Copper Nickel Pipes & Tubes (CuNi 90/10, CuNi 70/30, CuNi 95/5)

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Product Overview

Om Export India Pvt Ltd is a premier manufacturer, supplier, and exporter of high-integrity Copper Nickel Pipes and Tubes (Cupronickel), specializing in CuNi 90/10 (C70600) and CuNi 70/30 (C71500) alloys. Engineered specifically to withstand severe marine and chemical environments, copper-nickel alloys provide exceptional resistance to seawater corrosion, biofouling, erosion-corrosion, stress corrosion cracking, and pitting.

Our Cu-Ni seamless tubes are produced from solid hot-extruded billets to ensure continuous grain structure, high dimensional precision, and structural strength under high pressure. We also manufacture ASME SB552 welded tubing, integrally finned heat exchanger tubes, and precision U-bend tubes conforming to EEMUA, ASTM, DIN, and BS specifications.

Copper Nickel 90/10 (C70600 / CuNi10Fe1Mn): The most widely utilized cupronickel grade, offering superior resistance to marine biofouling, excellent ductility, high fatigue strength, and good weldability for seawater piping and offshore cooling lines.
Copper Nickel 70/30 (C71500 / CuNi30Mn1Fe): Formulated with a 30% nickel content to provide enhanced resistance against high fluid velocities, localized impingement attack, oxidation, and elevated temperatures in heavy-duty naval and power plant condensers.
Copper Nickel 95/5 (C70400 / CuNi5Fe1): Cost-efficient alloy grade tailored for moderate marine cooling, automotive brake tubing, and intermediate industrial heat transfer equipment.

Key Features

Biofouling Resistance: Natural anti-fouling characteristics prevent marine organism attachment without external chemical treatment.
Erosion-Corrosion Resistance: Engineered iron and manganese additions form a protective oxide film resilient against turbulent flow.
Stress Corrosion Resistance: Virtually immune to chloride-induced stress corrosion cracking in extreme marine conditions.
Mechanical Ductility: Exceptional elongation (up to 55%) allowing for flaring, expanding, coiling, and U-bending.
Fabrication & Weldability: Readily weldable using TIG, MIG, and standard brazing techniques with matching filler wires.
Thermal Durability: Maintains structural stability across cryogenic conditions up to elevated operating temperatures.

Product Specifications

Specification Parameter	CuNi 90/10 (C70600)	CuNi 70/30 (C71500)	CuNi 95/5 (C70400)
Applicable Standards	ASTM B466, ASTM B111, BS 2871 Pt 3, IS 1545	ASTM B466, ASTM B111, BS 2871 Pt 3, IS 1545	ASTM B111, IS 1545, DIN 1785
Old BS / DIN Symbol	CN 102 / CuNi10Fe1Mn (2.0872)	CN 107 / CuNi30Mn1Fe (2.0882)	CN 101 / CuNi5Fe (2.0862)
Density	8.94 g/cm³	8.95 g/cm³	8.90 g/cm³
Melting Range	1100°C – 1145°C	1170°C – 1240°C	1085°C – 1100°C
Thermal Conductivity	45 W/m·K	29 W/m·K	60 W/m·K
Expansion Test (After 'O')	30% Expansion at 60° Cone Angle	30% Expansion at 60° Cone Angle	30% Expansion at 60° Cone Angle
Flattening Test	Satisfies ASTM B111 / B466 Requirements	Satisfies ASTM B111 / B466 Requirements	Satisfies ASTM B111 Requirements
Grain Size (Average at 75x)	0.010 – 0.045 mm	0.010 – 0.045 mm	0.010 – 0.045 mm

Dimensions & Sizes

Product Type	Outside Diameter (OD) / Nominal Size	Wall Thickness (WT) / Schedule	Length & Temper
Cu-Ni Seamless Pipes	1/2" NB to 16" NB (16 mm to 419 mm OD)	SCH 5S, SCH 10S, SCH 40S, SCH 80S, DIN 86019 Series	Up to 6000 mm / Single & Double Random
Cu-Ni Condenser & Heat Exchanger Tubes	4.00 mm to 22.00 mm OD (3/8" to 1-1/2" OD)	0.15 mm to 1.50 mm WT (16 BWG to 24 BWG)	Straight up to 12,000 mm (Annealed O61 / Light Drawn)
Welded Cu-Ni Pipes (ASME SB552)	2" NB to 36" NB (60.3 mm to 914 mm OD)	1.5 mm to 15.0 mm (SCH 5S to SCH 160)	Standard 6 Meter / Custom Cut Lengths
Cu-Ni Integrally Finned Tubes	12.70 mm to 25.40 mm Base Tube OD	19 to 28 Fins Per Inch (FPI), Fin Height 0.8 to 1.5 mm	Up to 8,000 mm Lengths
Cu-Ni U-Bend Condenser Tubes	12.70 mm to 31.75 mm OD	0.80 mm to 3.00 mm WT	Bending Radius 1.5 x OD up to 1250 mm R

Chemical Composition

Grade / Alloy	Cu (%)	Ni (%)	Fe (%)	Mn (%)	Zn (%)	Pb (%)	Sn (%)	P (%)
CuNi 90/10 (C70600)	Remainder (86.5–90.5)	9.0 – 11.0	1.0 – 1.8	1.00 Max	0.50 Max	0.02 Max	—	0.02 Max
CuNi 70/30 (C71500)	Remainder (65.0–70.0)	29.0 – 33.0	0.4 – 1.0	1.00 Max	0.50 Max	0.02 Max	—	0.02 Max
CuNi 95/5 (C70400)	Remainder (93.0–96.0)	4.8 – 6.2	1.3 – 1.7	0.3 – 0.8	1.00 Max	0.05 Max	0.10 Max	0.02 Max

Mechanical Properties

Grade & Temper	Tensile Strength (MPa / ksi)	Yield Strength 0.5% Ext. (MPa / ksi)	Elongation (% in 2 in.)	Fatigue Strength (10⁷ cycles, MPa)	Burst Pressure (MPa)
C70600 Annealed (O61)	275 – 370 MPa (40.0 Min ksi)	105 – 150 MPa (15.0 Min ksi)	35% – 55%	100 MPa (15.0 ksi)	130 MPa (19.0 ksi)
C70600 Light Drawn (H55)	310 – 415 MPa (45.0 Min ksi)	240 – 345 MPa (35.0 Min ksi)	15% – 25%	135 MPa (19.5 ksi)	150 MPa (21.8 ksi)
C71500 Annealed (O61)	360 – 450 MPa (52.0 Min ksi)	125 – 180 MPa (18.0 Min ksi)	30% – 45%	120 MPa (17.5 ksi)	160 MPa (23.2 ksi)
C71500 Light Drawn (H55)	415 – 550 MPa (60.0 Min ksi)	345 – 450 MPa (50.0 Min ksi)	12% – 20%	150 MPa (21.8 ksi)	185 MPa (26.8 ksi)
C70400 Annealed (O61)	260 – 340 MPa (38.0 Min ksi)	85 – 130 MPa (12.0 Min ksi)	35% – 50%	90 MPa (13.0 ksi)	115 MPa (16.7 ksi)

Standards & Specifications

Standard Designation	Governing Body	Scope & Application
ASTM B466 / B466M	ASTM International	Seamless Copper-Nickel Pipe and Tube (UNS C70600, C71500, C70400)
ASTM B111 / B111M	ASTM International	Seamless Copper and Copper-Alloy Condenser Tubes and Ferrule Stock
ASME SB552	ASME Boiler & Pressure Vessel	Welded Copper-Nickel Pipe and Heat Exchanger Tubes
ASTM B359 / B359M	ASTM International	Seamless Copper and Copper-Alloy Condenser and Heat Exchanger Tubes with Integral Fins
BS EN 12451 / BS 2871 Pt 3	British / European Standard	Seamless round tubes for heat exchangers and marine condensers (CN102, CN107)
EEMUA 144 / EEMUA 146	EEMUA	90/10 Cu-Ni piping systems for offshore and marine applications (Tubes & Flanges)
DIN 86019	German Standard (DIN)	Seamless CuNi10Fe1Mn tubes for marine and seawater pipeline systems
IS 1545	Bureau of Indian Standards	Cupro-nickel tubes for condensers and heat exchangers
JIS H3300	Japanese Industrial Standards	Copper and copper alloy seamless pipes and tubes (C7060, C7150)

Applications

Copper Nickel piping and tubing systems are used in critical marine, power, and process industries:

Marine & Shipbuilding: Seawater cooling systems, bilge and ballast piping, firewater mains, sanitary lines, and hull cladding.
Desalination Plants: Multistage Flash (MSF), Multiple Effect Distillation (MED), and Reverse Osmosis (RO) brine heater and evaporator tubes.
Power Generation: Steam turbine surface condensers, auxiliary cooling circuits, feed water heaters, and nuclear power heat rejection loops.
Offshore Oil & Gas: Platform splash zone protection, seawater injection lines, heat exchanger bundles, and riser piping.
Industrial Heat Transfer: Finned tubing for oil coolers, process gas condensers, refrigeration chillers, and chemical heat exchangers.
Plumbing & Effluent Systems: U-bend plumbing configurations preventing sewer gas backflow and sediment build-up.

Frequently Asked Questions

Q1: Why is Copper Nickel 90/10 widely used in seawater piping instead of stainless steel?
Copper Nickel 90/10 provides inherent resistance to macro-fouling (marine organisms such as barnacles and algae) and does not require biocides. It also exhibits high resistance to chloride stress corrosion cracking and pitting in stagnant seawater conditions.

Q2: When should CuNi 70/30 be selected over CuNi 90/10?
CuNi 70/30 is selected for operating environments with higher flow velocities (up to 4.5 m/s vs. 3.5 m/s for 90/10), elevated temperatures, higher operating pressures, and severe corrosive atmospheres.

Q3: What is the purpose of Copper Nickel Finned Tubes?
Cu-Ni finned tubes expand the external surface area of the tube, increasing thermal efficiency and heat transfer rates between internal process fluids and outer atmospheric or cooling media.

Q4: What certifications accompany Om Export India Pvt Ltd Copper Nickel pipes?
All shipments are accompanied by EN 10204 3.1 Inspection Certificates, detailing chemical analysis, tensile and elongation properties, 100% Eddy Current / Hydrostatic test results, and dimensional verification.