Engineering Materials
When steel containing less than 0.8% carbon is cooled slowly from temperatures above or within the critical range, it consists of

Mainly pearlite
Pearlite and cementite
Mainly ferrite
Ferrite and pearlite

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Engineering Materials
In process annealing, the hypo eutectoid steel is

Heated below or closes to the lower critical temperature and then cooled slowly
Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace
Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium

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Engineering Materials
Dow metal contains

94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
90% magnesium and 9% aluminium with some copper
90% aluminium and 90% copper
92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg

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