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Materials and Construction

Materials and Construction
In the kraft (sulphate) process for the paper manufacture, the digestor is made of

Stainless steel
Karbate carbon
Cast iron
Wrought iron

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

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

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Materials and Construction
Presence of high amount of silicon in cast iron

Increases the contraction of the metal
Increases the formation of graphite
Suppresses the decomposition of Fe₃ C
Reduces its fluidity

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Materials and Construction
__________ can replace tungsten in high speed steel,

Cobalt
Molybdenum
Vanadium
Chromium

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Materials and Construction
Spark plugs are made of

Carborundum
Corundum
Metallic carbides
High alumina ceramic

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Materials and Construction
Work hardening of a material

Does not affect its ductility
Decreases its tensile strength
Increases its ductility
Decreases its ductility

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