Patent ID: 7790295

Claim:
A composite material strip comprising a layer consisting of a copper multicomponent alloy permanently joined to a steel supporting layer, the copper multicomponent alloy comprising, in % by weight, 1.0 to 15.0% Ni, 2.0 to 12.0% Sn, 0.1 to 2.5% Mn, 0.1 to 1.5% Si and, optionally, at least one of Ti, Co, Cr, AI, Fe, Zn and Sb in an amount up to 1.5%, at least one of B, Zr, P and S in an amount up to 0.5% and Pb in an amount up to 25%, with the balance being Cu and inevitable impurities, wherein manganese-nickel silicides, which are in the range between the binary boundary phases Mn 5 Si 3 and Ni 2 Si, as hard intermetallic phases are formed in the copper multicomponent alloy and the composite material strip has undergone a combination of at least one solution anneal at 600 to 800° C. and at least one age-hardening treatment at 300 to 500° C. to match the material properties of the copper multicomponent alloy to the steel supporting layer.