Harden Ability - This relates to the ability of steel to harden deeply upon quenching and takes into consideration the size of the part, the method of quenching and the analysis and grain size of the steel. Carbon steels are considered as shallow hardening and various alloy and tool steel grades are considered deep hardening or through hardening.

Hardening - Increasing the hardness by suitable heat treatment, usually involving heating and cooling. When applicable, the following more specific terms should be used: age hardening, case hardening, flame hardening, induction hardening, precipitation hardening, and quench hardening.

Hardness - The ability of a metal to resist penetration. The principal methods of hardness determination are the Brinell, Rockwell and Scleroscope tests.

Heat Treatment - An operation or combination of operations involving the heating and cooling of a metal in the solid state for the purpose of obtaining certain desirable                 conditions or properties. Heat treating operations would be annealing, normalizing, quenching and tempering, etc.

High Strength - Product intended for applications where greater strength is critical.  High Strength typically begins at 35 ksi minimum yield strength.

High Strength Low Alloy (HSLA) - A specific group of steels in which the strength levels are achieved by the addition of moderate amounts of alloying elements.  The most common are columbium, vanadium or titanium.

Hi-Tensile Steel - This is the standard steel used by HEIL. We do not build a body using any steel less than this specification. It is a low alloy high strength metal with minimum yield strength of 45,000 psi and an approximate Brinell hardness of 150. This specification is very similar to ASTM A-570, Grade E.

Hot Rolled Sheet - Steel sheet that is processed to its final thickness by rolling at high temperatures on a specially designed hot-rolling facility.  Also commonly known as hot rolled unprocessed.

Hot Rolled Sheet Non-Temper Rolled - A U. S. Steel definition for product supplied as a coil directly off the Hot Strip Mill with no additional processing.

Hot Rolled Sheet Pickled - A U. S. Steel definition for a mill edge coil that is pickled, oiled and temper rolled with coil ends cropped back to meet gauge tolerances.

Hot Rolled Sheet Pickled Non-Temper Rolled - A U. S. Steel definition for a mill edge coil that is pickled and oiled with coil ends cropped back to meet gauge tolerances.

Hot Rolled Sheet Products - Flat steel products that are brought to final thickness by rolling through a Hot Strip Mill at high temperatures.