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Copper Nickel Pipes & Tubes

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Cupronickel or copper-nickel is an alloy of copper that contains nickel and strengthening elements, such as iron and manganese. Cupronickel is highly resistant to corrosion in seawater, because its electrode potential is adjusted to be neutral with regard to seawater. Because of this, it is used for piping, heat exchangers and condensers in seawater systems, as well as marine hardware, and sometimes for the propellers, crankshafts and hulls of premium tugboats, fishing boats and other working boats.
A more familiar common use is in silver-coloured modern circulation coins. A typical mix is 75% copper, 25% nickel, and a trace amount of manganese. In the past, true silver coins were debased with cupronickel. Despite high copper content, cupronickel is silver in colour.
Thermocouples and resistors whose resistance is stable across changes in temperature contain the 55% copper-45% nickel alloy constantan.
Monel metal is a nickel-copper alloy, containing a minimum of 63% nickel.

 

Key Properties
Properties vary with composition; however, some properties are outlined below:

  • Copper 90/10 and Copper 70/30
  • Outstanding resistance to corrosion, particularly sea water
  • 70/30 is stronger and has superior resistance to impingement corrosion
  • Good resistance to bio fouling, with the 90/10 alloy being slightly superior compared to the 70/30 alloy
  • Ductile
  • Can be hardened only by cold working
  • Good corrosion resistance
  • Good strength
Low temperature co-efficient of electrical resistance

Cupro Nickel 90/10 Tubes

Chemical COmposition 90/10

 

Standard Symbol
ASTM B 111 C 70600
BS 2871 Part 3 CN 102
EN 12451 CuNi10 Fe 1Mn
NFA51 102 CuNi10 Fe1Mn
JIS H 3300 C 7060
EEMUA Pub 144 1987 C7060X
NES 779 Part 3 90/10 CuNi
Guide to selection of tube materials
Sea Water
Dissolved salts from 1500 to 3000 ppm
Suspended solids more than 25 ppm
H2S or Ammonia less than 1 ppm
Permissible average velocity of water 3.0–4.0 meter / sec.
Product Applications areas
Chillers
Heat Exchangers & Condensers
Power Plants
Refineries
Desalination Plants
Ship Building & Ship Repairs
Defense

 

Curpo Nickel Tubes 95/5 & 90/10 for Marine Application
These Cupro Nickel tubes & pipes for Marine application are very important for all Industrial fields. The company has experience in these areas and is able to supply these tubes in accordance with most international standards and special customer requirements.

 

Cupro Nickel Tubes 90/10 for Heat Exchangers & Condensers

These Cupro Nickel tubes & pipes for Heat Exchangers & Condensers are very important for all Industrial fields. The company has experience in these areas and is able to supply these tubes in accordance with most international standards and special customer requirements.

 

Cupro Nickel Tubes 90/10 for Automobile Industries
The Move To Copper-Nickel Tubing
Copper had been proved since the early days to have many good attributes. It was easy to bend and had very high corrosion resistance, but there was concern about its low corrosion-fatigue strength. When copper-nickel was introduced, it displayed corrosion resistance similar to copper, higher general strength and better fatigue strength. Good formability allows ease of flaring and bending, and although the metal cost is greater than that of steel alternatives, copper-nickel is very attractive in view of its extra life, trouble-free installation and safety/reliability characteristics.

Properties of Copper-Nickel Brake Tubing
The copper-nickel alloy used for brake tubing typically contains 10% nickel, with iron and manganese additions of 1.4% and 0.8% respectively. The product conforms to ASTM B466 (American Society for Testing and Materials), which specifies dimensions, tensile strength and yield strength. Formability and internal cleanliness conform to specifications SAE J527, ASTM A254 and SMMT C5B (Society of Motor Manufacturers and Traders). Also, the alloy meets the requirements for pressure containment, fabrication and corrosion resistance for ISO 4038 (International Standards Organization) and SAE J1047.

 

Corrosion Resistance
For many years prior to its application as a brake tubing material, alloy C70600 had been used in ships, power station condensers and hydraulic lines on tankers, and had displayed excellent resistance to saline conditions. Early tests revealed that copper-nickel has almost the same resistance to burst pressure as steel. In testing, however, when exposed to salt spray over 180 days, steel's burst strength decreases significantly. The copper alloy remains consistently resistant.
For tubes covered with a moist, salty mudpack for six months, brazed steel was severely corroded resulting in perforation of the tubing wall; whereas, only superficial general corrosion was found on the copper-nickel tubing. ISO 4038 and SAE J1047 include a corrosion resistance requirement referring to ISO 3768 asking for a minimum burst pressure of 110 MPa after 96 hours in neutral salt spray. Swedish requirements include a resistance at least equal to 25µ of zinc. In all cases alloy C70600 easily exceeds the required corrosion resistance.

Copper-nickel brake tubing provides superior reliability and assures both manufacturers and vehicle owners improved durability for effective long-life functioning of the brake system.

 

Cupro Nickel Rods 90/10 and 95/5
Cupro Nickel Rods For 90/10

Chemical Properties
Pb 0.05 Max.
Fe 1.00 - 1.80
Mn 1.00 Max.
Zn 1.00 Max.
Cu + Ag Remainder Ni + Co 9.00 - 11.00

Mechenical Properties
Light Drawn
Flattening Test Reqd. (After 'O')
U.T.S. ksi 45.00 Min
Y.S. at 0.5% Ext. ksi 35.00 Min.
Expansion Test 30% at 60 degree Reqd. (After 'O')

Annealed Temper
Flattening Test Reqd.
Grain Size at 75 X mm Avg. 0.010 - 0.045
U.T.S. ksi 40.00 Min.
Y.S. at 0.5% Ext. ksi 15.00 Min.
Expansion Test 30% at 60 degree Reqd.
 
Cupro Nickel Rods For 95/5

Chemical Properties
Sn 0.10 Max.
Pb 0.05 Max
Ni 4.00 - 5.00
Fe 0.10 Max.
Mn 0.25 Max.
As 0.10 Max.
Cu + Ag 95.00 - 96.000
Sb 0.01 Max.
Bi 0.0025 Max.
Oxygen (O2) 0.08 Max.

Mechenical Properties
Annealed
U.T.S. MPa 216 - 275 (Strip cut from Ring Tube)
%Elongation at 5.65Sq.Rt So G.L. 40.00 Min. (Strip cut from Ring Tube)
Flattening Test Reqd.
Bend Test Reqd. (180 degree close)

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Cupro Nickel 70/30 Tubes

Chemical Composition 70/30

 

Standard Symbol
ASTM B 111 C 71500
BS 2871 part 3 CN 107
EN 12451 CuNi 30 Fe 1 Mn
NFA 51 102 CuNi 30 Fe 1 Mn
JIS H 3300 C 7150
Guide to selection of tube materials
Sea Water
Dissolved salts more than 10,000 ppm
Presence of abrasive suspended solids
Polluted with H2S and Ammonia
Permissible average velocity of water 3.0–4.0 meter / sec.
Product Applications areas
High capacity Power Plants
Ship Building & Ship Repairs
Heat Exchangers and Condensers
Distiller Tubes
Evaporators
Ferrules

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