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G
G Coatings
See Galvanize Coatings
Galfan (or Weirkote Plus)
A galvanized product coated with
95% free zinc, 5% aluminum and traces of mish metal in the coating;
provides extra corrosion protection with lighter coating weight; has
improved formability over regular free zinc coatings (hot dipped
galvanized regular products).
Galvaneal Coating (A)
Coatings on hot-dipped galvanized
steels processed to convert the coating completely to zinc-iron alloys;
dull gray in appearance, have no spangle, and after proper preparation,
are well suited for painting.
Galvanize Coatings (G)
Free zinc coatings applied to a hot rolled or cold
rolled steel to produce Galvanized steel. The coating can be applied by
the hot-dip or electrodeposition process.
Galvanize
A sheet product substrate to which
free zinc is applied either by hot-dipping or electro-plating.
Galvanizing Pot
Holds the molten free zinc
coatings applied to a hot rolled or cold rolled steel to produce Hot-dip
Galvanized steel.
Galvanizing
Coating steel with a thin layer of
zinc to increase its corrosion resistance. Most galvanizing is done on a
hot-dip operation, but electrogalvalizing is becoming more important
today. Electrogalvanizing is a cold-coating electroplating process that,
unlike the hot-dip process, does not influence the mechanical properties
of the sheet steel. Electrogalvanizing provides a more uniform coating.
Galvannealed
An extra tight coat of galvanizing
metal (zinc) applied to a soft steel sheet, after which the sheet is
passed through an oven at about 1200 degrees F. The resulting coat is
dull gray without spangle especially suited for subsequent painting.
Gauge Code
Industry-standard code that indicates quality
tolerance of the thickness of the steel.
Gauge Tolerance
A range by which a product’s gauge
can deviate from those ordered and still meet the order’s requirements.
Gauge
1.
An instrument that measures
pressure, temperature, level or flow depending on the purpose. 2.
The thickness of the steel strip.
Gel Spotting
A coating defect consisting of the
uniform circular spots or droplets of higher film thickness on the
coated sheet. Gel spotting, while appearing similar to slinging, is much
more uniform in appearance and caused by a different mechanism. Gel
spotting occurs when a partially gelled coating is applied to the
substrate.
Geometric Marking
Unusual design put on one side (lite
coating) of a coil to identify a different coating weight.
Ghosting
A coating defect consisting of an image on the
freshly coated plate giving the appearance of the substrate being bent
or darker in color.
Gouges
A gross type of scratch.
Grade
The term grade designates
divisions within different types based on carbon content or mechanical
properties; for example, "This is a high tensile (grade) structural
steel."
Grain Structure
Microstructure consisting of
grains (crystals) and phases in metals; generally requires examination
under a microscope of an etched, polished specimen for observation.
Grit
1.
Texture of the surface of a
roll; applied through sand-blasting and grinding; the lower the number,
the higher the grit and the rougher the surface; 50, 90, 150, 200, and
220 grit. Temper Mills may run grit. Grit also refers to the finish on
the surface of the steel. 2. The size of the shot blast used to
mechanically texture a roll for producing a grit finish product.
Ground Roll Finish
The bright or smooth microfinish
on the last stand of a tandem mill or temper mill; produced by grinding;
determines the surface finish of the product where brightness is
desired. |
