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Typically, a crucible is defined as a container in which metals are melted, usually at temperatures above 550 ° C. These are typically graphite crucibles with clay as a binder material. These temperatures crucibles are extremely durable and resistant to more than 1650 ° C. A crucible is placed in an oven and, after the merger, the liquid metal is removed from the oven and slowly pour into the mold. Some old cast iron steel (usually electrically powered) had built a melting pot and leans the metal was poured.
Crucibles are also pots call, and is used for melting small quantities of different materials, but on primarily for the manufacture of crucible steel in general, title = "http://www.youtube.com/watch?v=wdikZ-Th5Hw" target = "_blank"> href = "http://www.youtube.com/watch?v=wdikZ-Th5Hw"> http://www.youtube.com/watch?v=wdikZ-Th5Hw. crucibles for this industry are high as mud mixed with a little coke breeze (crucible or pot of white clay), or a mixture of clay and graphite (graphite, Plumbago, or Blackle crucible).
Graphite Crucibles can be made to contain a heavier burden, and also last a greater number of heats. They are made from a blend of Ceylon graphite, clay and German pure sand, the final composition is about: The clay is dried, ground to a paste with water and sand and graphite well mixed, after the dough is allowed to stay for a few days in a wet season or character, that is, be better able to work. The amount of crucible material is prepared at the same time a lot. A package of appropriate size is cut, knead a little to ensure uniformity, and put into a mold that is placed on a potter's wheel, and the mass turned up (spinning wheel) to fill the mold. The proper thickness of the wall is obtained by means of an arm or iron profile and shape that descends into the crucible. The excess at the top the mold is cut and removed from the mold. Turning gives better results than the simple pressure because it makes the scales or plates (which occurs naturally as graphite) to take a leadership tangential and assemble, thus binding the material.
Artificial graphite is rarely used because it does not occur in these plates. The crucibles are dried, first for about 24 hours, about 20 ° to 25 ° C (70 ° to 80 ° F.), after which they are softened up, and after three weeks at a temperature sufficiently high to remove moisture hygroscopic. It is then heated (annealed or burned) in an oven (annealing oven) for about three days at a temperature of about 825 ° C. (2500 ° F) to remove all water combined. The crucibles are piled in a number of levels, and, as they are still very tender, which are placed in mold assembly loose clay (seggars or saggars), which prevent them from being crushed, and also avoid excessive oxidation. When a melting pot of different sizes are usually made are nested, ie, the smaller ones are placed inside the larger. The slight oxidation of carbon to the surface, which always occurs, gives the crucibles, which Originally black, brown (the color of the clay). The covers are made and treated in a similar manner.
Clay pots, mainly in England, and manufactured with a high degree of fireclay (Burton, Stourbridge, etc.), usually mixed with 5% of coke of good land. The mixture is made with great care, often mass by stepping barefoot on the floor stepping. A mass is placed in a flask or mold, and a plunger in the shape of the interior is forced downward by a pin centers passing through a hole in the bottom. The flask is removed and the upper bound into the crucible through another conical mold to give it a shape like a barrel. After drying for a few days at the boat house (where they do), the crucibles were further dried at a temperature somewhat higher near the chimneys of the furnaces merger. The hole left at the bottom is closed when the crucible is set in the oven for use by throwing a little sand to support the crucible clay chips on which it rests.
These processes have been used in the United States since before the Second World War. The modern general steel making processes is highly computerized and fields an army of robotic machines.
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Sarah Martin is a freelance marketing writer based out of San Diego, CA. She specializes in business, manufacturing, construction, and
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Article Source: ArticlesBase.com – Crucibles in the General Steel Making Process
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