Machine Design
For hardening alloy steels and high speed steels, they are heated to

1300 to 1500°C
700 to 900°C
500 to 600°C
1100 to 1300°C

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Machine Design
The shear stress at a point in a shaft subjected to a torque is

Inversely proportional to the applied torque and the polar moment of inertia
Directly proportional to the applied torque and the polar moment of inertia
Directly proportional to the applied torque and inversely proportional to the polar moment of inertia
Directly proportional to the polar moment of inertia and to the distance of the point from the axis

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