Copper Nickel Seamless Tubes Manufacturer in India
Copper Nickel Seamless Tubes Manufacturer in India
Sachiya Steel International is a leading Copper Nickel Seamless Tubes Manufacturer in India with over 20 years of experience in manufacturing, supplying, and exporting industrial tubes. We manufacture C70600 (90/10) and C71500 (70/30) Copper Nickel Seamless Tubes for marine, offshore, seawater, shipbuilding, heat exchanger, condenser, and engineering applications.
With a capacity of 100+ tons per month, we handle both standard and bulk requirements in different sizes, wall thicknesses, and specifications. Our experience across 85+ countries enables us to support international buyers with consistent quality, material traceability, inspection documentation, export packaging, and dependable delivery.
What Are Copper Nickel Seamless Tubes?
Copper Nickel Seamless Tubes are tubes with no weld seam, made from a copper alloy that carries 10% to 30% nickel plus iron and manganese. The tube is extruded or pierced from a billet, then drawn to its final OD and wall.
In seawater, the alloy builds a thin protective film that resists corrosion and erosion. Copper in the alloy also discourages barnacles and other marine growth, so tubes stay cleaner and heat transfer stays high. A tube is sized by outside diameter and wall thickness, and it is made to tighter tolerances than a pipe so it fits tubesheet holes. The two main alloys are 90/10 and 70/30, named for their copper-to-nickel split.
Copper Nickel Seamless Tubes
High-quality copper nickel seamless tubes manufactured for demanding applications across marine, chemical, petrochemical, power generation, oil and gas, construction and engineering industries. Available in multiple grades, sizes, wall thicknesses and manufacturing specifications.
Types of Copper Nickel Seamless Tubes
We manufacture and supply different types of Copper Nickel Seamless Tubes to meet the requirements of marine, seawater, offshore, heat exchanger, condenser, shipbuilding, and industrial applications. Available options include:
- 90/10 tubes (C70600): the standard condenser alloy, with 10% nickel and 1.0 to 1.8% iron.
- 70/30 tubes (C71500): 30% nickel, for warm, fast or polluted seawater.
- 70/30 tubes with higher iron and manganese (C71640): a strengthened alloy for demanding marine duty.
- Annealed tubes (O61): soft and ductile, easy to expand, flare and bend.
- Light-drawn tubes (H55): moderate strength, a common supply temper for exchanger tubes.
- Hard-drawn tubes (H80): the strongest temper, for straight runs with little forming.
- Straight tubes: cut to length for fixed and floating-head bundles.
- U-bend tubes: bent against your drawing for U-tube exchangers.
- Heat exchanger and condenser tubes: supplied to ASTM B111 for bundle use.
As an experienced Copper Nickel Seamless Tubes Manufacturer, we can supply these tube types in different grades, sizes, wall thicknesses, and specifications according to customer and project requirements.
C70600 (90/10), C71500 (70/30) and C71640 Copper Nickel Seamless Tubes Manufacturers and Suppliers in India
We manufacture and supply C70600 (90/10), C71500 (70/30), and C71640 Copper Nickel Seamless Tubes in different sizes, wall thicknesses, and tempers. Other copper-nickel alloys can also be quoted based on project requirements. Popular sizes may be available from stock, while non-standard sizes are produced to order.
For seawater condensers and coolers, C70600 (90/10) offers reliable service and cost-effective performance. C71500 (70/30) is suitable for warmer seawater, higher tube-side velocities, and polluted marine environments. C71640 is selected for demanding marine, naval, and offshore applications where the specification calls for this strengthened alloy. Share the water quality, tube-side velocity, operating conditions, required service life, and tube dimensions, and we can help identify the suitable copper-nickel alloy and wall thickness.
Types of Pipes & Tubes
Explore our range of industrial pipes and tubes, manufactured for different applications, materials, specifications and engineering requirements.
Pipes and Tubes
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Aluminium Pipes
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Carbon Steel Pipe
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Stainless Steel Pipe
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Alloy Steel Pipe
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Nickel Alloy Pipe
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Copper Nickel Alloy Pipe
→Get Certified Copper Nickel Seamless Tubes at Competitive Factory Prices
Copper Nickel Seamless Tubes Specification
The table sums up how we describe a Copper Nickel Seamless Tubes order.
| Item | Detail |
|---|---|
| Product | Copper Nickel Seamless Tubes |
| Method | Seamless, extruded or pierced, then drawn |
| Alloys | C70600 (90/10), C71500 (70/30), C71640 |
| Tube standards | ASTM B111 / ASME SB111, ASTM B466, ASTM B395 (U-bend), EN 12451 |
| Size basis | OD and wall in mm or inches, wall by minimum or average |
| Size range shown | OD 12.7 to 50.8 mm, other sizes on request |
| Tempers | Annealed (O61), light-drawn (H55), hard-drawn (H80) |
| Lengths | Fixed, random or cut length |
| Shapes | Straight tubes, or U-bend against a drawing |
| Surface | Bright, as-drawn or pickled |
| Tests | Chemical analysis, tensile, expansion test, hydrostatic or eddy current test |
| Certificate | EN 10204 3.1 with every order, 3.2 on request |
| Inspection | Third-party inspection on request |
Copper Nickel Seamless Tubes Standards and Specifications
Copper nickel tubes are bought to a tube standard, with a U-bend standard and a certificate type. The table shows how each is used.
| Standard | What it covers | Where it applies |
|---|---|---|
| ASTM B111 / ASME SB111 | Seamless copper and copper-alloy condenser and heat exchanger tubes | Core standard for exchanger tubes |
| ASTM B466 / ASME SB466 | Seamless copper-nickel pipe and tube | General tube and pipe use |
| ASTM B395 | U-bend seamless copper and copper-alloy heat exchanger and condenser tubes | U-tube bundles |
| ASTM B359 | Finned seamless copper and copper-alloy tubes | Finned exchanger tubes |
| EN 12451 | Seamless round copper and copper-alloy tubes for heat exchangers | European exchangers |
| EN 12449 | Seamless round copper and copper-alloy tubes for general use | European general tubes |
| TEMA | Standards for shell and tube heat exchangers | Tube sizes and fits |
| ASME Section VIII, Div. 1 | Pressure vessel design rules | Wall and allowable stress by your designer |
| EN 10204 | Types of inspection documents | 3.1 and 3.2 certificates |
Copper Nickel Seamless Tubes Material and Grades
The alloy sets the tube-side velocity limit and the cost. The table lists the main alloys. The velocities are typical design guides for seawater in tubes, and your designer sets the final figure.
| Alloy | UNS | EN designation | Werkstoff number | Nickel | Typical tube-side seawater velocity | Best for |
|---|---|---|---|---|---|---|
| 90/10 | C70600 | CuNi10Fe1Mn (CW352H) | 2.0872 | 9.0–11.0% | Up to about 2.5 m/s | Condensers, coolers, oil coolers |
| 70/30 | C71500 | CuNi30Mn1Fe (CW354H) | 2.0882 | 29.0–33.0% | Up to about 3.0 m/s | Warm, fast or polluted seawater |
| 70/30 (higher Fe and Mn) | C71640 | — | — | 29.0–32.0% | Up to about 3.0 m/s | Naval and offshore specifications |
What Is the Difference Between Copper Nickel Seamless Tubes and Copper Nickel Seamless Pipes?
The short answer: tubes are sized by outside diameter and wall, made to tight tolerances and used mainly to transfer heat. Pipes are sized by nominal pipe size and schedule and used to carry fluid. The alloy can be the same, but how you order, measure and test it differs.
| Question | Copper Nickel Seamless Tubes | Copper Nickel Seamless Pipes |
|---|---|---|
| How is it sized? | OD and wall in mm or BWG | NPS and schedule |
| How tight is the tolerance? | Tight | Looser |
| What is the main job? | Heat transfer in condensers and coolers | Carrying seawater in piping |
| Typical standard | ASTM B111, B395 | ASTM B466 |
| How thin is the wall? | Thin, often about 1 to 2 mm | Thicker, by schedule |
| Typical tempers | Annealed, light-drawn, hard-drawn | Annealed, drawn |
| Test focus | Expansion and eddy current, for tubesheet fit | Hydrostatic or eddy current |
| Best fit | Bundles and exchangers | Piping runs |
Copper Nickel Seamless Tubes Chemical Composition
Chemistry sets seawater resistance, and iron and manganese strengthen the protective film. The table shows the main elements for each alloy, with the role of each in the last column. Values are percentage by weight, maximum unless shown as a range.
| Element | C70600 (90/10) | C71500 (70/30) | C71640 | What it does |
|---|---|---|---|---|
| Copper (Cu) | Balance | Balance | Balance | Base metal, discourages fouling |
| Nickel (Ni, incl. Co) | 9.0–11.0 | 29.0–33.0 | 29.0–32.0 | Raises strength and seawater resistance |
| Iron (Fe) | 1.0–1.8 | 0.40–1.0 | 1.7–2.3 | Strengthens the protective film |
| Manganese (Mn) | 1.0 max | 1.0 max | 1.5–2.5 | Deoxidiser, helps the film |
| Zinc (Zn) | 1.0 max | 1.0 max | 0.50 max | Kept low |
Lead, sulphur, phosphorus and carbon are held to low limits in each alloy, because they hurt hot working and weldability.
Copper Nickel Seamless Tubes Mechanical Properties
Strength in copper nickel depends on temper, which is the amount of cold work the tube has had. Annealed tube is soft and easy to expand. Hard-drawn tube is stronger. The table summarises the tempers.
| Temper | Code | What it means | Typical use |
|---|---|---|---|
| Annealed | O61 | Soft and ductile | Tubes to be expanded, flared or bent |
| Light-drawn | H55 | Moderate strength | General exchanger and condenser tubes |
| Hard-drawn | H80 | High strength | Straight runs with little forming |
ASTM B111 and B466 set minimum tensile and yield strength by alloy and temper, and your certificate shows the figures for the temper supplied. For reference, annealed C70600 and C71500 seamless pipe and tube carry minimums of 275 and 360 MPa tensile and 105 and 125 MPa yield under ASTM B466. The next table gives typical physical properties.
| Property | C70600 (90/10) | C71500 (70/30) |
|---|---|---|
| Density | 8.94 g/cm³ | 8.94 g/cm³ |
| Melting range | 1100–1145°C | 1170–1240°C |
| Thermal conductivity | About 40 W/m·K | About 29 W/m·K |
| Modulus of elasticity | About 135 GPa | About 152 GPa |
Copper Nickel Seamless Tubes Size and Weight Chart
Weight depends on OD and wall thickness. Copper nickel has a density of about 8.94 g/cm³, so we use this formula:
OD and wall are in mm. Example: a 19.05 mm OD tube with a 1.2 mm wall weighs (19.05 − 1.2) × 1.2 × 0.02809 = 0.60 kg/m. All figures are in kg/m.
| OD (mm) | 0.9 mm wall | 1.2 mm wall | 1.5 mm wall | 2.0 mm wall | 2.5 mm wall |
|---|---|---|---|---|---|
| 12.7 | 0.30 | 0.39 | 0.47 | 0.60 | 0.72 |
| 15.88 | 0.38 | 0.49 | 0.61 | 0.78 | 0.94 |
| 19.05 | 0.46 | 0.60 | 0.74 | 0.96 | 1.16 |
| 22.0 | 0.53 | 0.70 | 0.86 | 1.12 | 1.37 |
| 25.4 | 0.62 | 0.82 | 1.01 | 1.31 | 1.61 |
| 28.6 | 0.70 | 0.92 | 1.14 | 1.49 | 1.83 |
| 31.75 | 0.78 | 1.03 | 1.27 | 1.67 | 2.05 |
| 38.1 | 0.94 | 1.24 | 1.54 | 2.03 | 2.50 |
| 44.5 | 1.10 | 1.46 | 1.81 | 2.39 | 2.95 |
| 50.8 | 1.26 | 1.67 | 2.08 | 2.74 | 3.39 |
Available Sizes, Dimensions and Tolerances
Copper Nickel Seamless Tubes are ordered by OD, wall and length. The chart above covers OD 12.7 to 50.8 mm, and other sizes can be quoted on request. ASTM B111 and EN 12451 set OD, wall and length tolerances by size and temper, and tubes can be ordered by minimum wall or by average wall. Exchanger makers also quote wall in BWG gauge, so the table maps common condenser sizes to gauge walls.
| OD (mm) | OD (in) | Common BWG options | Wall (mm) |
|---|---|---|---|
| 15.88 | 5/8" | 18, 16 | 1.24, 1.65 |
| 19.05 | 3/4" | 18, 16, 14 | 1.24, 1.65, 2.11 |
| 25.4 | 1" | 18, 16, 14 | 1.24, 1.65, 2.11 |
| 31.75 | 1-1/4" | 16, 14 | 1.65, 2.11 |
| 38.1 | 1-1/2" | 16, 14 | 1.65, 2.11 |
| 50.8 | 2" | 14, 12 | 2.11, 2.77 |
Tell us the OD tolerance, wall basis and length tolerance your tubesheet needs, and we will quote against them. Straightness and out-of-roundness matter in long bundles, so state any limits on the order.
Copper Nickel Seamless Tubes Common Materials
These are the materials most commonly requested from Copper Nickel Seamless Tubes Suppliers for marine, seawater, condenser, heat exchanger, naval, and offshore applications.
C70600 (90/10): Copper alloy with 10% nickel and 1.0–1.8% iron, commonly used for seawater condensers and heat exchangers.
C71500 (70/30): Copper alloy with 30% nickel, suitable for warm, fast-flowing, or polluted seawater service.
C71640: 70/30 copper-nickel with higher iron and manganese content, selected for demanding naval and offshore applications.
We supply these copper-nickel seamless tube materials in different sizes, wall thicknesses, and tempers according to project specifications.
Copper Nickel Seamless Tubes We Manufacture and Supply
We make Copper Nickel Seamless Tubes for the services below. The alloy and temper follow the duty.
| Service | Alloy | Temper and form |
|---|---|---|
| Seawater-cooled power and marine condensers | C70600, C71500 | Light-drawn or annealed, straight |
| Shell and tube coolers | C70600 | Light-drawn, straight or U-bend |
| Desalination evaporator and heater tubes | C70600, C71500 | Light-drawn, straight |
| Oil and lube coolers | C70600 | Annealed or light-drawn |
| Small-bore seawater lines | C70600, C71500 | Annealed |
Applications of Copper Nickel Seamless Tubes
- Power plants: Seawater-cooled condensers and auxiliary coolers on coastal stations.
- Shipbuilding and marine: Condensers, oil coolers, and small-bore seawater piping.
- Desalination plants: Evaporator, brine heater and condenser tubes.
- Offshore platforms: Seawater-cooled heat exchangers and utility coolers.
- Oil and gas: Produced-water and seawater coolers on decks and terminals.
- Chemical and petrochemical plants: Seawater-cooled process coolers.
- Pharmaceutical plants: Utility cooling water exchangers outside the product-contact zone.
- Coastal construction and EPC: Seawater heat exchangers and small-bore intake lines.
Why Choose Us as Your Copper Nickel Seamless Tubes Manufacturer in India?
With 20+ years of experience, we manufacture, supply, and export Copper Nickel Seamless Tubes for marine, seawater, offshore, shipbuilding, heat exchanger, and industrial applications. As a Copper Nickel Seamless Tubes Supplier in India, we support buyers with 100+ tons of monthly manufacturing and sourcing capacity, covering both standard and bulk requirements.
We supply C70600 (90/10), C71500 (70/30), and C71640 grades in different sizes, wall thicknesses, and tempers. Our team understands the key requirements of industrial buyers, including correct alloy selection, dimensional accuracy, tube quality, material traceability, certifications, and delivery schedules.
Copper Nickel Seamless Tubes can be supplied to applicable ASTM, ASME, ANSI, DIN, and ISO standards, with MTCs, inspection reports, and other documentation available as required. We serve customers across 85+ countries, supporting domestic and international orders with reliable export and supply coordination.
Countries We Export Copper Nickel Seamless Tubes To
We export Copper Nickel Seamless Tubes to buyers across major industrial markets, supporting marine, offshore, seawater, shipbuilding, heat exchanger, and engineering requirements.
Gulf and Middle East: UAE, Saudi Arabia, Qatar, Oman, Kuwait and Bahrain.
Europe: Germany, Italy, United Kingdom, Netherlands, France, Norway and Spain.
Southeast Asia and Oceania: Singapore, Malaysia, Indonesia, Thailand, Vietnam and Australia.
Africa: South Africa, Nigeria, Egypt and Kenya.
Americas: USA, Canada, Mexico and Brazil.
We also support international buyers looking for Copper Nickel Seamless Tubes Exporters, with required grades, sizes, wall thicknesses, certifications, documentation, and export packaging.
Copper Nickel Seamless Tubes FAQs
Common questions about copper nickel seamless tube alloys, tempers, seawater velocity, U-bends, testing, and supply.
Which alloy should I choose, 90/10 or 70/30?
Pick 90/10 for normal seawater service and cost-sensitive jobs. Pick 70/30 for warm water, faster tube-side flow, polluted harbours or critical duty.
What tube-side velocity can copper nickel tubes handle?
As a design guide, 90/10 handles seawater up to about 2.5 m/s and 70/30 up to about 3.0 m/s. Higher speeds can wear the protective film, so your designer should set the limit for the case.
How do I choose between annealed and light-drawn tubes?
Annealed tubes are soft and expand and bend easily, which suits U-bends and rolled joints. Light-drawn tubes are stronger and are the common supply temper for straight exchanger tubes.
Why do plants dose ferrous sulphate into the cooling water?
Iron dosing helps build a stable protective film on copper-nickel surfaces, so tubes resist corrosion and erosion for longer. Plants run it as part of a water treatment plan, which your operator defines.
Can copper nickel tubes be used with ammonia?
No. Ammonia and ammonia compounds can cause stress corrosion cracking in copper alloys. Choose another material for ammonia service.
Is copper nickel affected by polluted water?
Yes. Sulphides in polluted harbour water can damage the protective film. Clean seawater gives the best life, and flushing with clean water during shutdown helps.
How are the tubes joined to the tubesheet?
Tubes are usually expanded into the tubesheet holes, and sometimes seal welded as well. Use a qualified procedure and a compatible tubesheet material.
Can you supply U-bend tubes?
Send your drawing with the bend radius and leg length, and we will confirm what can be made and what temper applies. Straight tubes in standard sizes are the quickest to supply.
What tolerances apply to OD and wall?
ASTM B111 and EN 12451 set them by size and temper. Tell us your limits at enquiry, and we will quote against them.
What sizes can I order?
The chart above covers OD 12.7 to 50.8 mm in walls from 0.9 to 2.5 mm. Other sizes and walls can be quoted on request.
How do I calculate the weight of a tube order?
Use Weight (kg/m) = (OD − Wall) × Wall × 0.02809, with OD and wall in mm. Multiply by length and quantity. Real weight varies slightly with wall tolerance.
What affects the price of Copper Nickel Seamless Tubes?
Alloy is the biggest factor, since copper and nickel prices move the cost, and 70/30 costs more than 90/10. OD, wall, temper, length, U-bending, testing, inspection, quantity and freight also count.
Which certificates come with the tubes?
Each order carries an EN 10204 3.1 certificate showing chemistry and mechanical results. A 3.2 certificate and third-party inspection are available on request.
Is every tube tested before it ships?
ASTM B111 requires an eddy current test or a hydrostatic test on each tube. Tell us your preferred test when you enquire.
Are you a manufacturer or a supplier of Copper Nickel Seamless Tubes?
We are both. We manufacture near Mumbai and supply ready stock of popular sizes from the same location, subject to availability.
Do you export Copper Nickel Seamless Tubes, and how are they packed?
Yes. We ship to 85+ countries from our Mumbai export office, and we pack the tubes to suit sea or air freight and your project needs.