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Effects of high temperature sintering on mechanical properties of sintered low alloy steels were investigated. With regard to sintering temperature dependence of mechanical properties, as-sintered steels are classified into two groups. High temperature sintering increased strength of the group1 steels and ductility of the group2 steels, while it did not affect ductility of the group1 steels and strength of the group2 steels. When these steels were heat treated after sintering, both strength and ductility of the steels obtained by high temperature sintering were superior to those of the steels of a conventional sintering process.