Steel Industry Glossary
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.
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