Materials and Construction
Silico-manganese steels (containing 0.7% Mn, 0.5% C and 2% Si)

Is tempered at 850°C
Do not have good resilience properties
Do not require heat treatment for any of its applications
Are used for leaf and coiled springs

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Materials and Construction
Chrome vanadium steels usually contain 0.8 to 1.1% Cr, 0.25 to 0.35% C and < 0.25% V.

Used for making axle & shafts of aeroplanes, automobiles and locomotives
Having poor fatigue resistance
Not helpful in producing cleaner steel due to oxidising action of vanadium
Having poor toughness

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Materials and Construction
Duriron is

All of these
Acid resistant, brittle and very hard
High silicon iron
Prone to breakage due to thermal expansion because of its very high co-efficient of thermal expansion

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