled & Passivated
Acid treatment strips scale, cleans gasket seat
Matte / Bright Machined
Clean face for critical seawater flow lines
Shot Blasted Finish
Uniform texture ahead of dimensional inspection
Natural Mill Finish
Standard finish for economical fabrication lots
ASTM B152 Copper Nickel Plate Flanges Chemical Composition
Reference chemistry for Copper Nickel Flanges stock as per ASTM B151 / ASTM B122.
| Grade | Cu | Ni | Fe | Mn | Pb | S | Zn | C |
|---|---|---|---|---|---|---|---|---|
| Cu-Ni 90/10 (C70600) | Balance | 9.00 – 11.00 | 1.00 – 1.80 | 1.00 max | 0.05 max | 0.02 max | 1.00 max | 0.05 max |
| Cu-Ni 70/30 (C71500) | Balance | 29.00 – 33.00 | 0.40 – 1.00 | 1.00 max | 0.02 max | 0.02 max | 0.50 max | 0.05 max |
| CuNi10Fe1Mn | Balance | 9.00 – 11.00 | 1.00 – 1.60 | 0.50 – 1.00 | 0.02 max | 0.05 max | 0.50 max | – |
| CuNi30Mn1Fe | Balance | 29.00 – 32.00 | 0.40 – 0.70 | 0.50 – 1.50 | 0.02 max | 0.05 max | 0.50 max | – |
Need A Grade-Matched Chemistry Report?Share application media & velocity – we confirm the right alloy.
Cupro Nickel Threaded Flange Mechanical Properties
| Grade | Tensile Strength | Yield Strength (0.5% Ext.) | Elongation |
|---|---|---|---|
| Cu-Ni 90/10 (C70600) | Psi – 45,000 , MPa – 310 | Psi – 15,000 , MPa – 105 | 30 % |
| Cu-Ni 70/30 (C71500) | Psi – 60,000 , MPa – 415 | Psi – 25,000 , MPa – 170 | 35 % |
| CuNi10Fe1Mn | Psi – 47,000 , MPa – 325 | Psi – 17,000 , MPa – 115 | 32 % |
| CuNi30Mn1Fe | Psi – 63,000 , MPa – 435 | Psi – 27,000 , MPa – 185 | 36 % |
Copper Nickel Flanges Equivalent Material Standards
ASTM / UNS
- ASTM B151 / ASTM B122 Flange Stock
- UNS C70600, C71500
- ASME B16.5 Flange Dimension Standard
DIN / EN / Werkstoff Nr.
- CW352H (90/10), CW354H (70/30)
- Werkstoff 2.0872 / 2.0882
- DIN 86037 / EN 1092-3 Reference
BS / Trade Name
- BS 10 Table Flange Drilling Reference
- Cupro Nickel / Cunifer (Trade Names)
- Often Searched As CuNi Flange
Copper Flange HSN Code & GST Rate In India
HSN Code
7412
Copper alloy tube & pipe fittings heading
GST Rate
18%
Standard rate on copper alloy flanges
Export Scheme
LUT / IGST Refund
Zero-rated export under GST law
Origin Marking
Made In India
Stamped on every export consignment
Cupro Nickel Flanges Price List & Cost Factors
Bolt Circle & Drilling Dimension Chart
| NPS | No. Of Bolt Holes | Bolt Hole Dia. | Stud Bolt Size |
|---|---|---|---|
| 1″ | 4 | 15.7mm | 1/2″ |
| 4″ | 8 | 19.1mm | 5/8″ |
| 8″ | 8 | 22.4mm | 3/4″ |
| 16″ | 16 | 28.5mm | 1″ |
Need Drilling Confirmed Against Your Piping Drawing?Send NPS, class & facing – we confirm bolt-hole layout.
Corrosion Resistance Of Copper Nickel Flanges In Seawater
Seawater Corrosion Rate
<0.025 mm/yr
Cu-Ni 90/10, typical flowing seawater
Biofouling Resistance
Excellent
Copper ions suppress marine growth naturally
Erosion-Corrosion Limit
3.5-4.5 m/s
Safe flow velocity, Cu-Ni 90/10 piping
Pitting Resistance
High
Stable protective oxide film in chloride media
Copper-Nickel Socket Weld Commercial Flange Testing
Our facility operates as a certified Cupro Nickel Flanges manufacturer in India serving global buyers.
Chemical Analysis – Spectro Test
Spectrometer reading confirms Cu-Ni-Fe content against grade chemistry
Every Heat
Tensile & Yield Test
Confirms tensile and yield strength meet ASTM B151 minimums
Every Batch
Hydrostatic Test
Confirms flange integrity at 1.5 times design pressure
Every Batch
Dye Penetrant Test (DPT)
Detects surface cracks on machined flange face
On Request
Positive Material Identification (PMI)
Handheld alloy analyzer confirms grade before packing
Every Batch
Physical & Thermal Properties Of Nickel Copper Alloy Plate Flange
Density
8.9 g/cm³
Cu-Ni 90/10 / 70/30 reference density
Melting Range
1100-1150°C
Solidus to liquidus range
Thermal Conductivity
29-45 W/m·K
Higher than most nickel-alloy fittings
Corrosion Resistance
Excellent
Strong in seawater, brine & marine media
Comparing Grades For A Seawater Project?Send your flow velocity & media – we recommend the right alloy.
Manufacturing Process Of Copper Nickel Flanges
Raw Billet & Heat Selection
Certified copper-nickel billet chosen against grade chemistry
Forging & Ring Rolling
Hot forging to ASME B16.5 flange profile
CNC Facing & Drilling
Bolt-hole pattern and facing cut to buyer’s drawing
Stress Relieving
Controlled heat cycle stabilizes internal grain structure
Inspection, Marking & Packing
PMI, dimensional check and heat-number stamping before dispatch
Application Industries Of Cupro Nickel Flanges
Choose a Cupro Nickel Flanges Supplier in India, like us for standard and custom flange range.
Shipbuilding & Marine Piping
Desalination & Water Treatment Plants
Offshore Oil & Gas Platforms
Seawater Cooling & Ballast Systems
Power Plant Condenser Piping
Naval & Defense Vessel Systems
Chemical & Fertilizer Process Lines
Fish Farming & Aquaculture Piping
Packing & Export Documentation For Copper Nickel Flanges
We ship every order fully documented and export-ready across pressure classes and finish grades.
Wooden Crate / Carton Packing
Grade & Heat Number Tagging
Packing List, Invoice & COO
FCL / LCL Sea & Air Freight
Frequently Asked Questions
What is the price of Cupro Nickel Flanges?
Price depends on grade, class, size and finish; share drawing for exact quote.
What size range is available in Copper Nickel Flanges?
We supply flanges from 1/2″ up to 24″ NB in Class 150 to 2500.
Which HSN code applies to Copper Nickel Flanges in India?
Copper nickel flanges fall under HSN code 7412, taxed at 18% GST.
What is the difference between CUNI 90/10 and 70/30 flange?
90/10 suits standard seawater lines; 70/30 offers higher strength and velocity resistance.
Is there a minimum order quantity for Cunifer Socket Weld Flange?
No fixed MOQ; we supply single pieces and full project quantities on request.
Our Dealers and Distributors Are Present in the Locations Mentioned Below
| Texas (USA) | California (USA) |
| Al Jubail (Saudi Arabia) | Dubai (UAE) |
| Dammam (Saudi Arabia) | Abu Dhabi (UAE) |
| Riyadh (Saudi Arabia) | Houston (USA) |
| Al Khobar (Saudi Arabia) | Indiana (USA) |
6 Reasons to choose Ganpat Industrial Corporation
- Distributor of Heat Exchanger parts and Alloys for High Temperature applications.
- Stockholder and importer of Ferrous and non ferrous metals.
- Wide stock of prime quality austenitic and Ferritic Stainless Steel for Extreme pressure environment.
- Marine grade steel at lowest price in Mumbai.
- Compare Price per KG in India and China.
- Offer Resale price to local suppliers, traders and wholesalers in UAE, Saudi Arabia, Egypt, and USA