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Metal Casting Technologies : March 2010
28 www.metals.rala.com.au TECHNICAL FEATURE Introduction aterials play an important part in the progress of our society. Among all the materials, steel is the most commercially used material because of its easy availability and lower cost. The demand for steels having good strength is on the increase with many new applications, especially in the aerospace, nuclear, defense, transportation and power generation industries. Recycling of metals and alloys is important for the conservation of natural mineral resources, reduction in energy consumption and reducing the environmental pollution. With the global warming problem getting serious the carbon dioxide emissions must be reduced to a great extent. Every 1% of energy should be saved by each individual. Metal chips in tons are generated during the machining of steels worldwide. The steel chips can be reused for steel making again. Melting in air induction furnaces is difficult because of the low bulk density and surface oxidation of the scrap1. Production of metals from scrap requires much less energy as compared to production from their ores. For instance, one ton of crude steel produced by blast furnace/basic oxygen furnace route using 25% scrap requires about 16 GJ as compared to 100% scrap fed electric arc furnace which needs 8.5 GJ per ton of crude steel2. Ladle refined steels are either continuously or conventionally cast and the products are associated with casting defects such as macro and micro segregation, shrinkage cavity and porosity and large inclusions that originate from refractory lining of the Preparation of quality steels from scrap chips through electroslag remelting M Amit Joshi Dept. of Metallurgical Engineering & Materials Science, Indian Institute of Technology -- Bombay, India. Email: firstname.lastname@example.org, email@example.com RECYCLING OF METALS AND ALLOYS IS IMPORTANT FOR THE CONSERVATION OF NATURAL MINERAL RESOURCES, REDUCTION IN ENERGY CONSUMPTION AND REDUCING THE ENVIRONMENTAL POLLUTION Fig. 1
Media Kit 2010