MTI ENGINEERING CORPORATION
Precision Sheet Metal Fabrication
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Terminology


Metal Terminology
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GAGES

(Metal) - Mfrs. standard numbering systems indicating decimal thickness or diameters.


GALLING

The damaging of one or both metallic surfaces by removal of particles from localized areas due to seizure curing sliding friction.


GALVANIZING

Coating steel with zinc and tin (principally zinc) for rustproofing purposes. Formerly for the purpose of galvanizing, cut length steel sheets were passed singly through a bath of the molten metal. Today’s galvanizing processing method consists of uncoiling and passing the continuous length of successive coils either through a molten bath of the metal termed Hot Dipped Galvanizing or by continuously zinc coating the uncoiled sheet electrolytically - termed Electro-Galvanizing.


GAMMA IRON

The form of iron stable between 1670°F., and characterized by a face-centered cubic crystal structure.


GILDING METAL

A copper-zinc alloy containing 95% copper and 5% zinc. While similar to deoxidized copper in physical properties, it is somewhat stronger and very ductile. It has thermal and electrical conductivity slightly better than half that of electrolytic copper and corrosion resistance comparable to copper.


GRAIN

A solid polyhedral (or many sided crystal) consisting of groups of atoms bound together in a regular geometric pattern. In mill practice grains are usually studied only as they appear in one plane. (1) Direction of: Refers to grain fiber following the direction of rolling and parallel to edges of strip or sheets. (2) To bend across the grain is to bend at right angles to the direction of rolling. (3) To bend with the grain is to bend parallel to the direction of rolling. In steel, the ductility in the direction of rolling is almost twice that at right angles to the direction of rolling.


GRAIN BOUNDARY

Bounding surface between crystals. When alloys yield new phases (as in cooling), grain boundaries are the preferred location for the appearance of the new phase. Certain deteriorations, such as season cracking and caustic embrittlement, occur almost exclusively at grain boundaries.


GRAIN GROWTH

An increase in metallic crystal size as annealing temperature is raised; growth occurs by invasion of crystal areas by other crystals.


GRAINS

Individual crystals in metals.


GRAIN SIZE

Average diameter of grains in the metal under consideration, or alternatively, the number of grains per unit area. Since increase in grain size is paralleled by lower ductility and impact resistance, the question of general grain size is of great significance. The addition of certain metals affects grain size, for example vanadium and aluminum tend to give steel a fine grain. The ASTM has set up a grain size standard for steels, and the McQuaid-Ehn Test has been developed as a method of measurement.


GRANULATED

A coarse grain or pebbly surface condition which becomes evident during drawing. (See Orange Peel)


GRANULATION

The formation of grains immediately upon solidification.


GRAPHITIZING

A heating and cooling process by which the combined carbon in cast iron or steel is transformed, wholly or partly, to graphitic or free carbon.


GROUND FLAT STOCK

Annealed and preground (to close tolerances) tool steel flats in standard sizes ready for tool room use. These are three common grades; water hardening, oil hardening and air hardening quality.


GUIDE

Device for holding the metal in the proper position, during rolling, or slitting.


GUIDE SCRATCH

(Defect) - Scratches or marks appearing parallel to edges of cold rolled strip caused by scale or other articles which have become imbedded in or have adhered to the rolling mill guide. Also applies to similar scratches appearing as a result of slitting.


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MTI ENGINEERING CORPORATION
Precision Sheet Metal Fabrication
15678 Graham St. Huntington Beach, CA 92649
Telephone: (714) 891-4619
Marc Grismer Ext 105
Fax: (714) 891-7570
Web Site: http://www.mtiengineering.com
E-Mail: sheetmetal@mtiengineering.com


Copyright 1998 MTI Engineering Corporation. All rights reserved.
Last modified on March 15, 2007

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