Corrosion Resistance: Excellent resistance to corrosion, particularly in marine environments and against seawater.
Good Strength: Offers good tensile strength and durability, maintaining performance even at elevated temperatures.
Ductility: High ductility allows for easy shaping and forming into various components.
Thermal and Electrical Conductivity: Provides decent thermal and electrical conductivity, though lower than pure copper.

Applications

Marine Applications: Widely used in shipbuilding, offshore structures, and piping systems due to its corrosion resistance.
Heat Exchangers: Suitable for use in heat exchangers and condensers, where resistance to corrosion and good thermal conductivity are essential.
Electrical Components: Used in electrical connectors and components requiring reliable conductivity and durability.

Summary

C70318 is a copper-nickel alloy known for its excellent corrosion resistance, strength, and ductility, making it ideal for a variety of marine and industrial applications.

CHEMICAL COMPOSITION

	Ni%	Si%	Co%	Cu%	other
Nominal Composition				Bal.
Min	2.6	0.6	0.8
Max	3.4	1.2	1.2		0.5

PHYSICAL PROPERTIES

Density g/cm3	8.82
Conductivity at 20°C %IACS	50
Elastic Modulus GPa	130
Poisson's ratio	0.33
Thermal expansion coefficient 10-6/ K	17.6

MECHANICAL PROPERTIES

State	Yield strength	Tensile strength	Elongation	Hardness
	Mpa	MPa	A50%	HV
R690	≥680	690-830	≥6	≥200
R770	≥750	770-900	≥4	≥220
R840	≥810	840-970	≥1	≥240
R920	≥880	920-1060	≥1	≥260
R960	≥940	980-1120	≥1	≥280

Bending performance

Bending thickness: ≤0.5 mm, bending width: 10 mm

State	90° R/T		180° R/T
	GW	BW	GW	BW
R690	0	0	-	-
R770	0.5	0.5	-	-
R840	1.0	1.0	-	-
R920	1.0	1.0	-	-
R960	3.0	3.0	-	-

Alloy System	designation	UNS	EN	JIS	GB (China)
Cu	TK11000	C11000	Cu-ETP	C1100	T2
CuCr/Zr	TK15100	C15100	CuZr0.1	C1510	TZr0.1
	TK18160	C18160	CuCr0.5Zr	—
	TK18150	C18150	CuCr1Zr	—	TCr1-0.15
CuCrSiTi	TK18070	C18070	CuCrSiTi	—	TCr0.3-0.2- 0.05
CuNiSnCrTi	TK18090	—	—	—
CuNiP	TK19000	C19000	CuNi1P	—
CuTi	TK19920	C19920	—	—	—
CuFe	TK19210	C19210	CuFe0.1P	C1921	TFe0.1
CuFe	TK19400	C19400	CuFe2P	C1940	TFe2.5
CuNiSi	TK19005	C19005	—	—	—
	TK19010	C19010	CuNiSi	—	—
	TK70260	C70260	CuNi2Si	C7026	BSi2-0.45
	TK70250	C70250	CuNi3SiMg	C7025	BSi3.2-0.7
	TK70250HS	C70250	CuNi4SiMg	C7025	—
CuNiCoSi	TK70318	C70318	CuNi3CoSi	—	—
Special Brass	TK42300	C42300	CuZn10Sn1NiSi	—	—
Special Brass	TK42500	C42500	CuSn3Zn9	—	HSn88-2
CuSn / Bronze	TK14415	C14415	CuSn0.15	—	TSn0.12
	TK51000	C51000	CuSn5	C5102	QSn5-0.2
	TK51100*	C51100	CuSn4	C5111	QSn4-0.3
	TK51900*	C51900	CuSn6	C5191	QSn6-0.2
	TK52100*	C52100	CuSn8	C5210	QSn8-0.3

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