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Engineering Materials

Engineering Materials
The percentage of carbon in grey iron castings usually varies between

0.5 to 1%
0.012
5 to 7%
2.5 to 4.5%

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Engineering Materials
The portion of the blast furnace below its widest cross-section is called

Stack
Bosh
Throat
Hearth

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Engineering Materials
Gamma iron exits at following temperature

Room temperature
Near melting point
Between 1400°C and 1539°C
Between 910°C and 1400°C

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Engineering Materials
A small percentage of boron is added to steel in order to

Reduce machinability
Increase hardenability
Increase endurance strength
Increase wear resistance

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Engineering Materials
In nodular iron, graphite is in the form of

Free carbon
Cementite
Flakes
Spheroids

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Engineering Materials
The lower critical point for all steels is

723°C
600°C
913°C
700°C

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