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LADLE ANALYSIS

A term applied to the chemical analysis representative or in layers, as reported by the producer. Results are determined by analyzing a test ingot sample obtained during the pouring of the steel from a ladle.


LAMINATIONS

A defect appearing in sheets or strips as a segregation or in layers. To become divided, caused by gas pockets in the ingot. (See Cold Shut)


LAP

A surface defect appearing as a seam, caused by folding over hot metal, fins or sharp corners and then rolling or forging them into the surface but not welding them.


LAP-WELD

A term applied to a weld formed by lapping two pieces of metal and then pressing or hammering, and applied particularly to the longitudinal joint produced by a welding process for tubes or pipe, in which the edges of the skelp are beveled or scarfed so that when they are overlapped they can be welded together.


LATTICE

Space lattice. Lattice lines and lattice planes are lines and planes chosen so as to pass through collinear lattice points, and noncollinear lattice points, respectively.


LEAD ANNEALING

(See Bath Annealing)


LEVELING

Flattening rolled metal sheet or strip. (See Roller and Stretcher Leveling)


LIGHT METALS

Metals and alloys that have a low specific gravity, such as beryllium, magnesium and aluminum.


LITHOGRAPHIC SHEET ALUMINUM

Sheet having a superior surface on one side with respect to freedom from surface imperfections and supplied with a maximum degree of flatness, for use as a plate in offset printing.


LONG TERNE

A term applying to steel sheets that have been terne coated (Lead and Tin) by immersion in a bath of Terne Metal. (See Terne Plate)


LOW BRASS - 80% cu.

A copper-zinc alloy containing 20% zinc. Is a light golden color, very ductile, suitable for cupping, drawing, forming, etc. Because of its good strength and corrosion resistance it is used for flexible metal hoses, metal bellows, etc.


LOW CARBON STEELS

Contain from 0.10 to 0.30% carbon and less than 0.60% manganese. ( The product of Basic Oxygen, Bessemer, Open Hearth or Electric Processes.)


LUDERS LINES

(Steel) - Characteristic of No. 5 Temper - Not a defect in No. 5 dead soft temper. Long vein-like marks appearing on the surface of certain metals, in the direction of the maximum shear stress, when the metal is subjected to deformation beyond the yield point. Also called stretcher strains, similar occurrence in certain aluminum alloys, etc. (See Stretcher Strains)


LUSTER FINISH

Refer to FINISHES.




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