Technical Data

Metallurgical Terms

Hot Shortness.

Brittleness in metal at certain ranges above normal room temperature. It is manifested by loss in ductility and a liability to crack under stress at that particular temperature.

Hot Tear.

A crack formed in cast metal as a result of contraction at or just below the solidus. It is characterized by being comparatively wide and having blunt extremities.

Hot Top.

(See Feeder Head).

Hot Work.

The mechanical working, by rolling, forging or extruding, of a metal or alloy at a temperature above its recrystallization point. This temperature varies according to the composition of the material.

Hyper-Eutectoid Steel.

Steel with a carbon content higher than eutectoid composition. With appropriate heat treatment the typical structure is cementite and pearlite.

Hypo-Eutectoid Steel.

Steel with a carbon content lower than eutectoid composition. Typically in the annealed condition the structure is ferrite and pearlite.