Your Address

9820454631 sales@steelemporium.co.in 4th Kumbharwada, Mumbai-400004

Call Us

9820454631

Copper Nickel 70/30 Pipes & Tubes

A high-performance 70-30 Copper-Nickel alloy (UNS C71500) - Engineered for extreme sea-water resistance and superior bio-fouling protection.

70/30 Copper Nickel Overview

Copper Nickel 70/30 (UNS C71500) is a 70% copper, 30% nickel alloy with additions of iron and manganese. These additions provide excellent resistance to erosion and corrosion in high-velocity seawater. Compared to the 90/10 alloy, the 70/30 Cu-Ni grade offers higher strength and better resistance to localized corrosion, even in stagnant or low-velocity waters. It is widely recognized for its inherent resistance to bio-fouling (marine growth) without the need for additional coatings. Steel Emporium provides high-quality 70/30 Copper Nickel pipes and tubes specifically for critical marine condensers and high-pressure subsea systems.

Key Material Advantages

Bio-Fouling Immunity

Inherent resistance to the attachment of barnacles and other marine organisms.

High Erosion Resistance

Designed to withstand high-velocity seawater flows in cooling systems.

Stress Crack Proof

Excellent resistance to stress corrosion cracking in saline environments.

Table 1: Chemical Composition (%)
GradeCuNiFeMnZnPbP
Cu-Ni 70/30 Balance 29.0 - 33.0 0.40 - 1.0 1.0 max 1.0 max 0.05 max 0.02 max
Table 2: Mechanical Properties (Soft Annealed)
PropertyMetric ValueImperial Value
Tensile Strength (min)345 MPa50,000 psi
Yield Strength (0.5% extension)125 MPa18,000 psi
Elongation (% in 50mm)35% min35% min
Hardness (Rockwell F)65 - 75 HRF-
Table 3: Physical Properties
PropertyValue
Density8.94 g/cm³ (0.323 lb/in³)
Melting Point1170 - 1240 °C (2140 - 2260 °F)
Thermal Conductivity (20°C)29 W/m·K
Specific Heat380 J/kg·K
Electrical Resistivity0.375 µΩ·m
Table 4: International Equivalent Standards
UNSDIN / Werkstoff No.EN DesignationJISCommon Name
C715002.0882 / 2.0872CuNi30Mn1FeC7150Copper Nickel 70/30
Table 5: Cu-Ni 70/30 Pipe Weight Chart (Kg/Mtr)
NB SizeOD (mm)SCH 10SCH 40SCH 80
1/2"21.341.431.812.36
1"33.402.333.624.75
2"60.334.406.088.36
3"88.907.5012.6017.00
4"114.3012.3518.0024.95
*Theoretical weights based on density 8.94 g/cm³.

Industrial Applications

Shipbuilding

Seawater piping, fire water systems & hulls.

Desalination

Distiller tubes and heat exchanger parts.

Power Generation

Steam turbine condensers & oil coolers.

Offshore Rigs

Splash zone cladding and hydraulic lines.

Chemical Process

Evaporators and salt production plants.

Coinage

High-value currency and mint applications.

Frequently Asked Questions

The primary difference is the Nickel content. 70/30 has 30% Nickel, which makes it stronger and more resistant to erosion and corrosion at higher water velocities compared to the 90/10 grade.

It is used because of its inherent resistance to bio-fouling and its ability to maintain a protective oxide layer that prevents corrosion even in rapidly flowing sea water.

No, Cu-Ni 70/30 is non-magnetic, which makes it ideal for use in submarine hulls and minesweeper vessels where magnetic signatures must be kept low.

Yes, it has excellent high-pressure performance, especially in seamless form. It is frequently used for high-pressure seawater distribution lines on naval ships.

The primary standards are ASTM B466 (Seamless Pipe), ASTM B467 (Welded Pipe), and ASTM B111/B171 for condenser tubes and plates.
Quick Specification
StandardASTM B466 / B467
UNS No.C71500
NB Sizes1/2" to 12" NB
ManufacturingSeamless / Welded
Certificates100% Traceable
AvailabilityReady Stock
Request Marine Quote