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
Wavy projections formed at the opera end of a cup or shell
in the course of deep drawing because of differences in directional
properties. Also termed scallop. (See Non-Scalloping Quality
Strip Steel)
Many types of edges can be produced in the manufacture of flat
rolled metal products. Over the years the following types of
edges have become recognized as standard in their respective
fields.
Slit, Slit and Edge Rolled, Sheared, Sawed, Machined or Drawn,
Mill Edge, Slit Edge or Sheared Edge.
No. 1 Edge - A smooth, uniform, round or square edge,
either slit or filed or slit and edge rolled as specified, width
tolerance +/-.005”.
No. 2 Edge - A natural round mill edge carried through
from the hot rolled band. Has not been slit, filed, or edge rolled.
Tolerances not closer than hot-rolled strip limits.
No. 3 Edge - Square, produced by slitting only. Not
filed. Width tolerance close.
No. 4 Edge - A round edge produced by edge rolling either
from a natural mill edge or from slit edge strip. Not as perfect
as No. 1 edge. Width tolerances liberal.
No. 5 Edge - An approximately square edge produced by
slitting and filing or slitting and rolling to remove burr.
No. 6 Edge - A square edge produced by square edge rolling,
generally from square edge hot-rolled occasionally from slit
strip. Width tolerances and finish not as exacting as No. 1 edge.
A method whereby the raw or slit edges of strip metal are passed
or drawn one or more times against a series of files, mounted
at various angles. This method may be used for deburring only
or filing to a specific contour including a completely rounded
edge.
Creases extending in from the edge of the temper rolled sheet.
(See Camber)
The dressing of metal strip edges by rolling, filing or drawing.
Maximum stress that a material will stand before permanent
deformation occurs.
Steel made in any furnace where heat is generated electrically,
almost always by arc. Because of relatively high cost, only tool
steels and other high-value steels are made by the electric furnace
process.
(Electrolytic Brightening) - An anodic treatment. A cleaning,
polishing, or oxidizing treatment in which the specimen or work
is made the anode in a suitable electrolyte; an inert metal is
used as cathode and a potential is applied.
Galvanizing by electrodeposition of zinc on steel.
(See Electrocleaning)
Black Plate that has been tin plated on both sides with commercially
pure tin by electrodeposition. (See Tin Plating)
The production of a thin coating of one metal on another by
electrodeposition. It is very extensively used in industry and
is continuing to enlarge its useful functions. Various plated
metals and combinations thereof are being used for different
purpose to illustrate:
1. Decoration and protection against corrosion…………………...copper,
nickel and chromium.
2. Protection against corrosion…………………………………...cadmium
or zinc
3. Protection against wear………………………………………..chromium
4. Build-up of a part or parts undersize…………………………...chromium
or nickel
5. Plate for rubber adhesion………………………………………brass
6. Protection against carburization and for brazing operations…......copper
and nickel
Increase in length which occurs before a metal is fractured,
when subjected to stress. This is usually expressed as a percentage
of the original length and is a measure of the ductility of the
metal.
Raising or indenting a design in relief on a sheet or strip
of metal by passing between rolls of desired pattern. (See Patterned
or Embossed Sheet)
Maximum alternating stress, which a given material will withstand
for an indefinite number of times, without causing fatigue failure.
Similar to the Olsen Test. Readings are in millimeters.
In metallography, the process of revealing structural details
by the preferential attack of reagents on a metal surface.
Steel representing the eutectoid composition of the iron carbon
system, with about 0.80% to 0.83% carbon, the eutectoid temperature
being about 1333°F. Such steel in the annealed condition
consists exclusively of pearlite. Steels with less than this
quota of carbon are known as hypo-eutectoid and contain free
ferrite in addition to the pearlite. When more carbon is present,
the steel is known as hyper-eutectoid and contains free cementite.
The presence of certain elements, such as nickel or chromium,
lowers the eutectoid carbon content.
Hardened and tempered, blue polished. Carbon content about
1.00, Chromium .17. Used for the expanders in oil piston rings.
Hardness 30 N 70 to 73. Range of sizes run for grooves 3/32” to ¼” wide
with the steel approximately .003% less than the grooves and
thickness from .012 to .020”.
An apparatus for indicating the deformation of metal while
it is subjected to stress.
The measurement of deformation during stressing in the elastic
range, permitting determination of elastic properties such as
proportional limit, proof stress, yield strength by the offset
method and so forth. Requires the use of special testing equipment
and testing procedures such as the use of an extensometer or
the plotting of a stress-strain diagram.
In brass mill terminology, Extra Hard is six B & S numbers
hard or 50.15% reduction from the previous annealing or soft
stage.
In brass mill terminology, Extra Spring is ten numbers hard
or 68.55% reduction in thickness from the previous annealing
or soft stage.
Shaping metal into a chosen continuous form by forcing it through
a die of appropriate shape.
|
