Abstract
Metal sludge generated by polishing stainless steel was consolidated by hot rolling. The sample consolidated at 900°C and 1100°C shows a bcc and fcc structure, respectively, and consists of fine grains with grain size of 5 to 10μm. The density increases with increasing reduction and temperature of rolling, and reaches 7.7Mg/m3 for the sample consolidated at 1100°C and a reduction of 80%. On the other hand, a highest hardness of 435HV is obtained for the sample at 1000°C and a reduction of 80%, and a further increase in rolling temperature causes a slight decrease in hardness due to the phase transformation into fcc. It is found that the consolidated sample have hardness superior to the sample produced by melting the sludge. The tensile strength of 1050MPa and elongation of 7% is obtained for the sample at 1100 and a reduction of 80%. It is said that the metal sludge consolidated by hot-rolling have a fine structure and high strength. The powder metallurgical method is thought to be useful for the reclamation of the metal sludge.
