Scholarly record
RETUNABLE AND NON-RETUNABLE LOSSES FROM FOUNDRY PROCESS AND INFLUENCE OF CHARGE MATERIAL ON MECHANICAL PROPERTIES OF CAST IRON
Abstract
Returnable and non-returnable losses rise during melting and casting of molten metal. Non – returnable losses arise by melting and metallurgical treatment of molten metal as a back wash of evaporation, chemical reactions between molten metal and refractory lining, molten metal and air and between molten metal and refining additions. Value of these losses depends on the kind of alloy, on used furnace and charge quality. Except non-returnable losses, the returnable losses creates by melting. They represent a difference between molten metal from melting and weight of castings. Into the group of returnable losses belongs damage castings, gating systems, risers and splashes. Splashes create after melting by pouring molten metal from furnace into ladle, by transport of molten metal and by pouring of molten metal from the ladle into the mould. The splashes were divided in to three groups. They were cleaned and used into a charge. The metal casting industry is the “original recycler”. Annually, foundries consume 15 – 20 million tons of recycled scrap metal. The use of steel scrap in the production of cast iron has a large role in economic production but also ecology of foundry. The portion of steel scrap in the charge represents around 30\%. Production of cast iron with a higher content of steel scrap resulting in a metallurgical treatment of the melt. The higher share of scrap produced no imply worse quality of cast iron, it is also possible to make synthetic cast iron with 100\% scrap steel with quality requirements prescribed by the standard. By experimental melts the influence of quantity and quality of splashes on quality of cast iron was observed and results of research works of influence of raw materials on mechanical and qualitative properties of cast iron with lamellar graphite made from different percentage of raw materials in foundry was determine.
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References4
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