Alloy 60 are mainly Made of Nickel and copper.
Alloy 30, CuNi 30, 30 Alloy, MWS-30, Cuprothal 30, HAI-30, Cu-Ni 2, Alloy 230, Nickel
Alloy 30
Alloy 60, CuNi 60, 60 Alloy, MWS-60, Cuprothal 60, Lohm, HAI-60, Cu-Ni 6, Alloy 260,
Nickel Alloy 60
Alloy 90, CuNi 90, Alloy 290, #95 Alloy, 90 Alloy, MWS-90, Cu-Ni 10, Cuprothal 90,
HAI-90, Cu-Ni 10, Alloy 260, Alloy 95, Nickel Alloy 90

Copper Nickel Alloys

Principally destined for the manufacturing of low temperatures electric resistances so as heating cables, shunts, resistances for automobile, they have a maximum operating temperature of 752°F.
They do not therefore intervene in the field of resistances for industrial furnaces.

Those are alloys of chemical composition copper + nickel with addition of manganese with a low resistivity

The most known, CuNi 44 (also called Constantan) presents the advantage of a very low temperature coefficient.

Their advantages are the following:

Very good resistance to corrosion
Very good malleability
Very good solderability