Views: 10 Author: Site Editor Publish Time: 2025-04-17 Origin: Site
C71500 Copper Nickel Pipe is a 70/30 copper-nickel alloy — meaning it contains 70% copper and 30% nickel, with small additions of iron and manganese to improve strength and corrosion resistance.It’s one of the most corrosion-resistant Cu-Ni alloys, especially in seawater and marine environments.
Excellent Corrosion Resistance: This is the most significant advantage. C71500 exhibits outstanding resistance to corrosion, especially in seawater, brine, and other aggressive aqueous environments. It is highly resistant to:
General corrosion
Pitting
Crevice corrosion
Impingement attack (erosion-corrosion due to high-velocity fluids)
Stress corrosion cracking
Resistance to Biofouling: The nickel content helps to inhibit the attachment and growth of marine organisms (barnacles, algae, etc.), reducing maintenance and improving efficiency in marine applications.
Good Mechanical Properties:
Moderate to high strength
Excellent ductility and formability
Good weldability using various methods
Good creep resistance at elevated temperatures
Thermal Properties:
Good thermal conductivity (though lower than pure copper)
Low thermal expansion
Other Properties:
Good fabricability and machinability (rated around 20% of free-cutting brass)
Retains properties at cryogenic temperatures
Antimicrobial properties
C71500 is a copper nickel alloy known as 70/30 Copper-Nickel, meaning it contains approximately 70% copper and 30% nickel, along with small additions of iron and manganese to improve strength and corrosion resistance.
Copper Alloy | Copper | Nickel incl | Lead | Iron | Zinc, | Manganese |
max | ||||||
C71500 | remainder | 29.0 to 33.0 | 0.05 | 0.40 to 1.0 | 1.0 | 1.0 max |
Note:
A When the product is for subsequent welding applications, and so specified by the purchaser, zinc shall be 0.50 % max, lead 0.02 % max, and carbon 0.05 % max.
B Silicon 0.03 max, titanium 0.03 max.
Standard | Former | Copper Alloy | Tensile Strength, | Yield Strength,A | RockwellB |
060 | Soft annealC | C71500 &C71520 | 52(345) | 18(125) | 51 max |
Note:
A At 0.5 % extension under load.
B Rockwell hardness values shall apply only to tube or pipe having a wall thickness of 0.020 in. [0.5 mm] or over and an outside diameter of 5/16 in. [8 mm] or over. For all other tube no Rockwell hardness values shall apply. Rockwell hardness tests shall be made on the inside surface of the tube. When suitable equipment is not available for determining the specified Rockwell hardness, other Rockwell scales and values may be specified subject to agreement between the manufacturer and the purchaser.
C Although no minimum grain size is specified, the product must nevertheless have fully recrystallized grain structure.
Specifications | Details |
Specifications | ASTM SB 466 |
Size | 1/2" TO 6' IN OD & NB IN Various SWG & SCH |
Outer Diameter | 4.00 to 22.00 mm |
Wall Thickness | Between 0.15mm and 1.50 mm |
Length | Single Random, Double Random & Required Length |
Schedule | SCH20, SCH30, STD, SCH80, XS, SCH60, SCH120, SCH140, SCH160, XXS |
Form | Round Pipes/Tubes, Square Pipes/Tubes, Rectangular Pipe/Tubes, Coiled Tubes, “U” Shape, Pan Cake Coils, Hydraulic Tubes |
End | Plain End, Beveled End, Threaded |
Grades | Copper Nickel 90/10 (C70600), Cupro Nickel 70/30 (C71500), UNS C71640 |
C71500 copper-nickel pipe is often manufactured to various industry standards, including:
ASTM B466: Standard Specification for Seamless Copper-Nickel Pipe and Tube
ASME SB-466: ASME Boiler and Pressure Vessel Code, Section II, Materials
ASTM B111: Standard Specification for Copper and Copper-Alloy Seamless Condenser Tubes and Ferrule Stock (for heat exchanger applications)
Other international standards (e.g., DIN, EN) may also apply depending on the region and application.
It is recommended that wherever possible, product purchased to this specification be ordered to the diameters and wall thickness indicated in Table X1.1.
TABLE X1.1 Preferred Wall Thicknesses for Drawn Seamless Pipe Based on SPS Diameter | ||||||||
SPS | Outside Dia | Wall Thickness | ||||||
Specials | Regular | Extra Strong | ||||||
in.[mm] | in.[mm] | in.[mm | in.[mm] | in.[mm] | ||||
1/8 | 0.405[10.3] | 0.058 [1.47] | 0.062[1.57] | 0.100 [254] | ||||
1/4 | 0.540[13.7 | 0.065[1.65] | 0.072[1.83] | 0.082 [2.08] | 0.123 [3.12] | |||
3/8 | 0.675[17.1] | 0.065[1.65] | 0.072[1.83] | 0.095[2.41] | 0.148[3.76] | 0.090 [2.29] | 0.127 [3.23] | |
1/2 | 0.840 [21.3] | 0.065 [1.65] | 0.072[1.83] | 0.120 [3.03] | 0.203 [5.16] | 0.107 [2.72] | 0.149[3.78] | |
3/4 | 1.050 [26.7] | 0.065 [1.65] | 0.083[2.11] | 0.148 [3.76] | 0.238 [6.05] | 0.114 [2.90] | 0.157 [3.99] | |
1 | 1.315 [33.4] | 0.065 [1.65] | 0.095[241] | 0.203[5.16] | 0.340[8.64] | 0.126 [3.20] | 0.182 [4.62] | |
1 1/4 | 1.650 [42.4] | 0.072[1.83] | 0.095[241] | 0.120 [3.03] | 0.220 [5.59] | 0.380 [9.65] | 0.146 [3.71] | 0.194[4.93] |
1 1/2 | 1.900[48.3] | 0.072[1.83] | 0.109 [277] | 0.134 [3.40] | 0.250 [6.35] | 0.425[10.8] | 0.150 [3.81] | 0.203 [5.16] |
2 | 2.375 [60.3] | 0.083|2.11] | 0.120 [3.03] | 0.165 [4.19] | 0.340[8.64] | 0.520[13.2] | 0.156 [3.96] | 0.221 [5.61] |
2 1/2 | 2.875 [73.0] | 0.083 |2.11] | 0.134 [3.40] | 0203 [5.16] | 0.380 [9.65] | 0.187 [4.75] | 0.280 [7.11] | |
3 | 3.500[88.9] | 0.095[2.41] | 0.165[4.19] | 0.250[6.35] | 0458 [11.6] | 0.219[5.56] | 0.304[7.72] | |
3 1/2 | 4.000 [102] | 0.095[2.41] | 0.180[4.57] | 0284[7.21] | 0.250 [6.35] | 0.321 [8.15] | ||
4 | 4.500[114] | 0.109[2.77] | 0203 [5.16] | 0.340 [8.64] | 0.250 [6.35] | 0.341 [8.66] | ||
5 | 5.552[141] | 0.125[3.18] | 0.220[5.59] | 0.425 [10.8] | 0.250 [6.35] | 0.375 [9.52] | ||
6 | 6.625[168] | 0.134[3.40] | 0.259[6.58] | 0.457 [11.6] | 0.250 [6.35] | 0.437 [11.1] | ||
Marine Piping Systems
Seawater cooling systems
Ballast systems
Bilge and firefighting systems
Desalination plants
Shipboard HVAC and condensers
Heat Exchangers and Condensers
Offshore Oil & Gas Platforms
Industrial Applications
Chemical processing
Paper and pulp mills
Brine and slurry transport
1. Excellent Corrosion Resistance
2. Biofouling Resistance
3. Strong Yet Ductile
4. Good Thermal Conductivity
5. Good Resistance to Scaling
6. Long Lifespan in Harsh Conditions
7. Excellent Weldability and Fabrication
8. Low Maintenance
9. Resistance to Hydrogen Embrittlement
Feature | Copper-Nickel (Cu-Ni) | Stainless Steel (e.g., 316L) |
Seawater Corrosion Resistance | ⭐⭐⭐⭐⭐ Excellent (especially 70/30 alloy) | ⭐⭐⭐ Moderate to Good (susceptible to crevice corrosion) |
Biofouling Resistance | ⭐⭐⭐⭐ Natural antifouling, less marine growth | ⭐⭐ Needs coatings or treatments |
Thermal Conductivity | ⭐⭐⭐⭐ Good – ideal for heat exchangers | ⭐ Lower thermal conductivity |
Strength & Hardness | ⭐⭐ Moderate (tough, but softer than steel) | ⭐⭐⭐⭐ High mechanical strength |
Weldability | ⭐⭐⭐⭐ Very good | ⭐⭐⭐ Requires care to avoid heat-affected zone issues |
Maintenance | ⭐⭐⭐⭐ Low (resistant to scaling and buildup) | ⭐⭐⭐ Moderate – needs cleaning in marine applications |
✅ When Copper-Nickel is Better:
Marine environments (ships, offshore platforms, seawater piping)
Desalination plants
Systems exposed to seawater or brackish water
Heat exchangers needing corrosion and fouling resistance
Long-term performance with low maintenance
✅ When Stainless Steel is Better:
High pressure systems needing extra mechanical strength
Clean water systems
Hygienic environments (food processing, pharma)
General industrial use where seawater isn't involved
-Pipe and Tube (EN 10216-5, ASTM A213, ASTM A249, A312, A790,)
-Forged Fitting and Flange (ASTM A182 , ASTM A105,ASTM B564 )
-Butt Weld Fittings (ASTM A234, ASTM A403,ASTM A815)
-Round bar , Billet (ASTM A276, ASTM A479)
- Plate, Sheet, Strip(ASTM A240, EN 10028-7, A480)
-Bolting, Nuts（ASTM A193, A194, A320）
We Export C71500 Copper Nickel Pipe to Saudi Arabia, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Turkey, Egypt, Yemen , Syria, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Cambodia, Argentina, Bolivia, Brazil, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States Of America, Canada, Mexico, Panama, Jamaica, Bahamas, Denmark, Norway, Germany, France,Italy, United Kingdom, Spain, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Finland, Ireland, Croatia, Malta, Nigeria, Algeria, Angola, South Africa, Libya, Egypt, Sudan, Europe, Africa, Asia, North America, South America, Middle East.etc
Q: Are copper nickels valuable?
Copper-nickel (Cu-Ni) is highly valued in industry for its:
Corrosion resistance in seawater
Biofouling resistance
Strength and thermal conductivity
This makes it expensive compared to carbon steel and sometimes even pricier than some stainless steels, especially the higher nickel-content grades like CuNi 70/30.
Q: Why is copper not used in gas lines?
1. Corrosion Risk from Hydrogen Sulfide
Natural gas can contain hydrogen sulfide (H₂S) — a corrosive gas that reacts with copper.
This reaction forms copper sulfide, which can flake off, clog valves, or even create leaks over time.
2. Regulatory Restrictions
Many building codes and gas utilities prohibit or limit the use of copper for natural gas service.
Some places allow it only if the gas is certified as hydrogen sulfide–free.
3. Durability Concerns
Copper is relatively soft compared to steel and can be damaged more easily by mechanical impact.
