|A producer of intermediate products that does not also produce primary |
metal. For example, a rebar (see Reinforcing Bar) fabricator purchases
rebar and processes the material to the specifications of a particular
|A coating defect consisting of the condition in a colored coating where the |
color, either transparent or opaque, appears to get lighter or bleached
out. Heat, light, or chemical exposure usually causes fading.
|Fash (Top Fash, Top Flash, Burr Flash)|
|Sharp and ragged edges left after shearing or sawing.|
|A process to directly reduce iron ore to metallic iron pellets that can be |
fed into an electric arc furnace with an equal amount of scrap. This
process is designed to bypass the coke oven-blast furnace route to produce
hot metal from iron ore. It is also one of several methods that mini-mills
might use to reduce their dependence on high-quality scrap inputs (see
Direct Reduced Iron and Hot Briquetted Iron).
|The phenomenon leading to fracture under repeated or fluctuating stresses |
having a maximum value less than the ultimate tensile strength of the
material. Fatigue failure generally occurs at loads which applied
statically produce little perceptible effect. Fatigue fractures are
progressive, beginning as minute cracks that grow under the action of the
|Failure that occurs when a specimen undergoing fatigue completely fractures |
into two parts or has softened or been otherwise significantly reduced in
stiffness by thermal heating or cracking.
|A sharp reduction in gauge on the edge of a band which is caused by grooves |
worn in rolls due to extensive rolling of the same width material. This is
done for coating control on edge. The gauge variations on a feathered edge
generally does not extend in from the edge more than one inch.
|Feeder Head (Hot Top Sink Head)|
|A refractory lined receptacle, placed on the mould top or built into the |
ingot mould to reduce the shrinkage cavity (pipe) by keeping the metal in
liquid state longer at the top. This arrangement confines the shrinkage
cavity to the feeder head.
|A pipe through which water is forced into a boiler.|
|Any raw material.|
|A solid solution of one or more elements in body centred cubic iron. In |
plane carbon steels, the interstitial solid solutions of carbon in a - iron
|Ferrite Grain Size|
|The grain size of the ferritic matrix of a steel.|
|The process of producing a predominantly ferritic matrix in a ferrous alloy |
through an appropriate heat treatment.
|A metal product commonly used as a raw material feed in steel making, |
usually containing iron and other metals, to aid various stages of the
steel making process such as deoxidation, desulfurization, adding strength
or for introducing such elements in steel. Examples: ferrochrome,
ferromanganese, and ferrosilicon, silicon manganese etc.
|Metals that consist primarily of iron.|
|See Alloy Steel.|
|Repairing the furnace banks and bottom immediately after a heat is tapped.|
|A gray and amorphous fracture that results when a metal is sufficiently |
ductile for the crystals to elongate before fracture occurs. When a fibrous
fracture is obtained in an impact test, it may be regarded as definite
evidence of toughness of the metal.
|(1) In forgings, a structure revealed as laminations, not necessarily |
detremental on an etched section of or as a ropy appearance on a fracture
(2) In wrought iron, a structure consisting of slag fibers embedded in
(3) In rolled steel plate stocks, a uniform lamination free fine-grained
structure on a fracture surface.
|Hardness as determined by the use of a file of standardized hardness on the |
assumption that a material that cannot be cut with the file is as hard as,
or harder than, the file. Files covering a range of hardness may be
|Fin (Overfill, Flash)|
|Solidified metallic strip projecting out at right angles from ingot surface |
and caused by seepage of liquid metal through a longitudinal crack in the
mould, or in the mould joint in case of split mould. Or, a protruding rib
of metal running longitudinally along a rolled product, as results from
overfilling a pass.
|Fin Crack (Longitudinal Crack)|
|Crack in the ingot associated with the formation of fin and the resulting |
obstruction during contraction while cooling.
|The surface appearance of steel after final treatment.|
|The texture of the steel surface which is determined by the grit on the |
rolls (See Shot Blast Roll Finish) or by the grind on the rolls in the case
of bright finish (See Ground Roll Finish).
|The portion of the steel making complex that processes semi-finished steel |
(slabs or billets) into forms that can be used by others. Finishing
operations can include rolling mills, pickle lines, tandem mills, annealing
facilities, and temper mills.
|Finishing additions of ferro-alloys, deoxidizers and/or carburizers (for |
example, coke) which are made to liquid steel, usually in ladle, and at
times, partly in the furnace, so as to bring the liquid steel to the
|The last stand in a rolling mill, which determines the surface finish and |
|The temperature at which hot mechanical working of metal is completed.|
|A refractory material, essentially hydrated aluminium silicate in |
composition, having a high fusion point used in the manufacture of
refractory bricks or mortar.
|An irregular pattern of lines on the surface of a sheet caused by rolling |
with a fire cracked roll. Fire cracks will develop when a roll is not
|A coating defect consisting of the undissolved particles in the coating |
usually surrounded by a circular crater. The particles are usually resinous
and are raised up from the cured surface with the appearance of the eye of
|The V-shaped cavity which may develop on the tail-end of the strip from the |
hot strip mill.
|Small, discontinuous, internal ruptures attributed to stresses produced by |
localized transformation and hydrogen-solubility effects during cooling
after hot working that usually occur some distance away from the end of a
piece and often midway from the surface to the center of a section. In
fracture surfaces, flakes appear as bright, silvery areas with a coarse
texture. In deep acid-etched transverse sections, they appear as
discontinuities. It is generally considered that hydrogen dissolved in the
molten steel makes it more susceptible to flakes and that proper
retardation of cooling from forging or rolling temperatures effectively
will prevent their formation. Also termed hairline cracks and shatter
|A defect made by contact rolls when an arc is passed through the strip. |
Generally on lighter baseweight. (DR coils)
|A coating defect consisting of the uneven, random distribution of a coating |
on coated substrate. A variation in the color of a coating which is due to
variations of the film weight. A coating defect consisting of the flame
weight fluctuation is caused by disproportionate amount of coating
transferring from the application roll.
|A stain that occurs in the rinse tanks when the line has stopped. It |
appears blue, green, or black.
|Coil that has a collapsed center.|
|The absence of any gap or clearance when a strip is placed, without |
applying any pressure, between two parallel-faced plates. Wherever a gap
exists under this condition, the strip is "unflat". There are two kinds of
"unflatness" - thickness non-uniformity (such as frown, profile, etc.) and
geometric non-uniformity called shape defects such as (wavy strip, bent
strip, coil set, center buckle, etc.).
|The sudden yielding, with simultaneous appearance of stretcher strain |
markings, taking place in hot-rolled or annealed sheet or strips when
|Flat Rolled Steel|
|Steel produced on rolling mills utilizing relatively smooth, cylindrical |
rolls. The width to thickness ratio of flat rolled products is usually
fairly large. Examples of flat rolled steel are hot-rolled, cold-rolled,
and coated sheets and coils, tin mill products, etc.
|The quality or state of a material that alloys it to be flexed or bent |
repeatedly without undergoing fracture.
|Float and Sink Test|
|The cleaning qualities of a particular coal are determined by this test, |
also commonly known as a washability test. This test effects a
fractionation of coal by size and specific gravity. The test consists in
crushing coal to proper size and floating individual sizes of it on liquids
having densities of 1.30. 1.40. 1.50. 1.60 etc., to determine the weight
and character of the material that floats and sinks n each liquid. The
proportion of coal, and the ash and sulphur content of the different
fractions, provides reasonably complete data on the washability
characteristic of a tested coal. Extreme fines may be evaluated by froth
|A coating defect consisting of the formation of clusters of particles |
separable by relatively weak mechanical forces, or by a change in the
physical forces at the interface between the liquid and the dispersed
|Naturally occurring calcium flouride (CaF2) used as a flux in basic steel |
|Texture showing the direction of metal flow during hot or cold working. |
Flow lines often can be revealed by etching the surface or a section of a
|A coating defect consisting of the poor flow out of the coating on the |
substrate causing a ribbed (ribbing) or ridged appearance.
|The slag which is deliberately taken-out or comes out due to controlled |
boil from any steel making furnace.
|1. Visible line markings that sometimes appear on the surface of flat |
rolled products during forming; associated with non-uniform yielding of the
metal; occurs when the steel is formed into cylindrical or arc shaped
2. The kinking, or breaking of a sheet generally caused by curing the sheet
on two small a diameter. Fluting, or paneling as it is often called, can be
avoided by working the steel before bending. Steel with a definite yield
point (a visible break in the stress-strain curve) will generally tend to
|An iron cleaning agent. Materials such as limestone, lime, flourspar etc. |
react with impurities within the metallic pool to form a slag that floats
to the top of the relatively heavier (and now more pure) liquid iron.
|Footage of Coil|
|The length of the steel strip that makes up a coil.|
|The section of the works used to produce wrought iron blooms, slabs or bars |
for subsequent reheating and re-rolling.
|Ability to undergo plastic deformation by forging.|
|An article produced by hot working the metal under a hammer or press. It |
may also refer to the process followed in producing the article.
|Pig iron suitable for conversion to wrought iron in the puddling furnace.|
|The ease with which a metal can be shaped through plastic deformation. The |
evaluation of the formability of a metal involves measurement of strength
and ductility, as well as the amount of deformation required to cause
fracture. Workability is used interchangeably with formability; however,
formability refers to the shaping of sheet metal, while workability refers
to shaping materials by bulk deformation (i.e. forging or rolling).
|Rough shaping the stock into use preparatory to the final forging |
|A rough edge along the flash line after clipping.|
|Fractional Distillation Process (of Air)|
|The air is first compressed to an elevated pressure, followed by |
progressively cooling it to saturation temperature in steps in a series of
highly efficient heat exchangers. Condensation and freezing out of
moisture, carbon dioxide and hydrocarbons take place as the temperature is
lowered, after which hydrocarbons still remaining are removed in adsorbent
traps. The cold, purified air is finally separated into its constituents in
fractionating (distillation) columns. The requirements for heat removal by
refrigeration at the low temperature level are met by expansion of a
portion of the cold compressed air in an expansion turbine.
|The part of the total carbon content in steel or cast iron present in |
elemental form as graphite.
|The inside lap of the produced coil, or the outside lap of the consumed |
|Hydrocarbon fuels are injected into the blast furnace through the tuyeres |
to control the flame temperature, increase the reducing power of the bosh
gas and at the same time, replace some of the coke. In the presence of
large quantities of coke, the hydrocarbon fuels can burn only to carbon
monoxide and hydrogen; consequently, they produce less heat than the coke
they replace so that they control the flame temperature, but the reducing
gas they produce is more effective than that produced by combustion of
coke. Many different fuels have been used – natural gas, coke oven gas,
oil, tar and pulverized coke, even slurries of coal in oil.
|That part of the die used to reduce a portion of the stock to the |
appropriate form of the forging
|This consists of heating the steel to a temperature above the |
transformation range, holding for one or two hours, and then cooling at a
predetermined rate to obtain the desired microstructure. This process is
used when it is desired to refine the grain structure and produce a
|Full Hard Cold Rolled|
|Hot rolled pickled steel that is cold reduced to a specified thickness and |
subject to no further processing (not annealed or temper rolled). The
product is very stiff; it is intended for flat work where deformation is
|Full Hard Temper|
|Full Hard Cold Rolled steel produced to a Rockwell hardness of 84 and |
higher on the B scale.
|Cold rolled coils coming from the Strip Steel that have not been annealed.|
|Strip in which the edges are shorter than the middle, thus causing |
distortion of the cross section.
|Curtailing the operation of blast furnace by reducing the quantity of wind |
being blown (to less than 20-25% of normal). This is done when the full
productive capacity of the furnace is not required for a period of time.
This technique is used for emergency situations or short periods only (for
a few hours at a stretch).
|The second-largest class of stainless steel, constituting approximately 25% |
of stainless production. Ferritic stainless steels are plain chromium
steels with no significant nickel content; the lack of nickel results in
lower corrosion resistance than the austenitics (chromium-nickel stainless
steels). Ferritics are best suited for general and high-temperature
corrosion applications rather than services requiring high strength. They
are used in automotive trim and exhaust systems, interior architectural
trim, and hot water tanks. Two of the most common grades are type 430
(general-purpose grade for many applications, including decorative ones)
and type 409 (low-cost grade well suited to withstanding high
|An alloy of iron and chromium with up to 72% chromium. Ferrochrome is |
commonly used as a raw material in the making of stainless steel.