Engineering Materials
Permalloy is a

Polymer
Kind of stainless steel
Nickel and iron alloy having high permeability
None ferrous alloy

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Engineering Materials
In spheroidising process, the steel is

Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C
Heated up to the lower critical temperature and then cooled in still air
Heated below the lower critical temperature and then cooled slowly
None of these

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