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Term referring to a batch of refined steel; a charged oxygen or electric furnace full of steel. A heat of steel can be used to cast several slabs, billets, or blooms.

Heat Treatment

Altering the properties of steel by subjecting it to a series of temperature changes. To increase the hardness, strength, or ductility of steel so that it is suitable for additional applications.

Heat-Affected Zone (HAZ)

The part of a metal that is not melted during cutting, brazing, or welding, but whose microstructure and physical properties are altered by these processes.

High Temperature Hydrogen Attack

A loss of strength and malleability of steel due to high temperature reactions of absorbed hydrogen with carbides in the steel, resulting in decarburisation and internal fissuring.

High-Carbon Steel

Steels that contain at least 0.3% carbon. If more carbon is added, the steel becomes less malleable and tougher to utilise. These steels are suitable for plow blades, bed springs, shovels, and other high wear applications.

High-Strength/Low-Alloy Steel

Steel that contains less than 5% hardening or strengthening alloys such as nickel, chromium, silicon, manganese, tungsten, molybdenum, and vanadium.

Hollow Structural Sections

A high-strength, cold-formed steel tubing used in used for structural purposes in a broad range of applications. Its biggest advantage is the high strength-to-weight ratio it possesses.

Hot Band (Hot-Rolled Steel)

Steel that has been rolled on a hot-strip mill. It can be sold directly to customers or further processed into other finished products.


A process in which a tube is placed in a forming die and is formed to the shape of the mold by internal water pressure. This process is ideal for automotive parts because it allows for major shape deformation and holes can be made in the tube almost anywhere.

Hydrogen Embrittlement

The absorption of hydrogen by a metal resulting in a loss of ductility.

Hydrogen Stress Cracking

Cracking of a metal resulting from the combination of hydrogen and tensile stress.

Hydrogen-Induced Cracking

Stepwise internal cracks that connect adjacent hydrogen blisters on different planes in the metal, or to the metal surface.

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