Cu-Ni 70/30 Pipes Manufacturer in India
Cu-Ni 70/30 Pipes Manufacturers in India
Stainless Steel Pipe Manufacturers is a leading Cu-Ni 70/30 Pipes Manufacturer in India, established in 2005 with 20+ years of experience in manufacturing and supplying industrial pipes and tubes. Our facility is near Mumbai, with an export office in Mumbai, and we supply customers across 85+ countries. Cu-Ni 70/30 pipes contain approximately 70% copper and 30% nickel, offering strong resistance to seawater corrosion, erosion, and biofouling in demanding marine and industrial environments.
We supply Cu-Ni 70/30 pipes in grades such as UNS C71500 and CuNi30Fe1Mn, with different sizes, wall thicknesses, lengths, and finishes according to the required specification. Products can be supplied to applicable ASTM, ASME, EN, and other international standards. Our quality systems include ISO 9001:2015, ISO 14001:2015, ISO 45001:2018, PED 2014/68/EU, and TÜV approvals. EN 10204 3.1 certification is supplied with every order, while 3.2 certification and third-party inspection can be arranged on request.
What Are Cu-Ni 70/30 Pipes?
Cu-Ni 70/30 pipes are pipes made from a copper-nickel alloy containing about 70% copper and 30% nickel. Small amounts of iron and manganese may also be added to improve strength and resistance to seawater erosion and corrosion. The higher nickel content gives Cu-Ni 70/30 better resistance to seawater, erosion, biofouling, and high-velocity flow compared with Cu-Ni 90/10. These pipes are commonly supplied in grades such as UNS C71500 and are available in seamless and welded forms according to the required specification.
Cu-Ni 70/30 Pipes
High-quality Cu-Ni 70/30 Pipes manufactured for demanding applications across marine, shipbuilding, desalination, offshore, chemical, power generation and engineering industries. Available in multiple sizes, wall thicknesses and specifications.
Types of Cu-Ni 70/30 Pipes
Our range as a Cu-Ni 70/30 Pipes Manufacturer covers different grades, pipe constructions, sizes, and end finishes for marine, seawater, heat-exchanger, condenser, and industrial applications.
- UNS C71500 Cu-Ni 70/30 Pipes: Standard 70/30 copper-nickel grade containing approximately 70% copper and 30% nickel.
- CuNi30Fe1Mn Pipes: Iron- and manganese-containing 70/30 alloy for demanding seawater and marine conditions.
- Seamless Cu-Ni 70/30 Pipes: Manufactured from solid alloy without a longitudinal weld.
- Welded Cu-Ni 70/30 Pipes: Produced from copper-nickel plate or strip and welded, particularly for larger diameters.
- Heat Exchanger Cu-Ni 70/30 Pipes: Used in condensers, coolers, and seawater heat-transfer equipment.
- Marine Cu-Ni 70/30 Pipes: Used for shipbuilding, offshore equipment, seawater circulation, and marine cooling systems.
- High-Velocity Service Pipes: Selected for seawater systems exposed to higher flow velocities and erosion conditions.
- Straight-Length Cu-Ni 70/30 Pipes: Supplied in specified lengths for fabrication and installation.
- Coiled Cu-Ni 70/30 Pipes: Suitable for selected small-diameter applications requiring continuous lengths.
- Plain-End and Bevelled-End Pipes: Supplied with suitable end preparation for joining and welding.
API 5L, ASTM A106 and ASTM A53 3LPE Coating Seamless Pipes Manufacturers and Suppliers in India
The applicable product standards for Cu-Ni 70/30 Pipes are different from carbon steel standards such as API 5L, ASTM A106, and ASTM A53. The main grade used is UNS C71500, a copper-nickel alloy containing approximately 70% copper and 30% nickel, with controlled iron and manganese additions that improve performance in seawater and marine environments.
For seamless Cu-Ni 70/30 pipes, ASTM B466 / ASME SB466 is commonly specified. It covers seamless copper-nickel pipe and tube and includes requirements for chemical composition, dimensions, mechanical properties, temper, and testing. For welded construction, ASTM B467 / ASME SB467 applies to welded copper-nickel pipe. Where the product is intended for condensers, coolers, or heat exchangers, ASTM B111 / ASME SB111 is commonly used for copper-nickel tubes and ferrules.
European projects may specify standards such as EN 12449 for seamless copper and copper-alloy tubes or EN 12451 for tubes used in heat exchangers and condensers. Marine projects may also specify relevant DIN requirements. The correct standard depends on the product form, dimensions, service conditions, manufacturing method, and project specification. For each order, the required UNS grade, standard, size, wall thickness, temper, testing, inspection, and material certification can be specified.
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Cu-Ni 70/30 Pipes Specification
| Property | Specification |
|---|---|
| Product | Cu-Ni 70/30 Pipes |
| Alloy | Copper-Nickel 70/30 |
| Common UNS Grade | C71500 |
| Copper | Remainder |
| Nickel | 29.0–33.0% |
| Iron | 0.40–1.0% |
| Manganese | Up to 1.0% under ASTM B466 |
| Manufacturing | Seamless or welded, depending on specification |
| Seamless Pipe Standard | ASTM B466 / ASME SB466 |
| Welded Pipe Standard | ASTM B467 / ASME SB467 |
| Condenser / Heat Exchanger Tube | ASTM B111 / ASME SB111 |
| Tempers under ASTM B466 | O60, H55, H80, HE80 |
| Typical Form | Straight lengths |
| Density | Approximately 8.94 g/cm³ |
The chemical limits and temper requirements above are based on ASTM B466 requirements for UNS C71500.
Cu-Ni 70/30 Pipes Standards and Specifications
| Standard | Product / Application |
|---|---|
| ASTM B466 / ASME SB466 | Seamless copper-nickel pipe and tube |
| ASTM B467 / ASME SB467 | Welded copper-nickel pipe |
| ASTM B111 / ASME SB111 | Condenser and heat-exchanger tubes |
| ASTM B543 / ASME SB543 | Welded copper-alloy heat-exchanger tube |
| EN 12449 | Copper and copper-alloy seamless round tubes |
| EN 12451 | Copper and copper-alloy tubes for heat exchangers and condensers |
| DIN 86019 | Copper-nickel pipe for marine applications |
| DIN 2.0882 | Material number associated with Cu-Ni 70/30 |
| CW354H | European copper-nickel designation used for 70/30 material |
The applicable standard depends on whether the requirement is for pipe, general engineering tube, or heat-exchanger/condenser tube. ASTM B466 specifically covers seamless C71500 pipe and tube, while ASTM B467 covers welded copper-nickel pipe.
Cu-Ni 70/30 Pipes Material and Grades
| Grade / Material | UNS | EN / Material Number | Typical Use |
|---|---|---|---|
| Cu-Ni 70/30 | C71500 | CW354H / 2.0882 | Seawater, marine and industrial piping |
| CuNi30Mn1Fe | C71500 equivalent family | CW354H / 2.0882 | Marine and seawater systems |
| Cu-Ni 70/30, weldable variant | C71520 | — | Products intended for subsequent welding where specified |
UNS C71500 is the principal 70/30 copper-nickel grade covered by ASTM B466. C71520 is a related composition intended for products that will subsequently be welded when specified.
What Is the Difference Between Cu-Ni 70/30 Pipes and Cu-Ni 90/10 Pipes?
Cu-Ni 70/30 contains substantially more nickel than Cu-Ni 90/10, giving it higher strength and making it particularly useful for demanding seawater and higher-velocity service. Cu-Ni 90/10 contains about 90% copper and 10% nickel, while Cu-Ni 70/30 contains about 70% copper and 30% nickel.
| Property | Cu-Ni 70/30 | Cu-Ni 90/10 |
|---|---|---|
| Common UNS grade | C71500 | C70600 |
| Nominal alloy | 70% Cu / 30% Ni | 90% Cu / 10% Ni |
| Nickel range under ASTM B466 | 29–33% | 9–11% |
| Iron range | 0.4–1.0% | 1.0–1.8% |
| Minimum tensile strength, O60 | 360 MPa | 260 MPa |
| Minimum yield strength, O60 | 125 MPa | 90 MPa |
| Typical advantage | Higher strength and demanding seawater service | Good seawater resistance with lower nickel content |
| Common service | Offshore, marine, high-velocity seawater | Marine, seawater, cooling-water systems |
The mechanical values shown are ASTM B466 minimum requirements for the O60 soft-annealed temper.
Cu-Ni 70/30 Pipes Chemical Composition
ASTM B466 UNS C71500 Chemical Composition
| Element | Composition |
|---|---|
| Copper (Cu) | Remainder |
| Nickel (Ni), including cobalt | 29.0–33.0% |
| Iron (Fe) | 0.40–1.0% |
| Manganese (Mn) | 1.0% max |
| Lead (Pb) | 0.05% max |
| Zinc (Zn) | 1.0% max |
| Carbon (C) | 0.05% max where specified |
| Other named elements | According to applicable standard |
Key Alloying Elements
| Element | Role in Cu-Ni 70/30 |
|---|---|
| Copper | Main base metal providing conductivity and corrosion resistance |
| Nickel | Improves strength and resistance to seawater corrosion |
| Iron | Helps improve resistance to erosion-corrosion in flowing seawater |
| Manganese | Supports alloy strength and seawater-service performance |
| Zinc | Controlled within the specification |
Cu-Ni 70/30 Pipes Mechanical Properties
ASTM B466 specifies mechanical requirements according to the temper. The following values are minimum requirements for UNS C71500 under the stated temper.
| Temper | Condition | Tensile Strength, Min. | Yield Strength at 0.5% Extension, Min. | Hardness |
|---|---|---|---|---|
| O60 | Soft annealed | 360 MPa | 125 MPa | 51 HR30T max |
| H55 | Light drawn | 275 MPa* | 205 MPa* | 41–65 HR30T* |
| H80 | Hard drawn | 485 MPa | 310 MPa | 70 HR30T min |
*The H55 values shown in the ASTM table apply to the applicable C71500 pipe/tube requirements and hardness provisions; exact product requirements should be taken from the ordered standard and size.
ASTM B466 also recognizes HE80 hard-drawn and end-annealed material as a standard temper. Mechanical requirements should be confirmed against the ordered product form and current specification.
Cu-Ni 70/30 Pipes Size and Weight Chart
Cu-Ni 70/30 pipe weight is calculated from the outside diameter, wall thickness, and alloy density. Using a density of 8.94 g/cm³, the theoretical weight formula is:
where OD and wall thickness are in millimetres. The figures below are theoretical weights calculated from nominal dimensions and are not shipping weights.
| NPS | DN | OD (mm) | Sch 40 Wall (mm) | Calculated Weight (kg/m) | Sch 80 Wall (mm) | Calculated Weight (kg/m) |
|---|---|---|---|---|---|---|
| 1/2" | 15 | 21.3 | 2.77 | 1.44 | 3.73 | 1.82 |
| 3/4" | 20 | 26.7 | 2.87 | 1.92 | 3.91 | 2.50 |
| 1" | 25 | 33.4 | 3.38 | 2.85 | 4.55 | 3.68 |
| 1-1/4" | 32 | 42.2 | 3.56 | 3.86 | 4.85 | 5.09 |
| 1-1/2" | 40 | 48.3 | 3.68 | 4.61 | 5.08 | 6.15 |
| 2" | 50 | 60.3 | 3.91 | 6.19 | 5.54 | 8.50 |
| 2-1/2" | 65 | 73.0 | 5.16 | 9.83 | 7.01 | 12.98 |
| 3" | 80 | 88.9 | 5.49 | 12.86 | 7.62 | 17.36 |
| 4" | 100 | 114.3 | 6.02 | 18.31 | 8.56 | 25.35 |
| 5" | 125 | 141.3 | 6.55 | 24.79 | 9.53 | 35.31 |
| 6" | 150 | 168.3 | 7.11 | 32.19 | 10.97 | 48.36 |
| 8" | 200 | 219.1 | 8.18 | 48.46 | 12.70 | 73.58 |
The OD and common schedule dimensions follow the standard NPS reference system. ASTM B466 also provides preferred wall thicknesses for drawn seamless pipe, so the final dimension should be ordered against the applicable product standard rather than treating every schedule as an ASTM B466 requirement.
Available Sizes, Dimensions and Schedules
Cu-Ni 70/30 pipes can be supplied in different nominal pipe sizes, outside diameters, wall thicknesses, schedules, and lengths. Common NPS sizes include 1/2", 3/4", 1", 1-1/4", 1-1/2", 2", 2-1/2", 3", 4", 5", 6", and 8", with larger sizes available according to the manufacturing route and specification.
| Size Group | Typical Options |
|---|---|
| Small bore | 1/8" to 2" NPS |
| Medium bore | 2-1/2" to 8" NPS |
| Large diameter | Available according to manufacturing method and specification |
| Wall thickness | Schedule-based or specification-specific |
| Length | Standard straight lengths, random lengths, or cut lengths |
| End finish | Plain, bevelled, or project-specific |
| Surface | Mill, cleaned, pickled, or specified finish |
Common Materials in Cu-Ni 70/30 Pipes
Our material range for Cu-Ni 70/30 Pipes includes the grades and related copper-nickel materials commonly specified for marine and seawater systems.
UNS C71500: The principal 70/30 copper-nickel pipe grade.
CW354H: European designation associated with Cu-Ni 70/30 material.
Werkstoff 2.0882: Material number commonly associated with Cu-Ni 70/30.
CuNi30Mn1Fe: European copper-nickel alloy designation used for 70/30 material.
UNS C71520: Related copper-nickel grade intended for subsequent welding when specified.
Copper-nickel welding consumables: Matching filler metals can be selected separately according to the welding procedure and base material.
Cu-Ni 70/30 Pipes We Manufacture and Supply
We manufacture and supply Cu-Ni 70/30 Pipes in seamless and welded forms, with the product condition selected according to the required standard and application. Seamless products can be supplied to ASTM B466, while welded pipe can be supplied to ASTM B467. For condenser and heat-exchanger requirements, ASTM B111 is the relevant tube specification.
| Product | Typical Specification / Form |
|---|---|
| Cu-Ni 70/30 Seamless Pipes | UNS C71500, ASTM B466 / ASME SB466 |
| Cu-Ni 70/30 Welded Pipes | UNS C71500, ASTM B467 / ASME SB467 |
| Cu-Ni 70/30 Condenser Tubes | ASTM B111 / ASME SB111 |
| Cu-Ni 70/30 Heat Exchanger Tubes | ASTM B111 / applicable tube specification |
| Annealed Pipes | O60 condition where specified |
| Light Drawn Pipes | H55 condition where specified |
| Hard Drawn Pipes | H80 condition where specified |
| Bevelled-End Pipes | End preparation according to joining requirement |
| Cut-Length Pipes | Supplied to specified project length |
Applications of Cu-Ni 70/30 Pipes
- Marine seawater piping
- Shipbuilding and shipboard cooling systems
- Offshore platforms
- Desalination plants
- Seawater intake and circulation systems
- Condensers and heat exchangers
- Power plant cooling-water systems
- High-velocity seawater lines
- Naval vessel piping
- Brine and cooling-water systems
- Chemical process cooling
- Offshore water systems
- Marine fire-water and service-water systems
Why Choose Us as Your Cu-Ni 70/30 Pipes Manufacturers in India?
With over two decades of experience in the pipes and tubes industry, we manufacture and supply Cu-Ni 70/30 Pipes for marine, seawater, offshore, desalination, power, heat-exchanger, and industrial requirements. Our product range covers UNS C71500 and related specifications in different sizes, wall thicknesses, lengths, tempers, and end finishes. Specific dimensions and product forms can be supplied according to the applicable project standard.
Our quality systems include ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018 certifications, along with PED 2014/68/EU and TÜV approvals. EN 10204 3.1 certification is supplied with every order, while 3.2 certification and third-party inspection can be arranged on request. Popular sizes may be available from ready stock, subject to availability. We also support specification-based requirements where the buyer needs a particular alloy condition, pipe dimension, temper, or inspection arrangement.
Our facility near Mumbai and export office in Mumbai support international orders to 85+ countries. As a Cu-Ni 70/30 Pipes Supplier in India, we coordinate material documentation, inspection requirements, export packing, and shipment arrangements according to the order and destination.
Countries We Export Cu-Ni 70/30 Pipes To
We are Cu-Ni 70/30 Pipes Suppliers serving customers across 85+ countries, with orders covering marine, offshore, desalination, power, heat-exchanger, and industrial piping projects. International orders can be handled according to the required material specification, inspection requirements, documentation, packing, and destination.
Middle East: UAE, Saudi Arabia, Qatar, Oman, Kuwait and Bahrain.
Europe: Germany, Italy, United Kingdom, Netherlands, France, Spain and Belgium.
Asia-Pacific: Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan and Australia.
North and South America: USA, Canada, Mexico and Brazil.
Africa: South Africa, Nigeria, Egypt and Kenya.
For overseas orders, EN 10204 3.1 certification is supplied with every order. EN 10204 3.2 certification and third-party inspection can be arranged when specified. Export packing and shipping documentation are handled according to the order and destination.
Cu-Ni 70/30 Pipes FAQs
Common questions about Cu-Ni 70/30 pipe grades, standards, tempers, seawater service, and supply.
Which grade is normally selected for Cu-Ni 70/30 pipes?
UNS C71500 is the main 70/30 copper-nickel grade used for pipe and tube products. The exact grade and temper should be selected according to the applicable product standard and service requirements.
Which standard covers seamless Cu-Ni 70/30 pipes?
ASTM B466 / ASME SB466 covers seamless copper-nickel pipe and tube, including UNS C71500. The standard covers straight-length products and defines applicable tempers and mechanical requirements.
Which standard is used for welded Cu-Ni 70/30 pipes?
ASTM B467 / ASME SB467 is used for welded copper-nickel pipe. The required grade, dimensions, testing, and welding condition should be stated in the purchase specification.
How do I select between Cu-Ni 70/30 and Cu-Ni 90/10?
Cu-Ni 70/30 is generally considered when higher strength and more demanding seawater or high-velocity service are important. Cu-Ni 90/10 may be sufficient for many conventional seawater systems. The choice should be based on velocity, temperature, water chemistry, pressure, fabrication method, and project specification.
Which temper should be selected for Cu-Ni 70/30 pipe?
O60 annealed provides a softer and more ductile condition. H55 light drawn provides greater stiffness, while H80 hard drawn provides substantially higher strength. ASTM B466 recognizes these tempers for the covered products.
Can Cu-Ni 70/30 pipes be welded?
Yes. Cu-Ni 70/30 can be fabricated and welded using suitable procedures and compatible consumables. Where the product is intended for subsequent welding, the material grade and condition should be specified when ordering.
Which sizes can be supplied?
Cu-Ni 70/30 pipes can be supplied in different NPS sizes, outside diameters, wall thicknesses, schedules, and lengths. Common pipe sizes range from small-bore dimensions through larger industrial sizes, subject to the selected manufacturing method and specification.
Can custom wall thicknesses and lengths be supplied?
Yes. Wall thickness and length can be specified according to the project requirement, subject to the applicable standard and manufacturing feasibility. Cut lengths can be supplied where specified.
How is Cu-Ni 70/30 pipe weight calculated?
For theoretical estimation, weight can be calculated using the alloy density of approximately 8.94 g/cm³:
Weight (kg/m) = (OD − Wall) × Wall × 0.02808
OD and wall thickness must be in millimetres. Actual delivered weight can vary because of dimensional tolerances.
Do you keep Cu-Ni 70/30 pipes in ready stock?
Popular sizes may be available from ready stock, subject to availability. Other sizes, grades, wall thicknesses, and project-specific requirements can be arranged according to the applicable specification.