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Most pig iron from the blast furnace is used to make steel. To do this, pig iron--usually molten--is combined with molten steel scrap in open hearth furnaces, or in Bessemer converters, to be refined and purified. Regardless of process, the refined ingersollrandsuper-dutyairhammerwithextra-sensitiveteasethrottlemodel132 and purified molten steel is poured into ladles, made into ingots, put into a soaking pit, sent to roughing mills, passed through a reheating furnace, and finally sent to the ingersollrandsuper-dutyairhammerwithextra-sensitiveteasethrottlemodel132 finishing mills. Almost regardless of where you look, you will find brick and refractory.

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, ingersollrandsuper-dutyairhammerwithextra-sensitiveteasethrottlemodel132 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 ingersollrandsuper-dutyairhammerwithextra-sensitiveteasethrottlemodel132 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 ingersollrandsuper-dutyairhammerwithextra-sensitiveteasethrottlemodel132 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 ingersollrandsuper-dutyairhammerwithextra-sensitiveteasethrottlemodel132 a tapping spout for removing the melted charge. The roof over the furnace is dome-shaped, and incorporates two or three 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.

There are two types of electric arc furnaces, acid or basic, which refer to the type of slag present in the furnace. Both types are lined with a combination of brick and refractory. Practically every advance in foundry melt shop practices has put greater demands on the brick ingersollrandsuper-dutyairhammerwithextra-sensitiveteasethrottlemodel132 and refractory used. Higher operating temperatures and other desirable conditions, which are increasingly destructive to refractory materials, ingersollrandsuper-dutyairhammerwithextra-sensitiveteasethrottlemodel132 are called for by the plant operators. Over the past ten to fifteen years, a lot of expertise in the iron and steel foundry has been lost. Therefore, it would serve the industry well if some fundamentals of brick and refractory applications are reviewed here.

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