Alloy Designation	Cu (%)	Ni (%)	Fe (%)	Mn (%)	Other Elements
C71500	69.5 - 70	29 - 33	0.4 - 1	0.5 - 1.5	Trace amounts of C, Pb, S, P, Zn, etc., with total impurities usually less than 0.5%
C71640	Specific composition details may vary by standard, but generally has a significant Ni content for enhanced properties. Copper content is adjusted accordingly.	Higher Ni content compared to C71500 in some cases, aiming for specific performance characteristics.
C70400	86 - 89	9 - 11	0.5 - 1.5	0.5 - 1	Trace amounts of C, Pb, S, P, Zn, etc., with total impurities usually less than 0.5%

Property	C71500	C70400
Density (g/cm³)	Around 8.94	Approximately 8.9
Thermal Conductivity (W/(m·K))	Slightly lower than some copper - rich alloys, which is beneficial for heat transfer control in certain applications.	Good, but lower than pure copper
Electrical Conductivity	Good, but lower than pure copper	Good electrical conductivity, but lower than pure copper

Alloy Designation	Seawater Corrosion Resistance	Resistance to Chemical Media
C71500	Excellent. Forms a protective oxide film in seawater, suitable for severe seawater environments like high - salt, high - velocity flow areas.	Resistant to many organic compounds, salts, and diluted non - oxidizing acids. Reduced resistance in strong oxidizing acid environments.
C71640	Designed to have enhanced corrosion resistance in specific harsh environments, such as certain chemical process environments.
C70400	Good corrosion resistance in seawater and many common chemical media.

Alloy Designation	Applications
C71500	- Marine applications: seawater piping systems in ships, offshore platforms, desalination plants; marine hardware like propellers, shafts, hull components. - Industrial condensers and heat exchangers in power plants, refineries, chemical plants. - Evaporating equipment in food, beverage, and pharmaceutical industries.
C71640	- Specialized chemical processing equipment where resistance to specific corrosive agents is crucial. - High - end applications in electronics and high - tech manufacturing where precise material properties are required.
C70400	- General - purpose piping in various industries. - Some components in the automotive and electrical industries. - Also used in applications where corrosion resistance and formability are needed.

Comparison Aspect	C71500	C71640	C70400
Cost	Generally higher due to higher nickel content compared to C70400.		Relatively more cost - effective than C71500 in some cases due to lower nickel content.
Performance in Severe Conditions	Good performance in severe seawater and some chemical environments.	Designed for even more severe and specialized corrosive conditions.	Good performance in common corrosive environments, but may not be as suitable as C71500 or C71640 in extremely harsh conditions.
Formability	Can be processed by common metal processing methods.		Slightly better formability in some cases, easier to be processed into complex shapes.

Property	C71500	C71640	C70400
Tensile Strength (MPa)	Generally higher than some similar alloys, with a minimum tensile strength of around 380 MPa (annealed condition).	Higher tensile strength may be achieved depending on the specific composition and processing, often designed for high - stress applications.	Minimum 260 - 360 (depending on temper)
Yield Strength (MPa)	Higher than some comparable alloys, typically around 150 MPa (annealed condition).		Minimum 90 - 125 (depending on temper)
Elongation (%)	Usually around 30% or more, showing good ductility.		Minimum 30
Hardness	Slightly harder than some alloys in the same family, depending on temper.		Varies with temper, usually in a certain range

C71500/C71640/C70400 Nickel Copper Pipe for Industry

Basic Info.