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Steel Industry Glossary


A Coatings
See Galvanneal Coatings.

A. G. C. System
(Automatic Gauge Control) Hydraulic or electric system that supplies the force to the A.G.C. roll force cylinders.

Acetyl Tributyl Citrate
One of the lubricating oils generally applied on tin Mill Products (tin plate, TFS-chrome/chrome oxide coated steel, and blackplate).

Actual Weight
Also the scale weight. The customer buys by the actual (scale) weight of the steel. The theoretical weight is used in estimating, however, it is not to be used for billing.

Age Hardening
A process of aging that increases hardness and strength and ordinarily decreases ductility. Age hardening usually follows rapid cooling or cold working. Takes effect on all cold rolled sheets in storage except fully aluminum killed.

A change in the properties of certain metal and alloys (such as steel) that occurs at ambient or moderately elevated temperatures after a hot working heat treatment or cold working operation. Typical properties impacted are: hardness, yield strength, tensile strength, ductility, impact value, formability, magnetic properties, etc. See also Non-aging.

See American Iron and Steel Institute.

A type of resin made from a polyhydroxy alcohol combined chemically with the acids of various oils. They are particularly adapted for use where hardness and high gloss are required. Used largely for outside decoration.

Aluminum Killed Steel (Special Killed)
Steel deoxidized with aluminum in order to reduce the oxygen content to a minimum so that no reaction occurs between carbon and oxygen during solidification.

American Iron and Steel Institute (AISI)
A non-profit association of North American producers, suppliers to and users of steel. It's mission is to promote steel as the material of choice and to enhance the competitiveness of its members and the North American steel industry.

A process, consisting of heating to and holding at a suitable temperature followed by cooling at a suitable rate, used primarily to soften metallic materials, such as steel. This process also simultaneously produces desired changes in microstructure, as in other properties, such as improvement of mechanical or electrical properties, increase in stability in dimensions, facilitation of cold work, etc. Also see Continuous Anneal and Batch Anneal.

1. Heating and then cooling metals in a controlled atmosphere to soften them. 2. A process involving heating and cooling usually applied to induce softening. In box annealing, the material to be annealed is enclosed in a metal container with, or without packing material to minimize oxidation. The charge is usually heated slowly to a temperature just below the transformation range, but sometimes just above, or within it, and cooled slowly.

Tin bars that are put in the plater cells and are important to the plating process in the Tin Mill.

American Standard of Testing and Materials. A non-profit organization that provides a forum for producers, users, ultimate consumers, and those having a general interest (representatives of government and academia) to meet on common ground and write standards for materials, products, systems, and services.

ASTM Standards
A series of documents, approved and published by ASTM, that include specifications or requirements, practices, guides, test methods, etc., covering various materials, products, systems or services. In the steel industry, the steel related ASTM standards are used by both the producers and users to ensure that a steel product or service meets all intended requirements. See American Society for Testing and Materials.

See Acetyl Tributyl Citrate.

Atmosphere Valve
A valve that is located in the exhaust line of a turbine and is designed to open up and get a positive pressure in the exhaust line.

Atomizing Steam
Low pressure steam which is introduced to the oil gun to help atomize the oil, to assist the burning process, and to keep the oil gun from plugging.

Header connecting the primary and finishing superheaters into which feed water is sprayed to control the final temperature of the steam leaving the boiler.

Describes the status of the operation when the O2 pulpit has control and the boiler logic has control.

Auxiliary Air
A controller for auxiliary air dampers on #146 and #147 boilers. For proper combustion on oil fire.

Auxiliary Hydraulic System
Hydraulic system that supplies the force to run the various hydraulic cylinders associated with the finishing mill which are not taken care of by the A.G.C. or C.V.C. Hydraulic systems.

Auxiliary Oil Pump
A steam or electric pump that maintains oil pressure on the controls and the bearings of a turbo blower when it is not up to maximum speed.

Auxiliary Pump
Pump on the auxiliary system which supplies the pressure for the system.

AW - 100
The hydraulic oil used in all the hydraulic systems located in the finishing mill oil cellar and the furnace hydraulic system.


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