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

Reduce machinability
Increase wear resistance
Increase hardenability
Increase endurance strength

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Engineering Materials
The temperature required for full annealing in hypereutectoid steel is

30° C to 50° C above lower critical temperature
30° C to 50° C below upper critical temperature
30° C to 50° C above upper critical temperature
30° C to 50° C below lower critical temperature

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