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Although this article started with a general overview of the iron and steel industry, we will refer only to one process for the rest of this feature, a gray iron foundry using an electric arc furnace. We will see how important brick and refractory are and why everyone should pay attention to their brick and refractory designs and installations.History and Background of the Electric Arc FurnaceThe electric arc furnace (EAF) has been around since the early 1900s and is primarily used to produce high quality alloy steels. EAFs have refractory-lined steel shells and vary ill size from only a few feet in diameter to twenty feet or more. The bottom, or hearth, of the furnace is dished to hold the metal charge. The vertical side walls include one or more doors and a tapping spout for removing the melted charge. The roof over the furnace is dome-shaped, and incorporates two or three cpairhammers openings near its center for the admission of electrodes into the furnace. The roof is usually detachable and is lifted off or turned aside for charging. The whole furnace structure is tilted forward and backward for slag skimming or tapping. The furnace capacity will depend upon the size of the furnace and can be less then one ton per charge to up to eighty-five tons per charge.

The first step in assuring proper installation, after proper material selection, is mixing the refractory. However, in order in to properly mix it you must know how you intend to install it. There are four fundamentally different ways to install refractories:* The gunning method cpairhammers permits the handling of a large volume of materials. Water is added at the discharge nozzle or back at the charging chamber. The amount of water is determined at the point of installation by the nozzle man and also by the characteristics of the refractory. Forms are not required. The advantages, of course, are speed and versatility. Rebound losses mean that more material will be needed than for casting. Overage will vary considerably depending on whether a ceiling, a wall or a floor is being installed.

Jamerco of City of Industry Calif., introduces its new Air Palm-Hammer. The palm-sized pneumatic tool has an operating pressure-range of 50-120 PSI and a consumption of 2-4 CFM. It drives a variety of nails and spikes. Operation is triggerless and is performed cpairhammers by pressing cpairhammers the loaded nailer down over the target. The kit includes a standard common nail attachment, a magnetic tip attachment which holds nails in place, cpairhammers a finish nail attachment, a hammer attachment and a complete maintenance kit. A leather glove is also included. In the production of pig iron, brick and refractory materials are used to form the very large ovens or retorts (coke ovens) in which coal is converted to coke. Refractory and brick materials are needed to line huge shaft-like blast furnaces in which the molten pig is formed. The auxiliary furnaces or hot blast stoves, which heat the air for the blast furnace, are also lined with refractories. The molten pig iron from the blast furnace is then sent to a brick- or refractory-lined ladle. The molten pig iron is then poured into a brick- or refractory-fined pig casting machine, where the pig iron is formed into large castings and cooled.

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