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Accurate cast steel can obtain well and truly appearance and taller cast precision. Alleged and accurate foundry technology, say simply even if make model of Cheng Kerong with Yi Rong material, on its Tu Fure does a tailor-made fireproof painting, the course is dry after forming a whole hard surface with sclerosis, reoccupy vapour or hot water from model the frit in housing drops a model, next model in housing park sandbox, in its all around fill does arenaceous model, put casting mould into roast furnace to pass high temperature roast finally, casting mould or model after housing classics roast, at among them pouring melt metal and receive cast.