Copper Nickel Fasteners

Copper Nickel Fasteners are available in two variations viz 70-30 (C70600) and 90-10( C71500 ) .C70600 Copper nickel is stronger as of the two with a yield strength of 150 Mpa in annealed condition as compared to 120 Mpa of C75100 Copper Nickel. Especially in case of cupro nickel 70-30 bolts as compared to copper nickel 70-10 bolts where tensile is the deciding factor due to high level of corrosion in marine applications. Torqbolt is a well known Copper Nickel Fasteners supplier in India.

Copper Nickel Alloys are well known worldwide with different trade names and unique numbers. Following chart shows the exact equivalent designations corresponding to the cross reference of copper nickel alloys.

Alloy	UNS No.	British Standard	En name	Werkstoff No.
CuNi 70/30	C71500	2871	CuNi30Fe	2.0882
CuNi 90/10	C70600	2871	CuNi10Fe	2.0872

Cupro nickel 90-10 consists of 90% copper and 10% nickel , which is less durable as compared to 70-30 alloys. This alloy is cheaper and easily available.

Copper Nickel 90-10	Cu	Fe	Pb	Mn	Ni	Zn
Min/max	Rem	1.0-1.8	0.05	1.00	9.0-11.0	1.00
Nominal	88.60	1.40	–	–	10.0	–

Notes: (1)Cu value includes Ag.
(2)Ni value includes Co.
(3)Cu + Sum of Named Elements, 99.5% min.

Alloy	Yield strength	Tensile strength	Elongation
	Min 0.2% Mpa	Min Mpa	Min %
Cupronickel 90-10	110-393	303-414	42

Alloy	Density	Elastic Modulus	Mean Coefficient of Thermal	Thermal Conductivity	Specific Heat
	(Kg/m3)	(Gpa)	Expansion(Î¼m/m/Â°C)	(W/m.K)	0-100Â°C
Cupronickel 90-10	8.94	140	17.1	45	377

CuproNickel 70-30 is a well-known alloy as compared to cupro nickel 90-10, with higher additions of nickel as compared to the lower alloy.

It has 70% copper and 30% nickel with a higher toughness and strength at hardened stages, Widely used due to superior properties.

Copper Nickel 70-30	Cu	Fe	Pb	Mn	Ni	Zn
Min/max	Rem	0.4-1.0	0.05	1.00	29.0-33.0	1.00
Nominal	69.50	0.50	–	–	30.0	–

Notes: (1)Cu value includes Ag.
(2)Ni value includes Co.
(3)Cu + Sum of Named Elements, 99.5% min.

Alloy	Yeild strength	Tensile strength	Elongation
Min 0.2% Mpa	Min Mpa	Min %
Cupronickel 70-30	88.0-483	372-517	45

Alloy	Density	Elastic Modulus	Mean Coefficient of Thermal	Thermal Conductivity	Melting Point
	(Kg/m3)	(Gpa)	Expansion(Î¼m/m/Â°C)	(W/m.K)	(nÎ©.m)
Cupronickel 70-30	8.94	117	16.2	29	1171

Marine Usage
Due to excellent resistance towards marine water corrosion, more than 90% it used in the marine industry with attachments of copper nickel flanges, pipes and fittings. Salt water flanged connections are very well protected with copper nickel bolts set with cupro nickel nut and washers. Propeller shafts, distiller tubes, ferrule fittings all are attached with cupro nickel screws with nuts as a pair.

Automotive Use
Copper nickel bolts are quite famous for automotive components like the steering tube and brake lines.

Fabrication
Copper Nickel Studs used for pressure vessels, heat exchangers, condenser plates, valve bodies and evaporators are very much in demand.

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Copper Nickel Fasteners