Engineering Materials
The lower critical temperature

Is same for all steels
Increases as the carbon content in steel increases
Depends upon the rate of heating
Decreases as the carbon content in steel increases

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Engineering Materials
Dow metal contains

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

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