DICTIONARY OF INDUSTRY TERMS

H

Hardenability - (Of steel.) The ability of a steel to harden when cooled from its hardening temperature, as measured by its surface hardness and by the depth of hardening below the surface.

Hardening - (As applied to heat treatment of steel.) Heating and quenching to produce increased hardness.

Heal Treatment - An operation or combination of operations involving the heating and cooling of steels in the solid state for the purpose of obtaining certain desirable mechanical, microstructural or corrosion-resisting properties.

Heat of Steel - The steel produced from one charge in the furnace, and consequently practically identical in its characteristics.

Heat Resisting Steels - Those steels which are used for service at relatively high temperatures because they retain much of their strength and resist oxidation under such condition.

Heat Tinting - Heating a polished specimen in air for the purpose of obtaining an oxidized surface.

High Draw - A drawing temperature not very much below the AC, point of the steel - used to develop high ductility when tempering steel after the quench.

High-Strength Steel - A specific class of low-alloy steels in which increased mechanical properties and, usually, good resistance to atmospheric corrosion are obtained with moderate amounts of one or more alloying elements other than carbon. Preferably called high-strength, low-alloy steels.

Hot Shortness - Brittleness in metal, at an elevated temperature.

Hot Working -The mechanical working of metal above the recrystallization temperature.

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