ThePipingMart Blog Grades C71500 Copper Nickel Alloy – Composition, Properties and Uses

C71500 Copper Nickel Alloy – Composition, Properties and Uses


Due to their excellent mechanical and physical properties, copper alloys have become increasingly popular in various industries. C71500 is a copper alloy widely used in applications that demand high strength and corrosion resistance. In this article, we will explore what c71500 is and discuss its composition, physical and mechanical properties, applications, hardness, heat treatment, welding, and corrosion resistance. If you’re looking to learn more about copper alloys, keep reading!

C71500 Composition

C71500, also known as copper-nickel alloy, is a wrought copper alloy primarily consisting of copper, nickel, and a small amount of iron. The proportion of copper in C71500 varies between 65% and 70%, nickel between 30% and 35%, and iron is present in small quantities of about 0.4%. C71500 also has trace amounts of manganese and silicon. Because of its nickel content, C71500 falls under nickel-copper alloys.

Element Content (%)
Copper, Cu 70
Nickel, Ni 30

C71500 Physical Properties

C71500 has a density of 8.94 grams per cubic centimetre, slightly higher than pure copper. It has an electrical conductivity of about 3% IACS (International Annealed Copper Standard). Its thermal conductivity is 40 W/m·K, lower than pure copper. C71500 exhibits excellent resistance to stress corrosion cracking and pitting corrosion.

Properties Metric Imperial
Density 8.94 g/cm3 0.323 lb/in3
Melting point 1171°C 2140°F

C71500 Mechanical Properties

C71500 has excellent tensile and yield strength. Its tensile strength ranges between 515 and 690 MPa, while its yield strength ranges between 195 and 415 MPa. It has a high elongation of more than 30% and a good hardness of about 120 HV. Its high strength and hardness make C71500 ideal for applications that require heavy loads and strong corrosion resistance.

Properties Metric Imperial
Tensile strength 372-517 MPa 54000-75000 psi
Yield strength (depending on temper) 88.0-483 MPa 12800-70100 psi
Elongation at break (in 381 mm) 45% 45%
Elastic modulus 117 GPa 17000 ksi
Poisson’s ratio 0.34 0.34
Machinability (UNS C36000 (free-cutting brass) = 100) 20 20
Shear modulus 57.0 GPa 8270 ksi

C71500 Thermal Properties

Properties Metric Imperial
Thermal expansion co-efficient (@20-300°C/68-572°F) 16.2 µm/m°C 9 µin/in°F
Thermal conductivity (@20°C/ 68°F ) 29 W/mK 201 BTU in/hr.ft².°F

C71500 Equivalents

ASME SB111 ASTM B111 ASTM B466 MIL C-15726
ASME SB171 ASTM B122 ASTM B543 MIL T-15005
ASME SB359 ASTM B151 ASTM B552 MIL T-16420
ASME SB395 ASTM B171 ASTM B608 MIL T-22214
ASME SB543 ASTM B432 DIN 2.0882

C71500 Uses

C71500 is widely used in marine and chemical processing industries. Its excellent corrosion resistance is ideal for seawater cooling systems and marine applications. Its high strength and hardness make it ideal for valve bodies, pump bodies, and other high-stress machinery parts. C71500 is also used in heat exchangers, condensers, and other applications that demand excellent heat transfer and resistance to fouling.

C71500 Hardness

C71500 has a good hardness of about 120 HV, higher than pure copper. Its high hardness makes it resistant to wear and deformation, making it ideal for high-stress applications.

C71500 Heat Treatment

C71500 does not require any heat treatment for strength enhancement. However, it can be annealed for stress relief and improved machinability. During annealing, the alloy is heated to a temperature between 620 and 760°C, cooled slowly in air or water, and then tempered at room temperature.

C71500 Welding

C71500 can be readily welded using various methods, including gas tungsten arc welding and gas metal arc welding. It is essential to clean the surface and use a suitable filler metal to prevent porosity and cracking.

C71500 Corrosion Resistance

C71500 exhibits excellent corrosion resistance, especially in seawater and other saline environments. It has good resistance to crevice corrosion, stress corrosion cracking, and pitting. Its corrosion resistance makes it suitable for marine applications, chemical processing industries, and oil and gas exploration.


C71500 is a versatile copper alloy that exhibits excellent mechanical and physical properties. Its high strength, hardness, and corrosion resistance make it an ideal material for various applications. We hope this article has provided helpful information about c71500, its composition, physical and mechanical properties, applications, hardness, heat treatment, welding, and corrosion resistance. If you’re looking for a reliable copper alloy for your next project, consider using C71500.

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