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Copper, Brass & Copper-Nickel Welded Tubes Manufacturer & Exporter — INOX STEEL INDIA

INOX STEEL INDIA is a trusted supplier of Copper, Brass and Copper-Nickel (Cu-Ni) Welded Tubes, engineered for marine service, desalination, HVAC, offshore platforms, heat exchangers, and power plant cooling systems.

Cu-Ni alloys — especially 90/10 and 70/30 — are world-standard materials used for seawater cooling, condensers, heat exchangers, brine systems and marine hardware due to their:

  • Exceptional seawater corrosion resistance
  • Anti-biofouling characteristics
  • High thermal conductivity
  • Superior erosion resistance
  • Long service life in chlorinated/flowing seawater

All tubes are produced as per ASTM B466 / B467, TIG-welded, bead-controlled, pickled, and tested for dimensional accuracy & corrosion performance.

Table of Contents

What Are Copper & Copper-Nickel Welded Tubes?

Copper-Nickel welded tubes are fabricated from copper-nickel alloy strip/plate, precision-formed into tubes and welded using TIG or Plasma welding. These alloys deliver:

  • Outstanding resistance to seawater corrosion
    Cu-Ni alloys form a protective oxide layer that resists Biofouling, Chlorides, Erosion-corrosion, and High-velocity seawater.
  • Superior thermal performance
    Ideal for heat exchangers, condensers & desalination units.
  • Long-term service reliability
    Stable under continuous seawater exposure (90/10) and high-velocity flows (70/30).
  • Excellent formability & weldability
    Perfect for complex tubing systems.

Grade Breakdown

Cu-Ni 90/10 (C70600)

90% Copper + 10% Nickel (with Fe & Mn)

  • Best general-purpose marine alloy
  • Excellent corrosion resistance in seawater
  • Natural anti-fouling behaviour
  • Ideal for condensers, coolers, marine systems

Perfect for:
Shipbuilding
Seawater pipelines
Firewater systems
Heat exchangers

Cu-Ni 70/30 (C71500)

70% Copper + 30% Nickel

  • Higher strength & higher corrosion resistance
  • Performs extremely well at high flow velocities
  • Better resistance to biofouling & erosion

Perfect for:
Offshore platforms
Subsea piping
Desalination plant evaporators
High-chloride brine heaters

What Are Copper & Copper-Nickel Welded Tubes?

Copper-Nickel welded tubes are fabricated from copper-nickel alloy strip/plate, precision-formed into tubes and welded using TIG or Plasma welding.

Key Performance Benefits

  • Outstanding resistance to seawater corrosion
  • Anti-biofouling behavior
  • High resistance to erosion-corrosion
  • Superior thermal conductivity
  • Excellent formability & weldability

How Cu-Ni Welded Tubes Are Manufactured

  1. Strip / Coil Selection (High-Purity Alloys): Alloys conform to ASTM B466/B467 chemistry.
  2. Tube Forming: Strip is roll-formed precisely into a tubular shape.
  3. Welding (TIG / Plasma): Produces a strong weld with minimal porosity, consistent bead, and high integrity.
  4. Bead Rolling / Smoothing: Internal/external bead reduced depending on requirement.
  5. Stress Relieving (Where Required): Ensures dimensional stability.
  6. Pickling & Passivation: Removes oxides and restores corrosion resistance.
  7. Testing: Hydrotest • Eddy Current • PMI • Dimensional • Mechanical.

Advantages of Copper-Nickel Welded Tubes

  • Best for Seawater & Marine Applications: Cu-Ni alloys naturally resist marine organisms, chloride attack and biofouling.
  • High Thermal Conductivity: Efficient heat transfer — ideal for condensers & heat exchangers.
  • Resistant to Biofouling & Mussel Attachment: Reducer cleaning frequency.
  • High Erosion-Corrosion Resistance: Excellent at high water velocities (especially 70/30).
  • Long Service Life: Lower maintenance costs for marine & offshore systems.
  • Easy Fabrication, Bending & Welding: Ideal for complex cooling systems.

Applications Across Industries

Marine & Shipbuilding

  • Seawater cooling lines
  • Ballast systems
  • Hull & seawater pipework

Desalination Plants

  • Brine heaters
  • Evaporators
  • Condenser tubing

HVAC & Refrigeration

  • Chiller tubes
  • Condensers
  • Heat pump systems

Cu-Ni 90/10 vs 70/30 — Quick Buyer Comparison

Parameter Cu-Ni 90/10 Cu-Ni 70/30
Seawater Corrosion ⭐⭐⭐⭐ ⭐⭐⭐⭐⭐
Erosion Resistance ⭐⭐⭐⭐ ⭐⭐⭐⭐⭐
Thermal Conductivity ⭐⭐⭐⭐⭐ ⭐⭐⭐⭐
Cost Lower Higher
Typical Use General marine High-velocity seawater, offshore

SIZE RANGE, OD/WT CHART & DIMENSIONAL CAPACITY

Standard Dimensional Range (Welded Cu-Ni / Brass / Copper Tubes)

Outside Diameter (OD) Wall Thickness (WT) Typical Applications
6 – 12.7 mm 0.7 – 1.2 mm HVAC coils, chiller lines, refrigeration
12.7 – 25.4 mm 0.7 – 2.0 mm Marine cooling lines, condensers
25.4 – 50.8 mm 1.0 – 3.0 mm Heat exchangers, oil & gas seawater piping
50.8 – 108 mm 1.2 – 5.0 mm Desalination, offshore firewater systems
108 – 219 mm 1.5 – 8.0 mm High-capacity seawater intake & brine systems

Available Lengths: ✔ 1m • 3m • 6m • 12m | ✔ Custom cut lengths for heat exchanger bundles.

CORROSION RESISTANCE MATRIX

Corrosive Environment Cu-Ni 90/10 Cu-Ni 70/30 Brass Copper
Seawater ⭐⭐⭐⭐ ⭐⭐⭐⭐⭐ ⭐⭐ ⭐
High-velocity seawater (>3 m/s) ⭐⭐ ⭐⭐⭐⭐⭐ ⭐ ⭐
Brine systems ⭐⭐⭐ ⭐⭐⭐⭐ ⭐ ⭐
Biofouling resistance ⭐⭐⭐⭐ ⭐⭐⭐⭐⭐ ⭐⭐ ⭐

THERMAL PERFORMANCE — KEY FOR HEAT EXCHANGERS

Material Thermal Conductivity (W/m·K) Heat Transfer Suitability
Copper 380–400 Excellent, highest heat transfer
Cu-Ni 90/10 40–60 Good, stable in seawater
Cu-Ni 70/30 25–40 Moderate, but superior corrosion resistance
Brass 105–120 Very good for HVAC

WELDABILITY, FILLER WIRE & WELD PROCEDURE

Welding Processes Used: TIG / GTAW, Plasma Welding, Automatic Welding.

Alloy Filler Metal AWS Code Notes
Cu-Ni 90/10 ERCuNi AWS A5.7 Matches 90/10 chemistry
Cu-Ni 70/30 ERCuNi70/30 AWS A5.7 Higher Ni for seawater velocity
Copper ERCu — High conductivity joints
Brass ERCuZn — Requires skilled welding for Zn control

MATERIAL SELECTION GUIDE

Application Requirement Recommended Alloy Reason
General seawater systems Cu-Ni 90/10 Balanced cost + corrosion
High-velocity seawater Cu-Ni 70/30 Highest erosion resistance
Desalination C71500 (70/30) Handles hot brine + chlorides
HVAC & refrigeration Brass / Copper High thermal conductivity

TESTING & QUALITY CONTROL

Standard Tests (ASTM B466/B467)

✔ Hydrostatic Test
✔ Eddy Current Test
✔ Visual & Dimensional
✔ Mechanical Tests (TS/YS/Elongation)

Optional Tests

✔ PMI (Positive Material Identification)
✔ IGC (Intergranular Corrosion)
✔ Ultrasonic Testing
✔ Radiography (RT)
✔ Flattening / Flaring
✔ Erichsen Cupping Test (for ductility)

Certifications Available

  • EN 10204 3.1
  • 3.2 (Third-party Inspection)
  • ASTM B466/B467 compliance reports

PRICE RANGE (2025 – INDICATIVE ONLY)

Alloy Welded Tube Price (INR/Kg) Welded Tube Price (USD/Kg)
Cu-Ni 90/10 (C70600) ₹ 950 – ₹ 1,450 $12 – $18
Cu-Ni 70/30 (C71500) ₹ 1,350 – ₹ 1,950 $17 – $24
Brass Tubes ₹ 600 – ₹ 900 $7 – $12
Copper Tubes ₹ 700 – ₹ 1,200 $8 – $15

Prices vary based on OD, WT, welding method, testing level & export requirements.

SURFACE FINISH OPTIONS

Finish Usage
Bright Annealed HVAC, refrigeration
Pickled & Passivated Marine & seawater
Light Polished Architectural
Cleaned & Degreased Heat exchangers, offshore

Why Choose INOX STEEL INDIA for Copper-Nickel, Brass & Copper Welded Tubes?

  1. Specialists in Marine & Seawater Tubing (Cu-Ni 90/10 & 70/30): We supply seawater-grade welded tubes used in offshore platforms, desalination, shipbuilding, and firewater networks with high resistance to seawater erosion and anti-biofouling properties.
  2. Precision TIG-Plasma Welded for Uniformity & Durability: Our weld process ensures low porosity, clean, smooth weld seams, and strong metallurgical bonding for saline environments.
  3. Conforms to ASTM B466 / B467 Standards: Every tube is manufactured & tested for correct chemical composition, mechanical properties, and dimensional tolerance.
  4. 100% PMI & Corrosion-Stable Performance: Mandatory PMI ensures correct alloying. All tubes undergo Hydro, Eddy current, and visual + dimensional checks.
  5. From Small OD HVAC Tubes to Large OD Marine Systems: Welded tubing from 6 mm to 219 mm OD for condensers, brine heaters, and seawater distribution lines.
  6. Export-Ready, Project-Approved, EPC-Friendly: Supplying to global EPC contractors in UAE, Qatar, Oman, Saudi Arabia, Europe, Singapore, South Korea, and Africa.

Supplier & Stockist — Pan-India & Global

Stock Locations: Mumbai • Ahmedabad • Chennai • Pune • Hyderabad • Delhi NCR • Bengaluru.

Export Supply: Marine-grade export supply to GCC, Europe & Asia. All shipments certified, tested & seaworthy.

Industries We Serve

Industry Why Cu-Ni/Brass/Copper is Preferred Grade Recommendation
Marine & Shipbuilding Anti-biofouling, seawater stability Cu-Ni 90/10
Offshore Oil & Gas High-strength + corrosion resistance Cu-Ni 70/30
Desalination Handles hot brine & high chlorides Cu-Ni 70/30
HVAC & Refrigeration High thermal conductivity Copper/Brass
Power Plants Efficient heat transfer in condensers Cu-Ni 90/10
Chemical Processing Stable in aggressive water chemistries Cu-Ni 70/30

 

Packaging & Export Handling

✔ Standard Packaging

  • Plastic end caps
  • Anti-corrosion paper wrapping
  • HDPE/LDPE protection
  • Bundled & strapped securely

✔ Export Packaging

  • Heat-treated wooden pallets/crates
  • VCI anti-corrosion film
  • Individually sleeved tubes for polished surfaces

✔ Documentation

  • EN 10204 3.1 / 3.2 certificates
  • PMI test reports
  • Hydro/EC test reports
  • ASTM B466/B467 compliance sheets
  • Dimensional & mechanical test results

Get Best Price for Cu-Ni 90/10 & 70/30 Welded Tubes

For Copper-Nickel, Brass & Copper Welded Tubes,

Inox Steel India

52-A, Mulji Thackersi Bldg, Islampura Street, Shop No. 10, Near Alankar Cinema, Mumbai – 400 004

Email

alloy@inoxsteelindia.in

Phone

+91 9930796690

FAQs

90/10 → General seawater

70/30 → High-velocity, aggressive seawater

Yes — Cu-Ni alloys naturally prevent algae, mussel & barnacle growth.

Yes — fully compliant with hydro, eddy current & PMI reports.

TIG/Plasma welding for strong, clean joints.

Yes — they offer excellent heat transfer + corrosion stability.

Yes — INOX STEEL INDIA exports to UAE, Saudi Arabia, Oman, Qatar, Europe & Africa.

Manufacturer & supplier of Copper-Nickel Welded Tubes in Cu-Ni 90/10 (C70600) and 70/30 (C71500). TIG/Plasma welded, seawater corrosion-resistant tubes for marine, offshore, desalination, HVAC & heat exchangers. ASTM B466/B467 certified. Exporter to GCC, Europe & Asia.

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