Glossary


A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Undercure (Blocking)
If the initial cure is carried out below that necessary for full
polymerization undercure may result in subsequent "blocking" or sticking of
coated sheets.
Underfill
A cross-section which has not filled up the roll pass, so that it is
inaccurate in both shape and dimensions.
Underpickling
Results when the steel has not had sufficient time in the pickling tanks to
become free of adherent scale and occurs when acid concentration, solution
temperatures and the line speed are not balance properly.
Unitemper Mill
It is used as one means for temper rolling or skin rolling of finished
cold-reduced strip. The mill consists of two stands of two-high mills, but
with the second stand above the first in the same mill housing, to provide
closer spacing between the two stands. Here, the strip can be elongated a
controlled amount between passes with only a very slight reduction in each
stand due to rolling.
Universal Mill
A combination of horizontal and vertical rolls, usually mounted in the same
roll stand. The mill is made up of two-high (and occasionally three-high)
horizontal rolls, with vertical roll sets on either or both sides of the
horizontal stand. The direction of the piece is reversed after each pass in
the mill.
Universal Rolling
Rolling in an universal mill provided with edging rolls for obtaining width
tolerance and better edges in plates and slabs.
Ultrasonic Test (Supersonic Test)
A versatile and highly-reliable non-destructive test for detecting and
locating internal defects such as cracks, cavities and unsoundness due to
discontinuities, by the application of high frequency sound waves. The
detecting instrument transmits such waves through the prepared surface of
the material under test and these waves are reflected back by internal
flaws.
Upend Forging
A forging produced in a closed dies so that the direction of the grain flow
is largely at right angles to the die faces.
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