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 below the lower critical temperature and then cooled slowly
None of these
Heated up to the lower critical temperature and then cooled in still air

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Engineering Materials
Inconel contains

68% nickel, 29% copper and 3% other constituents
80% nickel, 14% chromium and 6% iron
80% nickel and 20% chromium
65% nickel, 15% chromium and 20% iron

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