|
Tack Welds |
Small scattered welds made to hold
parts of a weld in proper alignment while the final welds are being
made. |
|
Tail Mark |
A greatly enlarged roll mark whose
height or depth is very shallow. |
|
Tandem Mill |
Arrangement of rolling mills, in
direct line, allowing the metal to pass from one set of rolls into
the next. |
|
Tapping |
Transferring molten metal from
melting furnace to ladle. |
|
Tarnish |
Surface discoloration on a metal,
usually from a thin film of oxide or sulfide. |
|
Telescoping |
Transverse slipping of successive
layers of a coil so that the edge of the coil is conical rather than
flat. |
|
Temper |
The condition of an alloy produced by mechanical
and/or thermal treatment, and characterized by certain mechanical properties and
structure.
|
|
Tensile Strength (Also called
ultimate strength) |
Breaking strength of a material when
subjected to a tensile (stretching) force. Usually measured by
placing a standard test piece in the jaws of a tensile machine,
gradually separating the jaws, and measuring the stretching force
necessary to break the test piece. Tensile strength is commonly
expressed as pounds (or tons) per square inch of original cross
section. |
|
Texture |
In a polycrystalline aggregate, the
state of distribution of crystal orientations. In the usual sense,
it is synonymous with preferred orientation, in which the
distribution is not random. |
|
Thermocouple |
A device for measuring temperatures
by the use of two dissimilar metals in contact; the junction of
these metals gives rise to a measurable electrical potential with
changes in temperature. |
|
Tolerance |
Allowable deviation from a nominal or
specified dimension.
Close Tolerance:
A tolerance closer than "Standard".
Commercial Tolerance:
A term sometimes used synonymously with "Standard
Tolerance". The term "Standard Tolerance" is
preferred.
Published Tolerance:
A term sometimes used synonymously with "Standard
Tolerance". The term "Standard Tolerance" is
preferred.
Special Tolerance:
A tolerance other than "Standard".
Standard Tolerance:
An established tolerance for a particular class of product. This
term is preferred to "Commercial" or "Published"
tolerance.
Wide Tolerance:
A tolerance wider than "Standard". |
|
Tolerance Limit |
The permissible deviation from the desired value. |
|
Torsion |
A twisting action resulting in shear
stresses and strains. |
|
Toughness |
- Property of resisting fracture or
distortion. Usually measured by impact test, high impact values
indicating high toughness.
- Capacity of a metal to absorb
energy and deform plastically before fracturing.
- 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, but the
area under the stress-strain curve in tensile testing is also a
measure of toughness.
|
|
Trace |
Extremely small quantity of an
element, usually too small to determine quantitatively. |
|
Traffic Marks |
Abrasions resulting from relative
movement between contacting metal surfaces during transit. These
abrasions are usually dark in appearance due to the presence of
aluminum and aluminum oxide fines produced by the abrasive action. |
|
Transverse |
Literally, 'across', usually
signifying a direction or plane perpendicular to the direction of
working. |
|
Transverse Bow |
Curvature across the width of sheet
of foil. |
|
Transverse Direction |
A direction perpendicular to the
direction of working. |
|
Tread Sheet and Plate |
This product has a raised one-side
diamond embossed pattern imparted by mill rolls to provide improved
traction. It is often misidentified as "Tread Sheet",
belying the fact that it is commonly produced in plate thicknesses
also. For years, 6061 was the standard alloy for this product, but
several of the non-heat-treatable alloys are now also available in
this pattern. The latter, under the heading "Tread
Bright", find applications where aesthetics is more
important to the user than strength. |
|
Twist |
For rolled products, a winding
departure from flatness.
|
|
Two-Tone |
A sharp color demarcation in the
appearance of the metal due to a difference in the work roll
coating. |
