Materials and Construction
Hardening of steel is not possible unless it is heated __________ critical point.

Between the first & second
Between the second & third
Above the highest
Above the lowest

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Materials and Construction
Nickel as a material of construction

Has a body centred cubic (bcc) crystal lattice structure
Is paramagnetic below 415° C (its Curie temperature)
Dimagnetic
Is used as an alloying element for both ferrous & non-ferrous alloys

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