Cupronickel Series

Cupronickel or copper-nickel (CuNi) is an alloy of copper that contains nickel and strengthening elements, such as iron and manganese. The copper content typically varies from 60 to 90 percent. (Monel is a nickel-copper alloy that contains a minimum of 52 percent nickel.)

Despite its high copper content, cupronickel is silver in colour. Cupronickel is highly resistant to corrosion by salt water, and is therefore used for piping, heat exchangers and condensers in seawater systems, as well as for marine hardware. It is sometimes used for the propellers, propeller shafts, and hulls of high-quality boats. Other uses include military equipment and chemical, petrochemical, and electrical industries.

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Grade list of copper and copper alloys by country
Classification	China	Germany	America	Japan	England	Europe	International
oxygen free copper	TU1	2.0076	C10200	C1020R	C103
	TU2	Cu-OF-H110	C11000	c1011	C101
	Vacuum oxygen free copper	E-Cu58	TU00	c1020	6N
	high purity	copper-OFE	c10500	c10700
Silver copper	TAg 0.1	CuAg 0.1	C10400	C1040		CuAg 0.1
brass	H90	CuZn10	C22000	C2200	CZ101	CuZn10	CW501L
	H70	CuZn30	C26000	C2600	CZ106	CuZn30	CW505L
	H68		C26200	C2620		CuZn33	CW506L
	H65	CuZn35	C27000	C2700	CZ107	CuZn36	CW507L
	H63	CuZn37	C27200	C2720	CZ108	CuZn37	CW508L
	H62	CuZn40	C28000	C2800	CZ109		CW509L
bronze	QSn4-0.3	CuSn4	C51100	C5111	PB101	CuSn4	CW450K
	QSn4-0.3	CuSn5	C51000	C5101		CuSn5	CW451K
	QSn6.5-0.1	CuSn6	C51900	C5191	PB103	CuSn6	CW452K
	QSn8-0.3	CuSn8	C52100	C5210		CuSn8	CW453K
	QSn6.5-0.4
copper-nickel	BZn18-18	CuNi18Zn20	C75200	C7521	NS106	CuNi18Zn20
	BZn18-26	CuNi18Zn27	C77000	C7701	NS107	CuNi18Zn27	CW410J
	BZn15-20		C7541		CW409J
	BZn18-10			C7350
pure copper	TU2	OF-Cu58	C10100	C1011	C101	CW008A	copper oxide
	T2	SW——copper	C11000	C1100	C101		copper - FRHC
	TP2	SF-Cu	C12200	C1220	C106	CW024A	copper - DHP
	TP1	SW-copper	C12000	C1201		CW023A	copper DLP

Properties of some Cu–Ni alloys
Alloy	Density g/cm³	Thermal conductivity W/(m·K)	TEC μm/(m·K)	Electrical resistivity μOhm·mm	Elastic modulus GPa	Yield strength MPa	Tensile strength MPa
90–10	8.9	40	17	19	135	105	275
70–30	8.95	29	16	34	152	125	360
66–30–2–2	8.86	25	15.5	50	156	170	435

UNS standard compositions* of wrought alloys (in at%). Maximum or range.
Alloy UNS No.	Common name	European spec	Ni	Fe	Mn	Cu
C70600	90–10	CuNi₁₀Fe	9–11	1–1.8	1	Balance
C71500	70–30	CuNi₃₀Fe	29–33	0.4–1.0	1	Balance
C71640	66–30–2–2		29–32	1.7–2.3	1.5–2.5	Balance

Marine engineering

Cupronickel alloys are used for marine applications due to their resistance to seawater corrosion, good fabricability, and their effectiveness in lowering macrofouling levels. Alloys ranging in composition from 90% Cu–10% Ni to 70% Cu–30% Ni are commonly specified in heat exchanger or condenser tubes in a wide variety of marine applications.

Coinage

The successful use of cupronickel in coinage is due to its corrosion resistance, electrical conductivity, durability, malleability, low allergy risk, ease of stamping, antimicrobial properties and recyclability.

Other usage

Single-core thermocouple cables use a single conductor pair of thermocouple conductors such as iron-constantan, copper constantan or nickel-chromium/nickel-aluminium. These have the heating element of constantan or nickel-chromium alloy within a sheath of copper, cupronickel or stainless steel.

Cupronickel is used in cryogenic applications. Its combination of good ductility retention and thermal conductivity at very low temperatures is advantageous for low-temperature processing and storage equipment as well as for heat exchangers at cryogenic plants.

For high-quality cylinder locks and locking systems, cylinder cores are made from wear-resistant cupronickel.