Engineering Materials
Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio

50 : 20 : 20 : 10
50 : 20 : 10 : 20
40 : 30 : 20 : 10
30 : 20 : 30 : 20

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Engineering Materials
Steel contains

80% or more iron
50% or more iron
Alloying elements like chromium, tungsten nickel and copper
Elements like phosphorus, sulphur and silicon in varying quantities

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