T-1 Steel - This is steel with a higher yield strength and it is more difficult to form without cracking. HEIL uses this steel in flat plates mainly on the floors and tailgates of custom bodies. It has a minimum yield strength of 100,000 psi and an approximate Brinell hardness of 250-320.

Tandem Coating Line - A continuous coil coating line having two or more coating machines and curing or baking ovens in the line so it is capable of applying and curing two coats of paint in one pass through the line.

Tandem Mill - Arrangement of rolling mills, in direct line, allowing the metal to pass from one set of rolls to the next for the reduction of steel.

T-Bend 0-,1-,2-, etc. - A mechanical operation wherein a sheet sample is bent back upon itself with the inside bend radius specified in terms of the sheet thicknesses. Thus a 2-T Bend is a bend with an inside radius equivalent to two times the thickness of the metal sheet being tested.

Temper - The state of or condition of a metal as to its hardness or toughness produced by either thermal or heat treatment and quench or cold working or a combination of same in order to bring the metal to its specified consistency.

Temper Rolling - A light cold reduction of the sheet steel.  This operation is performed to improve flatness, eliminate discontinuous yielding and to obtain a uniform surface.

Tensile Strength - This is another value determined through actual destructive testing. This value indicates the point at which a material will fail when under a tensile load (being pulled from each end of the material). This value should not be confused with yield strength. In a dump body application, with high impact loads and highly abrasive payloads, yield strength and Brinell hardness are more important factors.

Tension Leveling - A mechanical operation wherein steel sheet, in coil form, is processed on a unit that stretches the product beyond its yield point to impart permanent deformation. The stretching operation assists to flatten the sheet. Tension leveling is considered the optimum process to achieve superior flatness characteristics.

Tint - A color modification resulting from the mixture of a white paint and colored paint such that the white is the predominant component and the resulting color is much less saturated that the pure color of the non-white pigment.

Tolerance - The specified permissible deviation from a specified nominal dimension, the permissible variation in the size of the part or the allowable variation in chemistry.

Tool Steel - Actually, any grade of steel that can be used for a tool. Generally the term tool steel as applied in the steel industry is a grade of steel characterized by high hardness                   and resistance to abrasion coupled in many instances with resistance to softening at elevated temperatures. These properties are attained with high carbon and high alloy                  contents and the steel is usually melted in electric furnaces to assure cleanliness and homogeneity of the product.

Toughness - The ability of a metal to absorb energy and deform plastically before fracturing. It is usually measured by the energy absorbed in a notch impact test such as the Charpy or Izod Impact Test. The area under the stress-strain curve in tensile testing is also a measure of toughness.

Tumbling - Cleaning articles by rotating them in a cylinder with cleaning materials.

Two-Coat System - The combination of a prime coat and a finish coat into a specified paint film. A typical 1 mil, two-coat system will have about 0.2 mil of primer coat and about 0.8 mil of finish coat.